Maximum-likelihood sequence estimator with variable number of st

Details Maximum-likelihood sequence estimator with variable number of st Maximum-likelihood sequence estimator with variable number of st

1995-07-07

1997-07-01

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

371 45, G06F 1110

Patent

active

056446039

ABSTRACT:
A maximum-likelihood sequence estimator (MLSE) with a variable number of states. A channel response estimator calculates channel responses from a received signal having a predetermined burst length and a reference signal. A controller checks the latest (L-th) response having a larger power than a predetermined threshold value of the channel responses and determines the L number of effective channel responses having the larger power. A Viterbi equalizer with a variable number of states executes a maximum-likelihood sequence estimation on the basis of the trellis with M.sup.(L-1) states (M is a multi-value number of a modulation signal) using the L number of effective channel responses. The MLSE is operated with the minimum number of states every burst to reduce an average processing amount without degrading characteristics and to achieve a low consumption power of receivers.

REFERENCES:
patent: 5164961 (1992-11-01), Gudmundson
patent: 5325402 (1994-06-01), Ushirokawa
patent: 5479419 (1995-12-01), Naoi et al.
G. David Forney, Jr., "Maximum-Likelihood Sequence Estimation of Digital Sequences in the Presence of Intersymbol Interference", pp. 363-378, May 1972.
Gottfried Ungerboeck, "Adaptive Maximum-Likelihood Receiver for Carrier-Modulated Data-Transmission Systems", pp. 624-636, May 1974.
Alexandra Duel-Hallen, "Delayed Decision-Feedback Sequence Estimation", pp. 428-436, May 1989.

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