Modified V-BLAST Symbol Detection Under Channel Uncertainties for MIMO Systems

The performance of V-BLAST symbol detection can be seriously degraded if channel information is not perfect. We derive a new nulling matrix at the receiver solving the min-max problem which is robust to the statistical changes of channel error. Using the new nulling matrix, we propose a modified vertical Bell laboratories layered space-time(V-BLAST) detection algorithm to reduce unexpected effects of channel uncertainties. The proposed algorithm requires only one more scalar value, the maximal norm of a channel error matrix, than the conventional algorithm does, but the performance is better especially at the high SNR. We simulate the proposed algorithm under correlated MIMO channels with Gaussian channel coefficients.