NDLI: Reduced-Complexity Approx-Log-MAP and Max-Log-MAP Soft PSK/QAM Detection Algorithms

Content Provider	IEEE Xplore Digital Library
Author	Chao Xu Dandan Liang Sugiura, S. Soon Xin Ng Hanzo, L.
Copyright Year	1972
Abstract	In this paper, we propose to reduce the complexity of both the Approx-Log-MAP algorithm as well as of the Max-Log-MAP algorithm conceived for generalized PSK/QAM detection, where only a reduced-size subset of the PSK/QAM constellation points is taken into account for producing a single soft-bit output. Although the detectors of Gray-labelled low-order PSK/QAM schemes generally produce near-horizontal EXIT curves, our proposed detectors exploit the a priori LLRs gleaned from a channel decoder in order to retain the optimum detection capability for all PSK/QAM constellations. Furthermore, we demonstrate in this paper that the widely applied MIMO schemes including V-BLAST and STBC, which invoke the proposed soft PSK/QAM detectors may also benefit from our reduced-complexity design. Our simulation results confirm that a near-capacity performance may be achieved by the proposed detectors at a substantially reduced detection complexity.
Starting Page	1415
Ending Page	1425
Page Count	11
File Size	582516
File Format	PDF
ISSN	00906778
Volume Number	61
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Quadrature amplitude modulation Phase shift keying Complexity theory Detectors Measurement Tin Detection algorithms STBC Reduced-complexity approx-log-MAP max- log-MAP turbo detection bit metric generation Gray-labelling PSK square QAM star QAM cross QAM V-BLAST
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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