Patent ID: 8064550
Filing Date: 2011-11-22
Classification: H04L

Abstract:
1. A method for removing quadrature imbalance errors in received data, the method comprising: accepting an unbiased training sequence in a quadrature demodulation receiver, the unbiased training sequence having a uniform accumulated power evenly distributed in a complex plane, and including predetermined reference signals (p) at frequency +f and predetermined mirror signals (p processing the unbiased training sequence, generating a sequence of processed symbols (y) at frequency +f, representing complex plane information in the unbiased training sequence; multiplying each processed symbol (y) by the mirror signal (p obtaining an unbiased quadrature imbalance estimate B wherein accepting the unbiased training sequence includes accepting a temporal sequence of n predetermined mirror signals (p wherein generating the sequence of processed symbols (y) includes generating a temporal sequence of n processed symbols (y wherein obtaining the unbiased quadrature imbalance estimate (B