Patent ID: 8848778
Filing Date: 2014-09-30
Classification: H04B,H04L

Abstract:
1. A method of generating impairment covariance estimates for equalization in a receiver of a wireless communication system, wherein the receiver is equipped with multiple antennas, and wherein an impairment covariance matrix is used to calculate equalization weighting vector for signals transmitted by a transmitter, the method comprising: calculating a raw impairment covariance estimate between a first antenna and a second antenna of the multiple antennas, for each of a plurality of subcarriers allocated to the transmitter in frequency domain; transforming the raw impairment covariance estimates into time domain; masking the transformed impairment covariance estimates by a triangle window with a width defined by a maximum delay spread; determining a threshold, based on the transformed impairment covariance estimates, and thresholding the masked impairment covariance estimates with the determined threshold; and transforming the thresholded impairment covariance estimates into frequency domain to form the impairment covariance matrix.