Power Reduction through Upper Triangular Matrix Tracking in QR Detection MIMO Receivers

QR decomposition is a computationally intensive process often required for MIMO detection. A technique that allows a reduction in the computational complexity of MIMO QR detection receivers is proposed for non-stationary channel . The technique involves tracking of the upper triangular matrix and reduction of the frequency of QR decomposition. This reduction comes at the cost of increased equalization error from the outdated Q matrix that must be used between successive QR decompositions. When compared to the similar setup but with the channel matrix tracking, the proposed method yields 33% computational complexity reduction without any loss of performance.