空间光通信中系统Raptor码的优化迭代译码算法  

Enhanced iterative decoding algorithm of systematic Raptor code for space optical communication

作　　者：任发韬 曹阳 彭小峰 陈果 李小红 REN Fatao;CAO Yang;PENG Xiaofeng;CHEN Guo;LI Xiaohong(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：《光通信技术》2019年第1期10-14,共5页Optical Communication Technology

基　　金：重庆市教委基金(KJ120827)资助;重庆市教委科学技术研究项目(KJ1500934)资助;重庆市教委科学技术研究项目(KJ1709205)资助;重庆市科委社会事业与民生保障科技创新专项(cstc2017shms A40019)资助

摘　　要：为降低自由空间光通信(FSO)中系统Raptor码的译码延时和误码率,提出一种优化的迭代译码算法(EIDA)。通过重新构造系统Raptor码的Tanner图,将LDPC码与LT码进行组合迭代译码以提高译码速度和可靠性;建立Gamma-Gamma信道模型,分别对优化算法和传统算法进行仿真。仿真结果表明:优化算法在相同条件下能够改善FSO系统的译码延时和误码率。In order to reduce the decoding delay and bit error rate of Raptor codes in free space optical communication(FSO), this paper proposes an enhanced iterative decoding algorithm(EIDA). By reconstructing Tanner diagram of system Raptor code, the paper combines the LDPC code and LT code to decode iteratively to improve the decoding speed and reliability. The Gamma-Gamma channel model is established, and the enhanced algorithm and the traditional algorithm are simulated respectively. The simulation results show that the enhanced algorithm can improve the decoding delay and bit error rate of FSO under the same conditions.

关 键 词：自由空间光通信 系统Raptor码 译码算法 误码率 译码时间 

分 类 号：TN929.1[电子电信—通信与信息系统]