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Joint Channel Estimation and Multiuser Detection for SDMA/OFDM Based on Dual Repeated Weighted Boosting Search

Joint Channel Estimation and Multiuser Detection for SDMA/OFDM Based on Dual Repeated Weighted Boosting Search
Joint Channel Estimation and Multiuser Detection for SDMA/OFDM Based on Dual Repeated Weighted Boosting Search
A joint channel estimation and multiuser detection (JCEMUD) scheme is proposed for multiuser multiple-input–multiple-output (MIMO) space-division multiple-access/ orthogonal frequency-division-multiplexing (SDMA/OFDM) systems. We design a dual repeated weighted boosting search (DRWBS) scheme for JCEMUD, which is capable of providing "soft" outputs, which are directly fed to the forward error correction (FEC) decoder. The proposed DRWBS-JCEMUD scheme iteratively estimates the channel impulse responses and detects the users’ transmitted signals while exploiting the error correction capability of an FEC decoder to iteratively exchange information between the detector and the estimator. Furthermore, the proposed DRWBS-JCEMUD scheme is capable of providing the loglikelihood ratios of the coded bits at low computational complexity (comparable with the single-user scenario), which can directly be fed to the FEC decoder. The simulation results demonstrate that the proposed DRWBS-JCEMUD scheme is capable of attaining a mean square error performance close to that of the ideal scenario of the least-square channel estimator associated with 100% pilot overhead and narrows the discrepancy with respect to the optimal maximum-likelihood (ML) MUD associated with perfect channel knowledge. As an example, at Eb/N0 = 10 dB, a factor of 0.756 complexity reduction was achieved at the cost of a 1-dB performance penalty, in comparison with the ML-MUD.
0018-9545
3265-3275
Zhang, Jiankang
6add829f-d955-40ca-8214-27a039defc8a
Chen, Sheng
9310a111-f79a-48b8-98c7-383ca93cbb80
Mu, Xiaomin
22ae839c-4cc4-442b-bead-84abcd04880e
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Zhang, Jiankang
6add829f-d955-40ca-8214-27a039defc8a
Chen, Sheng
9310a111-f79a-48b8-98c7-383ca93cbb80
Mu, Xiaomin
22ae839c-4cc4-442b-bead-84abcd04880e
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

Zhang, Jiankang, Chen, Sheng, Mu, Xiaomin and Hanzo, Lajos (2011) Joint Channel Estimation and Multiuser Detection for SDMA/OFDM Based on Dual Repeated Weighted Boosting Search. IEEE Transactions on Vehicular Technology, 60 (7), 3265-3275.

Record type: Article

Abstract

A joint channel estimation and multiuser detection (JCEMUD) scheme is proposed for multiuser multiple-input–multiple-output (MIMO) space-division multiple-access/ orthogonal frequency-division-multiplexing (SDMA/OFDM) systems. We design a dual repeated weighted boosting search (DRWBS) scheme for JCEMUD, which is capable of providing "soft" outputs, which are directly fed to the forward error correction (FEC) decoder. The proposed DRWBS-JCEMUD scheme iteratively estimates the channel impulse responses and detects the users’ transmitted signals while exploiting the error correction capability of an FEC decoder to iteratively exchange information between the detector and the estimator. Furthermore, the proposed DRWBS-JCEMUD scheme is capable of providing the loglikelihood ratios of the coded bits at low computational complexity (comparable with the single-user scenario), which can directly be fed to the FEC decoder. The simulation results demonstrate that the proposed DRWBS-JCEMUD scheme is capable of attaining a mean square error performance close to that of the ideal scenario of the least-square channel estimator associated with 100% pilot overhead and narrows the discrepancy with respect to the optimal maximum-likelihood (ML) MUD associated with perfect channel knowledge. As an example, at Eb/N0 = 10 dB, a factor of 0.756 complexity reduction was achieved at the cost of a 1-dB performance penalty, in comparison with the ML-MUD.

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Published date: September 2011
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 272773
URI: http://eprints.soton.ac.uk/id/eprint/272773
ISSN: 0018-9545
PURE UUID: fce21c93-468d-406d-8bb3-64e1a71da1ae
ORCID for Jiankang Zhang: ORCID iD orcid.org/0000-0001-5316-1711
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 14 Sep 2011 09:06
Last modified: 18 Feb 2021 17:13

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Contributors

Author: Jiankang Zhang ORCID iD
Author: Sheng Chen
Author: Xiaomin Mu
Author: Lajos Hanzo ORCID iD

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