Method for self-training adaptive equalization

Details Method for self-training adaptive equalization Method for self-training adaptive equalization

1991-10-22

1994-06-07

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 13, 375101, 3647242, H03H 730, H03H 740

Patent

active

053196740

ABSTRACT:
A method is disclosed for adapting, in a self-training procedure, an equalizer based on distributed-arithmetic design. In such an equalizer, in each modulation interval addresses are derived from stored received signal samples x.sub.n.sup.q to choose some of the values stored in a look-up table. The chosen table values are combined by shift-and-add operations to obtain an equalizer output value y.sub.n. According to the novel adaptation scheme, only one of the chosen look-up table values is selected per modulation interval, for updating it in a particular fashion to reduce the error detected. The disclosed scheme ensures uniform selection of the stored look-up table values for updating. Only one additional shift-and-add operation is required per modulation interval to achieve satisfactory adaptation of the equalizer. No training sequence is required to be transmitted, and the scheme converges in all situations.

REFERENCES:
patent: 4635276 (1987-01-01), Karabinis
patent: 4694451 (1987-09-01), Adams et al.
patent: 4829463 (1989-05-01), Kakishita et al.
patent: 5132988 (1992-07-01), Fisher et al.
patent: 5164962 (1992-11-01), Nakai et al.

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