Cooperative relay channel with LDPC codes constructed from array codes

2009 Wireless Telecommunications Symposium Pub Date : 2009-04-22 DOI:10.1109/WTS.2009.5068956

Mingkwan Somphruek, R. Carrasco, S. L. Goff

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Abstract

Cooperative communication represents a new class of diversity techniques in which multiple nodes each with a single antenna cooperate to generate a virtual multiple-antenna transmission system and thus offer the benefits of spatial diversity. This paper proposes suitable array codes used as low-density parity-check (LDPC) codes to be applied in the cooperative amplify-and-forward (AF) network. A mathematical description of the construction of suitable array codes for a relay fading channel is also presented. Compared with quasi-cyclic (QC) LDPC codes, the array codes have similar encoding complexity and can adaptively generate various desired girth values. This paper shows that array codes with large girths can achieve substantial system performance improvements. Simulation results in this paper show that using array codes as LDPC codes for cooperative relay transmission provides a significant performance improvement over direct transmission. Moreover, it is also shown that its performance is superior to some structured LDPC codes such as QC-LDPC codes, particularly, a coding gain of about 1dB at BER of 10−3 can be provided over its counterpart.

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由阵列码构造的LDPC码的协同中继信道

协作通信是一种新型的分集技术，它利用单个天线的多个节点相互协作，形成虚拟多天线传输系统，从而提供空间分集的优势。本文提出了合适的阵列码作为低密度校验码，应用于协同放大转发(AF)网络。本文还对中继衰落信道中合适的阵列码的构造进行了数学描述。与准循环LDPC码相比，阵列码具有相似的编码复杂度，并能自适应生成各种期望的周长值。本文表明，大周长的阵列码可以显著提高系统性能。仿真结果表明，采用阵列码作为LDPC码进行中继协同传输比直接传输性能有显著提高。此外，还表明其性能优于一些结构化LDPC码，如QC-LDPC码，特别是在10−3的误码率下，可以提供比其对应码约1dB的编码增益。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2009 Wireless Telecommunications Symposium

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