Method and apparatus for training linear equalizers in a PCM...

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

2006-07-11

2006-07-11

Bayard, Emmanuel (Department: 2631)

Pulse or digital communications

Transceivers

Modems

C375S231000, C375S233000, C375S295000

Reissue Patent

active

RE039165

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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