| 摘要 |
This invention relates to a non-linear feedback equalizer for digital communication systems, comprising a pre-filter (PRE) including N filter coefficients c<5>, c<6>, ..., cN, a feedback filter (DFE) including M filter coefficients b<5>, b<6>, ..., bM and a nonlinear decision logic (32). The pre-filter (PRE) comprises 2N-1 taps (10x,y; 12x,y; 14x,y; 16x,y; 18x,y; 20x,y; 22x,y) with 2N-2 delay means (T) distributed therebetween, means (24x,y; 26x,y; 28x,y) for subtracting the output signal from tap 2N-k, where k is a positive integer assuming the values 1, ..., N-1, from the output signal from tap k, means for multiplying each such difference signal with the filter coefficient ck, means for multiplying the output signal from centre tap N with filter coefficient cN, and means for adding the output signals from all the multiplying means. |
