Patent ID: 8160164

Claim:
A computer implemented method for estimating at least one offset of a communication in a multicarrier communication system, the method comprising: receiving a plurality of subcarriers wherein at least one of the plurality of subcarriers contain a subcarrier that is subject to the distortion; generating a plurality of first channel estimates for a plurality of received subcarriers that are not subject to the distortion; processing a number of the plurality of first channel estimates for the plurality of received subcarriers that are not subject to the distortion to generate a second channel estimate for the subcarrier that is subject to the distortion; and estimating an offset associated with the subcarrier that is subject to the distortion by: receiving a known reference signal transmitted for the subcarrier that is subject to the distortion, multiplying the second channel estimate with the known reference signal to produce a first value, and subtracting the first value from the received known reference signal to produce the estimated offset, wherein the estimated offset is a direct current offset estimate of a direct current subcarrier that is subject to distortion and the direct current subcarrier is not nulled and is used for transmission of data.