Turbo均衡系统中基于相关的自适应信道编码  

Correlation-based adaptive channel coding in Turbo equalization systems

作　　者：徐立洲[1] 张力[1] 姜建[1] 王营冠[1] 

机构地区：[1]中国科学院上海微系统与信息技术研究所无线传感网与通信重点实验室,上海200050

出　　处：《华中科技大学学报（自然科学版）》2013年第4期41-45,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家科技重大专项基金资助项目(2010ZX03006-002);中国科学院知识创新工程重要方向资助项目;上海市科委攻关项目(10511002500)

摘　　要：研究了频率选择性信道Turbo均衡系统自适应信道编码问题.首先在单输入单输出的Turbo均衡系统中分析均衡器与译码器之间转移的软信息,进而得到软信息与原始数据信息的统计相关随接收迭代次数的增加而趋向收敛的结论.利用相关特性收敛给出了均衡器与译码器的行为描述,并建立自适应选择发射信道编码码率的准则,提出自适应编码算法使系统误比特性能保持在一定水平之下.仿真结果表明:提出的自适应信道编码算法显著提高了系统的整体吞吐量性能,整个系统吞吐量增加并趋于优化,其性能优于任何固定码率配置系统的性能.To analyze adaptive channel coding scheme in Turbo equalization systems over frequency se- lective channel, firstly, soft information exchanging between the equalizer and the decoder at the re- ceiver was presented from a single input single output （SISO） Turbo system. It is seen that the corre- lation between the true transmit signal and its soft-information based estimate will converge along with increasing the number of iteration. The correlation of the equalizer with the decoder was also de- scribed from the correlation convergence. A criterion for adaptively selecting the transmit coding rate was established. Then an adaptive coding algorithm to keep the system bit error rate （BER） below a threshold was proposed. Simulation result demonstrates that the system＇s throughput of the method is significantly improved and is optimized when compared with any other fix-rate coded systems.

关 键 词：TURBO均衡 自适应 信道编码 码率准则 均衡系统 

分 类 号：TN911.23[电子电信—通信与信息系统]