Patent ID: 6252904
Filing Date: 2001-06-26
Classification: G01R,H03M,H04B,H04L

Abstract:
A method for providing an input signal to a symbol decoder, the input signal being based on a tail value and a subset of coefficient values received from a decision feedback equalizer, the method comprising the operations of:(a) generating a set of pre-computed values in a multiple decision feedback equalize, the pre-computed values being based on the subset of coefficient values;(b) combining each of the pre-computed values with the tail value to generate a tentative sample;(c) selecting one of the tentative samples as the input signal to the symbol decoder;(d) storing the tentative samples in a set of registers;(e) outputting the stored tentative samples to a multiplexer, the multiplexer selecting one of the tentative samples as the input signal to the symbol decoder;wherein the operation of storing the tentative samples in the registers before providing the tentative samples to the multiplexer facilitates high-speed operation by breaking up a critical path of computations into substantially balanced first and second portion, the first portion including computations in the decision-feedback equalizer and the multiple decision feedback equalizer, the second portion including computations in the symbol decoder; andsaturating the tentative samples and providing the saturated tentative samples to the registers.