Single-user decoder metrics for subtractive interference...

Details Single-user decoder metrics for subtractive interference... Single-user decoder metrics for subtractive interference...

2006-04-25

2006-04-25

Burd, Kevin (Department: 2631)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S130000, C375S136000, C375S144000, C375S147000, C375S148000, C375S150000, C370S441000, C370S434000, C370S320000, C370S335000, C370S342000

Reexamination Certificate

active

07035317

ABSTRACT:
Improved branch metrics for Viterbi decoders in CDMA systems take into account the time dependency of the variance of the multiple access interference in any user's signal after the single-user detector, and the time dependency of the residual multiple access interference in any user's signal after subtractive interference cancellation is applied in two-stage detectors. The (residual) multiple access interference can be modeled as a Gaussian random variable with time dependent variance. Modeling the RMAI in such a way reduces the bit error rate in CDMA systems.

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