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Factor-Graph-Based Soft-Input Soft-Output Detection for Frequency-Selective MIMO Channels

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3 Author(s)
Haselmayr, W. ; Inst. for Commun. Eng. & RF-Syst., Johannes Kepler Univ., Linz, Austria ; Etzlinger, B. ; Springer, A.

In this letter we consider a MIMO communication system with iterative detection over a frequency-selective MIMO channel. We present a soft-input soft-output MIMO detector based on a cyclic factor graph representation and the sum-product algorithm with two different message schedules (serial and parallel). Computer simulations show that both schedules provide near-optimum performance in terms of bit error rate, while achieving a remarkable reduction in complexity compared to the optimal MAP detector.

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Communications Letters, IEEE  (Volume:16 ,  Issue: 10 )