Efficient Detector for LDPC Coded MIMO System

This paper presents a reduced-complexity soft-input soft-output detection scheme for low-density parity-check (LDPC) coded multiple-input multiple-output (MIMO) wireless communication systems employing turbo processing at the receiver. The detection algorithm is decomposed into the preprocessing and tree search stages. In preprocessing stage, we give an unbiased minimum mean-square error (MMSE) filtering algorithm to order and to preprocess the MIMO channel matrix. Then, accumulated metric including a priori information is given. In the tree search stage, we propose a simple modification to TM algorithm by partial length paths augmenting. The proposed detector provides flexible performance-complexity tradeoff. In addition, it is robust to arbitrary MIMO channels. The excellent performance of this detector is demonstrated via simulation results in several MIMO channels.