Adaptive-sequence-estimation apparatus employing diversity combi

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

1992-06-08

1997-04-15

Chin, Wellington

Pulse or digital communications

Receivers

Interference or noise reduction

375341, 375349, 455133, 455272, 371 43, H04L 102, H03D 100

Patent

active

056217692

ABSTRACT:
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.sub.1 ], . . . , [f.sub.L ]) 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.

REFERENCES:
patent: 4504872 (1985-03-01), Peterson
patent: 4550415 (1985-10-01), Debus, Jr. et al.
patent: 4564952 (1986-01-01), Karabinis et al.
patent: 4584713 (1986-04-01), Bruckert et al.
patent: 4710945 (1987-12-01), Bocci et al.
patent: 4885757 (1989-12-01), Provence
patent: 5031193 (1991-07-01), Atkinson et al.
patent: 5111481 (1992-05-01), Chen et al.
patent: 5150381 (1992-09-01), Forney, Jr. et al.
patent: 5163044 (1992-11-01), Golden
patent: 5191598 (1993-03-01), Buckstram et al.
patent: 5202903 (1993-04-01), Okanone
patent: 5203027 (1993-04-01), Nounin et al.
patent: 5263053 (1993-11-01), Wan et al.
S. Narayan, "Fractionally Spaced Equalization for Analog Cellular Data Modems," IEEE Pacific Rim Conference on Communication, Computers and Signal Processing, May 9-10, 1991, pp. 534-537.
Sheen, Wern-Ho, "MLSE Equalization and Decoding for Multipath Fading Channels," IEEE Transactions on Communications, vol. 39, No. 10, Oct. 1991.
Jakes, W.C., Jr., Yeh, Y.S., Gans, M.J., Reudink, D.O., "Fundamentals of Diversity Systems," Microwave Mobile Communications, W.C. Jakes, ed., New York:Wiley 1974.
Forney, G. David, Jr., "Maximum-Likelihood Sequence Estiimation of Digital Sequences in the Presence of Intersymbol Interference," IEEE Transactions on Information Theory, vol. IT-18, No. 3, May 1972.
Magee, Francis R., Jr. and Proakis, John G., "Adaptive Maximum-Likelihood Sequence Estimation for Digital Signaling in the Presence of Intersymbol Interference," IEEE Transactions on Information Theory, Jan. 1973.
Eyuboglu, M. Vedat, and Qureshi, Shahid U.H., "Reduced-State Sequence Estimation with Set Partitioning and Decision Feedback," IEEE Transactions on Communications, vol. 36, No. 1, Jan. 1988.

Affiliated with

Also associated with

Rating

Adaptive-sequence-estimation apparatus employing diversity combi does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Adaptive-sequence-estimation apparatus employing diversity combi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive-sequence-estimation apparatus employing diversity combi will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-367426