Patent ID: 7133444

Claim:
A method of demodulating a received Discrete Multitone (DMT) signal, comprising: applying a first time-domain equalizer to the received signal to produce an equalized time domain sampled signal arranged in frames; performing a first Discrete Fourier Transform on the equalized time-domain sampled signal to produce an initial transform result; applying a sliding transform matrix to a subset of the initial transform result; adding a difference between selected samples of the equalized time domain sampled signal to the result of the applying a sliding transform matrix step to produce an accumulated sum; multiplying the accumulated sum by a per-tone equalizer coefficient; shifting the subset of the initial transform result by a sample position; repeating the applying a sliding transform matrix step adding, multiplying, and shifting steps for a plurality of iterations wherein the rereated multiplying step comprises producing an accumulated result by accumulating result of repeated multiplying step with result of a previous multiplying step; and applying a frequency domain equalizer to a last accumulated per-tone equalizer result to recover an estimate of a frame of the DMT signal.