基于空间耦合码的比特交织编码调制迭代检测系统研究

如何面向新一代无线通信应用（如物联网、大数据存储）设计逼近信道容量的编码调制方案及低复杂度的检测译码算法是信道编码领域一个极具挑战性的难题。空间耦合码继承了原模图码和卷积码的优势，拥有简单的编译码结构和优越的纠错性能，故受到了广泛关注。本项目拟在非遍历性慢衰落信道中对基于咬尾型空间耦合原模图码和高阶移相键控/正交幅度调制的比特交织编码调制迭代检测系统展开深入研究：1）提出系统中断限分析理论，并设计满分集调制策略和高效星座图方案；2）提出分散型外信息转移理论，分析有限长空间耦合码的收敛和纠错性能；3）提出准循环复合咬尾型空间耦合原模图码构造算法和不等保护比特交织方案，触发波状收敛并获得逼近中断限的有限长性能；4）提出新颖的虚拟截断边界构建方法和改进型滑动窗口译码算法，提升译码速度和性能。相关成果可丰富空间耦合原模图编码调制理论体系，并为新一代无线通信应用提供一种更高频谱效率的物理层传输技术。

How to design capacity-approaching coded modulation schemes and their corresponding low-complexity detection/decoding algorithms for the next-generation wireless-communication applications (e.g., internet of things (IoT), big-data storage) is an extremely challenging issue in channel-coding community. Spatially coupled protograph (SC-P) codes, which inherit the advantages of both protograph low-density parity-check (LDPC) codes and convolutional codes, possess not only simple encoding and decoding structures but also excellent error performance, and therefore have attracted a significant amount of research attention in recent years. This project plans to carry out an in-depth investigation on the tail-biting (TB) SC-P-code-based bit-interleaved coded modulation (BICM) systems with high-order phase-shift keying/quadrature amplitude modulation (PSK/QAM) and iterative detection (ID) over non-ergodic slow-fading channels. Specifically, 1）we put forward an outage-limit analysis theory, a full-diversity modulation strategy, as well as a high-efficiency constellation design scheme for the TB-SC-P-code-based BICM-ID systems；2）we propose a scattered extrinsic information transfer (S-EXIT) theory to analyze the convergence and error performance of finite-length TB-SC-P codes；3）we conceive a new construction algorithm to formulate a type of quasi-cyclic (QC) composite TB-SC-P codes and an unequal-protection bit interleaving scheme to trigger the wave-like convergence and accomplish outage-limit-approaching finite-length performance；4）we develop a novel virtual-termination-boundary creating method and an enhanced windowed belief-propagation (BP) decoding algorithm to boost the decoding speed and performance. The expected results not only can enrich the theory of SC-P coded modulation, but also can provide an excellent physical-layer transmission technique with higher spectral efficiency for the next-generation wireless communication applications.