| LDPC编码自适应加载MIMO-OFDM系统性能分析 |
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| 引用本文： | 杨万全,袁爱平. LDPC编码自适应加载MIMO-OFDM系统性能分析[J]. 电子科技大学学报(自然科学版), 2008, 37(5): 664-667 |
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| 作者姓名： | 杨万全 袁爱平 |
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| 作者单位： | 四川大学电子信息学院,成都,610064;四川大学电子信息学院,成都,610064 |
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| 摘 要： | 介绍了LDPC校验阵的构造及编译码算法,采用了随机法构造LDPC校验阵,编码基于高斯消去直接进行译码采用无穷阶量化时的置信传播算法;讨论了OFDM自适应加载技术与多输入多输出技术,结合自适应比特功率分配算法与基于多载波调制的比特分配方案实现了该加载分配技术;给出了LDPC编码的自适应加载MIMO-OFDM系统的模型。经仿真分析得出,二元域上非规则LDPC编码的系统性能优于多元域上的,自适应加载MIMO-OFDM技术大大提高了系统传输速率,有效增强了系统抗衰落性。
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| 关 键 词： | 自适应加载 低密度校验码 多输入多输出 正交频分复用 |
| 收稿时间： | 2007-03-13 |
Performance Analysis of MIMO-OFDM Systems with Adaptive-Loading Based on LDPC Codes |
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| YANG Wan-quan,YUAN Ai-ping. Performance Analysis of MIMO-OFDM Systems with Adaptive-Loading Based on LDPC Codes[J]. Journal of University of Electronic Science and Technology of China, 2008, 37(5): 664-667 |
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| Authors: | YANG Wan-quan YUAN Ai-ping |
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| Affiliation: | 1.College of Electronics and Information,Sichuan University Chengdu 610064 |
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| Abstract: | The construction of the check matrix and the coding and decoding algorithms of low density parity check (LDPC) are introduced. The adaptive loading technique of orthogonal frequency division multiplexing (OFDM) and multiple-input multiple-output (MIMO) are discussed. The model of the LDPC coded MIMO-OFDM system with adaptive-loading is given. The performance of the system under multiple-path rayleigh fading channels is simulated and analyzed. It is obtained that the performance of irregular LDPC coded system based on GF(2)is better than that based on GF(q,q<>2), The presented MIMO-OFDM system can greatly enhance the transfer rate and has an excellent anti-fading feature under multiple-path fading channels. |
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