| 低密度格码在OFDM系统中的应用与性能仿真 |
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| 引用本文： | 顾 伟,朱联祥. 低密度格码在OFDM系统中的应用与性能仿真[J]. 国际商务研究, 2012, 52(3) |
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| 作者姓名： | 顾 伟 朱联祥 |
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| 作者单位： | 重庆邮电大学 信号与信息处理重点实验室，重庆 400065;重庆邮电大学 信号与信息处理重点实验室，重庆 400065 |
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| 基金项目： | 信号与信息处理重庆市市级重点实验室建设项目(CSTC2009CA2003) |
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| 摘 要： | 信道编码是OFDM系统的关键技术之一，低密度格码（Low Density Lattice Codes, LDLC）则是一种能高效译码且达到AWGN信道容量的新型编码技术，它兼具格码和低密度奇偶校验码（Low Density Parity Codes, LDPC）的特点。基于LDLC码编译码原理，给出了LDLC码作为前向纠错编码技术应用于OFDM系统的方案，在MATLAB平台下仿真研究了LDLC-OFDM系统在Rayleigh衰落信道下的性能，结果表明LDLC码很大程度地改善了OFDM系统的误码率性能，且优于LDPC码。
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| 关 键 词： | 正交频分复用；信道编码；低密度格码；瑞利衰落 |
Application of low density lattice codes in OFDM system and performance simulation |
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| GU Wei and ZHU Lian-xiang. Application of low density lattice codes in OFDM system and performance simulation[J]. International Business Research, 2012, 52(3) |
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| Authors: | GU Wei and ZHU Lian-xiang |
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| Abstract: | Channel coding is one of key technologies for OFDM system.Low density lattice codes(LDLC), which combine the features of lattice codes and low density parity codes(LDPC), are recently-proposed lattice codes that can be decoded efficiently and approach the capacity of the additive white Gaussian noise(AWGN) channel. The basic principles of LDLC are described and the application of LDLC as a forward error correction coding in OFDM system with Rayleigh fading is researched. The performance of LDLC-OFDM system is studied on MATLAB. Simulation results show that the bit error rate(BER) performance of LDLC-OFDM system is significantly improved compared with OFDM system and better than that of LDPC-OFDM system. |
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| Keywords: | orthogonal frequency division multiplexing(OFDM) channel coding low density lattice code(LDLC) Rayleigh fading |
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