EXIT Chart Analysis for Turbo LDS-OFDM Receivers

Razavi, R., Imran, M. A. and Tafazolli, R. (2011) EXIT Chart Analysis for Turbo LDS-OFDM Receivers. In: 2011 7th International Wireless Communications and Mobile Computing Conference, Istanbul, Turkey, 04-08 Jul 2011, pp. 354-358. ISBN 9781424495382 (doi: 10.1109/IWCMC.2011.5982559)

Abstract

In this paper, the mutual information transfer characteristics of turbo Multiuser Detector (MUD) for a novel air interface scheme, called Low Density Signature Orthogonal Frequency Division Multiplexing (LDS-OFDM) are investigated using Extrinsic Information Transfer (EXIT) charts. LDS-OFDM uses Low Density Signature structure for spreading the data symbols in frequency domain. This technique benefits from frequency diversity besides its ability of supporting parallel data streams more than the number of subcarriers (overloaded condition). The turbo MUD couples the data symbols' detector of LDS scheme with users' FEC (Forward Error Correction) decoders through the message passing principle. The effect of overloading on LDS scheme's performance is evaluated using EXIT chart. The results show that at Eb/N0 as low as 0.3, LDS-OFDM can support loads up to 300%.

• Item Type: Conference Proceedings
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Imran, Professor Muhammad
• Authors: Razavi, R., Imran, M. A., and Tafazolli, R.
• College/School: College of Science and Engineering > School of Engineering
• ISBN: 9781424495382
• Published Online: 12 August 2011
• Copyright Holders: Copyright © 2011 IEEE
• First Published: First published in 2011 7th International Wireless Communications and Mobile Computing Conference: 354-358
• Publisher Policy: Reproduced in accordance with the publisher copyright policy