Pulse or digital communications – Repeaters – Testing
Patent
1992-12-16
1994-09-06
Cangialosi, Salvatore
Pulse or digital communications
Repeaters
Testing
H04K 100
Patent
active
053454685
ABSTRACT:
Despreading of the received signal in a CDMA system is provided using code coefficient sequences which are derived from those utilized by the system users to encode their respective symbols. Each derived code coefficient sequence is a function of the correlation between a different user's code coefficient sequence and the code coefficient sequences of all other users. Advantageously, this technique substantially reduces interference effects and is suitable for use in the despreader of differentially or nondifferentially coded CDMA systems.
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U.S. Patent Application Ser. No. 07/982,168, filed on Nov. 24, 1992, entitled Data Recovery Technique for Asynchronous CDMA Systems (Q. Bi Case 3).
R. Lupas and S. Verdu, "Near-Far Resistance of Multiuser Detectors in Asynchronous Channels," IEEE Transactions on Communications, vol. 38, No. 4, Apr. 1990, pp. 496-507.
AT&T Bell Laboratories
Cangialosi Salvatore
Padnes David R.
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