|
Match
|
Document |
Document Title |
|
|
7613254 |
Phase detector for comparing phases of data and a plurality of clocks
A phase detector that compares the phases of data and four-phase first to fourth clocks having a half rate of the data and being 90° out of phase with one another. Exemplary embodiments of the...
|
|
|
7613253 |
Noise balanced QAM detection
A method of demodulating digital data using M'ary QAM has been disclosed, comprising the steps of detecting a complex symbol vector D, establishing within which reference symbol boundaries the...
|
|
|
7606332 |
Variable signal delaying circuit, quadrature frequency converter and radio frequency tuner
A variable signal delaying circuit comprising an analog delay line having a control input for controlling the variable delay. A phase detector compares the input and output signals of the delaying...
|
|
|
7599452 |
Method and system for applying Viterbi type PSK demodulation for optimum correlation of GPS signals
A method and system of improving sensitivity in the demodulation of a received signal over an arbitrary measurement time epoch, the method comprising the steps of: correlating the received signal...
|
|
|
7583759 |
Baseband time-domain communications method
A communications system reduces downconverter inaccuracies in time-domain measurements or samples of received microwave communications I and Q complex signals by converting received signal to...
|
|
|
7573943 |
Interference cancellation system
A DSL or other communication system includes a modem or other communication device having at least one antenna that is configured to collect interference data relating to interference noise...
|
|
|
7545889 |
Blocker performance in a radio receiver
Configuring a multiple stage band pass filter of a radio frequency receiver commences by setting a corner of a low pass mixer output filter that receives a down sampled analog information signal....
|
|
|
7529534 |
Signal converter for converting a start signal to an end signal and method for converting a start signal to an end signal
A signal converter for converting a start signal into an end signal includes means for copying the start signal to obtain a plurality of copied start signals, wherein a copied start signal may be...
|
|
|
RE40695 |
Clock phase detecting circuit and clock regenerating circuit each arranged in receiving unit of multiplex radio equipment
The present invention relates to a clock phase detecting circuit and a clock regenerating circuit each arranged in a receiving unit of multiplex radio equipment. The receiving unit of the multiplex...
|
|
|
7492838 |
Apparatus for compensating for phase mismatch in QPSK demodulator
An apparatus for compensating for a phase mismatch in a Quadrature Phase Shift Keying (QPSK) demodulator that includes a phase mismatch extractor module for generating a signal including a phase...
|
|
|
7492835 |
Synchrodyning apparatus
Synchrodyning apparatus in which a PAM IF signal is mixed with unmodulated carriers nominally at the frequency of the carrier, which unmodulated carriers are in quadrature with respect to each...
|
|
|
7483498 |
Frequency content separation using complex frequency shifting converters
A frequency separating system is described utilising tuneable frequency shifting complex converters in which the centre frequency of the band extracted and the bandwidth extracted can be varied...
|
|
|
7480351 |
Technique for demodulating level II hierarchical data
A technique for demodulating secondary data from a hierarchically modulated signal includes a number of steps. A gray coded eight phase shift key (8-PSK) hierarchically modulated signal is received...
|
|
|
7477879 |
Transceiver system with common receiver and transmitter oscillator
A transceiver system including a common receiver and transmitter oscillator. The transceiver system may include transmitter circuitry, receiver circuitry, and a first oscillator. The first...
|
|
|
7477708 |
Modes of operations in QAM modems
The method of selecting an optimum mode of operation of the QAM modem comprising (A) using a host interface to select a pair of states, the first state being an initial state; the second state...
|
|
|
7471134 |
Mixer with clock resynchronization and method therefor
A mixer ( 114 ) includes a phase clock generator ( 404 ), a latch ( 420 ), and a multiplier ( 118 ). The phase clock generator ( 404 ) provides a plurality of phase clock signals. The latch ( 420 )...
|
|
|
7469022 |
Methods and apparatus for symmetrical phase-shift keying
Methods and apparatuses employing symmetrical phase-shift keying (SPSK) for data modulation and demodulation. Each symbol in a transmission signal carries n-bit information and is transmitted with...
|
|
|
7411931 |
Inter-frequency measurements with MIMO terminals
The invention is a terminal, system and method for providing inter-frequency and inter-system handovers. A terminal 20 ′ in accordance with the invention includes at least one radio transceiver...
|
|
|
7376208 |
Reception method for packetized information with automatic repeat request
A decoding method is carried out in a receiver configured to accept format information relating to sequences of input data, to use format information in the decoding of each input sequence, and to...
|
|
|
7336731 |
Demodulator with phase-adjusting function
A demodulator with a phase-adjusting function including a detector including a delay detector delaying an input signal in delaying stages using a first clock obtained by frequency-dividing a...
|
|
|
7327808 |
Pipelined adaptive decision feedback equalizer
A pipelined adaptive decision feedback equalizer (DFE). The pipelined ADFE comprises a pre-processing unit, an adder, a feedback filter (FBF), a slicer, a delay unit, a weight-update block and a...
|
|
|
7321641 |
Baseband time-domain communications system
A communications system reduces downconverter inaccuracies in time-domain measurements or samples of received microwave communications I and Q complex signals by converting received signal to...
|
|
|
RE39983 |
Carrier injecting waveform-based modulation scheme for reducing satellite transponder power requirements and earth terminal antenna size
A QPSK modulation scheme uses a data spreading mechanism to rob a relatively limited portion of available transmitter power, and inject into the QPSK waveform a prescribed amount of carrier signal...
|
|
|
7292655 |
Apparatus and method and decoding biphase signals
A technique of decoding a biphase signal comprises sampling the biphase signal to obtain phase sample values and sampling the biphase signal to obtain magnitude sample values. A first digital...
|
|
|
7292653 |
Carrier lock detector
A carrier lock detector for a QPSK or 4-QAM system implements a lock detection algorithm that maps detected signals onto one of first and second areas associated with nominal states defined by (I 2...
|
|
|
7283593 |
Distance determinations associated with a trellis decoder
According to some embodiments, distances associated with a Trellis decoder are determined.
|
|
|
7277504 |
Method and system for concurrent estimation of frequency offset and modulation index
A system for estimating the modulation index and frequency offset of a CPM signal. An estimator filters the received signal and utilizes a training sequence to determine the modulation index and...
|
|
|
7254189 |
Blind carrier offset detection for quadrature modulated digital communication systems
A system and method for estimating the frequency offset experienced between carrier and local oscillator frequencies in communication systems using quadrature modulation. The invention exploits the...
|
|
|
7251295 |
Apparatus for recovering carrier
An apparatus for recovering a carrier is disclosed, for recovering a carrier correctly even though ghost exists in a signal received in a television, which includes a signal converter outputting...
|
|
|
7221719 |
Apparatus and method for receiving BS digital broadcast
An improved apparatus for receiving BS digital broadcast is disclosed. The apparatus for receiving BS digital broadcast of the present invention has first to third filters and a selective complex...
|
|
|
7215939 |
Apparatus and method for detecting ripples caused by multipath propagation and controlling receiving antenna and tuner
Improved signal reception is provided in a digital television signal received by identifying and mitigating multipath signal effects prior to demodulation and equalization. According to an...
|
|
|
7203253 |
Method and apparatus of cross-correlation
Briefly, a method and apparatus to calculate cross-correlation values of complex binary sequences are provided. The apparatus may include a transformation unit and a cross-correlator. The...
|
|
|
7197091 |
Direct conversion receiver with direct current offset correction circuitry
A direct conversion circuit that includes an in-phase and quadrature-phase feedback path that reduces Direct Current (DC) offset. Each feedback path includes a compensating mixer that generates an...
|
|
|
7184740 |
Direct conversion receiver for calibrating phase and gain mismatch
A direct conversion receiver (DCR) calibrated for phase and gain mismatch is provided. The DCR comprises a poly-phase filter that generates mismatched in-phase and quadrature-phase differential...
|
|
|
7161975 |
Enhancing CDMA multiuser detection by constraining soft decisions
A method for multi-user detection includes receiving a complex input signal due to a superposition of waveforms encoding symbols in a constellation of fixed magnitude and variable phase, which...
|
|
|
7082172 |
Digital signal gating apparatus and method in a pulse receiver system
A digital signal gating method and apparatus of a preprocessor in a detection system wherein the detection system includes a central processing unit, a main memory and a receiver, whereby the...
|
|
|
7062228 |
Cellular communications system using baseband carrier injection and related methods
A cellular communications system may include one or more cellular base stations and a plurality of mobile cellular communications devices for communicating therewith. More particularly, the...
|
|
|
7061997 |
Method and apparatus for fine frequency synchronization in multi-carrier demodulation systems
A method and an apparatus relating to a fine frequency synchronization compensating for a carrier frequency deviation from an oscillator frequency in a multi-carrier demodulation system of the type...
|
|
|
7042957 |
Method and communication system for transmitting information with the aid of a multicarrier method
To transmit information with the aid of a transmit signal exhibiting a number of frequency-specific subcarriers from a first unit to a second unit via a transmission medium, the frequency-selective...
|
|
|
7039130 |
RF receiver phase correction circuit using cordic and vector averaging functions and method of operation
A phase tracking circuit for use in a receiver having a raw in-phase (I) signal and a raw quadrature (Q) signal, where the raw I and Q signals have M discrete signal levels defining an M×M...
|
|
|
7027502 |
Run-time coefficient generation for digital filter with slewing bandwidth
A method for slewing a bandwidth characteristic of a digital filter within a range between a first bandwidth characteristic and a second bandwidth characteristic. The digital filter includes a...
|
|
|
7020185 |
Method and apparatus for determining channel conditions in a communication system
One example of symbol or bit error probability estimation in a communication system using soft decision information determines soft decision metric(s) for each symbol that is received over a...
|
|
|
6977972 |
Method of hybrid soft/hard decision demodulation of signals with multilevel modulation
The performance of forward error correction decoders for digital communication systems can be improved if soft information relating the reliability of the value representing the demodulated signal...
|
|
|
6922451 |
Frequency shifting circuit and method
This invention is regarding a frequency shifting circuit suitable for a digital demodulator in a multi-carrier communications system. After converting analog signal vectors to the input signal...
|
|
|
6904104 |
Technique for demodulating a linear modulated data signal in a communications system
A receiver section recovers the in-phase and quadrature components of a linear modulated data signal. The in-phase signal is sampled and quantized producing an in-phase sample stream, and the...
|
|
|
6895060 |
Adaptive weighting method for orthogonal frequency division multiplexed soft symbols using channel state information estimates
A method for weighting orthogonal frequency division multiplexed soft symbols is provided, including the steps of receiving a plurality of sub-carriers modulated by digital information and...
|
|
|
6865217 |
Method for simultaneously receiving and processing multiple channels of data
A method for simultaneously receiving and processing multiple channels of data at independent rates which share a same frequency spectrum begins with receiving a multichannel data communication...
|
|
|
6778614 |
Complex baseband envelope computation
An apparatus for and a method of determining the envelope of a complex baseband signal having an in-phase component I and a quadrature component Q by determining (I 2 +Q 2 ) ½ for sampled values...
|
|
|
6707860 |
DC offset correction for direct-conversion receiver
A method and offset removing apparatus for removing DC offset from a digital baseband signal value pair included in a set of digital baseband signal value pairs is described. The digital baseband...
|
|
|
6693980 |
Wideband fast-hopping receiver front-end and mixing method
A wideband fast-hopping receiver front-end uses direct digital synthesis (DDS) to provide quadrature LO signals to the front-end's mixers. A DDS circuit stores multiple digital word sequences which...
|