Blind Equalization for Digital Cable Transmission with Tomlinson-harashima Precoding and Shaping

A new system concept for high-rate digital transmission over twisted pair lines with precoding is presented. To avoid retransmission of channel data, lters at the transmitter side are xed and designed for a reference application. Intersymbol interference caused by mismatch of designed lters and actual situation, is cancelled by an adaptive FIR equalizer. Implementation is thereby simpli ed considerably compared to the case of optimum tuned lters, whereas the resulting SNR-loss is negligible. Because Tomlinson-Harashima precoding is not suited for many blind equalization algorithms, a modi cation of the precoder is proposed, resulting in a structure called dynamics shaping, which enables blind equalization by the Sato algorithm.