Method and apparatus for initializing equalizer coefficents usin

Details Method and apparatus for initializing equalizer coefficents usin Method and apparatus for initializing equalizer coefficents usin

1995-07-26

1997-06-03

Tse, Young T.

Pulse or digital communications

Equalizers

Automatic

375222, 375232, 364726, H04B 304, G06F 1714

Patent

active

056362447

ABSTRACT:
An apparatus and method for a data communications device such as a modem (100) to generate initial coefficient values for an equalizer (440) from a transmitted training signal received via a channel, in which the transmitted training signal has predetermined characteristics. The apparatus and method embodiments of the invention determine a finite impulse response characteristic of the inverse frequency response of the channel based on a received training signal and the transmitted training signal (610). In the various embodiments, an energy index, a magnitude index, and an offset index are generated and combined with an equalizer length index to select a sequence of initial coefficient values for the equalizer (630, 640, 650).

REFERENCES:
patent: 4027257 (1977-05-01), Perreault
patent: 4359778 (1982-11-01), Lee
patent: 4621366 (1986-11-01), Cain et al.

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