Pulse or digital communications – Systems using alternating or pulsating current – Antinoise or distortion
Reexamination Certificate
2003-02-19
2008-08-05
Vo, Don N (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Antinoise or distortion
C375S350000
Reexamination Certificate
active
07409003
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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Laamanen Heikki
Väänänen Jä{umlaut over (n)}në
Birch & Stewart Kolasch & Birch, LLP
Tellabs Oy
Vo Don N
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