| 引用本文： |
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覃团发,黄旭方,陈跃波.基于AWGN信道下Turbo码的性能仿真及分析[J].广西科学,2003,10(2):94-96,106. [点击复制]
- Qin Tuanfa,Huang Xufang,Chen Yuebo.Performance Analysis of Turbo Codes Over AWGN Channels[J].Guangxi Sciences,2003,10(2):94-96,106. [点击复制]
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| 摘要: |
| 给出Turbo码在AWGN信道下的仿真系统结构。仿真系统的Turbo编码器由2个相同的分量编码器通过交织器并行级联而成,编、译码器中所用的交织器为随机交织器,SISO译码算法采用Log-MAP算法.通过计算机仿真,对RSC结构、交织器长度、凿孔和循环迭代次数等主要因素进行分析。结果表明:由于Turbo码很好利用迭代译码方法以及香农信道编码定理中的随机性编码译码条件,在AWGN信道的低信噪比条件下Turbo码能发挥良好性能。 |
| 关键词: Turbo码 AWGN信道 Log-MAP算法 |
| DOI： |
| 投稿时间：2002-08-29修订日期：2003-01-14 |
| 基金项目:广西自然科学基金资助项目(桂科自9912005)、广西教育厅科研项目(桂教科研[2000]392号)和广西高校百名中青年学科带头人资助计划项目(桂教人[2002]467号)。 |
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| Performance Analysis of Turbo Codes Over AWGN Channels |
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Qin Tuanfa, Huang Xufang, Chen Yuebo
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| (College of Comp and Info Engi., Guangxi Univ, 100 Daxuelu, Nanning, Guangxi, 530004, China) |
| Abstract: |
| The simulation block diagram of turbo codes over the AWGN channels is given. The encoder of a turbo code consists of two identical systematic component encoders are joined together by means of an interleaver,the interleaver of the coder is pesudo-random interleaver, the SISO (soft-input soft-output) algorithm is Log-MAP(maximum a posteriori) algorithm Recursive systematic convolutional (RSC) structure,interleaver sizes,puncturing and the number of iterations are investigated by the computer simulation. The simulation results show that turbo codes have good performance in low SNR over AWGN channels because iterative decoding and random code of Shannon's channel coding theorem are used very well for turbo codes. |
| Key words: Turbo codes AWGN channel Log-MAP algorithm |
