Scaled Matched Filter Based Iterative Receiver for Coded MIMO-OFDM Systems

In this paper, we propose a reduced complexity iterative receiver for coded multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. We apply the matched filter (MF) in the proposed scheme, which is a popular alternative to the minimum mean square error (MMSE) detector due to its lower computational complexity. We improve the well studied MF-based iterative MIMO soft-detector by scaling the value of the a priori information from a soft-in soft-out (SISO) channel decoder. The scaling factor is optimized according to the extrinsic information transfer (EXIT) chart of the SISO detector. Simulation results show that the proposed MF- based iterative receiver significantly outperforms the conventional one with little additional cost in computational complexity and achieves bit error rate (BER) performance comparable to that of the MMSE-based iterative receiver with much lower complexity.