Low-Complexity Iterative Receiver for Coded MIMO-OFDM Systems Based on PIC-MRC

Wenfeng LIN  Chen HE  

IEICE TRANSACTIONS on Communications   Vol.E90-B    No.11    pp.3274-3277
Publication Date: 2007/11/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.11.3274
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
multiple-input multiple-output (MIMO),  orthogonal frequency division multiplexing (OFDM),  iterative,  parallel interference cancellation-maximum ratio combining (PIC-MRC),  extrinsic information transfer (EXIT),  

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A novel low-complexity iterative receiver for coded multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems is proposed in this letter. The iterative receiver uses the parallel interference cancellation (PIC)-maximum ratio combining (MRC) detector for MIMO-OFDM detection, which is a popular alternative to the minimum mean square error (MMSE) detector due to its lower computational complexity. However, we have found that the conventional PIC-MRC detector tends to underestimate the magnitude of its output log likelihood ratios (LLRs). Based on this discovery, we propose to multiply these LLRs by a constant factor, which is optimized according to the extrinsic information transfer (EXIT) chart of the soft-in soft-out (SISO) detector. Simulation results show that the proposed scheme significantly improves the performance of the PIC-MRC-based receiver with little additional cost in computational complexity, allowing it to closely approach the performance of receiver using the much more complex MMSE detector.