Patent ID: 6760373
Filing Date: 2004-07-06
Classification: H04L

Abstract:
An intersymbol interference reduction system comprising:a frequency domain equalizer; and a constellation decoder, the frequency domain equalizer determining at least one received point based at least on at least one previously determined constellation point wherein a sub-channel output for the frequency domain equalizer for a subchannel m1 and frame i1 are determined in accordance with: si1m1&Wedge;=&Sum;{m,j}&Element;A&it;(m1)&it;Î»jm&it;(m1)&it;Î¸i1+jm+&Sum;{m,j}&Element;B&it;(m1)&it;Î³jm&it;(m1)&it;di1+jmwhere A(m1) is a set containing ordered pairs {m, j} of indices corresponding to the particular subchannel, frame pairs for which the receiver transform outputs are used in the frequency domain equalizer, for subchannel m1, B(m1) is a set containing ordered pairs {m, j} of indices corresponding to the particular subchannel, frame pairs for which decisions are used in the frequency domain equalizer for subchannel m1, &lgr;jm(m1) are the corresponding frequency domain equalizer weights, &thgr;im represents the transform output for subchannel m, in frame i, &ggr;jm is the corresponding combiner weights and di1m1 is a value for si1m1 determined by quantizing si1m1&Wedge;to the nearest constellation point.