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Pulse Or Digital Communications > Receivers > Angle Modulation > Particular Demodulator > Carrier Recovery Circuit Or Carrier Tracking Carrier Recovery Circuit Or Carrier TrackingCarrier Recovery Circuit Or Carrier Tracking 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.11/01/07 - 20070253512 - Method for acquiring timing and carrier synchronization of offset-qpsk modulated signals Embodiments of the invention consist in a method of carrier synchronization, comprising determining a frequency offset estimate from a rate of change of a phase difference between a local oscillator signal and a carrier signal of a received signal; and adjusting a frequency of the local oscillator signal by the ... 10/18/07 - 20070242778 - Clock recovery circuit A clock recovery circuit comprising an initial delay select circuit, a delay locked loop and a clock synthesizer circuit is provided. The initial delay select circuit comprises an initial timing generator, a first multiplexer and an initial value generator. The delay locked loop comprises a delay chain, a phase detector, ... 08/16/07 - 20070189420 - Limiter based analog demodulator A limiter based analog demodulator includes a power amplifier receiving a base-band signal and a local clock operating at the base-band frequency. A first multiplier receives an output from the power amplifier and the local clock to provide an in phase signal. A quadrature phase shifter receives the local clock ... 08/02/07 - 20070177692 - Receiver having dc offset voltage correction A receiver comprises a frequency down-conversion stage (14) for demodulating a received signal to produce an uncorrected demodulated signal (vin ), a dc offset voltage correcting circuit (22) having an output (28) for a corrected signal and a data recovery circuit (42) coupled to the output. The dc offset voltage ... 07/26/07 - 20070172003 - Dtv receiver and method of processing a broadcast signal in dtv receiver A DTV receiver includes a tuner, an information detector, a demodulator, and a channel equalizer. The tuner receives a broadcast signal including valid data in which a known data sequence is periodically repeated. The information detector detects location information of the known data sequence and a coarse frequency offset value ... 07/26/07 - 20070172001 - Demodulation circuit and demodulation method A demodulation circuit according to the present invention comprises an automatic equalizer for carrying out equalization processing of a signal, a carrier recovery circuit for carrying out carrier recovery processing based on an equalized signal by the automatic equalizer. A center tap for carrying out an amplitude control of the ... 07/12/07 - 20070160169 - Demodulation apparatus and receiving apparatus A demodulation apparatus that can support various oscillation frequencies. The portable phone device includes a frequency synthesizer for generating a local-oscillation signal having a local oscillation frequency for converting the frequency of an input receiving signal into an intermediate frequency based on an oscillation signal generated by an TCXO and ... 07/12/07 - 20070160168 - Apparatus and method for signal phase control in an integrated radio circuit An apparatus and method to control signal phase in a radio device includes a phase rotator configured to control a phase of a local oscillator. A phase error determination module is configured to determine phase error information based on received in-phase (I) and quadrature (Q) (IQ) signal values. A phase ... 07/05/07 - 20070153939 - Method of differential-phase/absolute-amplitude qam A method of quadrature amplitude modulation involving encoding phase differentially and amplitude absolutely, allowing for a high data rate and spectral efficiency in data transmission and other communication applications, and allowing for amplitude scaling to facilitate data recovery; amplitude scale tracking to track-out rapid and severe scale variations and facilitate ... 06/28/07 - 20070147546 - Digital radio apparatus The present invention provides a digital radio apparatus in which heat dissipation can effectively be performed in the apparatus without providing a heat dissipation duct in a shared unit and downsizing of the apparatus can be realized. In a digital radio apparatus installed inside a building, each circuit in a ... 06/07/07 - 20070127599 - Apparatus and method for phase recovery and i/q imbalance compensation in quadrature demodulating receiver An apparatus and method for phase recovery and I/O imbalance compensation in a quadrature demodulating receiver are provided. The apparatus includes: a phase error compensating unit for compensating a phase error for a reference channel which is one of the I channel and the Q channel; and a phase imbalance ... 06/07/07 - 20070127598 - Dtv receiver and method of processing signal in dtv receiver A DTV receiver includes a tuner, a demodulator, a channel equalizer, a sequence detector, and a burst controller. The tuner receives a DTV signal having main data and at least one burst of enhanced data. The demodulator demodulates the DTV signal by performing carrier and time recovery and the channel ... 05/24/07 - 20070116152 - Adaptive coding and modulation queuing methods and devices A process is described to build physical layer frames with a modcode adapted to the signal quality of a destination terminal. Data packets assigned to the same modcode may be sent in the same frame, although packets associated with higher modcodes may be used to complete a frame before switching ... 05/24/07 - 20070116151 - Adaptive coding and modulation for broadband data transmission A process is described to build physical layer frames with a modcode adapted to the signal quality of a destination terminal. Data packets assigned to the same modcode may be sent in the same frame, although packets associated with higher modcodes may be used to complete a frame before switching ... 05/03/07 - 20070098114 - Detection of large carrier offsets using a timing loop A method and apparatus for the detection and correction of large carrier offsets. A set of known correction carrier offsets are used to translate an input signal having a carrier offset. After applying each correction carrier offset, a state of a timing recovery loop is evaluated. The set of known ... 04/05/07 - 20070076821 - Vector waveform correction device A vector waveform correction device corrects a vector waveform displayed on a vector scope. A first color difference signal and a second color difference signal demodulated from a chrominance signal of a composite video signal are input as x and y, and a vector (x, y) is partially rotated in ... 03/22/07 - 20070064836 - Format efficient timing acquisition for magnetic recording read channels A timing recovery circuit for magnetic recording applications that use preamble synchronization bits. The timing recovery circuit uses a modified digital phase lock loop having a digital rotator. An analog to digital converter (ADC) receives an analog input and provides ADC digital samples to the digital rotator. In order to ... 03/01/07 - 20070047671 - Frequency tracking and channel estimation in orthogonal frequency division multiplexing systems A mechanism for frequency tracking and channel estimation in multi-carrier systems. First, two training symbols are pre-compensated for an effect of frequency offset. Then an average of the two pre-compensated symbols is calculated. Meanwhile, a correlation between the two pre-compensated second symbols is evaluated by performing a differential operation. By ... 01/11/07 - 20070009066 - Multiphase clock recovery The invention represents a parallel and distributed approach to clock recovery based on multiple mutually phase shifted sample clock signals (åS) defining a set of orthogonal clock phases. The phase shifted clock signals are used for obtaining an input data sample representation (åU). Input data transition detection is accomplished by ... 11/16/06 - 20060256894 - Frequency offset compensation in radio receiver A solution for estimating frequency offset in a radio telecommunication system is provided. According to the solution, an estimate for frequency offset between a radio frequency carrier wave of a received signal and frequency of a local oscillator used for downconverting the received signal in a receiver is calculated by ... 11/02/06 - 20060245522 - Method and apparatus for adjusting symbol timing and/or symbol positioning of a receive burst of data within a radio receiver A method and apparatus for adjusting symbol timing and/or symbol interval range of a receive burst of data within a radio receiver include processing that begins by receiving a radio frequency signal that includes bursts of data. The process then continues by determining a frequency offset for the burst of ... 09/21/06 - 20060209989 - System and method for clock recovery in digital video communication A system for clock recovery in digital video communication includes a delay measurement block for generating PCR input signals and for continuously determining the time interval between successive PCR input signals. The system also includes a first storage device for generating a first PCR signal corresponding to the time interval ... 08/31/06 - 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 ... 08/03/06 - 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 ... 07/27/06 - 20060165197 - Synchronous follow-up device and method A replica generation section 103 performs multicarrier demodulation of a known signal of a received signal and generates a replica. A delay profile generation section 104 calculates a correlation value between the replica and the received signal and generates a delay profile. An integral value calculation section 105 integrates the ... 06/29/06 - 20060140309 - Clock and data recovery circuits A clock and data recovery circuit comprising a phase detection circuit, first and second oscillators, and a flip-flop. The phase detection circuit outputs a detection signal according to a significant transition of an input signal. Each oscillator receives the detection signal and operates alternately in a clock and data recovery ... 06/29/06 - 20060140308 - Carrier tracking circuit and method including dual numerically controlled oscillators and feedforward phase correction coefficient A carrier tracking circuit includes a first phase adjustment circuit coupled to an input of a delay element and a second phase adjustment circuit coupled to an output of the delay element. A phase correction circuit is coupled to output of the delay element is operable to generate a phase ... 04/13/06 - 20060078072 - Synchronization signal detection circuit and method of digital television (dtv) receiver A synchronization signal detection circuit and method of a digital TV (DTV) receiver are provided. The synchronization signal detection circuit determines a precise main path by determining powers in consideration of the influence of multiple paths near signals located at a peak value location and guarantees a stable operation of ... 04/13/06 - 20060078071 - Carrier and symbol timing recovery apparatus usable with a vestigial side band receiver and recovery method thereof A carrier and symbol timing recovery apparatus usable in a VSB (Vestigial Side Band) receiver, and a method thereof. For a carrier and symbol timing recovery, error information is detected using a pilot signal, an upper sideband and a lower sideband of a received signal. Each of the detected error ... 04/13/06 - 20060078070 - Carrier phase and symbol timing recovery circuit for an atsc receiver and method of recovering a carrier phase and a symbol timing in received digital signal data A carrier phase and symbol timing recovery circuit and method may be used for robust synchronization in a broadcasting ATSC receiving system. Carrier phase and symbol timing offsets may be simultaneously adjusted by using redundancy information contained in an ATSC signal spectrum. A desired sampling time instant and carrier phase ... 04/06/06 - 20060072686 - Method and circuit arrangement for suppressing an orthogonal perturbation The invention relates to a method as well as a circuit arrangement for suppression of a perturbing quadrature component of a carrier signal of an amplitude-modulated signal during the recovery of the carrier signal in a synchronous demodulator, which outputs a quadrature signal (Q). The perturbing quadrature component of the ... 03/30/06 - 20060067432 - Frame-based carrier frequency and phase recovery system and method Header information is used to facilitate coarse frequency and frame recovery. The coarse frequency and frame recovery is thereafter utilized to perform adaptive phase and frequency synchronization on a frame-by-frame basis. ... 03/30/06 - 20060067431 - Circuit and method for recovering a carrier The invention relates to recovering a carrier for a synchronous demodulator, that receives an input signal. A carrier is reconstructed for the provided input signal, and the input signal (in) and carrier (tr) are mixed to generate a mixed signal to be outputted (i, q), wherein a residual phase error ... 03/23/06 - 20060062331 - Demodulator for use in wireless communications and receiver, method and terminal using it A demodulator (100), includes an input signal path (101) for delivering an RF input signal, a local oscillator (111), connected to the input signal path a first mixer (107) for mixing an output reference signal from the local oscillator with an RF input signal to produce an in-phase component of ... 03/02/06 - 20060045210 - Symbol timing recovery apparatus used with a vsb-type receiver and a method of using the same A symbol timing recovery apparatus used with a VSB-type receiver and a method of the same. In order for the symbol timing recovery, error information is generated and used utilizing a band edge component maximization (BECM) of a frequency band as well as an upper frequency band. Therefore, the symbol ... 03/02/06 - 20060045209 - Carrier recovery apparatus usable with vsb type receiver and method thereof A carrier recovery apparatus usable with a VSB receiver and a method thereof. The carrier recovery apparatus is capable of recovering a carrier even though a pilot signal may be corrupted due to multi-path characteristics of a channel. Accordingly, the carrier recovery apparatus performs a BECM (Band Edge Component Maximization) ... 03/02/06 - 20060045208 - Transmission distinguishing apparatus, systems, and methods Apparatus and systems, as well as methods and articles, may operate to distinguish between sources of signals transmitted with a pilot carrier based upon a variance in a peak-to-peak amplitude of a sum of a received pilot carrier and a delayed received pilot carrier. ... 02/23/06 - 20060039507 - Method and apparatus for estimating sfo in digital receiver, and method and apparatus for compensating for sampling frequency using the estimated sfo in the digital receiver A sampling frequency offset (SFO) estimation method for use in a digital receiver to estimate a correct SFO is disclosed. The method for estimating the SFO in the digital receiver includes the steps of (a) receiving an estimated phase, and comparing a magnitude of the estimated phase with that of ... 02/16/06 - 20060034395 - Dual loop clock recovery circuit A clock recovery circuit for digital data transmission includes a delay lock loop having a first loop which generates a phase difference signal which is indicative of a quantized phase difference between a data signal and a clock signal; and a second loop which generates a phase difference signal which ... 02/16/06 - 20060034394 - Circuit for adaptive sampling edge position control and a method therefor A clock and data recovery circuit (CDR) for receiving high-speed digital data, and having an analog phase offset control capability, is improved by providing an adaptive sampling edge position control. A differential circuit samples the raw data signal at three closely spaced sampling points of the eye, and compares advanced ... 02/09/06 - 20060029160 - Quarter-rate clock recovery circuit and clock recovering method using the same A quarter-rate clock recovery circuit includes a clock generator, a phase interpolation unit, a phase detector, and a controller. The clock generator generates first through fourth clocks having a quarter frequency of a data-rate of input data, the second, third and fourth clocks have phase differences of 90, 180, and ... 02/02/06 - 20060023812 - Providing correction for carrier frequency offset in multi-carrier communication systems A receiver device provided according to an aspect of present invention accurately recovers streams of symbols encoded in corresponding sub-channels of a multi-carrier signal. Such a feature is attained by first recovering erroneous symbols (which are not yet corrected for carrier frequency offset) from the sub-channels, and then processing the ... 02/02/06 - 20060023811 - Digital i/q demodulator suitable for use in wireless networks and an associated method of demodulating an rf signal A digital in-phase/quadrature (I/Q) demodulator for use in RF receivers, wireless base stations, wireless mobile stations and other components of wireless networks. The digital I/Q demodulator extracts and resolves I and Q components of a demodulated digital data signal from a modulated digital data signal input thereto. The digital I/Q ... 02/02/06 - 20060023810 - Carrier recovery system and method thereof A carrier recovery system includes an in-phase mixer for mixing an incoming signal with an in-phase reference signal to produce an in-phase baseband signal; a quadrature-phase mixer for mixing the incoming signal with a quadrature-phase reference signal to produce a quadrature-phase baseband signal; a DC detector for measuring a DC ... 01/26/06 - 20060018409 - Digital television receiver and method of recovering incoming digital television signal A digital television receiver includes a tuner for down-converting an incoming signal to produce a down-converted signal according to a local oscillator signal corresponding to a selected channel. A filter is coupled to the tuner for filtering the down-converted signal to produce an intermediate frequency (IF) signal. A carrier recovery ... 12/15/05 - 20050276354 - Iq imbalance compensation The present invention discloses a method and apparatus of IQ imbalance compensation for a receiver. The repetitive attribute of the preamble in a signal received by the receiver is used to estimate the IQ imbalance parameters. The data carried by the preamble repeats itself every N sampling intervals. A MSE ... 12/01/05 - 20050265487 - Method of sampling data and a circuit for sampling data The present invention relates to a method of sampling a received digital data stream. The method comprises: generating a first sampling clock in dependence on a detected rate of said received digital data stream for sampling at a first time within a bit period of said received digital data stream; ... 12/01/05 - 20050265486 - Selecting clock frequencies for baseband devices Various embodiments of the present invention include methods and apparatus for receiving a radio frequency (RF) signal spectrum in a receiver; mixing the RF signal spectrum with a first local oscillator (LO) frequency to obtain a first downmixed signal; and converting the first downmixed signal to a first digital signal ... 11/17/05 - 20050254601 - Channel acquisition processing for a television receiver Channel acquisition in a digital television signal receiver is improved by determining the carrier tracking loop frequency offsets and the symbol timing recovery offsets for each channel in the television receiver. Offsets are stored in respective EEPROMs for each channel. When a channel is to be acquired in the TV ... 11/10/05 - 20050249315 - Method and system for transmitting isochronous voice in a wireless network In one aspect the present invention describes an electronic circuit for transmitting voice packet data over a wireless network with an upstream transmission mode and a downstream transmission mode. The circuit comprises a first phase-lock loop (PLL) for locking a first clock to a time stamp signal, wherein the first ... 11/03/05 - 20050243950 - Spectral jitter analysis A plurality of error values are determined for providing a jitter analysis for a digital signal having transitions between logical levels. Each error value is associated with one of a plurality of successive timing points, and is derived from a comparison of a result of a detection for a transition ... 09/22/05 - 20050207514 - Carrier wave production apparatus A carrier recovery apparatus capable of detecting a phase error of modulation signal by a simple calculation, reducing the circuit scale, and improving the frequency capture characteristic and phase jitter characteristic is presented. This carrier recovery apparatus comprises a symbol estimating unit for estimating the transmitted symbol, a phase error ... 09/15/05 - 20050201491 - System and method for selecting optimal data transition types for clock and data recovery A clock recovery circuit samples an incoming data stream that includes sequences of signal transitions. A transition detector categorizes the received signal transitions into various types, such as those associated with 2PAM and 4PAM signaling schemes. Select logic control circuitry analyzes the signal-transition types to determine which of the transition ... 07/21/05 - 20050157821 - Apparatus and method for carrier acquisition of vestigial sideband (vsb) signal A method for demodulating a carrier wave in a channel environment in which a pilot signal may be distorted, in a digital TV receiver, which may receive a vestigial sideband (VSB) modulated and transmitted signal, and a demodulation apparatus therefor are provided. A field synchronization part of a VSB signal, ... 07/21/05 - 20050157820 - Digital receiver having adaptive carrier recovery circuit A digital receiver, that may be used to receive VSB/QAM digital television signals, includes an adaptive fine carrier recovery circuit that compensates for deviations in the carrier frequency or phase. The carrier recovery circuit de-rotates a signal including phase errors. Estimations of phase errors are filtered using a filter whose ... 07/07/05 - 20050147188 - Frequency control for a mobile communications device A mobile station in a TDMA network can perform automatic frequency using burst in all or any slot in a control channel. This is achieved by identifying the training sequence of an arbitrary set of or all received bursts. ... 06/30/05 - 20050141647 - Receiving method and receiving apparatus An antenna selector selects one antenna during an interval of control signal. A receiving weight vector computing unit computes receiving weight vectors. During an interval of data signal, a multiplier in a signal processing unit weights digital received signals with the receiving weight vectors so as to output composite signals. ... 06/30/05 - 20050141646 - Carrier recovery apparatus and digital broadcast receiver using the same Provided is a carrier recovery apparatus of an OOB QPSK receiver for an Open Cable System. The carrier recovery apparatus of the digital broadcast receiver includes a carrier recovery, an SNR calculator, a false lock generator, and an integrator. The carrier recovery receives a digital broadcast signal, multiplies the signal ... 06/30/05 - 20050141645 - Vsb receiver and carrier recovery apparatus thereof There are provided a VSB receiver and a carrier recovery apparatus thereof, in which a carrier is recovered using a VSB modulated signal. In the VSB receiver, a digital processing part selects a desired channel frequency through an antenna, converts the channel frequency into an intermediate frequency, and digitalizes the ... 06/23/05 - 20050135508 - Carrier recovery apparatus and broadcasting receiver using the same Provided is a carrier recovery apparatus in a vestigial sideband modulation (VSB) type digital television (DTV) receiver. The carrier recovery apparatus dynamically controls a sign determination level which is a reference for determining a sign of an I signal in a sign extractor. Therefore, the carrier recover apparatus can eliminate ... 06/16/05 - 20050129148 - Control algorithm in qam modems A method and apparatus for automated acquisition of a QAM signal. The method employs an embedded state machine progressing from an initial state to a final state. The method comprises the following steps: (A) Performing an automatic gain control (AGC) operation on the incoming QAM signal to maintain a steady ... 06/09/05 - 20050123073 - Process for providing a pilot aided phase recovery of a carrier from said phase trajectories calculating a phase correction (e−j{circumflex over (θ)}(ks)). ... ### FreshPatents.com Support - Terms & Conditions |