Noise-immune space diversity receiver

Details Noise-immune space diversity receiver Noise-immune space diversity receiver

1991-04-01

1993-04-13

Chin, Stephen

Pulse or digital communications

Spread spectrum

Direct sequence

375 94, 375 96, 375102, H04B 710, H04L 102

Patent

active

052029034

ABSTRACT:
In a space diversity receiver, matched filters and a like number of channel estimators are respectively coupled to diversity antennas to receive sequentially coded symbol sequences. A branch metric calculator receives the outputs of the matched filters and the estimates from the channel estimators to calculate a branch metric of the received sequences for coupling to a maximum likelihood (ML) estimator. The branch metric is obtained by summing branch metric coefficients derived from channel estimates respectively with the output of the matched filters or by summing branch metric coefficients derived from a vector sum of channel estimates with the matched filter outputs. In another embodiment, adaptive channel estimators are provided for deriving channel estimates from received sequences and the output of an ML estimator. First branch metrics are derived from the received sequences and supplied to a branch metric quality estimator in which quality estimates of the channels are derived from the first branch metrics. An evaluation circuit evaluates the first branch metrics according to the quality estimates and produces a second branch metric for coupling to the ML estimator.

REFERENCES:
patent: 4160952 (1979-07-01), Seastrand, Jr.
patent: 4733402 (1988-03-01), Monsen
patent: 5031193 (1991-07-01), Atkinson et al.
patent: 5065411 (1991-11-01), Muto
Adaptive Matched Filter and its Significance to Anti-multipath Fading, by Kojiro Watanabe, C&C Systems Research Laboratories, NEC Corporation, pp. 1455-1459.
A New Post-detection Selection Diversity with MLSE Equalization, by Kazuhiro Okanoue et al. C&C Systems Research Laboratories, NEC Corporation, pp. 2-172.
The Viterbi Algorithm Applied to Digital Data Transmission, by J. F. Hayes, pp. 15-20.
Adaptive Equalization of the Slow Fading Channel, by Peter Monsen, IEE Transactions on Communications, vol. COM-22, No. 8, aug. 1974, pp. 1064-1075.

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