Patent ID: 7369607
Filing Date: 2008-05-06
Classification: H04L

Abstract:
1. An apparatus, comprising: a receiver configured to receive multi-tone signals, wherein the receiver has a Time Domain Equalizer filter employing an algorithm to shorten a length of an incoming impulse response to equal to or less than a guard period by calculating a minimum mean square error solution in combination with measuring an inter-symbol interference of a channel, wherein the algorithm is further configured to calculate an estimation of a first value for a center delay to shift an impulse response to a beginning of a block of time domain data in a multiple tone signal; create a set of values around the first value estimate to shift the impulse response that includes at least the first value for the delay and a second value for the delay; calculate a first minimum mean square error to determine coefficients of the Time Domain Equalizer filter based up the first value for the delay so that the length of the overall impulse response is approximately equal to or smaller than a guard period; receive a measurement of a first value of an inter-symbol interference of a channel after the first minimum mean square error is applied to the multiple tone signal; select the second value for the delay, where the second value deviates a fixed amount from the first value for the delay; and calculate a second minimum mean square error based on the second value for the delay.