[1]刘斌彬,白 栋,葛启宏,等.QC-LDPC编码OFDM系统的码优化及迭代译码[J].南京理工大学学报(自然科学版),2009,(03):352-356.
 LIU Bin-bin,BAI Dong,GE Qi-hong,et al.Code Optimization and Iterative Decoding of QC-LDPC Coded OFDM System[J].Journal of Nanjing University of Science and Technology,2009,(03):352-356.
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QC-LDPC编码OFDM系统的码优化及迭代译码
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《南京理工大学学报》(自然科学版)[ISSN:1005-9830/CN:32-1397/N]

卷:
期数:
2009年03期
页码:
352-356
栏目:
出版日期:
2009-06-30

文章信息/Info

Title:
Code Optimization and Iterative Decoding of QC-LDPC Coded OFDM System
作者:
刘斌彬1 白 栋2 葛启宏1 梅顺良1
1. 清华大学电子工程系, 北京100084; 2. 北京大学电子学系, 北京100871
Author(s):
LIU Bin-bin1BAI Dong2GE Qi-hong1MEI Shun-liang1
1.Department of Electronic Engineering,Tsinghua University,Beijing 100084,China;2.Department of Electronics,Peking University,Beijing 100871,China
关键词:
正交频分复用 信道编码 电信管道 低密度奇偶校验码 码优化 迭代译码 度分布 高斯近似
Keywords:
orthogonal frequency division multiplexing channel coding telecommunication channels low density parity check codes code optimization iterative decoding degree distribution Gaussian approximation
分类号:
TN919.3
摘要:
为解决在多径环境下,部分正交频分复用(OFDM)子载波可能遭受深衰落而导致系统性能严重下降的问题,该文提出了一种准循环低密度奇偶校验(QC-LDPC)编码的OFDM系统。在该系统中,编码后的校验比特被映射到更高阶的星座图中,并在迭代译码中采用Group Shuf-fled消息传递调度。根据码字比特映射方式的不同,利用基于Group Shuffled置信传播的密度演进的高斯近似对QC-LDPC码进行了优化。加性高斯白噪声和Rayleigh衰落信道下的仿真结果表明,该系统具有更好的纠错性能和更快的译码收敛速度
Abstract:
In the multi-paths environment,since the performance of orthogonal frequency division multiplexing(OFDM) system may be severely degraded by the sub-carriers in deep fading,powerful error-correcting codes have to be applied to OFDM.This paper presents a novel quasi-cyclic low density parity check(QC-LDPC) coded OFDM system.In this system,the redundant bits of codeword are mapped to higher-order constellation,and a group shuffled message passing scheduling is used in the iterative decoding.According to the mapping scheme,the QC-LDPC code is optimized by density evolution based on group shuffled message passing with Gaussian approximation.Simulation results show that the proposed system can achieve better error rate performance and faster decoding convergence than conventional approaches on both additive white Gaussian noise(AWGN) and Rayleigh fading channels.

参考文献/References:

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相似文献/References:

[1]梁彦,束锋,史夏洁,等.正交频分复用系统发射机接收机同相/正交不平衡补偿算法[J].南京理工大学学报(自然科学版),2012,36(03):465.
 LIANG Yan,SHU Feng,SHI Xia-jie.Tx/Rx IQ Imbalance Compensation Scheme for OFDM Systems[J].Journal of Nanjing University of Science and Technology,2012,36(03):465.

备注/Memo

备注/Memo:
基金项目: 国家航天支撑技术基金( J04-2005040)
作者简介: 刘斌彬( 1981- ) , 男, 博士生, 主要研究方向: LDPC码的构造及其译码算法, E-mail:lbb03@ mail. tsinghua. edu. cn;
通讯作者: 梅顺良( 1946- ), 男, 教授, 博士生导师, 主要研究方向: 数字通信, 无线宽带接入, E-m ail:meisl@mail.tsinghua. edu. cn。
更新日期/Last Update: 2012-11-19