自由空间光通信下SCB-Spinal码的性能分析  

Performance Analysis of SCB-Spinal Code in Free-Space Optical Communication

作　　者：张兢 李文庆 曹阳 彭小峰 杜凡丁 Zhang Jing;Li Wenqing;Cao Yang;Peng Xiaofeng;Du Fangding(School of Electrical and Electronic Engineering,Chongqing University of Technology,Chongqing 400054,China)

机构地区：[1]重庆理工大学电气与电子工程学院,重庆400054

出　　处：《激光与光电子学进展》2022年第23期232-238,共7页Laser & Optoelectronics Progress

基　　金：重庆市教委科学技术项目(KJQN201901125);重庆市教委科学技术研究青年项目(KJQN202101124);重庆市科委社会事业与民生保障科技创新专项(cstc2017shmsA40019);重庆市基础与前沿研究计划项目(cstc2019jcy-msxmX0233)。

摘　　要：针对自由空间光通信中Spinal码译码复杂度高及不等差错保护问题,提出一种分段循环冗余校验(CRC)、Spinal码与BCH码级联的SCB-Spinal码方案。通过分段的CRC校验提前终止过程,减少解码计算量,降低了译码复杂度,并在尾部级联BCH码对易错的尾部信息进行纠错保护。仿真结果表明:在不同湍流强度下,SCB-Spinal码方案都有效地降低了译码复杂度并获得了更好的误码率性能,在弱湍流强度低信噪比情况下较传统Spinal码方案降低了约62%的复杂度,速率也有0.04~0.17 bit/symbol的性能提升;在中强湍流强度影响下,较传统Spinal码方案降低了50%~60%的复杂度。在为自由空间光通信中Spinal码的高效应用提供了一种解决方案。Aiming at the problems of high decoding complexity and unequal error protection of Spinal codes in free space optical communication,a SCB-Spinal code scheme is proposed,in which cyclic redundancy code(CRC),Spinal codes,and BCH codes are concatenated.Premature termination of the segmented CRC check reduces the amounts of decoding calculations and the complexity of decoding,and also cascades the BCH code at the tail to perform error correction protection for error-prone tail information.The simulation results show that the SCB-Spinal code effectively reduces decoding complexity and obtains better bit error rate performance under different turbulence intensities.Compared to the traditional Spinal code,the SCB-Spinal code is approximately 62%lower with respect to signal-to-noise ratio and turbulence.In addition,it exhibited a performance rate of 0.04-0.17 bit/symbol.With respect to moderate and strong turbulence intensities,the complexity under SCB-Spinal code is reduced by 50%-60%,facilitating efficient application of Spinal code in free space optical communication.

关 键 词：光通信 自由空间光通信 Spinal码 译码复杂度 循环冗余码 BCH码 大气湍流 

分 类 号：TN929.12[电子电信—通信与信息系统]