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Pulse Or Digital Communications > Receivers > Particular Pulse Demodulator Or Detector > Correlative Or Matched Filter Correlative Or Matched FilterCorrelative Or Matched Filter patent applications listed are from June 2005 to current and include Date, Patent Application Number, Patent Title, Patent Abstract summary and are linked to the corresponding patent application page.11/08/07 - 20070258547 - Combining signal-interference-ratio (sir) estimates for improved sir estimation An overall SIR estimate is based on a weighted-average of different SIR estimates, wherein the weights are chosen to minimize the mean-square-error (MSE) of the overall SIR estimate. Alternatively, the overall SIR estimate is based on a selection from among the different SIR estimates, based on the expected reliability of ... 10/25/07 - 20070248194 - Method of detecting a predetermined sequence in an rf signal using a combination of correlation and fft A method and apparatus are provided for recognizing a predetermined sequence within a radio frequency signal received on a Doppler faded radio frequency channel. The method includes the steps of correlating a reference sequence with a sequence of elements of the radio frequency signal received on the Doppler faded radio ... 10/25/07 - 20070248193 - Method for fine timing acquisition A method of processing a timing synchronization signal includes selecting an initial sequence of complex numbers and modifying the initial sequence based upon a metric applied to the autocorrelation function to enhance its autocorrelation properties within a predetermined window about the main autocorrelation peak determined by the timing uncertainty of ... 10/18/07 - 20070242782 - Channel estimation apparatus and method for interference cancellation in mobile communication system Channel estimation apparatus and method for interference cancellation in a mobile communication system are provided. The channel estimation method includes detecting a preamble from a received signal and estimating a primary channel using the detected preamble; calculating a short-term correlation matrix using the primary channel; and estimating a secondary channel ... 10/11/07 - 20070237269 - Ultratight navigation observation lock detector An observation lock detector receives I and Q correlations and measurement residuals and transforms the I and Q quadrature correlation outputs based upon computed code phase and carrier phase into transformed I and Q quadrature signals communicated to conventional output lock detectors to provide validity and confidence indicator signals for ... 10/11/07 - 20070237268 - Method and receiver for estimating the channel impulse response using a constant modulus interference removal iteration A receiver and associated method estimates a channel impulse response of the communications signal. A communications signal is received as a burst of transmitted symbols, including a known training sequence. The joint estimation of timing offset and initial channel impulse response is determined based on the cross-correlations of the known ... 09/20/07 - 20070217551 - Digital broadcasting receiving system and method of processing data A digital broadcasting receiving system and method is disclosed. In the data processing method, a known data sequence is tuned so as to be received, when the known data sequence is periodically inserted in valid data and transmitted. Then, the timing error is detected by using a correlation characteristic of ... 09/13/07 - 20070211834 - Emitter pulse detection utilizing adaptive matched filter approach Systems and methods are provided for dynamically analyzing radar pulses at a receiver. A digital signal is provided to an amplitude detector. At least one digital waveform representing an emitter pulse is identified at the amplitude detector. A matched filter associated with the emitter is generated, comprising at least one ... 08/16/07 - 20070189426 - Method, medium, and system decoding and encoding a multi-channel signal A method, medium, and system decoding and/or encoding multiple channels. Accordingly, down-mixed multiple channels can be decoded/up-mixed to a left channel and a right channel during a first stage, thereby enabling a high quality sound output even in scalable channel decoding. ... 08/16/07 - 20070189425 - System and method for improved noise immunity in impulse and radar communications systems A method of improving noise immunity in a signal is provided. The method comprises receiving a multi-bit symbol comprised of pulses and absences of pulses, incrementing a correlation count if a pulse is present when a pulse is expected, and decrementing the correlation count if a pulse is present when ... 06/28/07 - 20070147552 - Method and apparatus for detecting transmission of a packet in a wireless communication system A method and apparatus for detecting transmission of a packet in a wireless communication system are disclosed. A packet includes a preamble which comprises multiple repetition of a training sequence. A signal is detected and the detected signal is correlated with a delayed version of the detected signal which is ... 06/21/07 - 20070140385 - Apparatus and methods for determining timing in a communication system Apparatus and methods for use in a wireless communication system are disclosed for determining a timing position for channel activity in order to resolve timing ambiguity. A disclosed apparatus includes a processor that determines when channel activity occurs in at least one of an early or a late arrival position ... 06/14/07 - 20070133720 - Receiver of pulses of an ultra wide band type signal and associated method A receiver of electromagnetic and a method for receiving electromagnetic signals transmitted in a frequency band having a predetermined upper limit fMAX and representing a stream of information by means of a modulation of pulses at a predetermined average pulse repetition frequency fPRP. The receiver includes an input stage including ... 06/07/07 - 20070127607 - Symbol boundary acquisition apparatus and method thereof The present invention relates to a symbol acquisition apparatus and a method thereof. The method includes: determining a first boundary according to a first preamble symbol and generating a first confidence value according to signal quality of the first preamble symbol; determining a second boundary according to a second preamble ... 06/07/07 - 20070127606 - Synchronization and detection method capable of resisting noise and waveform distortion in communication system and correlator thereof A synchronization method and a detection method capable of resisting noise and waveform distortion in a communication system and a correlator thereof are proposed. In the method, over-sampling is performed to a preamble and a synchronization word in an access code, and a different weighting value is assigned to each ... 05/31/07 - 20070121765 - Timing estimator in oqpsk demodulator A timing estimator of an OQPSK demodulator is provided. In the timing estimator, an A/D converter converts an analog reception signal into a digital reception signal. A differential circuit section delays the digital reception signal from the A/D converter by a preset time and obtains a phase difference between a ... 05/24/07 - 20070116158 - Packet detection in the presence of platform noise in a wireless network Techniques are presented for improving packet detection within a wireless device in the presence of platform noise. ... 05/17/07 - 20070110192 - Method of communicating between control devices of a load control system A load control system for controlling the amount of power delivered to an electrical load from an AC power source includes a load control device and a remote control device. The load control device is operable to control the amount of power delivered to the electrical load in response to ... 05/10/07 - 20070104297 - Detecting a data frame A detector (109) and corresponding method is configured for detecting presence of a data frame. The detector includes a first correlator (123) that is configured to provide a first plurality of correlations corresponding to similarity between data as received and first information, e.g., an ordered set of coefficients, that denotes ... 05/03/07 - 20070098117 - Phase tracking in communications systems The present invention includes a method of determining a phase estimate for an input signal having pilot symbols. The method includes receiving a plurality of pilot symbols, and then multiplying two or more pilot symbol slots by corresponding correlator coefficients to correct a phase estimate of the input signal. ... 05/03/07 - 20070098116 - Apparatus for performing initial synchronization and frame synchronization in mobile communications system and method thereof An apparatus for performing initial synchronization and frame synchronization in a mobile communications system and method thereof are disclosed. First of all, a method and apparatus for performing frame synchronization in a mobile communications system using a correlation value between a received signal and a reference vector for a phase ... 05/03/07 - 20070098115 - Multiframe control channel detection for enhanced dedicated channel A plurality of decoding metrics for a current frame may be generated based on a correlation set for a current frame and a correlation set for at least one previous frame. Whether a signal is present on a control channel may then be determined based on the generated decoding metrics. ... 04/26/07 - 20070092045 - Systems, methods, and apparatuses for fine-sensing modules Systems, methods, and apparatuses are provided for fine-sensing modules that are operative for identifying one or more signal types from an input radio frequency (RF) signal. The fine-sensing modules may include a multiplier that combines an RF input signal and a delayed RF input signal to produce a correlation signal ... 04/26/07 - 20070092044 - Method for symbol timing synchronization and apparatus thereof A method for symbol timing synchronization is provided. The method comprises the following steps. First, a correlation between a sample sequence and a delayed sample sequence is calculated to generate a correlation sequence. Wherein, the delayed sample sequence is obtained from delaying the sample sequence by N sampling points, and ... 03/29/07 - 20070071143 - Methods and apparatus for efficient and accurate coarse timing synchronization in burst demodulators Burst detection with high accuracy is achieved with a single autocorrelation circuit. Autocorrelation is performed using a preamble-embedded correlation sequence chosen such that a steeply sloped peak characterizes the autocorrelation response. The autocorrelation circuit is preferably used multiple times per clock period to deliver correlation moduli at sub-clock multiples. A ... 03/29/07 - 20070071142 - Apparatus and method for multi-phase digital sampling A method and apparatus for determining a relationship between an input signal frequency and a reference signal frequency is envisioned. The system derives a plurality of internal reference signals from the reference signal. The internal reference signals are provided to a level detection circuit which in turn samples the input ... 03/22/07 - 20070064842 - Device, system and method of wireless signal detection Some embodiments of the invention provide devices, systems and methods of wireless signal detection. For example, an apparatus in accordance with an embodiment of the invention includes a detector to determine whether an incoming input includes a wireless communication signal intended for reception, based on an operation applied to a ... 03/15/07 - 20070058758 - Apparatus, method, and program for detecting communication parameter A correlation signal generating circuit generates a duplicate signal for correlation processing based on a multiplex duplication signal. An autocorrelation circuit performs autocorrelation processing through sliding processing of the duplicate signal with respect to a received signal. An Nd detecting circuit detects the length of the data symbol by detecting ... 03/01/07 - 20070047678 - Method and system for combined polarimetric and coherent processing for a wireless system A combined polarimetric and coherent processing receiver (2300) can include at least one antenna (730 and 740), at least one receiver front end (700 and 704), a multipath processor (702, 706, and 714), a polarimetric signal processor (708), and a coherent processor (712). The multipath processor can be a plurality ... 02/22/07 - 20070041479 - Apparatus for determining a frequency offset error and receiver based thereon Pigment compositions for oil-based lithographic printing ink systems are provided which comprise as colourant a mixture of an organic pigment and an organic dyestuff soluble in an organic solvent (solvent dye). The printing inks prepared from these pigment compositions show outstanding improvements in colour strength combined with improvements in both ... 02/15/07 - 20070036247 - Receiver with frequency offset compensation for m-state phase modulation Method and apparatus for a wireless receiver are described which derive at least a first stream of first digitized samples from a received analog signal at a first sampling rate and identify a first frequency offset based on a plurality of parallel correlations using complex reference signals which differ from ... 02/01/07 - 20070025477 - Synchronization technique for serial modulated waveforms Methods and apparatus for synchronization (SYNC) detection of a received serial offset quadrature pulse shaped waveform modulated by a symbol SYNC sequence are provided. The waveform is serially demodulated into a serial baseband signal and serially correlated with segments of the symbol SYNC sequence. Correlation strength estimates of each of ... 02/01/07 - 20070025476 - Fast digital carrier frequency error estimation algorithm using synchronization sequence Methods and apparatus for determining carrier frequency error of a serial offset quadrature pulse shaped signal, such as a minimum shift keyed (MSK) signal, are disclosed. Carrier frequency error is determined by receiving a quadrature pulse shaped signal having a synchronization sequence, detecting synchronization of the quadrature pulse shaped signal, ... 02/01/07 - 20070025475 - Method and apparatus for data signal processing in wireless rfid systems The present invention provides methods and apparatuses for demodulation and decoding of backscattered RFID tag signals, represented by their in-phase and quadrature components at the output of the demodulator in the receiver portion of a reader interrogator. Autocorrelation coefficients for the in-phase and quadrature components of the received signal are ... 01/18/07 - 20070014386 - Diversity receiving apparatus, controlling method of the same, and computer-readable medium containing program therefor A diversity receiving apparatus receives first and second reception signals and is constituted by including one or more phase shifters that generate one or more third signals having phases different from the second reception signal based on the second reception signal, a correlation calculator that obtains a correlation between the ... 01/04/07 - 20070002978 - Synthesizing coherent correlation sums at one or multiple carrier frequencies using correlation sums calculated at a coarse set of frequencies Techniques are provided for synthesizing a long coherent I and Q correlation integral at a particular frequency by synthetically combining a sequence of shorter correlation integrals at the same or different frequency. Techniques are also provided for acquiring a carrier-modulated signal with an unknown shift of the carrier frequency, and ... 12/28/06 - 20060291593 - Decoder and a method for determining a decoding reliability indicator A decoder for use in a wireless communication device, the decoder comprising a correlator for correlating a received data sequence with a set of codewords such that a correlation value is generated for each correlation, wherein the set of codewords correspond to possible codewords that could be generated from encoding ... 12/07/06 - 20060274863 - Method and device for determining the occupancy of a transmission channel The invention discloses a method for determining the occupancy of a transmission channel with the help of a differentially demodulated signal, which was generated transmitter-side with the use of PN sequences from a PN sequence set, which has a first group of first PN sequences and a second group of ... 11/30/06 - 20060269019 - Synchronization signal detector and method A synchronization (sync) signal detector and associated method detect the occurrence of a known sync signal in a received signal. The known sync signal is generated and correlated with the received signal to generate a correlation waveform. A peak value of the correlation waveform, indicative of the occurrence of the ... 11/30/06 - 20060269018 - Method for timing detection A wireless communication system comprises a sampling module that samples a first portion and a second portion of a channel using a sampling time. A correlator module selectively correlates the first portion and the second portion, generates correlation samples, and calculates an offset based on the correlation samples. A timing ... 11/30/06 - 20060269017 - Receiver including false alarm rejection processing and associated methods A receiver includes a matched filter, and an M of N detector is coupled to the matched filter for determining potential synch pulses occurring M of N times. A cluster detector is coupled to the M of N detector for determining a plurality of synch pulse clusters based upon the ... 10/26/06 - 20060239386 - Numerical controller A numerical controller capable of operating an auxiliary function at a target time or spindle position in performing operation based on table format data. An auxiliary function table is stored with auxiliary function commands M to be outputted corresponding to commanded reference times Lc and their corresponding operation delay times ... 10/19/06 - 20060233288 - Method and apparatus for coarse and fine frequency and timing synchronisation Receivers (1) for receiving frequency signals are, to improve their time synchronisation accuracy, provided with synchronisation stages (20) for performing a coarse time synchronisation through autocorrelating samples of a group of preamble symbols (t1,t2,t3) and a fine time synchronisation through crosscorrelating samples of a further group of preamble symbols (t10,G1) ... 10/12/06 - 20060227904 - Correlation method for channel estimation for ofdm The present invention concerns a method for estimating the time-dispersion of a channel comprising D subchannels, wherein one computes from a received signal a set of estimated Channel Transfer Factors (CTF's) Ĥ[ν], where ν(0≦ν≦D) is the subchannel number, said method comprising a step of calculating, for a predetermined strictly positive ... 10/05/06 - 20060222114 - Receiver having digital timing recovery function The invention relates to a receiver having a digital timing recovery function. The receiver of the invention detects frequency offset of a received signal by using symbol correlation between the received signal and a reference signal, and increases/decreases the number of data samples according to the detected frequency offset, thereby ... 10/05/06 - 20060222113 - Method and apparatus for segmented code correlation A method and an apparatus is disclosed for efficient cross correlation of a plurality of signal vectors. Incoming data is partitioned into several segments and processed according to an algorithm where data rotation is a function of post-correlation memory size. ... 09/28/06 - 20060215792 - Minimizing dynamic crosstalk-induced jitter timing skew A digital signal waveform receiving circuit may be processed by a non-linear adaptive canonical correlation analysis circuit that may quantify and minimize crosstalk-induced jitter timing skew for improving set-up and hold timing margins of data streams on the receiving circuit. A non-linear adaptive canonical correlation analysis circuit may be placed ... 09/14/06 - 20060203944 - Apparatus to detect a sync signal, a vsb receiver using the same, and a method thereof An apparatus to detect a sync signal, a VSB receiver using the same, and a method thereof. The apparatus includes a plurality of partial correlators to calculate a first partial correlation value between a sub sequence of a training sequence and an “I” signal of a received signal that corresponds ... 09/07/06 - 20060198474 - Method and system for down-converting and electromagnetic signal, and transforms for same Methods, systems, and apparatuses, and combinations and sub-combinations thereof, for down-converting an electromagnetic (EM) signal are described herein. Briefly stated, in embodiments the invention operates by receiving an EM signal and recursively operating on approximate half cycles (½, 1½, 2½, etc.) of the carrier signal. The recursive operations can be ... 09/07/06 - 20060198473 - Apparatus and method for detecting preambles according to ieee 802.11b wireless lan standard The present invention relates to the field of wireless communication systems and in particular to an apparatus and a method for short preamble detection within the framework of the 802.11b standard. The present invention can be easily implemented in either the radio part (preferred embodiment) or the baseband part (general ... 09/07/06 - 20060198472 - Transmission system, transmitter device, and receiver device A transmission system which is simple in construction and yet can effectively avoid inter-symbol interference. A transmitter device transmits a signal block while repeating the same signal block twice consecutively. A receiver device receives the signal blocks, performs Fourier transform operation on the two identical signal blocks at respective predetermined ... 09/07/06 - 20060198471 - Matched filtering A signal is filtered by multiplying its Fourier transform by the Fourier transform of a reference sequence to which the filtering is to be matched. The reference sequence (e.g. a Golay sequence pair) is defined as an iterative combination of shorter sequences and its Fourier transform is generated by an ... 08/31/06 - 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 ... 08/31/06 - 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. ... 08/24/06 - 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 ... 08/10/06 - 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 ... 08/10/06 - 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 ... 08/03/06 - 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 ... 08/03/06 - 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 ... 08/03/06 - 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 ... 07/20/06 - 20060159206 - Device and method for determining a time of arrival of a receive sequence A device for determining a time of arrival of a receive sequence in a receiver comprises correlation means which is implemented to determine a correlation value sequence from a correlation of the receive sequence with a transmit sequence, wherein the correlation sequence comprises a peak shape having a main maximum ... 07/20/06 - 20060159205 - Device and method for determining a correlation value A device for determining a correlation value from a correlation between a first sequence of values with complex values and a second sequence of values with complex values has a correlation means for determining a first partial correlation value from a correlation between a first subset of the first sequence ... 07/06/06 - 20060146966 - Short and long sequence boundary detection algorithm for wireless lan modems A method for detecting a boundary between two sequences in a wireless local area network is presented that permits rapid detection of the boundary. The method includes provisions for proper operation when significant interference and multi-path can degrade the received transmission significantly. Additionally, when a modification is made to the ... 06/29/06 - 20060140314 - Signal acquisition apparatus and method for reducing false alarm rate A signal acquisition apparatus and method for reducing a false alarm rate are disclosed. The apparatus includes a comparator for detecting a first peak by comparing a correlation value of a received signal with a first threshold and detecting second peaks in a sample interval of the detected first peak ... 06/29/06 - 20060140313 - Error correction decoding, communication apparatus, and digital transmission system An error correction decoding method using a correlating decoding technique is provided. The method includes the steps of estimating a decoding reliability of a decoding result using one or more correlation values acquired in a correlating process; and correcting the decoding result according to the decoding reliability. ... 06/22/06 - 20060133544 - Diversity receiver and diversity reception method A diversity receiver comprises: a control section for generating an antenna selection signal such that a plurality of antennas are sequentially selected on a one-by-one basis; a plurality of correlation sections which correspond to the plurality of antennas on a one-to-one basis, each of the correlation sections determining a correlation ... 06/15/06 - 20060126766 - Correlation apparatus based on symmetry of correlation coefficient and method thereof Provided is a correlation apparatus based on symmetry of a correlation coefficient that can reduce complexity of hardware by reducing the number of adders and multipliers, and a method thereof. The correlation apparatus for correlating a complex correlation coefficient sequence which is symmetrical with respect to a received complex signal ... 06/15/06 - 20060126765 - Apparatus and method for detecting timing error based on cyclic correlation Provided is an apparatus and method for detecting timing errors based on characteristics of cyclic correlation. The apparatus and method can detect the timing errors of many users by using the cyclic characteristics of a midamble code at a time and detects the timing errors based on the characteristics of ... 06/15/06 - 20060126764 - Processing of an ofdm signal The invention relates to an OFDM-transmitter, comprising means for transforming (400) data to be transmitted in frequency-to-time transformation to a basic waveform containing waveform components representing subbands of the spectrum of the signal. The transmitter comprises means for forming (402) at least one alternative waveform from components of the basic ... 06/01/06 - 20060115026 - M-algorithm with prioritized user ordering Performing approximate diagonalization of a correlation metric by user permutation to improve Multiuser Detector (MUD) processing. The system reorders the entries in the S-Matrix in order to move the bit decisions closer together in the decision tree. In one embodiment the reordering is a sequential pairwise correlation. ... 06/01/06 - 20060115025 - Apparatus and method for estimating start of frame Disclosed is an apparatus and method for estimating a start point of a frame in a wireless communication system. The method includes the steps of receiving a frame and estimating the start of the frame by searching for an interval or point of time during or at which a correlation ... 06/01/06 - 20060115024 - Fast walsh transform (fwt) demodulator and method thereof A fast Walsh transform (FWT) demodulator and a method are provided. The FWT demodulator includes a FWT correlator for receiving and transforming a first information based on a FWT method to output third information; power approximation devices (PAD) for receiving and calculating one of the third information to output an ... 05/25/06 - 20060109936 - Non-coherent dp-mok reception process with combination of multiple paths and corresponding receiver Process for non coherent DP-MOK reception with combination of multiple paths and corresponding receiver. According to the invention, demodulation of orthogonal signals (MOK) is combined with a differential phase demodulation (DP) and diversity processing related to multiple paths in the radiofrequency channel. Diversity processing is achieved making use of differential ... 05/18/06 - 20060104393 - Apparatus and method of detection for a packet-based wireless receiver employing multiple, concurrent transmitted streams The present invention provides a packet detector for use with a packet-based wireless receiver employing a receive antenna for P concurrently transmitted streams, where P is at least two. In one embodiment, the packet detector includes a correlation unit coupled to the single receive antenna and configured to provide a ... 05/04/06 - 20060093078 - Preamble aided synchronization The repetitive structure of a preamble signal is exploited to enhance timing synchronization performance and frame start detection performance under adverse channel conditions. Received values are cross-correlated in time against a known noise-free version of the preamble. The presence of peaks in the cross-correlation output indicates presence of a frame. ... 05/04/06 - 20060093077 - Synchronizing method for impulse radio network A method to synchronize impulse radio signal in a receiver based on a cross-correlation between an input signal and a template pulse train is described. The method comprises the steps of receiving a radio signal, performing a correlation between the acquired radio signal and a template pulse train, splitting the ... 05/04/06 - 20060093076 - Apparatus for estimating a frequency offset in a communication system and method thereof An apparatus and method for estimating a frequency offset using a preamble signal having a periodically repeated structure. According to the apparatus and method, the sum of or the difference between an input signal and a delay signal is calculated without obtaining a simple correlation value between the input signal ... 04/27/06 - 20060088133 - Time-frequency correlation-based synchronization for coherent ofdm receiver There is provided an apparatus for synchronizing pilots contained in symbols received by a receiver in a multicarrier transmission system and a method thereof. Time-frequency correlation-based scheme, with exploitation of time-frequency correlation characteristics of the pilots, is used for identifying the positions of the pilots in time and frequency dimensions ... 04/20/06 - 20060083338 - Noncoherent ultra-wideband (uwb) demodulation Techniques are described that provide noncoherent demodulation via correlating “dirty” templates in wireless communication systems. In particular, the described techniques cross-correlate dirty templates that are adjacent symbol-long segments of the received noisy waveform. Unlike transmitted reference (TR) and differential templates that are noisy, i.e., propagate through the wireless communication channel, ... 04/06/06 - 20060072689 - Matched filter and cross correlation method Disclosed is a matched filter and a method for performing cross correlation thereof. The matched filter includes a demultiplexer for demultiplexing an input sample signal into a predetermined number of signals; and cross correlators that perform a cross correlation of each of the demultiplexed sample signals with a predetermined sequence. ... 04/06/06 - 20060072688 - Wireless communication system and method with frequency burst acquisition feature using autocorrelation A wireless communication system is provided that detects a frequency burst (FB) through analysis of the autocorrelation function of received signals. The system can accommodate the relatively large frequency offsets that are associated with less expensive reference frequency crystals. In one embodiment, the system includes FB search hardware that operates ... 03/30/06 - 20060067438 - Detector for clock phase and carrier phase A detector for a receiver generates a clock phase detection signal and a carrier phase detection signal from of a plurality of clock polyphase signals of an oversampled signal. The detector comprises a plurality of carrier phase detectors, a plurality of variance estimation units, a selection unit and an output ... 03/30/06 - 20060067437 - Wireless communication system and method with frequency burst acquisition feature using autocorrelation A wireless communication system is provided that detects a frequency burst (FB) through analysis of the autocorrelation function of received signals. The system can accommodate the relatively large frequency offsets that are associated with less expensive reference frequency crystals. The system employs a multi-mode filter including an FB filter and ... 03/23/06 - 20060062335 - Sync extraction apparatus in communication system and method thereof A synchronization extraction apparatus for a communication system and a method thereof are disclosed. A frame synchronization is obtained in a manner that the sum of an input signal and a delay signal is obtained without obtaining a simple correlation value between the input signal and the delay signal, and ... 03/09/06 - 20060050815 - Apparatus, module and computer program for minimizing correlation between signals An apparatus that comprises means to simultaneously receive a first number of signals and a larger number of signal pathways comprises means to determine the correlation between first said number of signals for each of the possible signal pathways. The apparatus also comprises means to select from said second number ... 01/26/06 - 20060018413 - Coarse timing estimation system and methodology for wireless symbols A system that facilitates obtaining a coarse estimation of a boundary of symbol with respect to time comprises a peak detector that detects a peak energy of an energy distribution output by a correlator, and an estimating component that adaptively estimates a boundary of the symbol based as a function ... 01/12/06 - 20060008036 - Receiving method and receiving apparatus One correlation value is selected with high accuracy from among a plurality of correlation values which have been subjected to Walsh transform. A Fast Walsh Transform (FWT) computing unit performs an FWT computation on CCK-modulated signals and outputs 64 Walsh transform values. A maximum value search unit inputs 64 Walsh ... 01/12/06 - 20060008035 - Payload boundary detection during multiband receiver synchronization Detecting a boundary within a transmitted packet is disclosed. A first symbol of the transmitted packet is received in a band. A second symbol of the transmitted packet is received in the band. The first and second symbols are compared. The boundary within the transmitted packet is detected based at ... 01/12/06 - 20060008034 - Spreading codes for quasisynchronous code division multiple access systems Described herein is a method of generating spreading codes which ensures that the cross-correlation is −1 for all pairs of sequences within the relevant time delays. ... 12/29/05 - 20050286661 - Symbol timing error detector that uses a channel profile of a digital receiver and a method of detecting a symbol timing error A symbol timing error detector and a method of detecting the symbol timing error that uses a channel profile of a digital receiver. The symbol timing error detector includes a non-coherent correlator to calculate a non-coherent correlation value using pseudo noise (PN) sequence in which a received signal is that ... 12/29/05 - 20050286660 - Digital frequency determining apparatus using matched filters Methods and apparatus for determining a dominant frequency contained in a multi-frequency analog signal. An apparatus includes a first matched filter pair and a second a second matched filter pair. Both the first matched filter pair and the second matched filter pair are configured to receive in-phase (I-phase) and quadrature-phase ... 12/22/05 - 20050281359 - Methods and apparatus for signal processing of multi-channel data Methods and apparatuses for processing multi-channel data are provided. A group of input signals are sampled. An average spectrum of the sampled group of input signals sampled over a predetermined number of time intervals is determined. An autocorrelation function based on the average spectrum and an average covariance based on ... 12/22/05 - 20050281358 - Sir estimation in a wireless receiver A method and apparatus for removing bias from an initial signal-to-interference ratio (SIR). In an exemplary embodiment, an initial SIR calculator in an SIR processor calculates the initial SIR based on the signal received by the wireless receiver, while an average SIR calculator in the SIR processor generates an average ... 12/01/05 - 20050265494 - Method and apparatus for code phase tracking A method of code phase tracking for CDMA type communication is disclosed together with apparatus including a GPS receiver (10 to 15) for the same. The method uses a modified early-minus-late correlation function to determine the code phase error between a target pseudorandom noise code of an incoming signal and ... 11/24/05 - 20050259767 - Frequency domain equalization of communication signals A system and method for estimating a channel spectrum. The method includes: (a) receiving an input signal from a channel, where the input signal includes one or more major echoes and zero or more minor echoes introduced by the channel; (b) identifying the one or more major echoes present in ... 11/03/05 - 20050243952 - Methods for processing a received signal in a software defined radio (sdr) system, a transceiver for an sdr system and a receiver for an sdr system A receiver for a software defined radio system comprises an input stage for receiving a transmitted signal, an analogue-to-digital converter having a sample rate, a filter matched to the received transmitted signal, and a sample rate converter for converting the digital signal output from the filter from an input sequence ... 10/27/05 - 20050238123 - Method and system for charge sensing with variable gain, offset compensation, and demodulation Provided are a method and system for digitizing a sensor model output signal. The system includes a filter, a demodulator coupled to the filter, a DC offset cancellation mechanism coupled to the demodulator, and an analog to digital converter (ADC). The ADC is directly coupled to the demodulator and the ... 10/20/05 - 20050232381 - Method for detecting uwb pulse sequences without local pulse generation The invention relates to a method for transmitting at least one sequence of Np pulses over Np time windows, each pulse being enclosed within a predetermined time chip Tc. The method according to the invention includes a signal detection step, in the course of which Np detection windows Dj (for ... 10/20/05 - 20050232380 - Support of the determination of a correlation A method for supporting a determination of the correlation between at least one received code modulated signal and at least one available replica code is shown. In order to reduce the total memory size required for such correlations, the method comprises storing signal samples of the at least one received ... 10/13/05 - 20050226351 - Complementary code keying (cck) sequentially decoding apparatus and process thereof An apparatus of sequentially decoding CCK codes includes a series of received signal registers used to respectively temporarily save the received signals, a phase selector used to select one numeral from 1, −1, j or −j respectively for CCK code of each chip to multiple with the signal register, a ... 10/06/05 - 20050220230 - Carrier detecting method and carrier detecting circuit A carrier detecting circuit in a receiver of a wireless device has a circuit for determining a power value of a received signal, a circuit for determining a correlation value between a preamble included in the received signal and a predetermined preamble pattern which characterizes a communication system to which ... 10/06/05 - 20050220229 - Synchronization acquisition circuit and receiving apparatus using the same A matched filter is provided with a plurality of taps and calculates correlations between a baseband signal and a diagnosis signal series. The matched filter derives the diagnosis signal series, based on the first through fourth preamble patterns that are candidates for a match with a preamble pattern included in ... 10/06/05 - 20050220228 - Accurate signal detection in a wireless environment A method for accurate signal detection begins by receiving a radio frequency signal, which is then converted into baseband signals. The processing then continues by performing a normalized auto correlation on the down-converted baseband signal to produce a normalized auto correlation signal. The process continues by performing a periodic pattern ... 09/29/05 - 20050213691 - Balancing amplitude and phase A system for balancing a signal having I and Q components includes means for cross correlating the I and Q components to produce a cross correlation product; means for adjusting the gain of each I and Q signal component in accordance with said cross correlation product; and means for adding ... 09/15/05 - 20050201496 - Demodulation device and demodulation method The present invention provides a demodulation device including: a synthesizer generating a local signal; and a mixer mixing an input signal, which is modulated by a carrier frequency, with the local signal to output an intermediate frequency signal whose carrier has an intermediate frequency. An intermediate frequency setting unit sets ... 09/08/05 - 20050195926 - Device and method for carrying out correlations in a mobile radio system A device (11) for carrying out a correlation, having a data memory (12) for storage of a sequence of sample values (110), having an address generator (13) for production of addresses for reading a data word (111), in which the sequence of sample values in the data word (111) need ... 09/08/05 - 20050195925 - Process and device for the prediction of noise contained in a received signal Process and device for the prediction of noise contained in a received signal For predicting noise (n) contained in a received signal (u) transmitted via a transmission channel (2), it is proposed that the autocorrelation function of the received signal (u) is obtained in order to determine noise estimated values ... 09/08/05 - 20050195924 - Method and system for predicting signal power to interference metric In the method, a signal power to interference metric for a communication channel in a coverage area of a phase sweep diversity communication system is predicted based on a sweep frequency for transmissions in the coverage area. ... 08/25/05 - 20050185741 - Method and apparatus for a parallel correlator and applications thereof A fast correlator transform (FCT) algorithm and methods and systems for implementing same, correlate an encoded data word (X0-XM-1) with encoding coefficients (C0-CM-1), wherein each of (X0-XM-1) is represented by one or more bits and each said coefficient is represented by one or more bits, wherein each coefficient has k ... 08/18/05 - 20050180531 - Device for estimating a sequence of n bits corresponding to a received sequence of m digital data and associated method A system and method is provided for estimating a sequence of N bits ({circumflex over (x)}0{circumflex over (x)}1 . . . {circumflex over (x)}N−1) corresponding to a received sequence of M digital data (r0r1 . . . rM−1). The method includes determining candidate sequences of MRS digital data from a ... 08/11/05 - 20050175126 - Channel estimation apparatus and method in digital communication system A channel estimation apparatus in a digital communication system is disclosed, which includes: a correlation unit for obtaining a correlation function of a first received signal by means of a correlation between a received synchronizing signal and a reference synchronizing signal, and obtaining a correlation function of the received synchronizing ... 08/04/05 - 20050169408 - Coarse frequency synchronization method and apparatus in an orthogonal frequency division multiplexing (ofdm) system An apparatus and method for performing coarse frequency synchronization in an orthogonal frequency division multiplexing (OFDM) receiver includes cyclically shifting a received signal X(k) by a predetermined shift amount d, determining the length of a summation interval according to a phase coherence bandwidth and a number K of sub-bands into ... 08/04/05 - 20050169407 - Receiver circuit and a method for its operation A receiver circuit having at least one amplifier device for amplification of a data signal which is applied to the input side of the receiver circuit, and having a control device which measures the data rate of the data signal and sets the bandwidth of the amplifier device such that ... 07/28/05 - 20050163265 - Timing estimation in an ofdm receiver A timing estimation system and methodology are provided. In particular, a first pilot is employed in conjunction with three acquisition stages. In the first stage, an attempt is made to observe the leading edge of the correlation curve associated with the first pilot symbol. In the second stage, a determination ... 07/28/05 - 20050163264 - Correlator and receiving apparatus utilizing the same I delay units and Q delay units continuously delay values of in-phase component and quadrature component of an inputted first baseband received signal. I storage units and Q storage units store each component of a waveform of STS (Short Training Sequence) corresponding to a first transmitting antenna. Multipliers carry out ... 07/28/05 - 20050163263 - Systems and methods for frequency acquisition in a wireless communication network The disclosed embodiments provide for methods and systems for initial frequency acquisition in a wireless communication network. In one aspect, a method for initial frequency acquisition includes the acts of receiving a stream of input samples from a transmitter, determining an estimate for a frequency offset associated with the transmitter ... 07/28/05 - 20050163262 - Frame synchronization and initial symbol timing acquisition system and method A robust initial frame detection and symbol synchronization system and methodology are provided. In particular, a first pilot is employed in conjunction with three acquisition stages. In the first stage, an attempt is made to observe the leading edge of the correlation curve associated with the first pilot symbol. In ... 07/28/05 - 20050163261 - Timing-adjusting method and apparatus, and diversity receivign method and apparatus An A-D conversion unit performs analog-to-digital conversions on baseband signals. A correlation processing unit carries out a correlation processing. A power computing unit computes the power of correlation values. An inter-signal condition determining unit compares a relationship between the peak of a main signal and the peak of sub-signals to ... 07/14/05 - 20050152480 - Apparatus and method for estimating interference and noise in a communication system A method and apparatus for estimating interference and noise power in an orthogonal frequency division multiplexing/orthogonal frequency division multiple access/discrete multi-tone (OFDM/OFDMA/DMT) system is disclosed. A correlator correlates a plurality of sub-carriers with a preset reference sequence on an element-by-element basis and outputs a result of the correlation. A signal ... 07/07/05 - 20050147190 - Signal processing circuit and quadrature demodulation apparatus and method of estimating error thereof To provide a signal processing circuit which makes it possible to accurately estimate not only amplitude error but also phase error of a signal caused by device characteristics of components of a receiver, correct swiftly the error component without providing feedback control, and eliminate signal deterioration. This signal processing circuit ... 06/30/05 - 20050141654 - Apparatus for compensating phase of receiver and method thereof The present invention provides an apparatus for compensating a phase difference of a receiver, the apparatus including: an accumulating unit for accumulating a radio frequency (RF) input signal and generating an accumulated RF signal in order to minimize an effect of a background noise of the RF input signal; a ... 06/23/05 - 20050135511 - Method and apparatus for demodulating a received signal within a coded system A receiver (100) includes an input, a correlator (112), a phase-assisted demodulator (116), and an output. The input receives a modulated signal (102) and the correlator (112) generates a plurality of correlation values (114) from the received modulated signal (102). The phase-assisted demodulator (116), coupled to the correlator (112), selects ... 06/16/05 - 20050129149 - Detecting gsm downlink signal frequency correction burst A method of detecting in a GSM downlink signal a frequency correction burst signal uses a correlation technique that is insensitive to the amount of frequency offset from a nominal carrier frequency. Instead of using a constant reference vector as a reference signal, a delayed version of the downlink signal ... 06/02/05 - 20050117675 - Method and apparatus for providing random access detection in a communication system The disclosed embodiments relate to a communication system and method. The system may comprise a pre-whitening device that applies pre-whitening data to a received signal from an antenna array to produce a pre-whitened signal, at least one detector that is adapted to recognize a pattern corresponding to a request for ... ### FreshPatents.com Support |