A Method for Reducing the Decoding Complexity of Turbo MIMO

With the rapid increasing demand for wireless communication bandwidth, Multiple Input Multiple Output (MIMO) systems draw much attention because it’s able to provide higher capacity than single input single output (SISO) system.

Turbo-processing principle has been successfully applied to MIMO systems, one of them is called Turbo BLAST. We need a BLAST dempapper delivering a-posteriori probabilities (APP) about the coded bits. Full-APP detection would lead to prohibitive complexity.

LISS(LiSt-Sequential ) demapper accepts a priori probability and produce posteriori-information with reduced complexity. The decoding complexity reduction of Turbo BLAST can be achieved by applying sequential decoding technique on calculation of posteriori probability of demapper.

We made modification on the LISS algorithm by considering the ordering of the tree search in the LISS. Simulation results show that the performance of LISS with proper ordering will be better than that of LISS without proper ordering.