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7623600 |
High speed receive equalizer architecture
Equalization is provided in a high speed communication receiver that includes in various aspects an automatic gain control input stage, a decision feedback equalizer, a clock and data recovery...
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7620125 |
Frequency estimation apparatus and related method
A method of frequency estimation includes (a) receiving frequency correction channel (FCCH) data samples; (b) calculating an estimated frequency offset based on the received data samples; (c)...
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7616935 |
Method and apparatus for matching receiver carrier frequency
A carrier recovery method and apparatus using multiple stages of carrier frequency recovery are disclosed. A receiver uses multiple frequency generation sources to generate carrier signals used to...
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7600167 |
Flip-flop, shift register, and scan test circuit
A flip-flop has a first latch and a second latch. The first latch has a first feedback circuit and a first selecting circuit which selects one of a first data input signal and an output signal of...
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7599453 |
Doppler spread estimation for OFDM systems
A Doppler spread value of a channel in an Orthogonal Frequency Division Multiplexing (OFDM) system is estimated, wherein the channel comprises a plurality of carrier frequencies. Estimating...
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7596190 |
System, method, and apparatus for correction of code doppler shift
A method of signal reception according to one embodiment of the invention includes compensating for an estimated or measured Doppler shift during integration of a correlated signal. Such a method...
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7593491 |
Quadrature single-mixer multi-mode radio frequency receiver
The present invention is a quadrature multi-mode RF receiver that uses a single quadrature mixer for tuning to desired frequency bands. In a direct conversion mode of operation, the RF receiver...
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7593358 |
Transmission device for remote control systems
Transmitter device including a modulator apparatus for the generation of a modulated digital signal in a remote control system. The modulated signal is defined by at least one characteristic...
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7587003 |
Method and device for carrier-frequency synchronization of a vestigial-sideband-modulated signal
A method and a device for carrier-frequency synchronization of a vestigial-sideband-modulated received signal (r VSB (t)) with a carrier signal (e j(2π(f T +Δf)t+Δφ) ), which is affected by a...
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7583773 |
Frequency synthesizing device with automatic calibration
A frequency synthesizer with automatic calibration includes a voltage-controlled oscillator, which has several working bands for receiving a coarse-tuned signal and a fine-tuned signal and...
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7583770 |
Multiplex signal error correction method and device
A method of reducing a phase error caused by a plurality of error sources in a signal in the form of a sequence of a plurality of digital partial signals associated with a number of subcarriers (k)...
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7580684 |
Programmable radio transceiver
A fully integrated, programmable mixed-signal radio transceiver comprising a radio frequency integrated circuit (RFIC) which is frequency and protocol agnostic with digital inputs and outputs, the...
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7580486 |
Multi-input multi-frequency synthesizing apparatus and method for multi-band RF receiver
A multi-input multi-frequency synthesizing apparatus and method for a multi-band radio frequency (RF) receiver. The frequency synthesizing apparatus may generate an output from a greater number of...
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7580483 |
Trimming of local oscillation in an integrated circuit radio
A method and apparatus for trimming of a local oscillation within a radio frequency integrated circuit (RFIC) includes processing that begins when an RFIC receives a radio frequency (RF) signal...
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7580468 |
Synchronization circuits, orthogonal frequency division multiplexing (OFDM) receivers, and related methods and computer program products
Synchronization circuits are provided for orthogonal frequency division multiplexing (OFDM) receivers. The synchronization circuits include a fast Fourier transform (FFT) processor and a...
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7580390 |
Reducing handover frequency error
Frequency estimation information obtained when a wireless communication device (WCD) is in one wireless communication system, such as frequency error or offset information, may be translated to a...
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7577219 |
Apparatus for communications
An apparatus for communications includes, a front processor for outputting a digital formatted base band signal with quadrature demodulating a modulated signal; an interpolation processor for...
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7577216 |
Guard interval and FFT mode detector in DVB-T receiver
For determining FFT and GI (guard interval) modes within a receiver, a correlation signal is generated from an in-phase and quadrature (I/Q) stream. An plurality of GI mode division signals are...
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7577214 |
OFDM signal receiver and receiving method
A receiver having a frequency-deviation detector which includes: a storage for locating and storing the frequency-domain symbol-signal in a two-dimensional data area on a two-dimensional space...
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7570722 |
Carrier frequency offset estimation for OFDM systems
A system comprises a receiver module that receives a signal that is modulated using coherent orthogonal frequency division multiplexing (OFDM) modulation. A signal to noise ratio (SNR) module...
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7567640 |
Phase offset tracking method for tracking a phase offset and device thereof
The invention relates to a phase offset tracking module and method for tracking a phase offset, and in particular, to a phase offset tracking module and method for tracking a phase offset in a...
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7567131 |
Device for ultra wide band frequency generating
Devices ( 1 ) for exchanging ultra wide band signals comprise frequency translating stages ( 20,30 ) for frequency translating signals and oscillating stages ( 40 ) for supplying main...
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7558346 |
Symbol detector based on frequency offset compensation in ZigBee system and symbol detecting method thereof
The invention relates to a symbol detector for detecting symbols received in a receive modem of short-range wireless personal area network of a ZigBee system (IEEE 802.15.4). An OQPSK short-range...
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7558340 |
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...
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7555073 |
Automatic frequency control loop circuit
Provided is a frequency control loop circuit changing division ratios of a frequency synthesizer to oscillate frequencies in a broadband with high precision. The circuit comprises a clock...
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7551696 |
Method and apparatus of detecting ISI/ICSI in an OFDM system
A method for detecting inter-symbol interference (ISI) in an OFDM system includes the steps of computing a first correlation value representing the correlation between a plurality of first signals...
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7545891 |
Carrier recovery architectures for multi input multi output orthogonal frequency division multiplexing receivers
A modem system for transmitting and receiving signals having a frequency domain equalizer (FEQ) being responsive to a plurality of received data symbols for processing the same to generate one or...
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7545870 |
Reception device
A reception device according to the present invention receives a transmission frame including a synchronization symbol string, having a synchronization symbol repeated multiple times, inserted...
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7541966 |
Apparatus and method for demodulating a modulated signal
An apparatus for demodulating a modulated signal comprises an analog to digital converter ( 2, 12 ) for converting an analog modulated input signal to a digital signal. The analog to digital...
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7541884 |
Methods and apparatus for crystal oscillator drift estimation and compensation
In at least some disclosed embodiments, a method includes receiving a burst of data out of multiple bursts of data subject to long-term frequency drift and short-term frequency drift, determining...
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7535982 |
Method and apparatus for adjusting phase of sampling frequency of ADC
A method for adjusting a phase of a sampling frequency of ADC is disclosed. The method includes converting an analog signal into a first digital signal according to a first phase of the sampling...
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7535976 |
Apparatus and method for integration of tuner functions in a digital receiver
A receiver to process a RF input signal having a plurality of channels includes a direct down conversion circuit, a demodulation circuit, and a local oscillator circuit. The direct down conversion...
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7532693 |
Method and apparatus for acquistion and tracking of orthogonal frequency division multiplexing symbol timing, carrier frequency offset and phase noise
A method for estimating symbol timing of a guard interval in an orthogonal frequency division multiplexing receiver of a wireless local area network comprises receiving a preamble including a...
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7532667 |
Pilot-directed and pilot/data-directed equalizers
A normalized least means square (NLMS) equalizer including two equalizer filters is disclosed. In one embodiment, a single correction term generator is used to generate correction terms for tap...
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7529326 |
Precise frequency estimation of short data bursts
The invention performs frequency estimation over both the burst preamble, during which known symbols are transmitted, and also during the burst's data packet, which is subsequent to the preamble...
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7526013 |
Tag communications with access point
A method of establishing communication at a tag includes calculating a metric for each of a plurality of automatic frequency control (AFC) hypotheses where the plurality of AFC hypotheses...
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7522691 |
Phase-locked circuit
A phase-locked circuit comprises a complex signal processor and a feedback portion wherein the complex signal processor: receives as an input a first complex signal composed of a real part...
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7519140 |
Automatic frequency correction PLL circuit
An automatic frequency correction phase-locked loop (PLL) circuit includes an analog control circuit and a digital control circuit. The digital control circuit includes a High-side comparator and a...
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7515657 |
Frequency tracking for OFDM transmission over frequency selective channels
A system comprises a receiver module that generates a receiver carrier frequency and that demodulates an orthogonal frequency division multiplexing (OFDM) signal using the receiver carrier...
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7515653 |
Digital broadcasting receiver, driving method thereof, and self-diagnosis method thereof
A digital broadcasting receiver, a driving method, and a self-diagnosis method thereof, are provided. The digital broadcasting receiver includes: a digital demodulator for demodulating a digital...
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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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7512195 |
Frequency control apparatus, wireless communication apparatus and frequency control method
A wireless communication apparatus performs fast control even on a large phase rotation of a received signal to synchronize the frequency of a received signal with a specified frequency. A...
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7509108 |
Method and apparatus for automatic frequency correction with a frequency error signal generated by block correlation of baseband samples with a known code sequence
The present invention is related to a method and apparatus for automatic frequency correction of a local oscillator. The apparatus receives a carrier signal. The carrier signal includes a code...
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7509104 |
Method and apparatus for tuning radio frequency
A double conversion RF tuner includes an up-conversion unit and a down-conversion unit. The up-conversion unit up converts a received radio frequency (RF) signal corresponding to a first frequency...
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7508888 |
Method and apparatus for precise open loop tuning of reference frequency within a wireless device
A communications subsystem for a wireless device for correcting errors in a reference frequency signal. The communications subsystem comprises a frequency generator for generating the reference...
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7502602 |
Method and apparatus to compensate loop error of phase locked loop
Briefly, according to embodiments of the invention, there is provided a method and an apparatus to compensate for a closed loop response error of a transfer function of a phase locked loop unit.
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7499507 |
Synchronization module using a Viterbi slicer for a turbo decoder
A method for synchronizing receivers that receive turbo encoded signals to a received signal. Turbo encoding may enable signals to be decoded at a much lower signal to noise ratio than previously...
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7496161 |
Adaptive equalization system for a signal receiver
In one embodiment, a communication receiver includes an adaptive filter, a clock and data recovery (CDR) unit, and an adaptation control unit. The adaptive filter equalizes an input signal received...
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7496160 |
Frequency offset detection processing system and frequency offset detection processing method using the same
A frequency offset detection processing system includes a TCXO, demodulation unit, frequency offset detection unit, and AFC control unit. In the AFC control unit, a majority determination unit...
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7489660 |
Circuit for preventing signal quality degradation in CDMA system and method thereof
A system for preventing signal quality degradation in a CDMA system includes a phase locking unit for controlling a phase of an oscillating frequency signal by controlling a voltage control...
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