Patent ID: 7251273
Filing Date: 2007-07-31
Classification: H04L

Abstract:
1. A method in an OFDM receiver for generating an equalizer coefficient for equalization of a received wireless signal by a frequency equalizer, the method including: identifying first and second long preambles from the received wireless signal; determining in a channel estimator an equalization coefficient for a selected frequency based on a minimized cost function for the first and second long preambles relative to a prescribed preamble value for the selected frequency; and supplying the equalization coefficient for the selected frequency to the frequency equalizer for said equalization of the received wireless signal by the frequency equalizer; wherein the determining step includes: generating complex conjugate values for the first and second long preambles, respectively, applying the complex conjugate values to the first and second long preambles, respectively, according to the minimized cost function, to obtain a complex coefficient specifying the complex conjugate values relative to square magnitudes of the first and second long preambles, and multiplying the complex coefficient with the prescribed preamble value to obtain the equalization coefficient for the corresponding selected frequency.