Patent ID: 9698917
Date: 2017-07-04
CPC Classifications: H04B,H04L,H04W

Claim:
1. An apparatus comprising: at least one processor; memory storing a program of instructions; wherein the memory storing the program of instructions is configured to, with the at least one processor, cause the apparatus to at least: receive one or more data frames transmitted to a direct conversion receiver operating in a wireless access network; examine a preamble of each data frame to determine whether the subcarrier transmitting the data frame exhibits linear independence; for each subcarrier exhibiting linear independence, perform preamble-based estimation to estimate in-phase/quadrature imbalance using frequency domain symbols appearing in the preamble; perform blind estimation to estimate the phase/quadrature imbalance of subcarriers that have not been determined to exhibit linear independence; generate an overall in-phase/quadrature imbalance estimate based on the preamble-based estimate and the blind estimation; and perform compensation based on the overall in-phase quadrature imbalance estimate.