Method and apparatus for training linear equalizers in a PCM mod

Details Method and apparatus for training linear equalizers in a PCM mod Method and apparatus for training linear equalizers in a PCM mod

1997-06-13

1999-06-22

Pham, Chi H.

Pulse or digital communications

Transceivers

Modems

375231, 375233, 375295, H04B 138, H04L 516

Patent

active

059149825

ABSTRACT:
A pulse code modulation (PCM) modem system employs a relatively white training signal to optimize the adaptive filter coefficients in the receiver equalizers. During the training mode, any line coding or equivalent spectral shaping is disabled to provide a training signal sequence having a substantially even spectral content. The presence of DC within the training signal reduces the likelihood that the error function of the equalizers will settle at a local minimum. Following the training interval, the encoder enables the line coder to condition the digital input sequences, introduce DC nulls, and reduce the detrimental effects of baseline wander.

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