On receiver design for low density signature OFDM (LDS-OFDM)

Razavi, R., Al-Imari, M., Imran, M. A. , Hoshyar, R. and Chen, D. (2012) On receiver design for low density signature OFDM (LDS-OFDM). IEEE Transactions on Communications, 60(11), pp. 3499-3508. (doi:10.1109/TCOMM.2012.082812.110284)

136370.pdf - Accepted Version



Low density signature orthogonal frequency division multiplexing (LDS-OFDM) is an uplink multi-carrier multiple access scheme that uses low density signatures (LDS) for spreading the symbols in the frequency domain. In this paper, we introduce an effective receiver for the LDS-OFDM scheme. We propose a framework to analyze and design this iterative receiver using extrinsic information transfer (EXIT) charts. Furthermore, a turbo multi-user detector/decoder (MUDD) is proposed for the LDS-OFDM receiver. We show how the turbo MUDD is tuned using EXIT charts analysis. By tuning the turbo-style processing, the turbo MUDD can approach the performance of optimum MUDD with a smaller number of inner iterations. Using the suggested design guidelines in this paper, we show that the proposed structure brings about 2.3 dB performance improvement at a bit error rate (BER) equal to 10-5 over conventional LDS-OFDM while keeping the complexity affordable. Simulations for different scenarios also show that the LDS-OFDM outperforms similar well-known multiple access techniques such as multi-carrier code division multiple access (MC-CDMA) and group-orthogonal MC-CDMA.

Item Type:Articles
Additional Information:This work was supported by Huawei Technologies Co., Ltd, China.
Glasgow Author(s) Enlighten ID:Imran, Professor Muhammad
Authors: Razavi, R., Al-Imari, M., Imran, M. A., Hoshyar, R., and Chen, D.
College/School:College of Science and Engineering > School of Engineering
Journal Name:IEEE Transactions on Communications
ISSN (Online):1558-0857
Published Online:04 September 2012
Copyright Holders:Copyright © 2012 IEEE
First Published:First published in IEEE Transactions on Communications 60(11): 3499-3508
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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