Method and apparatus for implementing adaptive tomlinson-harashima precoding in a digital data link
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United States of America Patent
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Aug 5, 2008
Grant Date -
Jun 16, 2005
app pub date -
Feb 19, 2003
filing date -
Feb 19, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a method for implementing adaptive Tomlinson-Harashima precoding using a digital data communications link. According to the method, the outgoing bit stream is coded into symbols, channel distortion is corrected by precoding (TML) the symbols, the precoded symbols are sent over a data communications channel (2, CHN), in which case the symbols, which have passed through the channel (2, CHN) and signal processing means for the receiver are reconstructed to form a bit stream. According to the invention, updated precoder coefficient parameter values are formed with the aid of an error variable (e), which is dependent on the symbol decisions (S') of the receiver, the output signal of a decision-feedback equalizer, and a signal (Q) that is formed from the received signal by compensating the effect of the precoder transfer function of the received signal with an inverse precoder transfer functions.
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