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6757345 |
Reception method and receiver
The invention relates to a reception method and a receiver to receive signals supplied from a radio path, and the signals include information and each signal which arrives at the receiver is...
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6757324 |
Method and apparatus for detecting jamming signal
In a wireless communication device ( 106 ) a method of detecting a narrowband jamming signal ( 404 ) includes receiving a wireless communication signal ( 104 ) and downconverting the wireless...
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6757323 |
Rapid signal acquisition by spread spectrum transceivers
Spread spectrum transceivers communicate using code sequences having low cross-correlations and well-peaked autocorrelations. The initial communications involve broadcasting a beacon signal...
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6754257 |
Frame timing synchronization method
A frame timing synchronization method of establishing frame synchronization includes the steps of obtaining an integration result, a plurality of number of times, by integrating the square of a...
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6754256 |
Searcher for CDMA receiver apparatus
A searcher for a CDMA receiver apparatus includes a correlator obtaining a correlation value between a spreading code sequence and a spreading code sequence within a received signal, and a...
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6751247 |
Method of reducing interference, and radio system
The invention relates to a method of reducing interference in a radio system comprising at least one base station and a subscriber terminal. The data to be transmitted is converted into symbols in...
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6748013 |
Receiver for wireless telecommunication stations and method
The present invention is directed to an improved telecommunication receiver for receiving wireless multi-path communication signals. A novel RAKE receiver and a time diverse integration system for...
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6748015 |
Spread spectrum receiver with multi-bit correlator
A terrestrial C/A code GPS receiver system digitally samples, filters and stores a segment of 11 half chips of the received composite as a binary number and multiplexes this number for parallel...
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6748014 |
Correlator/FIR filter unit for dual-mode transceiver
A Time Division Multiple Access (TDMA) and Code Division Multiple Access (CDMA) transceiver in which correlator banks consisting of an array of dual-code correlators (two tri-code correlators) are...
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6748007 |
Method of processing a pulse response with an adaptive threshold and corresponding receiver
A method of processing a pulse response with an adaptive threshold and corresponding receiver. According to the method, an adaptive threshold is calculated that is a function of a maximum reached...
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RE38523 |
Spreading code sequence acquisition system and method that allows fast acquisition in code division multiple access (CDMA) systems
Methods for generating code sequences that have rapid acquisition properties and apparatus which implement the methods by processing spreading codes on in-phase and quadrature channels. A first...
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6741638 |
Bandpass processing of a spread spectrum signal
A digitally sampled spread spectrum signal is received, despread, and accumulated at a center frequency lower than the sampling rate and higher than zero.
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6738411 |
Simultaneous plural code series generator and CDMA radio receiver using same
An exclusive OR of outputs from a plurality of shift stages of an M-series generator is formed, thereby obtaining an M-series which has a desired delay, which in an example is a three bit delay...
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6736545 |
Wet mateable connector
An underwater connector has a plug unit and a receptacle unit each containing a bladder member having an internal, oil-filled chamber in which a respective contact module is located. Each contact...
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6738438 |
Parameter estimator with dynamically variable search window size and/or placement
A parameter estimator for estimating one or more parameter(s) from a correlation function derived from a signal using a dynamically variable search window is described. The parameter estimator may...
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6735242 |
Time tracking loop for pilot aided direct sequence spread spectrum systems
A novel design of, and method of operation for, a coherent delay lock loop (DLL) for communication systems that employ a pilot channel or pilot symbols is disclosed. Pilot information is used to...
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6735243 |
Method, apparatus and system for fast acquisition of a spread spectrum signal
A system for acquiring a received spread spectrum signal having a code component, the acquiring including matching the phase of a replica of the code component to the phase of the received code...
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6735239 |
Sequence generator
A sequence generator for generating sequences of binary or discrete values may be flexibly adjusted to requirements. Shift register memory locations may be selected as feed-back locations for...
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6731675 |
Receiving device for spread spectrum communication system
A receiving device is provided with a DLL circuit of a reduced scale. An inverse spreading processing to ensure the synchronism with a received signal and a processing to inversely spread original...
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6724810 |
Method and apparatus for de-spreading spread spectrum signals
A correlation circuit arrangement for de-spreading spread spectrum signals. In various embodiments, the correlation circuit arrangement includes an adder-subtractor and a shift register...
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6724838 |
Methods and apparatus to despread dual codes for CDMA systems
A correlator and matched filter for use with coded transmission, such as CDMA, form new codes from the sums and differences of the original codes, where only one of the new codes is non-zero for...
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6724806 |
Variable rate transmission and reception methods, and variable rate transmission and reception devices
A transmission method for implementing variable rate transmission. Part of the baseband processing of a transmitter based on a CDMA transmission scheme is described. A transmitted information...
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6724343 |
Weak signal and anti-jamming Global Positioning System receiver and method using full correlation grid
Disclosed is a system and method for increasing the weak signal recovery capability of a Global Positioning System (GPS) receiver correlating each of the plurality of digital signals by multiplying...
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6724834 |
Threshold detector for detecting synchronization signals at correlator output during packet acquisition
A threshold detector for detecting synchronization signals at correlator output during packet acquisition. An RF receiver converts RF signals into baseband signals. A matched filter correlator...
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6717978 |
Method and apparatus for system time alignment
A method and apparatus for system time alignment is provided. The method and apparatus for a system time alignment provides synchronization between system components even when one or more system...
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6717977 |
Apparatus for acquiring pseudo noise code and direct sequence code division multiple access receiver including the same
An apparatus for acquiring a pseudo noise (PN) code and a direct-sequence code division multiple access (DS-CDMA) receiver are provided. The apparatus for acquiring a pseudo noise (PN) code...
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6717979 |
Method for estimating a direction of arrival
A method for estimating a direction of arrival of a signal transmitted by a signal source and received by an antenna array. The method estimates the covariance matrix of the signals received by the...
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6714512 |
Method and apparatus for a dedicated control channel in an early soft handoff in a code division multiple access communication system
A method and apparatus for high data rate communication in a cellular/PCS communication system is provided. Specifically, the embodiment provides for early assignment of code channel for signaling...
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6714582 |
Code division multiple access communication system and code division multiple access transmitting apparatus
In a CDMA transmitting apparatus, a cross-correlation value between different spreading-code sequences used to spread respective ones of a plurality of transmit signals is calculated, an...
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6711384 |
Apparatus and method for controlling communications based on moving speed
A communication control apparatus installed in a base station or a mobile station in mobile communications system estimates the relative moving speed of an opposing station, and adjusts the values...
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6707844 |
Synchronous circuit and receiver
There is disclosed a synchronous circuit and a receiver in which a long code for use in communication can be determined in a short time, and circuit scale can be reduced. Upon receiving input of a...
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6707847 |
Method and apparatus for detecting a spread code from a perch channel
The method for detecting a spread code from a perch channel of the wide band CDMA (Code Division Multiple Access) by a perch channel detecting circuit, according to the present invention, comprises...
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6707846 |
Correlation energy detector and radio communication apparatus
A correlation energy detector detects a magnitude of a correlation between a first signal series (Ii, Qi) described by I-Q orthogonal components and a predetermined second signal series (H J ). The...
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6707843 |
Strong signal cancellation to enhance processing of weak spread spectrum signal
A CDMA coded, spread spectrum radio signal containing a strong signal and a weak signal is received, and the interference of the strong signal with the weak signal is computed to enhance the...
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6707842 |
Accelerated base station searching by buffering samples
A method and apparatus for searching for neighboring base stations by waking from a power-saving sleep mode to receive an incoming signal. The incoming signal is received and at least a portion of...
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6704347 |
CDMA receiver operable in a time division fashion and method for controlling the same
In a CDMA receiver used in a CDMA cellular mobile telephone system, a searcher which is used to determine reception timing of a plurality of finger processing portions is operated in a time...
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6704348 |
Method and apparatus for computing signal correlation at multiple resolutions
A method and apparatus for computing a convolution between an input GPS signal and a C/A code reference by generating the convolution result in real time without storing unprocessed signal samples....
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6700924 |
Spread-spectrum data transmission apparatus comprising a data receiver
A spread spectrum data transmission apparatus, suitable for use in radiotelephony utilizing Code Division Multiple Access (CDMA), includes a receiver for receiving data organized in symbols having...
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6697350 |
Adaptive vector correlator for spread-spectrum communications
A multiple access, spread-spectrum communication system processes a plurality of information signals received by a radio carrier station over telecommunication lines for simultaneous transmission...
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6697417 |
System and method of estimating earliest arrival of CDMA forward and reverse link signals
A method for estimating the earliest signal arrival in a wireless communication system is presented. The system includes a base station that transmits a plurality of pilot signals and a mobile...
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6697444 |
Recycling integrator correlator
An analog input signal that is sampled at a predetermined rate is multiplied by a corresponding binary code sequence, i.e. “+1” or “−1” by the multiplier. The output of this multiplier is...
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6693955 |
Portable terminal
A portable terminal has a level detect or which compares profile data generated by a profile generator with a threshold value, and determines a sampling rate for a correlating process performed by...
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6690716 |
Correlator for realizing low current consumption
A correlator can stop correlation computation on the basis of the value of a despreading code, and decreases the operation ratio of a section operated in accordance with a despreading code pattern...
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6690714 |
Method and apparatus for achieving demodulation in radio communications system using M-sequence orthogonal modulation
A reception apparatus for achieving demodulation in a radio communications system using M-sequence orthogonal modulation capable of achieving a good characteristic near the error rate...
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6690715 |
Rake receiver with embedded decision feedback equalizer
The performance of a RAKE receiver for indoor multipath WLAN applications on direct sequence spread spectrum signals having relatively short codeword lengths is enhanced by embedding a decision...
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6687507 |
Time of arrival estimation for edge/GSM
In systems which transmit both GSM modulated and EDGE modulated signals, time of arrival estimations can be improved without requiring the detection of the type of modulation used on the received...
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6683906 |
Radio communication apparatus
A radio communication apparatus subjects each signal which is received via a multi-path and demodulated, to a Hadamard transform at each of fingers, by use of an M-ary quadrature coding scheme,...
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6683923 |
Method and apparatus for detecting and tracking coded signals in a noisy background environment
A method and apparatus for detecting and tracking a coded signal within a noisy background environment, wherein the signal is correlated over subintervals of time both in-phase and in quadrature,...
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6683907 |
Amplitude and phase estimation method in a wireless communication system
Apparatus for a transmitter and a receiver which enhance the performance of a system coherent demodulation by utilizing non-pilot sub-channels to enhance the accuracy of estimates of amplitude and...
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6683929 |
Mobile communication device having a good tracking precision and a wide following range of synchronization
A mobile communication device has a delay locked loop circuit for carrying out a tracking synchronization of a reception signal. The reception signal may be a spread spectrum signal. The delay...
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