Patent ID: 9143364
Filing Date: 2015-09-22
Classification: H04L

Abstract:
1. A method for estimating a gain and phase imbalance between an in-phase path and a quadrature-phase path of a receiver, the method comprising: for each of a plurality of subcarrier pairs, adding a first symbol received over a first subcarrier of the subcarrier pair with a complex conjugate of a second symbol received over a second subcarrier of the subcarrier pair to form a statistic, wherein the number of subcarrier pairs in the plurality of subcarrier pairs is determined based on one or more signal-to-noise ratios associated with the plurality of subcarrier pairs; determining two channel estimates using the statistics formed for the plurality of subcarrier pairs and using known values of the first and second symbols received over each of the plurality of subcarrier pairs; and estimating the gain and phase imbalance using at least the two channel estimates and the first and second symbols received over each of the plurality of subcarrier pairs.