Pulse or digital communications – Repeaters – Testing
Patent
1990-08-27
1992-03-24
Gregory, Bernarr E.
Pulse or digital communications
Repeaters
Testing
380 34, 370 18, H04L 2730
Patent
active
050994930
ABSTRACT:
Disclosed is a multiple-signal receiver system for direct sequence, code division multiple access (CDMA), spread spectrum (SS) signals. The receiver is structured to overcome inter-signal interference during signal acquisition and data reception even when the ratio of received signal powers exceeds the bandwidth spreading ratio of the signals. The receiver contains one processing channel for each signal in which correlation with the spread spectrum code of its particular signal is used to selectively isolate that signal so that its waveform parameters can be estimated, its data demodulated, and its waveform reconstructed. Each reconstructed CDMA waveform is individually adjusted in amplitude and phase to cancel its particular CDMA signal from the composite input of multiple CDMA signals. This receiver structure allows cancellation at the input of each receiver signal processing channel of all CDMA signals except the particular desired signal for that channel.
REFERENCES:
patent: 4885757 (1989-12-01), Provence
"The Theory of Spread Spectrum Communications--A Tutorial", IEEE Transactions on Communications, vol. COM-30, No. 5, May 1982, pp. 855-884, Pickholtz et al.
"Adaptive Cancellation of Mutual Interference in Spread Spectrum Multiple Access", IEEE International Conference on Communications, Jun. 8-12, 1980, pp. 44.4-44.4.5 in, vol. 3 of ICC Conference Record, Thomas K. Kashihara.
"Multistage Detection in Asynchronous Code Division Multiple Access Communication", IEEE Transactions on Communications, vol. COM-38, No. 4, Apr. 1990, pp. 509-519, Varanasi et al.
Abrams Burton S.
Zeger Andrew E.
Gregory Bernarr E.
Zeger-Abrams Incorporated
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