Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1992-12-02
1995-07-11
Chin, Stephen
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
375349, H03D 100, H04L 2706
Patent
active
054328217
ABSTRACT:
A method for selecting the best survivor from a plurality of surviving possible distal data symbols creates a channel estimate for each of the survivors independent of the others. The likelihood of each survivor is then evaluated, whereupon the most likely survivor is selected. The likelihood of each survivor is computed based only on its own channel estimate. A data sequence estimation system includes a memory for storing a plurality of "surviving" sequences. For each stored survivor, the system includes a channel estimator and a metrics computer, which calculates a measure of the likelihood of the survivor as a function of the survivor itself, the observed input, and the parameters of the associated channel estimator. The system also includes a processor that accumulates the metric and selects a best survivor as a function of a computed maximum likelihood. There is no need to feed back the best survivor to update a single channel estimator, since, when the survivor has been selected, the associated channel estimator is already established.
REFERENCES:
patent: 5146475 (1992-09-01), Kubo
patent: 5191598 (1993-03-01), Backstrom et al.
patent: 5202903 (1993-04-01), Okanoue
patent: 5272727 (1993-12-01), Okanoue
A. Duel-Hallen, C. Heegard, "Delayed Decision-Feedback Sequence Estimation," I.E.E.E. Transactions on Communications, vol. 37, pp. 428-436, May 1989.
P. R. Chevillat, E. Eleftheriou, "Decoding of Trellis-Encoded Signals in the Presence of Intersymbol Interference and Noise" I.E.E.E. Transactions on Communications, vol. 37, pp. 669-676, Jul. 1989.
M. V. Eyeboglu, S. U. H. Qureshi, "Reduced-State Sequence Estimation with Set Partitioning and Decision Feedback,", I.E.E.E. Transactions on Communications, vol. 36, pp. 13-20, Jan. 1988.
A. J. MacDonald, J. B. Anderson, "PLL Synchronization for Coded Modulation," Conf. Rec. ICC '91, pp. 52.6.1-52.6.5, Jun. 1991.
Polydoros Andreas
Raheli Riccardo
Chin Stephen
University of Southern California
Vo Don
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