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We propose a low-complexity soft detector for coded MIMO systems, which generates soft information by combining the hard-decision maximum likelihood (ML) estimate with the soft information generated by the minimum mean square error (MMSE) detector. The hard-decision ML estimate is produced by a modified MMSE based sphere decoder (MMSE-SD). The MMSE-SD is desired since it has lower average and worst-case computational complexity than the zero-forcing (ZF) based SD (ZF-SD) and can be used for arbitrary MIMO configurations. The proposed modification simplifies the implementation of the MMSE-SD, and it can be efficiently implemented by previously proposed complex ZF-SD architecture with minor modification. Our soft detector offers a low-complexity alternative when list based soft detectors are not affordable.
Published in:
Circuits and Systems, 2008. ISCAS 2008. IEEE International Symposium on
Date of Conference: 18-21 May 2008
- Page(s):
- 312 - 315
- E-ISBN :
- 978-1-4244-1684-4
- Print ISBN:
- 978-1-4244-1683-7
- INSPEC Accession Number:
- 10048494
- Conference Location :
- Seattle, WA
- Digital Object Identifier :
- 10.1109/ISCAS.2008.4541417
- Product Type:
- Conference Publications
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