Partial-response-channel precoding

Details Partial-response-channel precoding Partial-response-channel precoding

1992-02-03

1994-05-10

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 34, 375101, 371 378, 341106, H04L 2534, H04L 2549

Patent

active

053115473

ABSTRACT:
Digital data is transmitted over partial-response channels using a precoding technique which allows for the use of a wide variety of transmit constellations. A sequence of signal points is selected from a predetermined base constellation meeting particular criteria. A so-called combined signal point is developed for a present symbol interval by a) selecting a signal point from the base constellation as a function of input bits associated with the present symbol interval and b) combining the signal point thus selected with a feedback signal which is a function of one or more combined signal points that were developed for previous symbol intervals, that function being determined by the characteristic of the partial-response channel. A transmit signal which represents the combined signal points is then provided. In one implementation, the processing steps are performed explicitly using an integrated precoder/constellation mapper. In another implementation those steps are performed implicitly using table look-up.

REFERENCES:
patent: 4888775 (1989-12-01), Karabed et al.
patent: 5040191 (1991-08-01), Forney, Jr. et al.
patent: 5093843 (1992-03-01), Hirosaki et al.

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