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7619466 |
Quadrature demodulator
A quadrature demodulator includes a reception section which receives a signal transmitted by an RFID tag and containing a specific pattern and data following the specific pattern and multiplies the...
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7609784 |
Signal decoding method and apparatus with dynamic noise threshold
An apparatus and method for use by a receiver in decoding information sent by phase-shift keying over a carrier frequency for use with power line carrier (PLC) applications as it is adapted to...
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7579921 |
On-off keying-7-phase shift keying modulation system and method for fiber communication
A modulation system includes a modulator configured to employ a modulation mechanism on data. The mechanism includes a signal constellation configured to map sub-carriers which include a signal to...
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7570713 |
System and method for anticipatory receiver switching based on signal quality estimation
A system and method of switching from a first receiver receiving a constant bit rate signal to a second receiver receiving the constant bit rate signal, where the constant bit rate signal received...
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7567633 |
Reception device with data recovery mechanism, adapted to transmission system using a direct spread spectrum sequence
A BPSK type reception device that includes a decoder for decoding a digital input signal, first and second comparators for delivering a decoded data signal and a data capture clock signal also...
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7564929 |
System for coherent demodulation of binary phase shift keying signals (BPSK)
A system for the coherent demodulation of Binary Phase Shift keying (BPSK) signal at a frequency f, includes recovering a carrier signal (C) at a frequency 2f from the BPSK signal; injecting the...
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7545306 |
Directly sampling radio frequency signals
The present disclosure is directed to a system and method for directly sampling RF signals. In some implementations, an RF reader includes a clock generator and an Analog-to-Digital Converter...
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7529314 |
Carrier phase detector
Carrier phase detector for calculation of a feedback signal (D) for a carrier phase loop in a receiver,
which loop detects a phase error (Δφ) between a phase (φ in ) of a received signal (E in...
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7528758 |
Flash-type analog to digital conversion circuit for comparing an analog input voltage with a plurality of reference voltages
A plurality of reference voltages are generated by a reference voltage generation circuit. A plurality of comparators is supplied respectively with an analog input voltage and any two reference...
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7519134 |
Method and apparatus to determine phase difference between a received analog signal and a reference signal based upon a local oscillator
An apparatus and method for use by a receiver in decoding information sent by phase-shift keying over a carrier frequency is disclosed. The method is well suited for use with power line carrier...
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7514993 |
IQ demodulator
A method and apparatus for the demodulation, filtering, decimation and optional voltage multiplication of modulated signals to produce in-phase and quadrature outputs using a discrete time...
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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...
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7502424 |
Maximizing data rate by adjusting codes and code rates
The present invention provides for making code rate adjustments and modulation type adjustments in a pseudonoise (PN) encoded CDMA system. Coding rate adjustments may be made by changing the number...
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7492836 |
Wireless data communication demodulation device and demodulation method
When a first half of a transmission packet is sent by an FSK modulating signal, and a latter half thereof is sent by a PSK modulating signal, a received signal is converted into an intermediate...
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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...
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7486131 |
Quadrature demodulator and interrogator
In a receiving section, a first mixer and a second mixer generate an I signal and a Q signal from a modulated reception signal, a local signal, and a local signal obtained by shifting a phase by 90...
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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...
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7463692 |
Device and method for symbol clock recovery in digital television
A device and method for a symbol recovery in a digital television are disclosed. The device includes a symbol clock recovery device includes a remained phase error remover operating a digital...
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7457375 |
Timing extractor, timing extraction method, and demodulator having the timing extractor
In a timing component extractor for a digital modulated signal, a frequency converting section 30 receives a complex baseband signal having a symbol rate fs and formed from an I signal and a Q...
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7456682 |
Demodulator and phase compensation method thereof
The exemplary demodulator of the present invention can eliminate effectively a phase fluctuation which cannot be fully eliminated by a carrier recovery loop (feedback loop), with subsequent...
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7426246 |
Dual layer signal processing in a layered modulation digital signal system
Systems and methods for receiving layered modulation for digital signals are presented. An exemplary apparatus comprises a tuner for receiving a layered signal and producing a layered in-phase...
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7423987 |
Feeder link configurations to support layered modulation for digital signals
Systems and methods are disclosed for feeder link configurations to layered modulation. One feeder link system employs feeder link spot beam to antennas in distinct coverage areas to enable...
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7415078 |
Demodulation for phase modulation
A method and pre-processor for processing a MCPM signal including a phase multiplier for multiplying a MCPM signal by a scaling factor. The pre-processor also includes a frequency shifter for...
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7409015 |
Adaptive modulation scheme based on cutoff rate with imperfect channel state information
A cutoff rate may be used to determine an optimal binary input distribution for a communications system which operates with imperfect receiver channel state information (CSI) at the receiver....
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RE40376 |
Radio apparatus carrying out automatic gain control and gain control method
A fading rate of a mobile terminal unit is estimated by a fading rate estimation unit and an optimum step constant is decided by a step constant determiner depending on the estimated fading rate....
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7362814 |
Memoryless spectrum correction algorithm for non-ideal I/Q demodulators
An algorithm for correcting the output of an analog I/Q demodulator without the need for calibration or storing state information. The output of the analog I/Q demodulator is digitized, and the...
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7336732 |
Carrier frequency detection for signal acquisition
A carrier frequency in a filtered received M-ary phase-shift keyed (MPSK) modulated signal having in-phase and quadrature components is detected by processing the filtered received signal to remove...
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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...
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7336717 |
Receiver circuit, in particular for a mobile radio
A radio receiver with a low intermediate frequency has a first mixer stage that can be fed with a modulated input signal and at whose output a complex intermediate frequency signal can be derived....
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7315587 |
Demodulation method and apparatus based on differential detection system for π/4 shifted QPSK modulated wave
A demodulator of a differential detection system for a π/4 shifted QPSK or DQPSK modulation wave in digital communication. The demodulator includes a differential detector connected to receive...
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7315578 |
Fast soft value computation methods for gray-mapped QAM
A method and apparatus use unified equations to provide computationally efficient but exact solutions to bit soft value computations for Gray-coded QAM symbols in a received communication symbol as...
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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...
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7308049 |
Method and apparatus for noncoherent signal processing in pilotless wireless systems
Methods, apparatus and systems for implementing an algorithm for N-symbol noncoherent processing of M-ary DPSK signals in a pilotless, wireless system is provided. The algorithm is carried out with...
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7295638 |
Communication device
A direct sequence spread spectrum (DSSS) receiver ( 100 ) consistent with certain embodiments has a frequency generator ( 112 ) that generates a local oscillator signal without use of a...
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7260158 |
Digital broadcast receiver and digital broadcast receiving method
A digital broadcast receiver capable of adequately receiving a higher-level layer service along with a lower-level layer service even if the reception CNR degrades. A demodulation decoding section...
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7251573 |
Phase detector
The present invention concerns a phase Detector for detecting a phase difference between a data clock DATA-CLK and a reference clock REF-CLK using a data signal DATA. A trasnsition of the data...
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7245672 |
Method and apparatus for phase-domain semi-coherent demodulation
A method and apparatus for phase-domain semi-coherent demodulator including a receiver for receiving at least a phase component of an input signal. The phase domain semi-coherent demodulator may...
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7242729 |
Signal decoding method and apparatus
An apparatus and method for use by a receiver in decoding information sent by phase-shift keying over a carrier frequency is disclosed. The method is well suited for use with power line carrier...
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7230999 |
Method for extended coherent data demodulation for GPS receivers
A method of performing data detection for a global positioning system (GPS) receiver is disclosed. The method includes receiving a first in-phase (I) reference signal during a first time interval...
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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...
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7200189 |
Method and system for providing adaptive timing recovery for low power application
A system for providing adaptive timing recovery is provided. In an exemplary embodiment, the system includes a fractional resampler, an error function module and a loop filter, arranged...
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7197136 |
Digital portable telephone set
Phase data 129 of received signal is fed through a one symbol delaying unit 141 and a second substracter 1 to a second decoder 2 for decoding to generate quality data 133 c . The quality...
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7190216 |
Demodulation circuit and receiving set
In a sampling block 40 a - 1 , an intermediate frequency signal RIFs is sampled at a frequency of the intermediate frequency signal RIFs multiplied by “1/(m+0.25)” or “1/(m+0.75)” (m: 0 or...
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7187728 |
Coding method and use of a receiver with a convolutional decoder
A coding method for modulating carrier signals with 16 different digital states (4 bit signals) possesses a high synchronicity robustness and an at least partially improved coding gain. The coding...
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7170930 |
Receiver
A method of equalizer adaptation involves comparing equalizer output values with a center threshold, and with at least one of a pair of outer thresholds, and adapting the equalizer in order to...
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7109787 |
High-efficiency circuit for demodulating carriers in quadrature
A demodulation circuit for demodulating a received signal including carriers in quadrature modulated by digital signals and/or in which the processing is performed on two carriers in quadrature....
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7095810 |
Practical M-ary demodulator and method of operation for use in a CDMA wireless network base station
A demodulator for demodulating S orthogonal modulation codes, each code comprising M binary bits representing an N-bit data symbol, where M=2 N . The demodulator comprises a Logic 00 detector for...
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7095809 |
Practical M-ary demodulator using hard decision circuit and method of operation for use in a CDMA wireless network base station
A demodulator for demodulating S possible orthogonal modulation codes received serially as binary data, wherein each of the S possible orthogonal modulation codes comprises M binary bits...
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7095274 |
System for demodulation of phase shift keying signals
The invention particularly relates to a system for demodulation of PSK signals which takes advantage from the effects that the locking of resonant circuits by superharmonic injection produce,...
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7092469 |
Synchronization signal detector and method of detection of synchronization signal
The invention is a method and demodulator which detects periodic synchronization signals. The method of the invention includes multiplexing orthogonal signals in a wireless transmission into a...
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