An improved quantization scheme for lattice-reduction aided MIMO detection

Abstract

Lattice reduction aided (LRA) has been introduced recently by Yao and Wornell as a new type of MIMO detector. However, the quantization step of LRA detector is only suboptimal. In this paper, we propose a list quantization scheme to reduce the effect of quantization error. The method is to generate a list of candidate symbols from the original LRA estimated symbol. The simulation shows that improved performance can be obtained while additional complexity is reasonable small. The performance of LRA-MMSE with list quantization is shown to be very close to ML performance in both case, 4-QAM and 16-QAM modulation.