Adaptive-sequence-estimation apparatus employing diversity...

Details Adaptive-sequence-estimation apparatus employing diversity... Adaptive-sequence-estimation apparatus employing diversity...

H - Electricity

04

B

H04B 1/10 (2006.01) H04B 7/08 (2006.01)

Patent

CA 2097152

A diversity receiver employing maximum-likelihood-sequence estimation employs a separate channel estimator (44-1, ... , 44-L) for each of a plurality of diversity channels. Each channel estimator (44-1, ..., 44-L) produces channel-model parameters ([f ~], ..., [f~~]) that characterize their respective channels. A weighting-and-accumulation circuit (56) computes the responses of the thus-represented models to candidate symbol sequences, and metrics indicating the likelihoods that respective candidate sequences were the sequences actually sent are determined by comparing the model output with the received signal in a comparison circuit (58) and squaring the magnitudes of the results in a squaring circuit (60). The receiver then employs a Viterbi algorithm (62) to determine which sequence is the one most likely to have been sent. In one version, it does this on the basis of the metrics calculated for the channel whose signal is strongest, while it determines the metrics by combining partial metrics from all of the channels in another version.

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