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Design of joint sparse graph for OFDM (JSG-OFDM) system

Wen, L, Razavi, R, Imran, M and Xiao, P (2014) Design of joint sparse graph for OFDM (JSG-OFDM) system IEEE Transactions on Wireless Communications.

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Abstract

Low density signature orthogonal frequency division multiplexing (LDS-OFDM) and low density parity-check (LDPC) codes are multiple access and forward error correction (FEC) techniques, respectively. Both of them can be expressed by a bipartite graph. In this paper, we construct a joint sparse graph combining the single graphs of LDS-OFDM and LDPC codes, namely joint sparse graph for OFDM (JSG-OFDM). Based on the graph model, a low complexity approach for joint multiuser detection and FEC decoding (JMUDD) is presented. The iterative structure of JSG-OFDM receiver is illustrated, and its extrinsic information transfer (EXIT) chart is researched. Furthermore, design guidelines for the joint sparse graph are derived through the EXIT chart analysis. By offline optimization of the joint sparse graph, numerical results show that the JSG-OFDM brings about 1.5 – 1.8 dB performance improvement at bit error rate (BER) of 10 5 over similar well-known systems such as grouporthogonal multi-carrier code division multiple access (GO-MCCDMA), LDS-OFDM and turbo structured LDS-OFDM.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering > Centre for Communication Systems Research
Authors :
AuthorsEmailORCID
Wen, LUNSPECIFIEDUNSPECIFIED
Razavi, RUNSPECIFIEDUNSPECIFIED
Imran, MUNSPECIFIEDUNSPECIFIED
Xiao, PUNSPECIFIEDUNSPECIFIED
Date : 21 November 2014
Identification Number : 10.1109/TWC.2014.2373379
Additional Information : © 2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Depositing User : Symplectic Elements
Date Deposited : 24 Mar 2015 18:17
Last Modified : 25 Mar 2015 02:33
URI: http://epubs.surrey.ac.uk/id/eprint/806660

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