| 基于Turbo乘积码的Turbo均衡系统 |
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| 引用本文： | 沈旭栋,赵熠飞,赵明,许希斌,罗晨.基于Turbo乘积码的Turbo均衡系统[J].清华大学学报(自然科学版),2010(4). |
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| 作者姓名： | 沈旭栋 赵熠飞 赵明 许希斌 罗晨 |
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| 作者单位： | 清华大学清华信息科学与技术国家实验室;总参陆航驻北京地区军代室; |
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| 基金项目： | 国家“八六三”高技术项目(2007AA01Z2B6); 国家“九七三”重点基础研究项目(2007CB310608); 新一代宽带无线移动通信网科技重大专项(2008ZX03003-004) |
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| 摘 要： | 针对Turbo乘积码在严重跨符号干扰(ISI)信道下采用独立均衡器存在较大的性能损失,该文提出了基于Turbo乘积码的Turbo均衡系统。将译码器输出的软信息反馈到均衡器,在线性最小方差均衡算法中考虑先验信息,通过多次均衡和译码迭代得到性能改进。通过外信息转移图分析可知,Turbo均衡可以显著改善Turbo乘积码在ISI信道下的性能。针对仿真的两种信道分别可以获得1dB和2.5dB的性能提高。另外,通过合理分配均衡迭代和译码迭代可以获得更低的系统复杂度。
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| 关 键 词： | Turbo均衡 LMMSE Turbo乘积码 EXIT图分析 |
Turbo equalization system combined with turbo product codes |
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| SHENXudong,ZHAOYifei,ZHAOMing,XUXibin,LUOChen.Turbo equalization system combined with turbo product codes[J].Journal of Tsinghua University(Science and Technology),2010(4). |
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| Authors: | SHENXudong ZHAOYifei ZHAOMing XUXibin LUOChen |
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| Institution: | SHEN+Xudong1,ZHAO+Yifei1,ZHAO+Ming1,XU+Xibin1,LUO+Chen2(1.+Tsinghua+National+Laboratory+for+Information+Science+,+Technology,Tsinghua+University,Beijing+100084,China,2.+Army+in+the+General+Staff+Military+Representative+Office+in+Beijing,Beijing+100176,China) |
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| Abstract: | Turbo product codes (TPC) have great performance losses over inter-symbol interference (ISI) channels. This paper presents a turbo equalization system combined with TPC to take advantage of the iterative equalization and decoding. The performance under different ISI channels indicates that 1 dB and 2.5 dB gains can be achieved by turbo equalization with LMMSE method. Possibility exists to tradeoff the iterative times between equalization and decoding to minimize the system complexity. EXIT chart analysis ve... |
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| Keywords: | turbo equalization linear-MMSE turbo product code EXIT chart analysis |
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