| 2种简化的LDPC译码算法在OFDM系统应用中的改进 |
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| 引用本文： | 屈兰,张德民,谢显中. 2种简化的LDPC译码算法在OFDM系统应用中的改进[J]. 重庆邮电学院学报(自然科学版), 2007, 0(2) |
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| 作者姓名： | 屈兰 张德民 谢显中 |
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| 作者单位： | 重庆邮电大学重庆移动通信重点实验室 重庆400065 |
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| 摘 要： | 在未来的3G+高速无线通信中,最广泛运用的物理层技术OFDM必然采用频谱利用率较高的多电平调制,因此,如何把LDPC码用于多电平调制下的OFDM是一个关键。对目前较为简化的基于二进制调制的概率似然比LDPC译码算法和对数似然比LDPC译码算法进行了改进,使之能够应用到基于多进制调制的OFDM系统中。仿真结果验证了改进后的算法是有效的,并且使LDPC码在OFDM系统中的应用较Turbo码有更好的性能。
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| 关 键 词： | LDPC OFDM 概率似然比 对数似然比 |
Improvements of two LDPC decoding algorithms as applying in the OFDM system |
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| QU Lan ZHANG de-min XIE xian-zhong. Improvements of two LDPC decoding algorithms as applying in the OFDM system[J]. Journal of Chongqing University of Posts and Telecommunications(Natural Sciences Edition), 2007, 0(2) |
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| Authors: | QU Lan ZHANG de-min XIE xian-zhong |
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| Abstract: | In future 3G+mobile communications,the extensively adopted technique OFDM is required to adopt mul- tilevel modulation.Hence,How to combine the channel coding LDPC with the multi-modulation OFDM is our pri- mary work.In this paper,we improve the simplified probability-likelihood and Log-likelihood LDPC decoding algo- rithms based on binary modulation,which enables them to apply in multilevel modulation based OFDM system.The simulation result demonstrates the validity of these two improved algorithms,and compared with Turbo codes,the improved algorithms perform better when LOPC applies in OFDM system. |
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| Keywords: | LDPC OFDM probability-likelihood log-likelihood |
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