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

Author

Haselmayr, Werner ; Etzlinger, Bernhard ; Springer, Andreas

Author_Institution

Inst. for Commun. Eng. & RF-Syst., Johannes Kepler Univ., Linz, Austria

Volume

16

Issue

10

fYear

2012

fDate

10/1/2012 12:00:00 AM

Firstpage

1624

Lastpage

1627

Abstract

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.

Keywords

MIMO communication; error statistics; graph theory; maximum likelihood detection; wireless channels; MIMO communication system; bit error rate; cyclic factor graph representation; factor-graph-based soft-input soft-output detection; frequency-selective MIMO channels; iterative detection; optimal MAP detector; soft-input soft-output MIMO detector; sum-product algorithm; Bit error rate; Complexity theory; Detectors; MIMO; Schedules; Vectors; Factor graph; MAP; MIMO; SPA; frequency-selective channel; iterative detection; spatial multiplexing;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2012.082012.121337

Filename

6287518