极低码率Turbo码及其应用研究

针对极低信噪比条件下的传输,研究了极低码率Turbo码的编译码器结构,仿真分析了其性能。提出了极低码率Turbo码在高带宽容量、复杂信道环境,例如：短波通信、流星余迹通信等系统中的使用方法。比较了极低码率Turbo码与高码率Turbo码加扩频的性能。研究表明,极低码率Turbo码较传统高码率Turbo码有更好的性能,能将自适应调制编码技术向低信噪比环境扩展。

Research on Low Rate Turbo Code and Its Applications

For the purpose of transmission with very low signal to noise ratios,the structure of the encoder of a low rate turbo code is presented in this paper. The corresponding decoding algorithm is analyzed,and the performance of this coding scheme is obtained by simulations. This paper presents the application method of low rate Turbo code in shortwave communications or meteor burst communications systems is proposed in high bandwidth and complex channel environment. Comparisons are conducted between the application of low rate turbo code and the concatenating scheme of high rate turbo code and spectrum spread technique. The study proves that low rate Turbo code has better performance than traditional ones. With low rate turbo code,the application of adaptive modulation and coding technique can be extended to low signal to noise scenarios.