Pulse or digital communications inventions 08/06

20060193371 - Synchronization and channel estimation with sub-nyquist sampling in ultra-wideband communication systems: The system and method for estimating impulse response of a wideband communication channel represented as linear combination of L time-shifted pulsed P1(t) with propagation coefficients a1, comprising functionalities or steps for obtaining an ultrawideband signal (y(t) of FIG. 1) received over the channel, filtered (h(1) of FIG. 1) with low...

20060193372 - System and method for generating shaped ultrawide bandwidth wavelets: An ultra-wide band (UWB) waveform generator and encoder for use in a UWB digital communication system. The UWB waveform is made up of a sequence of shaped wavelets. The waveform generator produces multi-amplitude, multi-phase wavelets that are time-constrained, zero mean, and can be orthogonal in phase, yet still have a...

20060193373 - Highly bandwidth-efficient communications: A discrete multitone stacked-carrier spread spectrum communication method is based on frequency domain spreading including multiplication of a baseband signal by a set of superimposed, or stacked, complex sinusoid carrier waves. In a preferred embodiment, the spreading involves energizing the bins of a large Fast Fourier transform (FFT). This provides...

20060193374 - System, apparatus, and method for adaptive weighted interference cancellation using parallel residue compensation: A system, apparatus and method for a multi-stage Parallel Residue Compensation (PRC) receiver for enhanced suppression of the Multiple Access Interference (MAI) in Code Division Multiple Access (CDMA) systems. The accuracy of the interference estimation is improved with a set of weights computed from an adaptive Normalized Least Mean Square...

20060193376 - Highly integrated asymmetric digital subscriber line (adsl) circuit: An ADSL transceiver chip is provided that includes an analog front-end and a digital signal processor (DSP) integrated on the same substrate. A line driver for the ADSL transceiver can be located on a separate substrate. In embodiments of the invention, the transceiver chip is implemented in a CMOS process....

20060193375 - Transceiver for zigbee and bluetooth communications: The invention provides a transceiver for Zigbee and Bluetooth communications integrating a Zigbee transceiver and a Bluetooth transceiver. The transceiver includes an RF processor 110, a variable bandpass filter 120, an FSK modulator/demodulator 130, a memory 140, a baseband processor 150, a main controller 160, and a channel selection/frequency hopping...

20060193377 - Method for equalization of a data signal taking into account a disturbance channel: A useful channel trellis diagram is processed in a method for equalization of a signal which is transmitted via a useful channel. A disturbance channel trellis diagram is then processed, with useful channel path information being used as a DF contribution. The useful channel trellis diagram is processed once again,...

20060193378 - Processing digital data prior to compression: A method includes receiving an original string of bits where each of the bits represents one of two possible logic levels. The string of bits also carries information. A new string is formed, based on the original string, which contains all of the information of the original string by using...

20060193380 - Managed degradation of a video stream: A system and a method for simultaneous transmission of multiple media streams in a fixed bandwidth network are disclosed herein. The system is comprised of a central gateway media server and a plurality of client receiver units. The input media streams arrive from an external source and are then transmitted...

20060193381 - Moving-image distributing apparatus, moving-image distributing system, and computer product: A moving-image-data acquiring unit acquires, when a failure occurs in other moving-image distributing apparatus, a plurality of moving-image data transmitted from a part of the encoders to the other moving-image distributing apparatus. An imaging-target-information acquiring unit acquires location information of an imaging target from a management server that manages the...

20060193379 - System and method for achieving inter-layer video quality scalability: A system and method for providing quality scalability in a video stream. A bit stream is provided with a video sequence having a base layer and an enhancement layer. The enhancement layer includes a plurality of enhancement layer blocks, each of which includes a block coefficient. Each layer block coefficient...

20060193382 - Method and apparatus for control of rate-distortion tradeoff by mode selection in video encoders: A Method And Apparatus For Control of Rate-Distortion Tradeoff by Mode Selection in Video Encoders is Disclosed. The system of the present invention first selects a distortion value D near a desired distortion value. Next, the system determines a quantizer value Q using the selected distortion value D. The system...

20060193383 - Method of operating a video decoding system: A system and method for decoding a digital video data stream. In one aspect, a plurality of hardware acceleration modules are used together with a core processor. The accelerators operate in a decoding pipeline wherein, in any given stage, each accelerator operates on a particular macroblock of video data. In...

20060193385 - Fast mode-decision encoding for interframes: A video encoder and corresponding methods are provided for selecting the mode of a current macroblock of an inter-coded frame, including one or more of checking first modes for a subset of macroblock modes, selectively checking other modes in response to motion vector information of the checked first modes, and...

20060193384 - Method and apparatus for low-complexity spatial scalable decoding: A video decoder and method for low-complexity spatial scalable video are disclosed, the decoder for receiving compressed high-resolution scalable and standard-resolution bitstreams and providing high-resolution video, and including an I-picture detector for receiving the compressed standard-resolution bitstream, a standard-resolution Intra decoder coupled with the I-picture detector for decoding I-pictures, a...

20060193387 - Extracting key frames from a video sequence: A method of extracting key frames from a video sequence, which video sequence comprises MPEG compressed video data having block motion vectors. The method initially partially decompresses (202) the MPEG compressed video data to obtain block motion vectors and converts (204) the block motion vectors to forward block motion vectors....

20060193388 - Method and apparatus for scalable motion vector coding: A method and apparatus for scalable coding of a motion vector generated during motion estimation, in which a generated motion vector field is separated into a base layer and an enhancement layer according to pixel accuracies to obtain a layered structure for a motion vector. In addition, the motion vector...

20060193386 - Method for fast mode decision of variable block size coding: Methods for fast mode decision of variable size block coding referring to spatial and temporal correlations between a current encoding motion block and at least one reference motion block to decide a best mode for encoding the current encoding motion block. The at least one reference motion block includes at...

20060193389 - Method and device for producing a transmission signal to be transferred over a transmission path: A method and device are provided for producing a transmission signal to be transferred over a transmission path from an input signal, for example an xDSL signal, wherein a bandwidth of the input signal is distributed onto a plurality of frequency bands in such a way that part signals are...

20060193392 - Apparatus for and method of compensation for frequency offset and channel variation in mimo-ofdm receiver: An apparatus for compensating for a frequency offset and a channel variation, includes: a frequency offset compensation unit estimating the frequency offset of receptions signals received via reception ends based on a final metric value of the reception signals, and a compensator compensating for the frequency offset of the receptions...

20060193390 - Methods and apparatuses for canceling correlated noise in a multi-carrier communication system: Embodiments of an apparatus, system, and method are described for a multi-carrier communication system that cancels at least some correlated noise estimated to be present in a channel in the multi-carrier communication system. Values of noise present on at least on reference channel in a multi-channel communication system may be...

20060193393 - Ofdm transmitter: An OFDM transmitter is configured to perform a peak reduction process on a signal sequence to be transmitted in a stepwise manner to transmit a peak processed transmission signal. The OFDM transmitter includes a dividing inverse fast Fourier transform unit (104) configured to divide the signal sequence to be transmitted...

20060193391 - Ordered retransmissions for arq in multicarrier systems: A first data symbol that includes a kth data bit is received over a multicarrier system. A first channel quality parameter is estimated for the first data symbol. A second data symbol that includes a retransmitted kth data bit is received. A second channel quality parameter for the second data...

20060193394 - Receiving method and receiving apparatus: Burst signals are received. An AGC unit determines gain for the received burst signal. A VGA unit amplifies the received burst signal by the determined gain. In the burst signal, Legacy STS is assigned in a header portion and MIMO-STS is assigned posterior to the Legacy STS. The AGC unit...

20060193395 - Combined alignment scrambler function for elastic interface: An interface alignment pattern for de-skewing data bits received on an elastic interface is disclosed. The interface alignment pattern is “busy” in that it has a high number of logic state transitions. The busy interface alignment pattern can be used for scrambling and unscrambling operational data. The interface alignment pattern...

20060193396 - Communication system modulating/demodulating data using antenna patterns and associated methods: A wireless communication system includes a transmitter comprising a serial-to-parallel converter for converting serial data bits to a parallel bit stream, a signal mapper coupled to the serial-to-parallel converter and an antenna selector coupled to the serial-to-parallel converter. The signal mapper receives as input a first group of bits from...

20060193397 - Transmission output control apparatus and its method, transmitter using the same, and recording medium recording transmission output control program: Disclosed is a transmission output control apparatus for controlling transmitter output power to coincide with a first reference value. The apparatus includes an averaging circuit and a control section. The averaging circuit calculates an average value of said detection value of the output power. The control section outputs a differential...

20060193398 - Data retransmission method employing symbol rearrangement over the galois field: A method for transmitting data from a transmitter to a receiver of an ARQ communication system comprising the step of encoding data received from a signal source using a forward error correction (FEC) code to generate Galois field (GF) symbols. Further, it comprises the steps of mapping the GF symbols...

20060193399 - Optical communication device: An optical sender is disclosed that operates in a Differential Quadrature Phase Shift Keying modulation scheme for high speed optical transmission and is capable of performing logical calculations at a low speed. The optical sender transmits a Differential Quadrature Phase Shift Keying (DQPSK) signal generated with modulation signals ρk and...

20060193400 - System and method for estimating probabilities of events: A dual adaptive importance-sampling system and method is provided that can estimate the probability of events by combining dual complementary importance-sampling simulations. The present invention exploits the ability to determine an optimal biased pdf using an iterative procedure that requires relatively little a priori knowledge of how to bias. Hence,...

20060193401 - System for coherent demodulation of binary phase shift keying signals (bpsk): where α and k are parameters that depend on the type of predominant non-linearity in the injection locking oscillator (ILO), and Ai is the amplitude of the recovered carrier signal at a frequency of 2f, and means for combining the differential output (Op, On) signals with a copy of the...

20060193402 - Frequency shift keying receiver for minimum shift keying, and a method for setting reference pn sequence for frequency shift keying thereof: The invention relates to an FSK receiver for MSK capable of transmitting an MSK-modulated signal via FSK demodulation, and a method for setting a plurality of reference PN sequences thereof. In the FSK receiver for MSK of the invention, an RF converter converts an MSK-modulated RF signal into an IF...

20060193404 - Cycle-stealing decoding apparatus, systems, and methods: Apparatus and systems, as well as methods and articles, may operate to buffer a state of an iterative decoder operating on a codeword associated with a partially decoded forward error correction-encoded data block, and to restore the state to perform additional decoding iterations on the block during a period when...

20060193403 - Signal processing method and apparatus using bit confidence values: In a UMTS/GSM receiver with EDGE services capability, a data sequence incorporating PSK symbols is separated into bits which are assigned confidence values and input to convoluntional decoder (33) to provide improved decoding....

20060193405 - Recording condition setting device, recording/reproducing device, recording condition setting method, control program, and recording medium: The recording condition setting device according to the present invention includes (i) a specific pattern detection circuit for detecting, as a specific pattern, one or more patterns having been set by recording information, from one or more decoded bit sequences generated from a reproduction signal received from an optical disc,...

20060193406 - Signal quality evaluation device, information read/write device, signal quality evaluation method, write conditions determining method, signal quality evaluation computer program, computer-readable storage medium containing signal quality evaluation compu: A Viterbi decoding circuit performs Viterbi decoding on the basis of a reproduced signal obtained by reading an optical disc. A decoded bit sequence is fed to a first specific pattern detection circuit and a first reverse pattern detection circuit. A path metric difference ΔM is fed to a reproduced...

20060193407 - Method and system using preamble detection to demodulate a phase shift key carrier signal: A method for performing demodulation of a phase shift key carrier signal includes receiving a data stream extracted from the carrier signal, the data stream having a preamble, and detecting the presence of the preamble. A phase/frequency correction is provided if the preamble is detected....

20060193408 - Signal meter for digital systems: A Signal Strength Indicator for Digital Systems is disclosed. The Indicator is based on the output of the correlation operation performed in the synchroniser of a digital receiver. In particular, the correlator output indicating the position and timing of the guard intervals in the digital signal, is used as a...

20060193409 - Method and apparatus for compensation of doppler induced carrier frequency offset in a digital receiver system: Methods and apparatus are provided for compensating for Doppler induced carrier frequency offset in a digital receiver. According to one aspect of the invention, a received signal is digitized and a differential detection algorithm is applied to the digitized received signal to compensate for the Doppler induced carrier frequency offset....

20060193410 - Gain estimation for multiple receiver systems: The present invention provides a method for automated gain control associated with the receipt of multiple input multiple output (MIMO) radio frequency (RF) packet communications. This involves receiving multiple MIMO RF packet communications with multiple receiver pathways, wherein the RF packet communications each comprise a preamble and data. A gain...

20060193411 - Digital receiver method and apparatus using differential detection and equalization-based techniques: Methods and apparatus are provided for processing a signal received on a channel. The intersymbol interference on the channel is initially evaluated and a detection method is selected from a plurality of available detection methods based on the intersymbol interference evaluation. For example, the plurality of available detection methods may...

20060193412 - Communication timing changing method and device: The invention aims at providing communication timing changing method and device which are capable of changing timing of communication for setting control parameters used to determine operations of analog devices in the analog devices, respectively, over to another one not impeding any of the operation of the analog devices. An...

20060193413 - Method of capturing data transferred in synchronization with a data strobe signal and data capture circuit performing same: A method of capturing data that are transferred in synchronization with a data strobe signal. The method includes sampling a data strobe signal at a clock frequency higher than a data rate to detect a transition point of the data strobe signal (e.g., by generating and comparing a plurality of...

20060193414 - Synchronization and data recovery device: A synchronization and data recovery device (SuD) for clock-synchronized recovery of data bits in a data stream is provided, which is particularly suitable for improved backward identification of data in serial receiver interfaces of high-speed semiconductor memory modules and/or memory controller modules with a low data density. The SuD includes...

20060193415 - Apparatus and method for detecting sync signal: An apparatus and a method of detecting a sync signal, the apparatus including a sync determiner selecting an output sync pattern from a candidate sync signal generated by pattern matching in lock and/or unlock modes and selecting one of candidate sync patterns of the candidate sync signal having a cycle...

20060193416 - Data output method, data output apparatus and communication system: A data output apparatus accumulates received sound data in an accumulating unit (jitter buffer), and reproduces sound based on the accumulated sound data. Then, for a predetermined period of time from the time point at which reception of data starts, the data output apparatus restricts or prohibits discarding of data...

20060193419 - Delay-locked loop with dynamically biased charge pump: A delay-locked loop, including a phase detector configured to receive two signals, one of the signals being delayed relative to the other of the signals, the phase detector having an UP output and a DOWN output. The delay-locked loop also includes a charge pump system operatively coupled with the phase...

20060193418 - Method and apparatus for clock recovery: A clock recovery system includes a rough clock generator, which yields a rough clock signal, based upon logic level transitions exhibited by a data signal. The rough clock signal is supplied to a phase locked loop having an adjustable order of frequency response, an adjustable corner frequency, an adjustable natural...

20060193417 - Systems and methods for switching between redundant clock signals: A system for switching between redundant clock signals is provided. The system includes a first clock signal generator configured to generate a first clock signal to provide a primary clock signal, a second clock signal configured to generate a second clock signal to provide a redundant clock signal, and a...

20060188003 - Communication of interference mitigation related information between wireless devices: Transmitting information is disclosed. Interference mitigation information associated with mitigating interference with a victim wireless device is obtained. The interference mitigation information is transmitted....

20060188002 - Method and apparatus for decoding an incident uwb signal with inter symbol interferences: The method is for decoding an incident UWB signal including successive incident pulses respectively received during successive Pulse Repetition Periods, each incident pulse including one transmitted symbol among M possible symbols, and the transmitted symbol being corrupted by Inter Symbol Interferences (ISI). The method includes determining a correlation matrix (Γ),...

20060188001 - Methods and apparatus for reducing discrete power spectral density components of signals transmitted in wideband communications systems: Methods and apparatus for reducing discrete power spectral density (PSD) components of wideband signals transmitting blocks of data are disclosed. Discrete components are reduced by acquiring N symbols of pseudo-random data, each symbol having K bits; selecting one bit from each of the acquired symbols to generate N selected bits;...

20060188004 - Radio communication device and semiconductor integrated circuit device used for the same: A semiconductor integrated circuit for a radio communication terminal sequentially uses a plurality of frequency channels by instructions from a hopping frequency decision unit to receive packet data by a reception unit. When the integrated circuit cannot detect the head of the packet data in reception operations, the integrated circuit...

20060188007 - Generalized rake receiver for wireless communication: The present invention is related to a generalized rake receiver for a wireless communication system. The rake receiver comprises a plurality of finger correlators and a plurality of escort correlators. Each finger correlator demodulates each multipath components of the transmitted signal. The escort correlator is used for multipath tracking for...

20060188006 - Method and apparatus for estimating gain offsets for amplitude-modulated communication signals: A method of processing an amplitude-modulated traffic signal involves the determination of a gain offset between the traffic signal and a reference signal, e.g., a pilot signal, received in association with the traffic signal, based on relating values known or determined from the reference signal to that gain offset. For...

20060188005 - Multi-path searching: A multi-path searcher comprises multiple correlators (Co, C1, C2, C3 . . . CN) which each process a predetermined scrambling sequence and channelisation code to carry out a correlation measurement on a received pilot signal after it has been delayed by a different time delay (D) at the input of...

20060188008 - Scaling using gain factors for use in data detection: Data is estimated from a received vector comprising a plurality of communications. A received wireless signal is converted to a baseband signal, which is sampled to produce a received vector. Channel responses are estimated for the received communications. The noise variance is estimated. The noise variance is scaled by a...

20060188009 - Frame synchronization using soft decisions in a universal mobile telephone system receiver: A Universal Mobile Telephone System (UMTS) receiver performs frame synchronization in accordance with a soft decision technique. Illustratively, the UMTS receiver first forms a matrix of correlation peak values (350) from at least one received frame, each row of the matrix representing a possible SSCH code and each column of...

20060188010 - Wireless communications with transceiver-integrated frequency shift control and power control: Baseband processor and communication overloading can be relieved in a portable wireless communication terminal by decentralizing power control (38, 39) and frequency shift control (75) functions that are conventionally concentrated in the baseband processor. A timing sequencer (31) for power control can be integrated into a transceiver of the portable...

20060188011 - Automated diagnosis and forecasting of service level objective states: Systems, methods, and software used in performing automated diagnosis and identification of or forecasting service level object states. Some embodiments include building classifier models based on collected metric data to detect and forecast service level objective (SLO) violations. Some such systems, methods, and software further include automated detecting and forecasting...

20060188015 - Coding apparatus and method, decoding apparatus and method, image processing system, image processing method, recording medium, and program: An image processing system includes a coding device configured to code input image data, and a decoding device configured to decode the coded input image data, wherein, if coding and decoding are repeated on the input image data, the image quality of an image corresponding to the input image data...

20060188014 - Video coding and adaptation by semantics-driven resolution control for transport and storage: A method and system for modifying the spatial and/or temporal resolution and/or signal to noise ratio of temporal and/or spatial segments of compressed video based on semantic properties of the video content to adapt the compressed video size for transport and storage applications....

20060188016 - Method and apparatus for dynamic determination of frames required to build a complete picture in an mpeg video stream: A method for dynamically determining frames required to build a complete picture in an MPEG video stream includes decoding an order of frames in the MPEG video stream according to a dependency vector model. The dependency vector model is configured for determining a dependency vector as a function of the...

20060188017 - Picture coding method and picture decoding method: A picture coding apparatus (300) is a picture coding apparatus that codes a difference between picture data (Img) representing an input picture and predictive picture data (Pred) representing a predictive picture for the input picture and generates coded picture data, and includes a picture decoding unit (104) for decoding coded...

20060188019 - Method and system for adaptive motion estimation: A method and system for adaptive motion estimation, which sets a search range in a previous frame in order to find a corresponding macroblock in the adaptive search range according to each macroblock of a current frame and to accordingly determine a corresponding motion vector. A motion vector is first...

20060188018 - Method and system for motion estimation using chrominance information: A method and system for motion estimation using chrominance information, which is based on each block of a current frame to find a corresponding block from a previous frame within a search area and accordingly determines a motion vector and includes first separately computing luminance differences and chrominance differences between...

20060188021 - Motion vector detecting device: A motion vector detecting unit 24 detects a motion vector between an input image and a reference image. A reduced image creation unit 40 reads out pixel data of the reference image from the frame memory, and creates a reduced image at a lower resolution than that of the original...

20060188020 - Statistical content block matching scheme for pre-processing in encoding and transcoding: Statistical content block matching for video pre-processing, for example in fast motion estimation, uses a second-order distortion criterion for processing steps such as identifying a best reference image portion for comparison with a current image portion. The second-order distortion criterion is a Lagrange-optimized combination of a mean squared error criterion...

20060188022 - Motion estimation apparatus and method: A motion estimation apparatus and method is disclosed. The apparatus includes a block error calculator to calculate a specified block error based on a candidate motion vector previously estimated and spatiotemporarily neighboring on a present block; a motion estimation mode decider to decide a motion estimation mode for the present...

20060188012 - Data encoding apparatus, data encoding method, data output apparatus, data output method, signal processing system, signal processing apparatus, signal processing method, data decoding apparatus, and data decoding method: This invention relates to an apparatus for encoding data or the like, which disables the data to be copied in a condition where its good quality is maintained without deteriorating a quality of an output owing to the data before being copied. Synchronization signals VD and HD separated from the...

20060188013 - Optical flow estimation method: The optical flow in an image is estimated using only parameters extracted directly from a compressed video data stream, substantially eliminating the need to decode the video data stream for this purpose. Coefficients extracted from the compressed video data stream are used to establish a confidence map indicative of the...

20060188023 - Method of decoding a digital video sequence and related apparatus: A method for decoding a digital video sequence includes decoding a first picture in the sequence; reducing a data size of the decoded first picture by vector quantizing at least one component of the first picture, the quantized component selected from the luminance and chrominance components of the first picture;...

20060188024 - Motion image encoding apparatus, motion image decoding apparatus, motion image encoding method, motion image decoding method, motion image encoding program, and motion image decoding program: A motion image decoding apparatus for generating a prediction signal in blocks is provided with a low-resolution block decoder for generating a low-resolution block with a smaller number of pixels than that of a prediction block by decoding encoded data. The motion image decoding apparatus is further provided with an...

20060188025 - Error concealment: An error concealment in decoding of inter-coded information, comprising normative error concealment within a decoding loop and proprietary error concealment outside the decoding loop. The normative error concealment provides meta-data and a reconstructed frame for the proprietary error concealment. Using these, the proprietary error concealment further enhances the reconstructed frame...

20060188026 - Apparatus and method for synchronizing transport packet in ground wave digital multimedia broadcasting: An apparatus and method for synchronizing a TS packet of a ground wave DMB. The method for synchronizing a TS packet of a ground wave DMB includes deinterleaving and decoding a demodulated TS packet; converting the decoded TS packet formed in a unit of bit into a TS packet formed...

20060188027 - Apparatus and method for reduced sample rate class s rf power amplifier: A Class S RF power amplifier for use in a radio frequency (RF) transmitter. The Class S power amplifier comprises a delta-sigma modulator that receives an analog modulated RF carrier and generates a pulse-width modulated binary signal. The Class S power amplifier also comprises a switch mode power amplifier that...

20060188028 - Analog correlator for very high speed data communication: An analog correlator for very high speed data communication, including a single transmission line receiving an input signal and used as a signal delay circuit, a plurality of analog multipliers connected in parallel with a predetermined gap from the transmission line, for receiving a predetermined size of voltages, respectively, and...

20060188029 - Sensor array with amplitude modulated output signal: A sensing device in the form of a sensing array includes sensing elements on a first integrated circuit and means for processing the signals on a second integrated circuit. The output of the sensing elements is sampled, modulated on to a carrier signal and transferred from the first to second...

20060188030 - System and method for shifting data bits multiple times per clock cycle: A system and method are used to allow for phase rotator control signals to be produced that rotate bits in the signals more than one step per clock cycle. This can be done through the following operation. First and second data signals that include a plurality of data bits are...

20060188032 - Dual carrier modulator for modulating ofdm multi-carrier, ofdm transmitter therewith, and a method thereof: A dual carrier modulator that modulates an orthogonal frequency division multiplexing (OFDM) carrier, includes an input part receiving a predetermined number of coded bits; a memory part storing the coded bits received through the input part; a detection part detecting four bits among the coded bits in a predetermined order;...

20060188031 - Intelligent demodulation systems and methods in an ofdma multicell network: An OFDMA communication system includes a plurality of terminals, with at least one of the terminals including at least one type of multi-user decoder adapted to decode a signal intended for the at least one terminal received on a subchannel of the system and adapted to decode at least a...

20060188035 - Method for seamlessly changing power modes in an adsl system: A DMT system and method with the capability to adapt the system bit rate on-line in a seamless manner. The DMT system provides a robust and fast protocol for completing this seamless rate adaptation. The DMT system also provides a framing and encoding method with reduced overhead compared to conventional...

20060188034 - System and method for multiple signal carrier time domain channel estimation: The present invention provides a method of characterizing a frequency response of a transmission channel between a transceiver and a subscriber unit. The method includes once per predetermined interval of time, the transceiver transmitting a signal including multiple carriers, a plurality of the carriers including training symbols, a plurality of...

20060188033 - Wireless receiver with anti-jamming: An embodiment of the present invention provides a receiver capable of receiving a signal carrying data in the presence of jamming interference, the receiver comprising an anti-jamming (AJ) processor, adapted to process the received signal so as to determine a frequency, phase and amplitude of the jamming interference, a jamming...

20060188036 - Method for transmitting uniformly distributed data in a mimo telecommunication system: sequence allocation ALS for forming groups G1, G2 of Nt permutated bit sequences Psqj intended to be transmitted through Nt channels allocated to a same bit rank for all transmitting antennas. The invention ensures an essentially homogeneous distribution of the encoded data bits over the different channel inputs, and thus...

20060188037 - Data transmission device: A data transmission device is applied to a network apparatus having an automatic crossover function, and is connected to a transmission control unit, such that the transmission control unit detects an operating status of the network apparatus and accordingly generates a control command. Thereby, a current source generating unit provides...

20060188038 - Distortion compensation apparatus: A distortion compensation apparatus is provided to restrain an increased calculation time caused by a large amount of calculation required for obtaining a phase variation amount for compensation from the correlation. The distortion compensation apparatus includes an update calculation section calculating a distortion compensation coefficient by use of an adaptive...

20060188040 - Data channel with sampling rate less than the channel bit rate: Due to code constraints and pickup limitations of optical pickups, much of the signal energy of a binary coded analog signal, and therefore much of the information content, has dissipated at frequencies above about one-half (or even above about one-fourth) of the sampling frequency fs. For example, the response of...

20060188039 - Method and apparatus for performing an n-dimensional gradient search: A method and apparatus is presented for performing an n-dimensional gradient search. A state machine is implemented to manage the initial location of the search, increment a counter used to count a search, generate locations (i.e., settings) of the search and the errors associated with the search. The state machine...

20060188041 - Apparatus and method for estimating transmitted signal: A receiver having a low computation complexity so as to estimate a transmitted includes a likelihood function calculator calculating likelihoods of transmittable signals using a currently received signal, at least one previously received signal, and an estimated signal corresponding to the at least one previously received signal; and a maximum...

20060188042 - Narrowband gain control of receiver with digital post filtering: An Automatic Gain Control (AGC) circuit as used in a digital receiver that utilizes a main loop filter that is of a relatively wide bandwidth. A pre-filter, wideband variance is determined from the input digital signal, and a post-filter, narrowband variance is also determined. The wideband and narrowband variances are...

20060188043 - High-speed signaling systems with adaptable pre-emphasis and equalization: A signaling system includes a pre-emphasizing transmitter and an equalizing receiver coupled to one another via a high-speed signal path. The receiver measures the quality of data conveyed from the transmitter. A controller uses this information and other information to adaptively establish appropriate transmit pre-emphasis and receive equalization settings, e.g....

20060188044 - Reduced-complexity multiple-input multiple-output (mimo) channel detection via sequential monte carlo: A detection system and method are disclosed which uses sequential Monte Carlo techniques in a multiple-input multiple-output system. The detection system and method samples a first and second component of the modulation symbols separately, thereby reducing the number of symbol candidates and the computational complexity of the system....

20060188045 - Method for selecting and extracting an eye diagram opening for subsequent processing: Measurements for an eye diagram of a signal of interest are placed in a data structure that is examined to locate an eye opening of interest. The eye opening of interest has already been, or is subsequently, normalized into figure of merit units related to the operational voltage and timing...

20060188047 - Method and circuitry for extracting clock in clock data recovery system: A method for extracting a clock in a clock data recovery system is provided. The method includes the following steps. First, a serial link transmission data is sampled for a plurality of times, and a plurality of pulse signals are generated and sequentially arranged. Then, a mark is inserted after...

20060188046 - Prediction of an optimal sampling point for clock resynchronization in a source synchronous data channel: A network device for determining an optimal sampling phase for source synchronous data received on a data communications channel. The network device includes a transmitter clock domain for providing a data pattern along with a synchronous free-running clock. The network device also includes a plurality of phases of a core...

20060188048 - Clock extracting circuit: A clock extracting circuit for receiving an encoded signal and for extracting a clock signal from the encoded signal. The circuit comprises an edge detector that detects rising and falling edges of the encoded signal and produces edge detection pulses indicating the edges being detected; a mask signal generator producing...

20060188049 - Method of and system for controlling frame synchronization for european digital audio broadcasting: Disclosed are a method of and a system for controlling frame synchronization for European Digital Audio Broadcast (DAB), the method including the steps of generating a frame synchronization start-signal with respect to an incoming signal which is input when power is supplied, keeping symbol count values with the value “0”...

20060188051 - Delay locked loop circuitry for clock delay adjustment: A receiver adapted to be coupled to a data bus and configured to receive data in accordance with a receive clock includes first and second delay-locked loops. The first delay-locked loop is configured to generate a plurality of phase vectors from a first reference clock, and the second delay-locked loop...

20060188050 - System and method for adaptively deskewing parallel data signals relative to a clock: A system and method of reducing skew between a plurality of signals transmitted with a transmit clock is described. Skew is detected between the received transmit clock and each of received data signals. Delay is added to the clock or to one or more of the plurality of data signals...

20060188052 - Data transmission controller and sampling frequency converter: In a data transmission controller apparatus, a first-in first-out storage stores newly inputted data in response to a write request signal, and reads and outputs the stored data which has been stored earliest in response to a read request signal. A remaining data amount detection portion detects a remaining data...

20060182166 - Multi-antenna communication system: a) transmit a series of Nseq learning pulses from each emission antenna to all reception antennas. b) for each reception antenna j, estimate the M composite responses of series of emitted pulses that arrive at this reception antenna j, each composite response being estimated by eliminating the effects of other...

20060182167 - Radio transmitter-receiving apparatus and radio transmitting-receiving method for estimating noise and interference power in radio tramission using code spread: A radio transmitter-receiver wherein a pilot symbol is used in the transmitter that has undergone M-chip spreading on the frequency axis and N-chip spreading on the time axis by a spreading code of M×N chip length (where M and N are any integers equal to or greater than 2), and...

20060182168 - Training sequence detection scheme and device of downlink in tdd/cdma system: This invention provides a detection method and device for the training sequence in a downlink TDD/CDMA system. In some TDD/CDMA systems, Multi-user detection (MUD) can be applied in UE, but the conventional training sequence detection method of great complexity. This invention is to perform matched filter operation on the training...

20060182169 - Systems and methods for characterizing transmission lines using broadband signals in a multi-carrier dsl environment: Using DSL modems as data collectors, the modems processes the data to, for example, allow easier interpretation of the line characteristics. In particular, the modems postprocess the data including calibration, filter compensation, determination of the SNR medley from the bits and gains tables and rate conversion. The interpretation process uses...

20060182170 - Jitter measurement apparatus, jitter measurement method, test apparatus and electronic device: A jitter measuring apparatus for measuring timing jitter of a signal-under-test is provided, wherein the jitter measuring apparatus includes a pulse generator for outputting a pulse signal of a predetermined pulse width for an edge of the signal-under-test, whose timing jitter is under test; and a jitter measuring sub-unit for...

20060182171 - Multistage tuning-tolerant equalizer filter: A multistage equalizer filter (100) is presented for compensating a received distorted signal having an amplitude for frequency dependent signal modifications introduced by a transmission channel. The filter (100) comprises at least one amplifying compensation stage (21a, 21b, 21c, 21d) having a gain and a saturation level, the gain being...

20060182172 - Feedback equalizer for a communications receiver: A feedback equalizer is provided that minimizes the critical path time in a multi-level modulation receiver. The critical path is reduced by parallel operation of some summation components of the feedback equalizer. The critical path is further reduced by pre-computing coefficients for the feedback equalizer. Further, the critical path is...

20060182173 - Method and apparatus for processing video signal: An apparatus for processing a video signal with N frames is provided. The apparatus includes an encoding module and a selecting module. The encoding module performs a 1st through a Nth encoding procedure. The 1st through the Nth encoding procedure respectively encodes the 1st through the Nth frame among the...

20060182175 - Image encoding apparatus, image encoding method, and computer program product: An image encoding apparatus includes an image obtaining unit configured to obtain an image from outside; a tentative encoder that performs a tentative encoding of the image in a predetermined quantization step; an encoding error calculator that calculates an encoding error between a tentative encoded image and the image obtained...

20060182174 - Method for coding mode selection of intra prediction in video compression: A method and apparatus for selecting a coding mode of intra prediction in video compression. The method adapts an alternative full search (AFS) algorithm which reduces the computations of a conventional full search (FS) method. In the method, estimated sums of predicted blocks are obtained without actually forming predictors. By...

20060182176 - Methods and apparatus for decoding and displaying different resolution video signals: Methods and apparatus for implementing a reduced cost HDTV/SDTV video decoder are disclosed. The described joint video decoder is capable of decoding HDTV pictures at approximately the resolution of standard definition television pictures and can be used to decode HDTV and/or SDTV pictures. The described video decoder may be used...

20060182178 - Moving picture data transmission apparatus: A moving picture data transmission apparatus according to the present invention includes: a weight assigner which assigns a weight to a macroblock on a first picture frame in accordance with the ratio of an overlap region where a reference picture block overlaps the macroblock on a picture frame; and a...

20060182177 - System and method for video motion processing: In motion compensated video processing, a method of combining a plurality of pictures from an input sequence to form an output picture temporarily intermediate two of the input pictures by projecting input pixels to locations on the output picture according to motion vectors assigned to the input pixels, in which...

20060182179 - Video coding and decoding methods with hierarchical temporal filtering structure, and apparatus for the same: A method and apparatus for video coding and decoding with hierarchical temporal filtering structure are disclosed. A video encoding method in a temporal level having a hierarchical temporal filtering structure, includes generating prediction frames from two or more reference frames that temporally precede the current frame; generating a residual frame...

20060182181 - Apparatus and method for controlling data write/read in image processing system: An apparatus and method for writing and/or reading data in an image processing system are provided. The apparatus for writing data includes: a memory formed with at least one or more banks capable of being accessed independently; and a memory control unit controlling so that a luminance component, a first...

20060182180 - Encoding apparatus and method, decoding apparatus and method, recording medium, image processing system, and image processing method: An encoding apparatus for encoding input image data includes a splitting section that splits the image data into blocks of a predetermined size, a detection section that detects, as a characteristic amount of each block split by the splitting section, at least the number of extreme values representing the number...

20060182182 - Image decoding apparatus and memory management unit: An image processing system includes a memory management unit and an image decoding apparatus. The memory management unit receives first information regarding control of a frame memory, releases a frame in the frame memory in accordance with the first information, and outputs second information indicating the released frame. The image...

20060182183 - Method and apparatus for masking of video artifacts and/or insertion of film grain in a video decoder: A video decoder comprising (i) a post-processing filter block, (ii) a comfort noise addition block and (iii) a video value/range adjustment block, where the comfort noise addition block is integrated into a video output path of the video decoder. The post-processing filter block may be configured to perform one or...

20060182184 - Device and method for pre-processing before encoding of a video sequence: The invention relates to a device for pre-processing before encoding of a sequence of images including: means of storing the current frame and at least two preceding frames, means of defining a vicinity for each point of the current frame and for each corresponding point in the two preceding frames,...

20060182185 - Radio communication system and radio transmitter: Radio communication system includes radio transmitter including adding unit adding parity bit for error detection to data, spreading unit spreading, in time-and-frequency direction, data with parity bit, based on spreading pattern, transmission unit transmitting spread data, and reception unit receiving retransmission-request signal, wherein in response to retransmission-request signal, spreading unit...

20060182186 - Volume control device for digital signals: A digital volume control device comprises a logic unit for volume control of digital input signals. Successively supplied m-bits words with maximally k bits active, derived from the output signals of or supplied by a volume control (4) with a quantizer (5) element the filtered m-bits workds are passed, however,...

20060182187 - Automatic reconfiguration of an i/o bus to correct for an error bit: A test pattern is loaded into a driver data shift register and sent from a driver chip to a receive chip over an M bit bus (0 to M−1). The test pattern is also generated at the receiver chip and used to compare to the actual received data. Failed compares...

20060182188 - Radio integrated circuit: A radio LSI is provided that is not to cause a delay in sending acknowledgement data. A latch circuit provided in a sending/receiving section latches frame control information out of data being received. A decoder decodes the frame control information to decode a data length and structure of an address...

20060182189 - Apparatus and method for optimally compensating for imbalance between in-phase and quadrature-phase in a zero-if ofdm receiver: An optimum I/Q imbalance compensating apparatus and method in a zero-IF OFDM receiver. In the apparatus, a first compensator generates a first symbol by removing interference from a second distorted symbol on an (Ns−m+1)th subcarrier from a first distorted symbol on an mth subcarrier by a first compensation coefficient in...

20060182190 - Distribution line carrier transmitting device: There is provided a distribution line carrier transmitting device which supports, for example, frequency division communication and in which even a frequency band used for communication is variable, a filter to be used is changed according to the frequency band, so that an influence of noise is eliminated, and stable...

20060182194 - Integrated fec decoding and iterative diversity reception: Methods, apparatuses, and systems are presented for deriving data from an error correction encoded composite signal involving (a) receiving a composite signal comprising contributions from a plurality of individual signals transmitted over different paths representing a common data sequence encoded using an error correction code, (b) calculating soft values of...

20060182196 - Method for link adaptation: Systems and methods for optimizing transmission of a plurality of data streams on a multiple-input multiple-output channel are described. The systems and methods for optimizing reduce the multiple-input multiple-output channel for each transmission scheme to an equivalent single-input single-output channel for the transmission scheme and transmit the plurality of data...

20060182191 - Selection of training sequences for multiple-in multiple-out transmissions: A cellular communication system comprises a Multiple-In Multiple-Out, MIMO, transmitter (101) and receiver (103). The MIMO transmitter (101) comprises a message generator (303) for generating MIMO messages comprising selected training sequences and transceivers (305, 307, 309) transmitting the messages on a plurality of antennas (311, 313, 315). The training sequences...

20060182195 - Separate fec decoding and iterative diversity reception: Methods, apparatuses, and systems are presented for deriving data from an error correction encoded composite signal involving (a) receiving a composite signal comprising contributions from a plurality of individual signals transmitted over different paths representing a common data sequence encoded using an error correction code, (b) calculating soft values of...

20060182193 - Technique for adaptive equalization in band-limited high data rate communication over fading dispersive channels: In high data rate communication applications where digital data information is error-corrected coded and interleaved and transmitted with spectral limitations over fading dispersive channels, a method and receiver is described that incorporates channel estimation and decision-feedback equalization. Channel estimation is accomplished within a receiver time block with locally generated reference...

20060182192 - Wireless communication system, wireless communication apparatus, wireless communication method, and computer program: Disclosed is a wireless communication system which carries out spatial multiplexing communication forming multiple spatial channels between a pair of a transmitter with multiple antennas and a receiver with multiple antennas, having the transmitter and the receiver. In the system, the multiple spatial channels are divided into one or more...

20060182197 - Blind rf carrier feedthrough suppression in a transmitter: A transmitter is provided that corrects for both static and dynamic offsets to minimize carrier feedthrough. A feedback loop permits correction to be performed during normal operation of the transmitter, rather than during a calibration sequence in which the inputs are zeroed. The transmitter includes an adder that subtracts a...

20060182198 - Multi-dimensional fractional number of bits modulation scheme: A method of encoding information bits of a communication signal for a communication system (10) is provided. The method includes decomposing the communication signal having a corresponding M1-ary modulation constellation into a M2-ary constellation, and a M3-ary constellation to generate one or more symbols Si. The one or more symbols...

20060182199 - Apparatus and method for retransmitting data in a communication system: A communication system includes a transmitter and a receiver. If there is information data to transmit to the receiver, the transmitter generates a first transmission frame by signal-mapping the information data according to a first signal point mapping rule, and transmits the first transmission frame to the receiver. Upon receiving...

20060182200 - Gmsk modulation using a dual-port memory: A GMSK modulator includes a dual-port memory, an address generator and a signal provider, where the dual-port memory respectively outputs in-phase and quadrature phase waveform data to first and second ports in response to in-phase and quadrature phase waveform address signals, the address generator generates the in-phase and quadrature phase...

20060182201 - System for reception of digitally modulated radio signals to a vehicle, using antenna diversity: A reception system for motor vehicles having a diversity antenna system with a plurality of antennas and an antenna switch coupled to a receiver for the reception of digital, MPSK-modulated satellite and terrestrially broadcast radio signals containing phrase reference signals. The antenna diversity system optionally switches through at least one...

20060182203 - Block edge effects in iterative diversity reception: Methods, apparatuses, and systems are presented for deriving data from a composite signal by processing multiple blocks of symbols, involving (a) receiving a composite signal comprising contributions from a plurality of individual signals transmitted over different paths and representing a common data sequence, (b) calculating soft values of a first...

20060182202 - Iterative diversity reception: Methods, apparatuses, and systems are presented for deriving data from a composite signal involving (a) receiving a composite signal comprising contributions from a plurality of individual signals transmitted over different paths, the plurality of individual signals representing a common data sequence, (b) calculating soft values of a first type taking...

20060182204 - Method and apparatus for selecting demodulation processing delays in a receiver: A receiver includes a baseband processor for selecting a set of demodulation processing delays for received signal demodulation from a larger set of candidate delays. In one embodiment, the baseband processor selects the set of demodulation processing delays by calculating at least one metric for each demodulation processing delay in...

20060182206 - Communications system, method and device: A method of estimating channel response in a communications system comprising a transmitting device having a plurality of transmit antennas and a receiving device having at least one receive antenna, the method comprising: (a) Superimposing training sequences onto transmit data to be transmitted by the transmit antennas in order to...

20060182205 - Method for equalizing a digital signal through removal of data dependent jitter: Equalized Acquisition Record are prepared from Original Acquisition Records reflecting Total Jitter and from an existing description of DDJ. Removal of timing DDJ alters the locations of edges associated with data events. Voltage DDJ adjusts the asserted voltage in the central portion of a Unit Interval. One technique for equalizing...

20060182207 - Hybrid stbc receiver: A receiver for a hybrid space time block codes (STBC) scheme using a nonlinear decision feedback (DFB) filter instead of a conventional linear filter which are used in the hybrid STBC scheme, that is, a combination of a spatial division multiplexing (SDM) scheme and a STBC scheme. In the receiver...

20060182208 - Stbc scheme using mmse decision in a non quasi-static channel: The present invention provide a space time block codes (STBC) scheme, where a received signal is filtered by using a minimum mean square error (MMSE) filter, and where channel symbols are individually decoded and converted into bit information, so that an mean square error (MSE) can be minimized by using...

20060182209 - Multi-sampling monobit receiver: A receiver operating at high frequencies with low measurement error. Multiple frequency measurements are made using digital signal processing. Each measurement is based on sampled data acquired with a low resolution but high sample rate analog to digital converter. The converters are clocked at sampling frequencies that are not rationally...

20060182210 - Non-integer delays in iterative diversity reception: Methods, apparatuses, and systems are presented for deriving data from a composite signal involving (a) receiving a composite signal comprising contributions from a plurality of individual signals transmitted over different paths representing a common data sequence, (b) sampling the received composite signal to handle non-integer delay, obtaining a received data...

20060182212 - Method and apparatus for generating synchronization signals for synchronizing multiple chips in a system: A clock generator circuit for generating synchronization signals for a multiple chip system. The clock generator circuit comprises generation of a synchronization signal from a reference clock and chip global clock with edge detection logic. In high performance server system design with multiple chips, a common practice for server systems...

20060182211 - Synchronization system using redundant clock signals for equipment of a synchronous transport network: A synchronization system (D) for equipment of a synchronous transport network comprises, firstly, a first synchronization module (MA) comprising i) a first submodule (SM1A) delivering a first intermediate clock signal derived from a first external reference clock signal or an internal reference clock signal, ii) a second submodule (SM2A) delivering...

20060182213 - Data sampler for digital frequency/phase determination: The present invention, generally speaking, provides a digital circuit and method for forming number streams for frequency and/or phase comparison of digital or digitized signals, referred to herein as clock signals, where typically one of the clock signals is a known clock signal and another of the clock signal is...

20060182214 - Methods to self-synchronize clocks on multiple chips in a system: A method of self-synchronizing clocks in a multiple chip system, by assigning one chip as the master chip and the other chips as slave chips. A training signal is sent from master chip to the slave chips to determine the latency from the master chip to a slave chip, and...

20060182215 - Dynamic recalibration mechanism for elastic interface: A method and apparatus for de-skewing and aligning digital data received over and elastic interface bus is disclosed. Upon receiving the data, it is sent through a programmable delay line. While in the programmable delay line, the data is sampled at three points within the data's eye pattern. The three...

20060176933 - Clock generating method and clock generating circuit: In a clock generating circuit, while a PLL (Phase-Locked Loop) circuit and a modulator are employed, when a frequency dividing ratio of a feedback-purpose frequency divider in the PLL circuit is changed in accordance with modulation data produced based upon a modulation profile of the modulator to perform a frequency...

20060176934 - Serial transmission of data using spread-spectrum modulation for enhancing electromagnetic compatibility: An apparatus for serial transmission of data over a transmission path in a vehicle uses spread-spectrum modulation to enhance the electromagnetic compatibility with other electrical and electronic components in the vehicle. The apparatus includes a transmitter that subjects a clock signal having a predetermined frequency and phase to spread-spectrum modulation...

20060176932 - Spread spectrum clock generation circuit and a method of controlling thereof: A spread spectrum clock generation circuit and a controlling method thereof are disclosed, which provide clocks having less jitter and ideal spread spectrum and enable a reduction in circuit scale and in power consumption. To this end, a current control type modulator 19a is equipped with a current source Ia...

20060176935 - Defective pixel compensation system and display device using the system: With respect to a display device having a high-resolution display panel, It makes possible to prevent to deteriorate the display quality by a dot defect . A display panel having a dot defect is identified and coordinates of the defective pixel are determined. The brightnesses of pixels adjacent to the...

20060176936 - Method and apparatus for transmission and reception of data: Various embodiments are described to provide for the transmission and reception of data in an improved manner. Data transmission is improved by including in a transmitter a null generator (110) to generate an output data symbol sequence that exhibits nulls in the frequency domain at particular frequencies that an input...

20060176938 - Method and apparatus for transmitting and receiving high speed data using code division multiple access channels: The present invention describes a spread spectrum communication system wherein the frequency of carriers and the code channels of the carriers or both for transmission to a given remote station user vary in time. This provides for a direct sequence spectrum communications system which changes frequency or code channel according...

20060176937 - Method for rake finger placement with reliable path detection: In the method for rake finger placement in a receiver, a delay profile of a multipath transmission channel is determined, wherein the signal strength is distributed over a plurality of delay times in at least one path component in the delay profile. At least a part of the at least...

20060176939 - Signal separation techniques to provide robust spread spectrum signal decoding: A spread spectrum communications system includes an antenna array for receiving different summations of desired and undesired signals, and receivers are coupled to the antenna array. Each receiver operates based upon a respective channel code for de-spreading the desired and undesired signals for determining at least one desired signal associated...

20060176940 - Clock generator circuit and related method for generating output clock signal: The present invention discloses a clock generator circuit for generating an output clock signal. The clock generator circuit includes: a random frequency code generator for generating a frequency code randomly, wherein the random frequency code generator is clocked by a first clock signal; an accumulator electrically connected to the random...

20060176941 - Wireless communications device performing block equalization based upon prior, current and/or future autocorrelation matrix estimates and related methods: A wireless communications device may include a wireless receiver for receiving signals comprising alternating known and unknown symbol portions, and a demodulator connected thereto. The demodulator may include: a channel estimation module for generating respective channel estimates for a prior unknown symbol portion(s), current unknown symbol portion and for future...

20060176942 - On-line reconfiguration and synchronization protocol for multi-carrier dsl: A communication system is disclosed, and includes a transmission system operable to transmit data to a receiver over a communications medium. The transmission system is configured to provide an indication of a change in system configuration as a synchronization flag temporarily assigned to a plurality of data sub-channels to effectuate...

20060176943 - Serializer deserializer (serdes) testing: The various embodiments of the invention provide an apparatus, system and method of testing a serializer and deserializer data communication apparatus (SERDES). The serializer and deserializer data communication apparatus has a plurality of serialize data communication channels adapted to convert parallel data to serial data and a plurality of deserialize...

20060176944 - Synthesizer design for network testing device: A system for generating two signals whose frequencies remain a desired difference from each other while the frequencies for both of the electromagnetic signals vary through multiple ranges of output frequencies. The system includes first, second, and third tunable synthesizers, and a first and second mixers. The first tunable synthesizer...

20060176946 - Adaptive equalizer circuit: An adaptive equalizer circuit equipped by a control unit for controlling an equalizer circuit, comprising a detection unit for detecting an identity of a preset data pattern with a data pattern as a result of data judgment for an output of the equalizer circuit, a monitor unit for sequentially monitoring...

20060176947 - Apparatus and method for setting tap coefficient of adaptive equalizer: There is provided an apparatus and method for initializing a tap coefficient of an adaptive equalizer constituting a read path for a storage medium, where the apparatus includes an FIR filter, a Viterbi decoder, a level error detector, and a tap coefficient updater, the FIR filter receives a first signal...

20060176945 - Decoding device and decoding method: A decoding apparatus that is capable of calculating of the likelihood information at high speed while suppressing increases in processing amount and in circuit scale. In this apparatus, in computations of the backward probability in a backward probability computing section (112), while one processing system calculates the backward probability βk...

20060176948 - Decision-feedback channel equalizer usable with a digital receiver and method thereof: A decision feedback channel equalizer of a digital receiver includes a feedforward filter to receive and filter a demodulated signal to remove one or more ghost signals, a hard decision unit to decide a decision value based on a first signal outputted from the feedforward filter, a feedback filter to...

20060176949 - High performance equalizer having reduced complexity: An apparatus and method for implementing an equalizer which combines the benefits of a decision feedback equalizer (DFE) with a maximum-a-posterori (MAP) equalizer (or a maximum likelihood sequence estimator, MLSE) to provide an equalization device with significantly lower complexity than a full-state MAP device, but which still provides improved performance...

20060176950 - Apparatus for assisting video compression in a computer system: One embodiment of the present invention provides an apparatus that facilitates compression of video data in a computer system by performing the time-consuming task of computing the difference between successive frames of video data. Thus, one embodiment of the present invention can be characterized as an apparatus for compressing video...

20060176951 - System and method for selective image capture, transmission and reconstruction: A video processing method and system for generating a foveated video display with sections having different resolutions uses a network channel for communicating video images having video sections of different resolutions, and includes a video transmission system for processing and transmitting the received video images over the network channel. The...

20060176954 - Method and system for image processing in a microprocessor for portable video communication devices: Methods and systems for processing video data are provided herein. Aspects of the method may comprise receiving on a chip, a plurality of video frames and storing a portion of the received video frames in a memory on the chip. A first portion of the stored video frames may be...

20060176955 - Method and system for video compression and decompression (codec) in a microprocessor: Methods and systems for on-chip processing of video data are disclosed herein. In one aspect of the method, a plurality of lines in a current video frame may be received on a chip. A portion of a plurality of previously processed video frames, occurring prior to the plurality of lines...

20060176953 - Method and system for video encoding with rate control: Described herein is a rate controller in a video system. The rate controller is comprised of a bit count estimator and a quantization selector. The bit count estimator receives an input to an encoder and generates a bit count estimate. The bit count estimate is an approximation of a bit...

20060176956 - Method and device for coding a video picture in inter or intra mode: The method is characterized in that the step for selecting a coding mode from the inter modes and from the intra modes is broken down into two sequential steps, a step for preselecting the intra coding mode for preselecting an intra mode for the current macroblock from the intra coding...

20060176957 - Method and apparatus for compressing multi-layered motion vector: A method of compressing a motion vector (MV) of a first macroblock when the region of a first lower layer corresponding to the first macroblock of a current layer frame does not have an MV is provided. The method includes interpolating the MV of a second macroblock to which the...

20060176958 - Device and method for analysing images: The invention relates to a method and a device for analysing video images. According to the invention the device comprises: means of obtaining the high-frequency components of an image, means of obtaining a high-frequency image on the basis of the said high-frequency components, means of calculating the variance for each...

20060176952 - System of intra-picture complexity preprocessing: A system having a video pipeline that includes a variation calculation portion is disclosed. The variance calculation portion calculates a plurality of variance values for a macroblock. A DCT-type indicator for the macroblock is determined based upon the plurality of variance values....

20060176960 - Method and system for decoding variable length code (vlc) in a microprocessor: Methods and systems for processing video data are provided herein and may comprise receiving an input encoded bitstream to be processed. A portion of the received input encoded bitstream may be matched against stored indexed variable length code entries having a corresponding video information entry. If a match is found,...

20060176959 - Method and system for encoding variable length code (vlc) in a microprocessor: Methods and systems for processing video data are provided herein and may comprise receiving input video information to be processed and matching a portion of the received input video information against a portion of stored indexed video information entries having a corresponding variable length code whose length varies among stored...

20060176962 - Image coding apparatus and image coding method: The image coding apparatus does not determine the intra-frame prediction mode based on the prediction error of the entire blocks included in a macro block, but executes intra-frame prediction with the predetermined intra-frame prediction mode for a certain block. The block selection unit judges that the current block to be...

20060176961 - Method for reducing bit rate requirements for encoding multimedia data: Some representative embodiments are directed to systems and methods for compressing a data set. In one embodiment, a method comprises receiving a frame of data to be encoded, generating a residual frame that represents a difference between the received frame and one or several reference frames, performing a respective sum...

20060176963 - Method for creating a system clock in a receiver device and corresponding receiver device: According to a method for generating a system time clock in a receiving device for digital packetized elementary data streams (E), the packetized elementary data streams (E) being generated in a transmitting device by sampling at a sampling frequency (fsample) synchronized by a system time clock of the transmitting device,...

20060176964 - Channel optimization system: A channel optimization system for use with a communications channel and method of separating and encoding signals associated with the communications channel. In one embodiment, the channel optimization system includes an assorter that receives first and second signals having disparate transmission characteristics and selects one of the first and second...

20060176968 - Adaptive viterbi decoder for a wireless data network receiver: A configurable Viterbi decoder to decode a coded signal for inclusion in a radio receiver for implementing the physical layer receiving function (PHY) of a wireless data network. The decoder includes a branch metric generator with an input to the coded signal, an ACS subsystem coupled to the branch metric...

20060176969 - Apparatus and method for reducing the crest factor of single carrier or multi-carrier signals: An apparatus for reducing the crest factor of a multi-carrier transmission system. The apparatus comprises a plurality of single carrier crest factor reduction circuits. Each of the single carrier crest factor reduction circuits receives a selected one of a plurality of single carrier signals and generates a crest factor reduced...

20060176965 - System and method for removing interfering narrowband signals from wide bandwidth receive signal: In accordance with the present invention, the system and method removes interfering signals from a communications signal and includes a Fast Fourier Transform (FFT) circuit for taking the FFT of a received signal and segmenting the signal into segments. A frequency shifting circuit can shift each segment in frequency to...

20060176967 - Time correlation of signal power to distortion characteristics: Time correlation of signal to distortion characteristics is achieved by acquiring time domain data for a frequency band representing a communication signal, the communication signal having multiple channels. The time domain data is simultaneously converted to frequency and demodulation domain data in sequential time blocks. The frequency and demodulation domain...

20060176966 - Variable cyclic prefix in mixed-mode wireless communication systems: A method in a wireless communication network infrastructure entity (200), including transmitting a plurality of symbols in a sequence, some of the symbols associated with a first transmission mode, for example, point-to-point, and some other symbols associated with a second transmission mode, for example, point-to-multipoint, different than the first transmission...

20060176972 - Method and system for optional closed loop mechanism with adaptive modulations for multiple input multiple output (mimo) wireless local area network (wlan) system: Aspects of a method and system for an optional closed loop mechanism with adaptive modulations for a multiple input multiple output (MIMO) WLAN system are provided. One aspect of the system may comprise a receiver that may select, for a plurality of spatial streams, a modulation type and/or coding rate....

20060176971 - Multi input multi output wireless communication reception method and apparatus: A Multi Input Multi Output (MIMO) Wireless Communication Reception Method and Apparatus are proposed whereby in a 2-way wireless communication system with scattering propagation channels, where several data sub-streams are simultaneously transmitted from a transmitting side to a receiving side, and where no channel information is necessarily available at the...

20060176974 - Radio communications device with adaptive combination: To reduce costs in multiple-input multiple-output (MIMO) and other wireless communication systems an arrangement is described whereby adaptive combination is used at user equipment in order to produce two or more directional antenna beams. Improvements in carrier to interference levels result....

20060176970 - Smart antenna solution for mobile handset: A mobile terminal with smart antennas, comprises a plurality of groups of radio frequency signal processing modules (300), for transforming received multi-channel radio frequency signals to multi- channel baseband signals; a smart antenna processing module (306), for smart antenna baseband processing said multi-channel baseband signals output from said plurality of...

20060176973 - Vertical adaptive antenna array for a discrete multitone spread spectrum communications system: Two or more antenna elements are arranged in the vertical direction to give vertical spatial adaptivity to a wireless discrete multitone spread spectrum communications system. The system is based on a combination of Discrete Multitone Spread Spectrum (DMT-SS) and multi-element adaptive antenna array technologies. This enables the automatic positioning of...

20060176975 - Method for modulator auto-iq calibration: A method of auto-I/Q calibration in modulator and demodulator, including DC cancellation, gain imbalance and phase error calibration is provided for implementation in a front-end circuit without the use of baseband processing signal. In modulator auto-I/Q calibration, the gain amplifier, peak detector, DC gain cell and comparator and auto-I/Q calibration...

20060176976 - Transport format data transmission: In a flexible layer one (403) of a GERAN transmitter device, a TFCI, which indicates a particular combination of cyclic redundancy check, channel coding and rate matching, is generated by a TFCI generating process (412) using information from the medium access control layer. The TFCI is coded by a coding...

20060176977 - Method and apparatus for use of space time trellis codes based on channel phase feedback: A method for MIMO wireless communication comprises the steps of generating inner and outer codes based on channel state information available at a transmitter and concatenating different inner codes with different outer codes; and using the generated concatenated inner and outer codes for wireless communication. The inner and outer codes...

20060176978 - Fsk signal generator: An FSK signal generator includes a first clock generator which generates a first clock pulse having a frequency n·f1, a second clock generator which generates a second clock pulse having a frequency n·f2, a switch which serves so as to output the first or second clock pulse in accordance with...

20060176979 - Wave detection device, method, program, and recording medium: It is possible to detect a reception signal at a high speed. A wave detection device includes: a first signal output unit for outputting a first signal s[n] which is a sum of a digital input signal subjected to A/D conversion and an output from a feedback signal output section;...

20060176980 - Symbol timing recovery apparatus usable with vsb receiver and method thereof: A symbol timing recovery apparatus usable with a VSB receiver, includes a first correlator to calculate a first correlation value between an I channel receiving signal and a timing recovery reference signal, a second correlator to calculate a second correlation value between a Q channel receiving signal having a phase...

20060176981 - Blind detection method and apparatus, and mobile communication receiver having the same: In a blind detection apparatus and method capable of determining a modulation mode by comparing the absolute values of the real and imaginary parts of a sequence of intersymbol phase differences between symbols separated from each other at an interval of four symbols (instead of comparing intersymbol phase differences of...

20060176982 - Apparatus, system, and method for asymmetric maximum likelihood detection: An apparatus, system, and method are disclosed for asymmetric maximum likelihood detection. An initialization module initializes a plurality of branch metrics and a plurality of path memories. A coefficient module calculates a plurality of coefficients. A computation module calculates a first and second specified likelihood function. A selection module calculates...

20060176984 - Efficient header acquisition: In an integrated satellite receiver, improved header acquisition techniques are described for quickly locating a header symbol sequence in a data stream substantially implemented on a single CMOS integrated circuit. To identify the location of a header symbol sequence in a data stream, a selected header acquisition technique employs a...

20060176983 - Wireless communications device providing enhanced block equalization and related methods: A wireless communications device may include a wireless receiver receiving wireless signals having alternating known and unknown symbol portions over a channel, and a demodulator systolic array connected to the wireless receiver. The demodulator systolic array may include: a channel estimation module generating respective channel estimates for each unknown symbol...

20060176986 - Automatic gain control method and apparatus: Disclosed herein are an automatic gain control apparatus and automatic gain control method for a broadcasting receiver equipped with a cable modem. The automatic gain control apparatus includes a splitter for splitting a received signal into a cable modem input signal and an external output broadcast signal, a gain selector...

20060176985 - Gain control in signal processing with feed-forward gain correction: A method and system is disclosed for providing an automatic gain control in signal processing. After receiving a stream of analog signals, a gain is adjusted on the received analog signals using a first set of gain compensation parameters. Then, the adjusted analog signals are converted to digital signals. A...

20060176987 - Method and system for channel equalization: One embodiment includes a method of receiving a transmitted signal. The method comprises receiving a signal transmitted over a channel. The signal comprises a known signal and an information signal. The method further includes determining at least one indicator of channel characteristics based at least in part on the portion...

20060176988 - Receiving apparatus and method thereof: A receiving apparatus and method thereof. In an example, the receiving apparatus may include a clock generating unit generating a plurality of internal clock signals based on a received external clock signal and an equalization receiving unit receiving the plurality of internal clock signals and an input signal. The equalization...

20060176990 - Apparatus for communications: An apparatus for communications includes, a front processor for outputting a digital formatted base band signal with quadrature demodulating a modulated signal; an interpolation processor for interpolating to adjust a phase error in accordance with sampling timing on the basis of the base band signal outputted from the front processor...

20060176989 - Digital demodulator with improved hardware and power efficiency: A demodulator for use in a receiver converts a digital baseband signal into inbound digital symbols with reduced hardware complexity and reduced power consumption. The demodulator includes a lowpass filter operably coupled to filter the digital baseband signal to produce a filtered digital baseband signal, and an equalizer operating at...

20060176991 - System for adjusting sampling timing of dll circuit, method therefor and transmitter-receiver used therefor: An object of the present invention is to provide a DLL circuit adjustment system that can adjust the sampling timing of a DLL circuit without causing any increase of the number of interface signals or amount of coding overhead and any reduction of the data transfer efficiency. On a transmitter...

20060176992 - Frequency-lock detector: A frequency-lock detector (FLD) adapted to register more than one target count per period of a target clock signal to generate a count value related to a frequency difference between the target clock signal and a reference clock signal. In various embodiments of the invention, this count registration is implemented...

20060176993 - Transmission method for mimo system: A signal transmission method for a multiple input multiple output (MIMO) communication system. A transmitter having a plurality of transmission antennas receives antenna selection information from a receiver having at least one reception antenna. The transmitter selects at least two transmission antennas based on the antenna selection information, beamforms space-time...

20060176994 - Adaptable phase lock loop transfer function for digital video interface: A digital video interface receiver adjusts a transfer function of a phase-locked loop circuit having a programmable charge pump, a programmable phase-locked loop filter, or a programmable gain voltage controlled oscillator. The digital video interface receiver monitors and detects errors in a data stream associated with the phase-locked loop circuit....

20060171444 - Apparatus and method for generating spreading code using jacket matrix and code channel spreading device using the same: Provided is a spreading code generating apparatus using a jacket matrix, a method thereof, and a code channel spreading device using the same. The present research provides an apparatus for generating a spread quasi-orthogonal function, which is a spreading code, by using a jacket matrix and a known short bent...

20060171445 - Methods and systems for detecting and mitigating interference for a wireless device: In at least some embodiments, a method for mitigating interference between an Ultra Wideband (UWB) device and a non-UWB device is provided. The method includes, dynamically determining if a frequency channel associated with the non-UWB device is being used. If the frequency channel is being used, the method adjusts a...

20060171446 - Data multiplexing apparatus: A data multiplexing apparatus for arranging video streams and audio streams respectively into packs and multiplexing these packs to create a system stream. The apparatus includes a virtual decoding video buffer occupancy calculator virtually calculating an occupancy of a decoding video buffer temporarily storing the video streams, a virtual decoding...

20060171447 - Method for interwoven spreading codes: An interwoven spreading code is formed by a stretched spreading code series at a first frequency and a mirror of the stretched spreading code series at a second frequency. The interwoven spreading code can be used to spread a baseband signal. Data can be recovered through correlation of a received...

20060171448 - Circuit and method for rake training during acquisition: A method is provided for training a rake finger (200). In this method the rake finger receives a data signal including a plurality of signal components having a plurality of signal phase values, respectively. (620). The rake finger then sets a current acquisition phase for a locally-generated signal (620) and...

20060171449 - Interference estimation in the presence of frequency errors: Methods and apparatus for estimating interference level in a receiver are dominated by the receiver's residual frequency error when the interference is low. The interference estimation method can be changed when the interference is low such that it compensates for the effects of residual frequency errors. A method of estimating...

20060171450 - Serializer clock synthesizer: A clock synthesizer uses a serializer to convert a parallel data stream into clock signals. The frequency of the synthesized clock is dependent on the bit values of the parallel data stream and the frequency of the reference clock used by the serializer. Rapid tuning of the frequency is provided...

20060171451 - Adaptive equalizer with a dual-mode active taps mask generator and a pilot reference signal amplitude control unit: An adaptive equalizer including an equalizer filter and a tap coefficients generator used to process a sample data stream derived from a plurality of received signals is disclosed. The tap coefficients generator includes an equalizer tap update unit, a vector norm square estimator, an active taps mask generator, a switch...

20060171452 - Method and apparatus for dual mode digital video recording: A method and apparatus for recording video data in a surveillance system comprising receiving video data from a surveillance camera, recording the received video data at a first rate, and recording the received video data at a second rate with the second rate being slower than the first rate....

20060171453 - Video surveillance system: A video surveillance system includes one or more cameras communicatively coupled to a control system via a dual use medium. The video surveillance system includes a setup mode, a live viewing mode, a record mode, and a search/playback mode, some of which may operate simultaneously. In a live viewing mode,...

20060171460 - Image conversion apparatus: A rate conversion apparatus 10 includes a quantization parameter setting unit 107 and a rounding threshold value setting unit 108. The quantization parameter setting unit 107 determines a quantization parameter change amount according to a code amount of encoded data output from a variable length encoding unit 109 and a...

20060171455 - Method and system for encoding video data: Described herein is a rate controller in a video system. The rate controller is comprised of a complexity estimator, a quantization level selector, a complexity generator, and a complexity estimate updater. The complexity estimator generates a complexity metric estimate. The quantization level selector sets a quantization level based on the...

20060171458 - Method and system for parameter generation for digital noise reduction based on bitstream properties: A method and system for parameter generating for digital noise reduction based on bitstream properties is provided, which may comprise receiving at a host processor, a plurality of picture level parameters generated by a video decoder for a video stream. The host processor may control a digital noise reduction (DNR)...

20060171454 - Method of video coding for handheld apparatus: The present invention relates to method of coding blocks of video data for a handheld apparatus comprising a battery. Said method comprising a step of computing a residual error block from the use of a set of prediction functions having different power consumption levels. It also comprises a step of...

20060171459 - Quantization matrix for still and moving picture coding: A quantization matrix used in inverse quantization is generated. A received bitstream includes a coded truncated quantization matrix. The coded truncated quantization matrix has first coded bits and second coded bits. The first coded bits include bits obtained by coding a transmitting part of quantization elements and the second coded...

20060171457 - Rate control for digital video compression processing: A video compression algorithm for converting a digital video stream having video content into a compressed video bitstream, includes rate control to control the size of the compressed video bitstream. The rate control takes into account two or more of (1) detected scene changes, (2) detected repeated fields resulting from...

20060171456 - Video encoding methods and systems with frame-layer rate control: A frame-layer rate control method, and a video encoding method and system. In a first-step encoding stage, a QP of a previous frame is used to determine MVs and MB modes for all MBs in a current frame through R-D optimization, and the residual signal is encoded and then decoded...

20060171461 - Residual coding in compliance with a video standard using non-standardized vector quantization coder: This disclosure describes residual coding techniques that use vector quantization coding, which relies on template matching. However, rather than transmit vector quantization codebook indexes (or codewords) that may have no meaning to standard compliant CODECs, the techniques described herein map the residual templates to pre-computed compressed residual blocks that are...

20060171463 - Apparatus, system for, method of and computer program product for separating and merging coded signal: Herein disclosed is a bit stream separating and merging system comprising a bit stream separating apparatus (1000) for inputting and transcoding an original bit stream A to separate into and generate a base bit stream B and one or more extended differential bit streams E*, each having a partial differential...

20060171462 - Video encoding method: The invention relates to a method of encoding a sequence of frames, by means of a three-dimensional subband decomposition applied to successive groups of frames together with motion estimation and compensation steps. As these steps lead to some unconnected pixels that highly impact the resulting picture quality, it is proposed,...

20060171464 - Method and apparatus for motion estimation: A method and apparatus for motion estimation in which the amount of computation can be reduced are provided. The method for motion estimation includes storing an interblock match difference calculated for a previous matching block to be motion estimated, calculating an interblock match difference for a current matching block to...

20060171465 - Dct compression using golomb-rice coding: An apparatus and method for encoding quantized frequency represented data, the data comprising zero and non-zero represented data is claimed. For zero represented data, a zero run length is determined. A Golomb parameter is determined as a function of the zero run length. A quotient is encoded as a function...

20060171467 - Method and system for block noise reduction: In a video system, a method and system for block noise reduction are provided. Edge parameters based on spatial variance may be determined to detect vertical edges that may result from block noise. These edge parameters may be determined serially. Once detected, pixels neighboring the vertical edges may be filtered...

20060171466 - Method and system for mosquito noise reduction: In a video system, a method and system for mosquito noise reduction are provided. Mosquito noise may be detected by determining a block variance parameter for an image block and a local variance parameter for a portion of the image block. The block variance parameter may be based on serially...

20060171468 - Method and system to improve the transport of compressed video data: A method comprises determining a plurality of time intervals Tp and Tn within a variable bit rate (VBR) representation of an image sequence. The time intervals Tp are those in which a number of blocks of information per unit time is greater than a baseline value. The time intervals Tn...

20060171469 - Method and system to improve the transport of compressed video data: A method comprises determining a plurality of time intervals Tp and Tn within a variable bit rate (VBR) representation of an image sequence. The time intervals Tp are those in which a number of blocks of information per unit time is greater than a baseline value. The time intervals Tn...

20060171472 - Adaptive filtering based upon boundary strength: Adjacent regions are identified in an image. Coding parameters for the adjacent regions are identified. Selective filtering is performed at the region between the identified adjacent regions....

20060171470 - Method and apparatus for decoding compressed video image data: A method and an apparatus for decoding video image data including a plurality of frames are provided. Each of the frames includes a reserved portion and a non-reserved portion. The method comprises decoding only the non-reserved portion of one of the frames and displaying the decoded non-reserved portion of the...

20060171471 - Random access in avs-m video bitstreams: Random access indicator as a nal_unit_type in video compressed with AVS-M for an access unit not requiring prior access unit information for decoding an IDR....

20060171474 - Digital data insertion apparatus and methods for use with compressed audio/video data: Methods and apparatus for inserting data a compressed data bitstream are disclosed. The methods and apparatus time shift first data in a first portion of the compressed data bitstream to increase a size of a second portion of the compressed data bitstream and insert second data in the second portion...

20060171475 - Error concealment apparatus and method: An error concealment apparatus and method that can selectively use error concealment techniques according to an error occurrence rate is disclosed. The error concealment apparatus includes an error detection unit for detecting errors occurring in video frames, first and second error concealment units for concealing the detected errors, and a...

20060171473 - Method and system for combining results of mosquito noise reduction and block noise reduction: In a video system, a method and system for combining results of mosquito noise reduction and block noise reduction are provided. Noise artifacts may be reduced in a video image by generating a first pixel correction value that combines a first and a second noise reduction parameters utilizing a first...

20060171476 - Digital method and device for transmission with reduced crosstalk: The invention relates to a method and a device for transmission with reduced crosstalk in interconnections used for sending a plurality of signals, such as the interconnections made with flat multiconductor cables, or with the tracks of a printed circuit board, or inside an integrated circuit. An interconnection with four...

20060171477 - Digital transmission circuit and method providing selectable power consumption via single-ended or differential operation: A digital transmission circuit and method providing selectable power consumption via single-ended or differential operation improves the flexibility of an interface while reducing power consumption when possible. A differential path is provided through the transmitter output driver stages and portions are selectively disabled when the transmission circuit is in a...

20060171478 - Dual loop signal quality based link adaptation: The invention relates to a method, a device and a system for adapting a communications link based on a quality estimate for a signal transmitted via the communications link. The method comprises receiving and demodulating the transmitted signal, assessing the demodulated signal to derive a first estimate for the signal...

20060171479 - Apparatus and method using multiple modulation schemes in an ofdm/ofdma wireless network: A flexible and scalable deployment of orthogonal frequency division multiplexing (OFDM) technology in a mobile cellular system, including a system that deploys multiple channels within a common base station, in which different modulation techniques are used to compensate for adjacent-channel interference....

20060171480 - Multi-frequency data transmission channel power allocation: A method of controlling a communication device that is operable to transmit digital data over a plurality of frequency channels. The method includes selecting an initial transmission power and a corresponding data rate for each channel. The method also includes identifying in a first channel a first ratio of a...

20060171483 - Decoder for a multiplexed transmission system: Information is decoded from a signal received from a transmission over a MIMO channel from a plurality of transmit antennas, by means of a decoder and a corresponding decoding method. The signal is received on a plurality of receive antennas, and the information is encoded as a string of symbols...

20060171482 - Initiation of a mimo communication: The present invention provides a method and apparatus for initiating a multiple input multiple output (MIMO) communication. The method and apparatus includes processing that begins by transmitting a frame formatted in accordance with a default MIMO active transmitter-receiver antenna configuration to a target receiver. The processing continues by receiving at...

20060171481 - Method and apparatus for constructing mimo constellations that preserve their geometric shape in fading channels: A method and related system of constructing multidimensional constellations whose shape remains invariant despite multiplicative distortions inherent to fading channels, and which provide a means for introducing coding redundancy to a signal without affecting the spectral efficiency of that signal is provided. Specifically, a method is provided for expanding multidimensional...

20060171484 - Polar modulator and a method for modulation of a signal: A polar modulator contains a phase locked loop which is designed to emit a radio-frequency signal at one frequency to one output, with the frequency being derived from the reference signal and from a phase modulation signal at a control input of the phase locked loop. The modulator additionally has...

20060171486 - Adaptive peak windowing for crest factor reduction in a communication system transmitter: In a communication system transmitter, a baseband processor is configured for coupling via an upconverter to an input of a power amplifier of the transmitter. The baseband processor comprises a crest factor reduction element implementing an adaptive peak windowing algorithm for application to an input signal, the adaptive peak windowing...

20060171485 - Serdes auto calibration and load balancing: The present invention is used to automatically calibrate a SERDES device by utilizing information provided in the eye diagram of the received signal. In particular, the invention mitigates the components of determininistic jitter, such as ISI and frequency distortion. To achieve this goal, the invention enables the receive side of...

20060171487 - Wireless reception device automatically establishing frequency synchronization or phase synchronization: The wireless reception device has automatic frequency control unit for detecting, from a reception modulation signal frequency-converted to the baseband, a frequency deviation component of a carrier wave between transmission and reception sides that is contained in the reception modulation signal and removing the frequency deviation component from the reception...

20060171488 - Phase advance compensation for mimo time-switch preamble modes: A communications receiver is provided that includes a first and second compensators 64 and 68, a pilot tracker 60, and a demodulator 66. The first compensator 64 is operable to adjust an input signal based on both a coarse frequency offset and a fine frequency offset to produce an adjusted...

20060171489 - Soft bit viterbi equalizer using partially collapsed metrics: First and second partially collapsed metric values are determined for each bit in a symbol transition. Each first partially collapsed metric value is a cumulative metric of starting in a first state and ending in a second state in L transitions with the respective bit in the symbol transition being...

20060171490 - Viterbi decoder using circulation type decoding units connected in parallel: An analog Viterbi decoder for decoding an analog signal is provided that includes a plurality of decoding units, provided with a plurality of processing parts each having a plurality of cells arranged to correspond to respective nodes of a trellis diagram, for decoding analog input data using an analog signal...

20060171492 - Adjustable rf receiver: The present invention provides adjusting of a radio frequency (RF) receiver that includes processing that begins by enabling an initial setting of the RF receiver, wherein the initial setting is based on a bandwidth of a channel of a plurality of channels. The processing continues by receiving an RF signal...

20060171493 - Apparatus and method for synchronizing symbol timing synchronization applicable to ofdm receiver: An apparatus and method applied to an OFDM receiver performs symbol timing synchronization by correlation between channel impulse responses. The apparatus applicable to an orthogonal frequency division multiplexing (OFDM) receiver, includes a channel impulse response (CIR) estimator for estimating a CIR of a present symbol from which a symbol timing...

20060171491 - Diversity-mode delay lock loop circuit and associated method for a radio receiver: A receiver and method are provided for receiving signals transmitted thereto from a transmitter during operation of a radio communication system. To synchronize the receiver with the transmitter, the receiver includes a delay lock loop circuit capable of receiving a pilot signal and a diversity signal transmitted from a plurality...

20060171494 - Method and system for indicating zero-crossings of a signal in the presence of noise: A device, method, and computer readable medium are used in connection with providing an indication of zero crossings corresponding to a signal. The signal (113) is received. Noise is removed from the signal (103). In response to the signal with noise removed (115), pairs of points and a time value...

20060171497 - Delay locked loop in semiconductor memory device and method for generating divided clock therein: Provided are a delay locked loop (DLL) and a method for generating a divided clock therein. In the DLL, a width of a reference frequency for phase comparison can be changed depending on a magnitude of an operating frequency. In the DLL, a clock buffer receives a clock equal to...

20060171495 - Digital phase detector for a phase locked loop: According to one exemplary embodiment, a digital phase detector includes a phase/frequency detector, where the phase/frequency detector is configured to receive a reference signal and a divided oscillator feedback signal and output a first pulse-width modulated signal and a second pulse-width modulated signal. The digital phase detector also includes a...

20060171496 - Digital pll circuit: A DPLL circuit is provided for making it possible to inhibit an initial frequency offset during holdover. The DPLL circuit includes a slave oscillator for generating a frequency signal corresponding to the size of a control signal value; a phase difference detection circuit for detecting the difference in phase between...