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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
6104747 Method for determining optimum number of complex samples for coherent averaging in a communication system Aug. 15, 2000
6094450 Spread spectrum chip shift keying modulation/demodulation system and method Jul. 25, 2000
6094449 Spread spectrum communication synchronization acquisition decoding apparatus Jul. 25, 2000
6091761 Despreading method and arrangement in communication system Jul. 18, 2000
6088382 Cell search circuit for CDMA Jul. 11, 2000
6075807 Windowed digital matched filter circuit for power reduction in battery-powered CDMA radios Jun. 13, 2000
6069912 Diversity receiver and its control method May. 30, 2000
6069915 Randomized code acquisition May. 30, 2000
6067313 Wireless communications system for transmitting and receiving data with increased data rates and robustness May. 23, 2000
6064690 Spread spectrum communication system May. 16, 2000
6064688 CDMA synchronous acquisition circuit May. 16, 2000
6061387 Method and system for turbo-coded satellite digital audio broadcasting May. 9, 2000
6055265 Apparatus for receiving GPS signals by utilizing non-coherent DLL Apr. 25, 2000
6055264 Method and apparatus for fast acquisition and multipath search in a spread spectrum system Apr. 25, 2000
6052408 Cellular communication system with dynamically modified data transmission parameters Apr. 18, 2000
6044104 Cell search method and mobile station apparatus Mar. 28, 2000
6044083 Synchronous code division multiple access communication system Mar. 28, 2000
6041074 Spread spectrum pulse position modulation system Mar. 21, 2000
6002711 Spread spectrum communication system for error compensation of carrier frequency Dec. 14, 1999
6002708 Spread spectrum localizers Dec. 14, 1999
5999561 Direct sequence spread spectrum method, computer-based product, apparatus and system tolerant to frequency reference offset Dec. 7, 1999
5995537 Synchronism acquisition method and apparatus for correlation demodulation Nov. 30, 1999
5995538 Spread spectrum multipath processor system and method Nov. 30, 1999
5963586 Method and apparatus for parallel noncoherent correlation of a spread spectrum signal Oct. 5, 1999
5949813 Method and system for simultaneously broadcasting and receiving digital and analog signals Sep. 7, 1999
5949817 Multi-level correlation system for synchronization detection in high noise and multi-path environments Sep. 7, 1999
5943361 System and method for generating signal waveforms in a CDMA cellular telephone system Aug. 24, 1999
5936950 Data transmission method, reception method, and receiver Aug. 10, 1999
5937001 Range safety communication system and method utilizing pseudorandom noise sequences Aug. 10, 1999
5923701 Spread spectrum pulse position modulation system Jul. 13, 1999
5920287 Radio location system for precisely tracking objects by RF transceiver tags which randomly and repetitively emit wideband identification signals Jul. 6, 1999
5920591 Spreading code generator and CDMA communication system Jul. 6, 1999
5920555 Pilot assisted direct sequence spread spectrum synchronization apparatus Jul. 6, 1999
5862172 Spread spectrum communication system and its transmitter and receiver Jan. 19, 1999
5862186 RF simplex spread spectrum receiver and method Jan. 19, 1999
5859842 Antenna diversity techniques Jan. 12, 1999
5841807 Spread spectrum data communicator Nov. 24, 1998
5835527 Spread spectrum adaptive power control system and method Nov. 10, 1998
5832022 Method and apparatus for controlling the modulation index of continuous phase modulated (CPM) signals Nov. 3, 1998
5812592 Spread spectrum communication apparatus utilizing a phase difference between two signals Sep. 22, 1998
5790537 Interference suppression in DS-CDMA systems Aug. 4, 1998
5790591 Spread spectrum transmitter and communications system using multiple spreading codes Aug. 4, 1998
5774492 Low-complexity direct conversion receiver for delay-and-correlate transmitted reference signaling Jun. 30, 1998
5774493 Sequence constructions for delay-and-correlate transmitted reference signaling Jun. 30, 1998
5754584 Non-coherent spread-spectrum continuous-phase modulation communication system May. 19, 1998
5692007 Method and apparatus for differential phase encoding and decoding in spread-spectrum communication systems with continuous-phase modulation Nov. 25, 1997
5687190 Non-coherent direct sequence spread spectrum receiver for detecting bit/symbol chip sequences using threshold comparisons of chip sequence correlations Nov. 11, 1997
5668829 Spread spectrum communication apparatus Sep. 16, 1997
5663981 Radio communication apparatus Sep. 2, 1997
5659573 Method and apparatus for coherent reception in a spread-spectrum receiver Aug. 19, 1997

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