Spectrally constrained impulse shortening filter for a discrete multi-tone receiver

Abstract

A channel in a multiple carrier communication system is equalized by computing a target spectral response, shortening the impulse response of the channel so that a significant part of an energy of the impulse response is confined to a region that is shorter than a target length and filtering the signal based on the target spectral response.

1 . A method for equalizing a channel in a multiple carrier communication system, the channel being configured to receive a signal and including a spectrally constrained impulse shortening filter, the method comprising:
 measuring received noise power spectral density;   computing a target spectral response based on the measured noise power;   selecting a frequency response of the spectrally constrained impulse shortening filter based on the target spectral response; and   filtering the communication signal with the spectrally constrained impulse shortening filter.