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7020183 |
Code division multiple access signal receiving apparatus
In a code division multiple access signal receiving apparatus for demodulating transmit data by subjecting a receive signal to despread processing using a code sequence identical with a...
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7010020 |
Code tracking loop with automatic power normalization
The present invention is for a receiver incorporated into User Equipment (UE) or base stations of a code division multiple access (CDMA) communication system. The UE and base station are in...
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7010071 |
Method of generating and/or detecting synchronization sequences, synchronization method, transmitter unit and receiver unit
Method for forming and/or determining a synchronization sequence, a synchronization method, a transmitting unit and a receiving unit, the formation of synchronization sequences, which are based on...
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7010023 |
Path search circuit for simultaneously performing antenna directivity control and path search
A path search circuit simultaneously performs antenna directivity control and a path search. A weighting controller controls weighting coefficients to establish an antenna directivity in a...
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7010067 |
Methods and apparatus for feature recognition time shift correlation
Methods and apparatus for feature recognition time shift correlation are presented. An exemplary method includes the step of identifying a feature in an input data stream. A starting time...
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7006800 |
Signal-to-noise ratio (SNR) estimator in wireless fading channels
A signal-to-noise estimator is provided for estimating the signal-to-noise ratio in wireless fading channels. The estimator can be applied to likelihood ratio estimation of turbo decoders in third...
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7003022 |
Matched filter and receiver for mobile radio communication system
A matched filter requiring no high-speed processor and which consumes less power is disclosed. Partial filters 301–30 N obtained by dividing number of matched filter taps by N are provided with...
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7003060 |
High precision data and clock output circuit
An output circuit of the present invention includes a data output circuit and a clock output circuit. The output circuit includes a first D-type flip-flop and a selector for selectively outputting...
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7003271 |
Direct conversion receiver having a gain-setting dependent filter parameter
In a direct conversion radio frequency receiver, an automatic gain control is implemented that allows changing the operation mode of a filter unit in the baseband section of the receiver such that...
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7003056 |
Symbol timing tracking and method therefor
A system and method in a communication device ( 10 ) uses timing tracking to correct timing drifting due to the difference in frequency of a transmitter clock and a receiver clock. With the timing...
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7003415 |
Delay profile estimation apparatus and a correlating unit
A delay profile estimation apparatus and a correlating unit to obtain delay profile with suppressed noise are disclosed. The delay profile estimation apparatus includes a receiving unit to receive...
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7002946 |
Frequency discriminator
A cross product is determined for a received signal. A dot product is also determined for the received signal. If the cross product is greater than a predetermined threshold, the cross product is...
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7002940 |
Multiple-stage filtering device and method
A filter is provided that is formed of multiple filter stages arranged in series. Each of these filter stages has an input tap at its input that can be selectively connected to a filter input...
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6999534 |
Method for mitigating DC offset in a sign bit correlator
A method 10 is provided to mitigate DC offset in a sign bit correlator associated with a packet detection circuit. The input sign pattern is monitored; and if a long run of the same sign is seen,...
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6999533 |
Demodulating encoded data
The invention provides the ability to exploit redundancy characteristics of an equation set used to generate waveforms for wireless communication. In doing so, the invention can reduce the number...
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6993344 |
CDMA wireless base station
Disclosed is a W-CDMA wireless base station adapted to meet various specifications over a wide range to dynamically change the allocated numbers of RACH's and DPCH's depending on a cell radius and...
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6993101 |
Method of determining a start of a transmitted frame in a frame-based communications network
A method of determining a start of a transmitted frame at a receiver on a frame-based communications network. A received transmitted frame is filtered using filter coefficients matched to a...
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6990141 |
Correlator
A correlator which detects correlation for data having a certain length includes a plurality of sub-correlators, each of the sub-correlators having a length equal to a divisor of the certain length...
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6987820 |
Apparatus for navigation satellite signal quality monitoring
An apparatus for the detection of positioning system satellite signal distortions includes a correlator that determines a plurality of correlation measurements at points along a correlation curve....
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6985521 |
Method and apparatus for channel estimation for X-DSL communications
An apparatus and method is disclosed for channel estimation in an X-DSL communication device. The communication device may include physical or logical modems. The modems may implement one or more...
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6985542 |
Coherent processing of satellite signals to locate a mobile unit
A method and system for finding the position of a mobile unit with respect to the satellites of a satellite network such as the Global Positioning System and with respect to the base stations of a...
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6983011 |
Filter circuit
In a filter circuit of the present invention, a partial quantization value is computed by a quantization circuit according to a spread code and others in a unit at an arbitrary stage, where an...
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6980609 |
Matched filter, filtering method and digital broadcast receiver using the same
A digital passband matched filter is automatically adapted to a carrier wave ω in accordance with a frequency offset of the carrier wave, to obtain a passband digital signal having no frequency...
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6973120 |
Receiver for CDMA system
A receiver configured to receive signals corresponding to spread spectrum information symbol streams by pseudorandom binary sequences includes at least one channel (V 1 ) with an adapted filter (...
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6968021 |
Synchronization method and apparatus for modems based on jointly iterative turbo demodulation and decoding
A bandwidth efficient advanced modulation waveform modem using concatenated iterative turbo coding and continuous phase modulation is disclosed. A demodulator in the modem has a turbo decoder and a...
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6965631 |
Low power passive correlators for multichannel global positioning system signal receiver
One embodiment of the present invention includes a circular shift register, K storage elements, and a code register. The circular shift register having N data samples circularly shifts a first data...
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6965632 |
Method and apparatus for using adaptive threshold with initial acquisition
A method and apparatus for initial acquisition using an adaptive threshold includes performing a sort operation of a plurality of full-length correlator outputs and updating the adaptive threshold....
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6963546 |
Multi-user detection using an adaptive combination of joint detection and successive interface cancellation
A time division duplex communication system using code division multiple access transmits a plurality of data signals over a shared spectrum in a time slot. A combined signal is received over the...
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6961371 |
Cellular communications system receivers
An impulse response matrix of a received signal in a TDMA communications system is approximated using a plurality of indirect variables of a linear complex vector. The indirect variables are used...
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6961393 |
In-band-on-channel (IBOC) system and methods of operation using orthogonal frequency division multiplexing (OFDM) with timing and frequency offset correction
An OFDM receiver recovers an rf signal as in-phase (I) and quadrature phase (Q) components of a baseband signal sampled in an A/D converter. The I and Q components of a received symbol are...
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6959054 |
Filter bank and receiver for processing continuous phase modulated signals
A filter bank ( 10 ) and receiver including the filter bank ( 10 ) that is designed for processing a baseband signal of a received continuous phase modulated signal S(t) with an integer modulation...
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6959035 |
Post-correlation interpolation for delay locked loops
A Code Division Multiple Access (CDMA) post-correlation processing system ( 12 ) for delay locked loop processing reduces the control data rate into a delay locked loop (DLL) processor and the...
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6959053 |
Method and apparatus for searching for a pre-defined code in a bit stream
A method of searching for a predefined code in a bit stream, the method comprising initiating a first search for correlation of the bit stream with a reference code applied to the bit stream at a...
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6959057 |
Method of enhancing signal tracking in global positioning system receivers
A method of enhancing signal tracking in a global positioning system receiver utilizing a frequency banked filter in providing code and carrier tracking loops includes acquiring a continuous time...
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6956913 |
Non-coherent DP-MOK reception process with combination of multiple paths and corresponding receiver
A process for non coherent DP-MOK reception with combination of multiple paths and corresponding receiver. The process includes demodulation of orthogonal signals (MOK) which is combined with...
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6954721 |
Signal processing technique
A signal processing technique for generating separated signal components incorporates the steps of correlating basis vectors with input data to produce output vectors, applying a non-linear...
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6954489 |
Determining correlations of received sequences to multiple known sequences in a communications system
A method, system, and apparatus enables interfering signals in a communications system to be efficiently identified using correlation calculations. Once identified, the interfering signals may be...
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6952440 |
Signal detector employing a Doppler phase correction system
A spread spectrum detector employs a Doppler phase correction system that improves correlation of pseudo-noise (PN) codes to a received spread spectrum signal by combining phase shifts, in the time...
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6947504 |
Frequency synchronizer
A frequency synchronizer system is based on the maximum likelihood criterion from estimation theory and that can achieve both frequency acquisition and frequency tracking without requiring...
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6947489 |
Combined preamble detection and information transmission method for burst-type digital communication systems
Burst transmissions in a burst-type communication system include a preamble synchronization sequence which allows detection and synchronization a burst transmission while at the same time providing...
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6947476 |
Method for synchronizing frame by using pilot pattern in compressed mode
Method for synchronizing frames by using pilot patterns in a compressed mode. In a case a W-CDMA mobile communication system is operated in a compressed mode, the present invention permits to...
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6940894 |
Power estimation using weighted sum of pilot and non-pilot symbols
In one embodiment, the invention is directed toward methods for estimating the power of a received signal encoded with both pilot and non-pilot symbols. The method may include separately...
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6940930 |
Automatic burst mode I/Q gain and I/Q phase calibration using packet based-fixed correction coefficients
A method and apparatus for balancing I/Q gain and I/Q phase in a signal receiver. The receiver includes an IQ coefficient calculator and an IQ balancer. The IQ coefficient calculator computes a set...
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6937648 |
Equalizer for communication over noisy channels
An apparatus for and a method of iterative equalization for communication over noisy channels suitable for use with a wide range of different types of communications systems and channels that is...
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6934319 |
Configurable multimode despreader for spread spectrum applications
A configurable multimode despreader for spread spectrum applications is disclosed herein. The despreader includes a plurality of data lines, at least one selective coupler coupled to the plurality...
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6930634 |
Shared memory architecture in GPS signal processing
A shared memory architecture for a GPS receiver, wherein a processing memory is shared among the different processing functions, such as the correlator signal processing, tracking processing, and...
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6928105 |
Vector tree correlator for variable spreading rates
A vector tree correlator correlates over received data spread at differing spreading rates or, over differing lengths of spreading sequence. When the maximum length sequence has a length N that is...
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6925133 |
Apparatus and method for M-ary demodulation in a digital communication system
A demodulator for demodulating a set of S possible orthogonal modulation codes received serially as binary data, wherein each of the orthogonal modulation codes comprises M binary bits representing...
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6922452 |
Method and apparatus for estimating Doppler spread
Doppler spread associated with a Rayleigh or fast fading channel established between a radio base station and a mobile radio station is estimated. In particular, the Doppler spread is estimated...
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6919839 |
Synthetic aperture radar (SAR) compensating for ionospheric distortion based upon measurement of the group delay, and associated methods
A synthetic aperture radar (SAR) compensates for ionospheric distortions based upon measurement of the group delay, particularly when operating in the VHF/UHF band. The SAR is based upon a...
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