NDLI: Efficient channel estimation for chip multiuser detection on underwater acoustic channels

Content Provider	IEEE Xplore Digital Library
Author	Aliesawi, S. Tsimenidis, C.C. Sharif, B.S. Johnston, M.
Copyright Year	2010
Description	Author affiliation: School of Electrical, Electronics and Computer Engineering, Newcastle University, Newcastle Upon Tyne, UK (Aliesawi, S.; Tsimenidis, C.C.; Sharif, B.S.; Johnston, M.)
Abstract	Two different single-element synchronous downlink multiple access schemes, interleave division multiple access (IDMA) and code division multiple access (CDMA) in conjunction with channel estimation, are considered for underwater communications channels. The proposed hard/soft chip channel estimation and carrier phase tracking are jointly optimized based on the mean square error (MSE) criterion and adopted iteratively by the reconstructed multiple access interference (MAI) signal, which is generated using exchanged soft information in terms of log-likelihood ratio (LLR) estimates with the single-users' channel decoders. The performance of the proposed receiver structures are investigated and compared in short range shallow water acoustic channels. Results for synchronous multiuser scenarios with 2 users, using quadrature phase-shift keying (QPSK) at an effective rate of 439.5 b/s per user, demonstrate significant performance improvement in both systems, and the IDMA performance outperforms long-code CDMA and short-code CDMA in most configurations.
Starting Page	173
Ending Page	177
File Size	767584
Page Count	5
File Format	PDF
ISBN	9781424488582
e-ISBN	9781861353696
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-07-21
Publisher Place	United Kingdom
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Training Multiuser detection Phase shift keying Channel estimation Receivers Detectors Channel Estimation CDMA Multiaccess communication multiuser detection IDMA underwater acoustic communication
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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Performance comparison of IDMA receivers for underwater acoustic channels

Continuous pilot based adaptive estimation for IDMA systems on underwater acoustic channels

Block phase-precoding for blind multiuser detection of BPSK/DS-CDMA signals

Block phase precoding for blind multiuser detection in QPSK/DS-CDMA systems

Computationally efficient blind multiuser detection for multipath CDMA channels

Block phase-precoding for blind multiuser detection of BPSK/DS-CDMA signals

Two-stage multiuser detection for asynchronous CDMA using DPSK signalling

Multiuser robust CDMA detection for underwater acoustic communication channels

Improved performance of pilot-assisted DS-CDMA receivers through partial interference cancellation

Efficient channel estimation for chip multiuser detection on underwater acoustic channels

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