Compensation for non-linear distortion in a modem receiver
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United States of America Patent
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Feb 6, 2007
Issued Date -
N/A
app pub date -
May 10, 2004
filing date -
Aug 31, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method and modem receiver for receiving serial data from a transmission link, for recovering data from the received data, and for synchronizing the receiver timing to that of the transmitter are disclosed. A receiver equalizer includes a filter and quantizer in the forward path and a feedback circuit connecting the quantizer output to the filter input. A measuring circuit is used to initialize the feedback circuit. The receiver filter, provided as a QMF wavelet filter bank, is implemented in one embodiment with a form of polyphase filtering followed by four M/2-point FFTs. The quantizer recovers data symbols and provides a quantization error feedback signal. The measuring circuit provides an approximation of phase and amplitude of isolated wavelets.
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