LDPC/Turbo双模译码器技术发展与前景综述

The advance overview on LDPC/Turbo dual-mode decoders

Turbo码和LDPC码的性能接近Shannon理论极限,有着很强的抗衰落和抗干扰的能力,因此特别适合在卫星通信、深空通信、移动通信、无线接入等无线通信系统中运用.目前LDPC/Turbo双模译码器技术还没有形成相对成熟、完整的理论体系,对相关研究的系统性总结工作仍然相对缺乏.我们首先回顾了LDPC/Turbo双模译码器的发展现状,其次详细总结了译码器结构以及SISO的实现方法,并对其进展情况和特点分别进行总结分析.最后,就双模译码器研究中现存的问题加以分析,并探讨了其发展趋势.

Turbo code and Low-Density Parity-Check（LDPC）code can achieve excellent performance,which are close to the Shannon limit.They have strong ability of anti-fading and anti-interference.Therefore,it is especially suitable for applications in satellite communication, deep space communication, mobile communication,wireless access and other wireless communication systems.Currently the technology based on the LDPC/Turbo dual-mode decoder has not formed a relatively complete and mature theoretical system.A systematic summary of the relevant research work still lacks.Firstly we reviewed the development status of the LDPC/Turbo dual-mode decoder. Then we summarized the structure of the decoder and the implementation methods of SISO in detail.Meanwhile we analyzed their progress and characteristics.Finally we analyzed the existing problems in the research of the dual-mode decoder and tried to explore its development trends.