Patent ID: 8320510

Claim:
A method performed by one or more processors for performing bias removal from a received signal obtained after minimum mean square error (MMSE) equalization in a wireless communication system, comprising: permuting, performed by the one or more processors, an augmented matrix of channel estimates, for a plurality of spatial streams, to generate permuted augmented matrices of channel estimates for the plurality of spatial streams; performing, performed by the one or more processors, QR decomposition of the permuted augmented matrices to generate a unitary matrix and an upper triangular matrix for the plurality of spatial streams; rotating, performed by the one or more processors, a received signal of a first one of the spatial streams with a corresponding unitary matrix to generate a biased filtered output for the first spatial stream; and multiplying, performed by the one or more processors, the biased filtered output with a diagonal element of a corresponding upper triangular matrix to generate unbiased filtered output for the first spatial data stream.