Title:Factor-Graph-Based Soft-Input Soft-Output Detection for Frequency-Selective MIMO ChannelsAuthor(s):Werner Haselmayr, Bernhard Etzlinger, Andreas SpringerAbstract: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.Journal:IEEE Communications LettersISSN:1089-7798Page Reference:page 1624 -1627, 4 page(s)Publishing:2012Volume:16Number:10