Transmission channel characteristic equalizer

Details Transmission channel characteristic equalizer Transmission channel characteristic equalizer

1992-06-24

1994-04-12

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 94, 371 43, H03H 730

Patent

active

053032632

ABSTRACT:
An equalizer including a channel estimator allowing a Viterbi algorithm processor to estimate transmitted symbols accurately, so that the impulse response of a transmission channel may not deviate from the correct one. The equalizer outputs an transmitted symbol sequence estimate having the largest path metric by correcting the channel impulse response by parameter coefficients of the LMS (Least Mean Square) or RLS (Recursive Least Square) algorithm, by compensating for phase fluctuations due to the frequency offset and phase jitter of received signals, or by using a sequence included in an intermediate portion of a TDMA (Time Division Multiple Access) frame format.

REFERENCES:
patent: 4833693 (1989-05-01), Eyuboglu
patent: 4862481 (1989-08-01), Dzung
patent: 5090025 (1992-02-01), Marshall et al.
patent: 5099499 (1992-03-01), Hammar
patent: 5164961 (1992-11-01), Gudmundson
John G. Proakis, Digital Communications, McGraw-Hill, Inc., 2nd ed., 1989, pp. 610-643.
Gottfied Ungerboeck, "Adaptive Maximum-Likelihood Receiver for Carrier-Modulated Data-Transmission ystems", IEEE Transactions on Communications, May 1974 pp. 624-636.

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