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Class Information
Number: 375/142
Name: Pulse or digital communications > Spread spectrum > Direct sequence > End-to-end transmission system > Having correlation-type receiver
Description: Subject matter in which transmitted signals are recovered using a structure or method that compares a transmitted spreading code sequence with a local spreading code sequence, generally by multiplicative means.










Patents under this class:
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Patent Number Title Of Patent Date Issued
6535546 Method and apparatus for determining characteristics of components of a communication channel under load Mar. 18, 2003
6532251 Data message bit synchronization and local time correction methods and architectures Mar. 11, 2003
6526091 Communication methods and apparatus based on orthogonal hadamard-based sequences having selected correlation properties Feb. 25, 2003
6526039 Method and system for facilitating timing of base stations in an asynchronous CDMA mobile communications system Feb. 25, 2003
6522682 Triple multiplexing spread spectrum receiver Feb. 18, 2003
6519237 Apparatus and method for parallel searching and correlating for CDMA system Feb. 11, 2003
6516020 Correlator and despreading code switching method Feb. 4, 2003
6512786 Matched-filter obtained side information for relative-signal-level data detection from a spread-spectrum signal Jan. 28, 2003
6507602 Smoothing receiver channel estimates using spectral estimation Jan. 14, 2003
6504883 Synchronous detector Jan. 7, 2003
6493404 Recycling integrator correlator Dec. 10, 2002
6487236 Method and apparatus for achieving demodulation in radio communications system using M-sequence orthogonal modulation Nov. 26, 2002
6487252 Wireless communication system and method for synchronization Nov. 26, 2002
6473451 Signal to interference power ratio measuring apparatus and signal to interference power ratio measuring method as well as transmission power controlling method under CDMA communication system Oct. 29, 2002
6473452 Method and apparatus for digital correlation Oct. 29, 2002
6473450 Adaptive reference pattern for spread spectrum detection Oct. 29, 2002
6466958 Parallel frequency searching in an acquisition correlator Oct. 15, 2002
6463046 Method and apparatus for controlling a searcher in a CDMA communication system Oct. 8, 2002
6459721 Spread spectrum receiving apparatus Oct. 1, 2002
6459883 Generic finger architecture for spread spectrum applications Oct. 1, 2002
6456612 Device and method for generating short PN code in a mobile communication system Sep. 24, 2002
6456647 Two step signal recovery scheme for a receiver Sep. 24, 2002
6456644 Bandpass correlation of a spread spectrum signal Sep. 24, 2002
6456646 Methods and systems for detecting codewords with intersymbol interference and imperfect timing Sep. 24, 2002
6452961 Massively paralleled sequential test algorithm Sep. 17, 2002
6449266 Data transmission method, transmitter, and receiver Sep. 10, 2002
6445728 Method of establishing search window size for a mobile station in a cellular system Sep. 3, 2002
6438118 Code-multiplexing communication apparatus Aug. 20, 2002
6434185 Correlation system for use in wireless direct sequence spread spectrum systems Aug. 13, 2002
6430212 Spread-spectrum GMSK/M-ary radio Aug. 6, 2002
6421371 Modulation sequence synchronization methods and apparatus employing partial sequence correlation Jul. 16, 2002
6414984 Method for controlling a receiver, and a receiver Jul. 2, 2002
6414985 Method for determining reference phase in radio communication system which uses orthogonal M-ary modulation, and coherent detection method using the same Jul. 2, 2002
6414986 Method and system for radio communication Jul. 2, 2002
6408018 Complex matched filter with reduced power consumption Jun. 18, 2002
6400753 Pseudo-noise correlator for a GPS spread spectrum receiver Jun. 4, 2002
6396866 Symmetric chirp communications acquisition method and apparatus May. 28, 2002
6396870 Matched filter simultaneously operating for two different type codes May. 28, 2002
6393046 Spread spectrum receiver with multi-bit correlator May. 21, 2002
6393049 Two-stage synchronization of spread-spectrum signals May. 21, 2002
6377585 Precision reference generation system and method Apr. 23, 2002
6377613 Communication apparatus for code division multiple accessing mobile communications system Apr. 23, 2002
6377611 Apparatus and method for a DSSS/CDMA receiver Apr. 23, 2002
6377618 Auto-correlation system and method for rate detection of a data communication channel Apr. 23, 2002
6377615 Apparatus and methods for receiving information using variable length accumulation searchers Apr. 23, 2002
6366605 Spread-spectrum data detection using matched-filter obtained side information Apr. 2, 2002
6366603 Spread spectrum communication system Apr. 2, 2002
6363106 Method and apparatus for despreading OQPSK spread signals Mar. 26, 2002
6359925 Relative-signal-level data detection from a spread-spectrum signal using matched-filter obtained side information Mar. 19, 2002
6349109 Direct sequence spread spectrum differential receiver with mixed interference signal formation means Feb. 19, 2002

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