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EXIT Chart Analysis for Turbo LDS-OFDM Receivers

Razavi, R, Imran, MA and Tafazolli, R (2011) EXIT Chart Analysis for Turbo LDS-OFDM Receivers In: 7th International Wireless Communications and Mobile Computing Conference (IWCMC), 2011-07-04 - 2011-07-08, Istanbul.

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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 or Workshop Item (Paper)
Additional Information:

Copyright 2011 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

Divisions: Faculty of Engineering and Physical Sciences > Electronic Engineering > Centre for Communication Systems Research
Depositing User: Symplectic Elements
Date Deposited: 30 Nov 2012 09:48
Last Modified: 23 Sep 2013 19:40
URI: http://epubs.surrey.ac.uk/id/eprint/726035

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