Threshold cancellation means for use in digital mobile radio net

Details Threshold cancellation means for use in digital mobile radio net Threshold cancellation means for use in digital mobile radio net

1994-06-07

1995-05-23

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 34, 370 18, 455 501, 455 511, 455 63, 455296, 455297, 375206, 375346, 375349, H04L 2730, H04B 110

Patent

active

054188148

ABSTRACT:
In a direct sequence spread spectrum code division multiple access receiver using interference cancellation, the signal for cancellation is derived by demodulating the unwanted signals and re-modulating a carrier to create a near replica for subtraction from a delayed version of the total received signal. Errors in the demodulation process degrade the cancellation. The present invention provides an optimal way of using the reliability information in the demodulator decision variable either to turn the cancellor off for unreliable bit decisions or to partially disable the cancellor according to the bit reliabilities.

REFERENCES:
patent: 4470138 (1984-09-01), Gutleber
patent: 5099493 (1992-03-01), Zeger et al.
patent: 5105435 (1992-04-01), Stilwell
patent: 5224122 (1993-06-01), Bruckert
patent: 5235612 (1993-08-01), Stilwell et al.
patent: 5325394 (1994-06-01), Bruckert

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