潜标系统中基于空间耦合码的高性能信道编码技术研究

With the development of ocean technologies, underwater acoustic real-time transmission is desired for new submerged buoy systems. However, compared with terrestrial wireless channels, the interference of underwater acoustic wireless channels is much more severe. Therefore, improving reliability is the most urgent task for wireless real-time submerged buoy systems. It is well known that channel coding is the key technology to guarantee reliability of communications systems. It has become mature for terrestrial communications, but still need more researches for underwater acoustic wireless communications in applications like wireless real-time submerged buoy systems. This project focuses the recent hotspot in channel coding- - spatially-coupled codes and performs researches on spatially-coupled code based high performance low power channel coding technologies in respect of code construction, decoding, adaptive channel coding, etc. The project will propose Shannon-limit approaching code construction schemes, low-error rate low complexity decoding algorithms, error rate estimation approaches and low power adaptive channel coding methods for spatially-coupled codes over the underwater acoustic wireless channel. The research fruits of this project will make up for the lack of key technologies for high reliability low power applications over the underwater acoustic wireless channel, which are important in both theory and practice for submerged buoy systems and eventually they will promote the development of our ocean technologies.

随着海洋科技的不断推进，水声实时传输在新型潜标系统中备受青睐，然而水声信道较陆地无线信道干扰更加严重，因此提高水声信道系统可靠性尤为迫切。信道编码技术是通信系统中确保可靠性的关键技术，其针对陆地通信已较为完善，但对于水声通信，尤其是适用于新型潜标系统的信道编码技术仍有待进一步研究。本项目聚焦于信道编码技术中的新热点- - 空间耦合码，从码组构造、解码性能以及自适应编码等方面入手，研究潜标系统中基于空间耦合码的高性能低功耗信道编码技术。本项目将重点研究空间耦合码在水声无线信道中逼近香农极限的构造方法、低误码率低复杂度的解码算法、误码率的准确估计以及低功耗自适应编码技术。研究成果有望弥补现有信道编码技术在水声无线信道下高可靠性与低功耗应用中的不足，对潜标系统可靠性、时效性、实用性的保证具有重要的理论意义与实用价值，对我国海洋科技的发展也将起到积极的促进作用。

本项目针对无线实时潜标系统，重点研究了潜标系统数据传输的可靠性问题。在提高信道编码译码器性能和降低译码复杂度方面，提出四种改进的译码算法，分别为组合修正加权位翻转（CM-WBF）译码算法、混合修正加权位翻转（MM-WBF）译码算法、可靠性修正加权位翻转（RA-WBF）译码算法以及Tchebyshev-Padé逼近置信传播（TPA-BP）译码算法。在空间耦合码构造方面，提出一种protograph-based 空间耦合LDPC码的构造方法和快速环检测算法。在水声通信网络架构方面，提出一种水陆无线混合组网方案和分布式拓扑控制算法。基于以上研究，已发表三大索引论文5篇，其中期刊论文3篇，国际会议论文2篇，申请发明专利1项。研究成果可以弥补潜标系统现有信道编码技术在可靠性与功耗方面的不足，对确保潜标系统可靠性、时效性、实用性具有重要的理论意义与实用价值。