Spread spectrum signal demodulator

Details Spread spectrum signal demodulator Spread spectrum signal demodulator

1994-11-01

1995-11-14

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

375200, 375205, 375208, 375209, 380 34, 370 18, H04B 1707, H04J 1304

Patent

active

054673682

ABSTRACT:
A demodulator receiving as input signal a sum of a plurality of spread spectrum signals is disclosed. The demodulator comprises means for obtaining a correlation between a spreading code assigned to each of spread spectrum signals contained in the input signal and the input signal for each spread spectrum signal symbol and making the correlation thus obtained to be a 0-th detected correlation, a 1-st interference canceller stage for receiving as inputs the input signal and the 0-th detected correlation and outputting 1-st residual error signal, 1-st detected correlation and sum of the 0-th and 1-st detected correlations, and a plurality of interference canceller stages operable similarly to the 1-st interference canceller stage by receiving as input the output signal of the preceding interference canceller stage.

REFERENCES:
patent: 4189677 (1980-02-01), Cooper et al.
patent: 4553101 (1985-11-01), Mathis
patent: 4774715 (1988-09-01), Messenger
patent: 4933952 (1990-06-01), Albrieux et al.
patent: 4942591 (1990-07-01), Nease et al.
"Near-Far Resistance of Multiuser Detectors in Asynchronous Channels", R. Lupas, S. Verdu, IEEE Transactions on Communications, vol. 38, No. 4, Apr. 1990, pp. 496-508.

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