Patent ID: 8213525

Claim:
A method of estimating and removing noise in OFDM systems, comprising the steps of: receiving a set of OFDM symbols from a channel on a receiver, the set representing transmission of modulated data after an inverse Fourier transform and insertion of a cyclic prefix; removing the cyclic prefix from the set of OFDM symbols; performing a fast Fourier transform on the set of OFDM symbols; estimating impulse noise in the transformed set of OFDM symbols; canceling the impulse noise in the transformed set of OFDM symbols based upon the estimated impulse noise to produce a set of impulse noise-free data; estimating the channel utilizing a pilot-based method; demodulating and detecting the transmitted modulated data based upon the estimated channel and the set of impulse noise-free data; and wherein the step of estimating the impulse noise includes insertion of free carriers across a frequency spectrum, the free carriers being inserted randomly.