Patent ID: 7664186
Filing Date: 2010-02-16
Classification: H04L

Abstract:
1. A method for processing received channel coded data symbols in an orthogonal frequency division multiplexing (OFDM) system with a plurality of sub-carriers, the received channel coded data symbols being affected by a disturbance caused by a DC offset with a concurrent carrier-frequency offset in the received channel-coded data symbols in a multicarrier system with two or more sub-carriers, comprising: determining reliability information for channel decoding for two or more sub-carriers of the plurality of sub-carriers, wherein the reliability information represents a probability with which a channel decoded data symbol corresponds to a transmitted data symbol; correcting the reliability information based on a magnitude of the disturbance; and weighting input values to a channel decoder with the corrected reliability information, wherein the correction is carried out by multiplication of the reliability information by a factor M, wherein M is a function of at least one of the DC offset and carrier-frequency offset, and wherein the factor M is chosen to be a smaller value the closer the sub-carrier is to a frequency of the carrier-frequency offset.