Patent ID: 7362812
Filing Date: 2008-04-22
Classification: H04L

Abstract:
1. A method in an OFDM receiver for updating equalizer coefficients for equalization of a received wireless OFDM signal by a frequency equalizer, the method including: first determining, for each subcarrier frequency of an OFDM symbol, a digital-based error value between an equalized signal output by the frequency equalizer and a prescribed predicted signal optimized for the OFDM receiver; second determining an accumulated error based on accumulating the digital-based error values of the respective subcarrier frequencies in the OFDM symbol with respective digital-based error values for a prescribed successive number of OFDM symbols; third determining a step size based on the accumulated error relative to a prescribed step function configured for optimizing the equalizer coefficients within prescribed stability limits; and generating updated equalizer coefficients for the respective subcarrier frequencies based on applying a correction factor to the equalizer coefficients, the correction factor based on the accumulated error and the step size.