Wireless communication unit and method for DC offset estimation

A wireless communication unit comprising non-transitory logic for estimating at least one offset in a subcarrier that is subject to distortion in a multicarrier communication system, the wireless communication unit comprising:

• a receiver for receiving a plurality of subcarriers wherein the plurality of subcarriers contain the subcarrier that is subject to the distortion;
• logic for generating a plurality of first channel estimates for a respective plurality of received subcarriers that are not subject to the distortion;
• logic for processing a number of the plurality of first channel estimates for the respective 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;
• logic for 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.

A multicarrier wireless communication system comprising a wireless communication unit having non-transitory logic for estimating at least one offset in a subcarrier that is subject to distortion in a multicarrier communication system, the wireless communication system comprising:

• a receiver for receiving a plurality of subcarriers wherein the plurality of subcarriers contain the subcarrier that is subject to the distortion;
• logic for generating a plurality of first channel estimates for a respective plurality of received subcarriers that are not subject to the distortion;
• logic for processing a number of the plurality of first channel estimates for the respective 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;
• logic for 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.

A computer program product comprising program code embodied on non-transitory media for estimating at least one offset in a subcarrier that is subject to distortion in a multicarrier communication system, the computer program product comprising program code for:

• receiving a plurality of subcarriers wherein the plurality of subcarriers contain the subcarrier that is subject to the distortion;
• generating a plurality of first channel estimates for a respective plurality of received subcarriers that are not subject to the distortion;
• processing a number of the plurality of first channel estimates for the respective 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;
• 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.