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Reduced-complexity approx-log-MAP and max-log-MAP soft PSK/QAM detection algorithms

Reduced-complexity approx-log-MAP and max-log-MAP soft PSK/QAM detection algorithms
Reduced-complexity approx-log-MAP and max-log-MAP soft PSK/QAM detection algorithms
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.
Xu, Chao
349b7322-fd17-4fcd-a49f-c62afe284d50
Liang, Dandan
7ec17ba1-8959-4ee0-8f58-2e51c646ae23
Sugiura, Shinya
acb6e7ea-eb0c-4b33-82c6-da8640be4233
Ng, Soon Xin
e19a63b0-0f12-4591-ab5f-554820d5f78c
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Xu, Chao
349b7322-fd17-4fcd-a49f-c62afe284d50
Liang, Dandan
7ec17ba1-8959-4ee0-8f58-2e51c646ae23
Sugiura, Shinya
acb6e7ea-eb0c-4b33-82c6-da8640be4233
Ng, Soon Xin
e19a63b0-0f12-4591-ab5f-554820d5f78c
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

(2013) Reduced-complexity approx-log-MAP and max-log-MAP soft PSK/QAM detection algorithms. IEEE Transactions on Communications. (In Press)

Record type: Article

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.

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Accepted/In Press date: 2013
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 346955
URI: http://eprints.soton.ac.uk/id/eprint/346955
PURE UUID: dfba3367-044c-45b0-8c41-c65528eaf227
ORCID for Soon Xin Ng: ORCID iD orcid.org/0000-0002-0930-7194
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 21 Jan 2013 14:57
Last modified: 06 Jun 2018 13:15

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