Combined Forward and Backward Lattice Reduction Aided MMSE Detection in MIMO Systems

This paper proposes a combined forward and backward lattice reduction scheme to improve estimation of transmitted signals in lattice-reduction aided (LRA) MMSE MIMO systems. The cross-correlation between the forward and the backward transform matrices is also analyzed to make sure that the proposed detector achieves more reliable estimates. The proposed detector achieves better BER performance than the conventional LRA detector. The achieved BER curve is improved by 3.5 dB at BER=10^-5 over the curve of the conventional LRA MMSE detector in the 8times8 MIMO.