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 L og- 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
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
出处
《广西科学》
CAS
2003年第2期94-96,106,共4页
Guangxi Sciences
基金
广西自然科学基金资助项目(桂科自 9912 0 0 5)
广西教育厅科研项目(桂教科研 [2 0 0 0 ] 3 92号 )
广西高校百名中青年学科带头人资助计划项目 (桂教人[2 0 0 2 ] 467号 )
