Method and apparatus for training linear equalizers in a PCM modem
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United States of America Patent
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Jul 11, 2006
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N/A
app pub date -
May 4, 2001
filing date -
Jun 13, 1997
priority date (Note) -
Expired
status (Latency Note)
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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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