RIS 辅助的LDPC 乘积码编码中继协作系统构建与性能分析  

Establishment and performance analysis of RIS-assisted codedrelay cooperation system based on LDPC product codes

作　　者：张顺外[1] 王金 ZHANG Shunwai;WANG Jin(College of Telecommunications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003

出　　处：《通信学报》2023年第11期173-182,共10页Journal on Communications

基　　金：江苏省高等学校自然科学研究基金资助项目(No.20KJB510034);宽带无线通信与传感网技术教育部重点实验室开放研究基金资助项目(No.JZNY202112)。

摘　　要：为实现极其可靠信息传输,针对融合可重构智能表面(RIS)技术与编码中继协作技术系统展开研究,建立了RIS辅助的低密度奇偶校验(LDPC)乘积码编码中继协作系统模型;利用LDPC乘积码,信源节点对信息矩阵行编码,中继节点对信息矩阵列编码;提出了一种高效联合迭代译码算法,目的节点对接收的两路信号分别进行LDPC行译码与LDPC列译码,并迭代更新信息位的对数似然比,再判决输出。理论推导了所提系统的中断概率以及有限码长信道容量的闭合解。理论分析与仿真结果表明,所提系统性能明显优于传统编码中继协作系统,而且随着RIS反射单元数量增加,优势变得更明显;随着LDPC乘积码码长增加,所提系统的有限码长信道容量逐渐逼近理想信道容量。To pursue the ultra-reliable information transmission,the system which combined the reconfigurable intelligent surface(RIS)technology and coded relay cooperation technology was investigated.The RIS-assisted coded relay cooperation system model based on low density parity check(LDPC)product codes was established.Based on LDPC product codes,the information matrix was row-encoded by the source node and column-encoded by the relay node,respectively.An efficient joint iterative decoding algorithm was proposed.The two received signals at the destination were row-decoded and column-decoded iteratively to update the logarithmic likelihood ratios of information bits,and then the decoding decision was made.The closed-form solutions of the outage probability and the channel capacity with finite codelength were theoretically derived.Theoretical analysis and simulation results show that the proposed system obviously outperforms the traditional coded relay cooperation.The more number of RIS elements,the more significant advantage can be obtained.Simulation results also demonstrate that the channel capacity with finite codelength approaches the ideal channel capacity with the codelength of LDPC product codes increasing.

关 键 词：RIS LDPC乘积码 编码中继协作 中断概率 有限码长信道容量 

分 类 号：TN911[电子电信—通信与信息系统]