On Receiver Design for Uplink Low Density Signature OFDM (LDS-OFDM)

被引:82
作者
Razavi, Razieh [1 ]
AL-Imari, Mohammed [1 ]
Imran, Muhammad Ali [1 ]
Hoshyar, Reza
Chen, Dageng [2 ]
机构
[1] Univ Surrey, Ctr Commun Syst Res, Guildford GU2 7XH, Surrey, England
[2] Huawei Technol Co Ltd, Shanghai 201206, Peoples R China
关键词
Multi access communication; Iterative methods; Code division multi access; Multi-user channels; SYNCHRONOUS CDMA SYSTEMS; INTERFERENCE; MULTIPATH; OPTIMUM; CHANNEL; CODES;
D O I
10.1109/TCOMM.2012.082812.110284
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
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.
引用
收藏
页码:3499 / 3508
页数:10
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