CN 11-2436/TN
ISSN 1001-5078

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基于FSO系统极化码的改进译码方案研究
Study on improved decoding method for polar codes based on FSO system
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中文关键词  大气湍流信道  极化码  BP译码  译码复杂度
英文关键词  atmospheric turbulence channel  polar code  BP decoder  decoding complexity
基金项目  国家自然科学基金项目(No.61205106);博士后科学基金项目(No.2014M552329);重庆市教委基金项目(No.KJ120827);重庆市教委科学技术项目(No.KJ1500934)资助
作者单位
张晗1,涂巧玲1,王为2,曹阳1,彭小峰1,罗运桓3 1.重庆理工大学电气与电子工程学院,重庆 400054;2.南京邮电大学通信与信息工程学院江苏 南京 2100233.中国电信股份有限公司仙桃分公司湖北 仙桃 433000 
中文摘要
      针对服从对数正态分布的大气弱湍流信道模型,选用极化码来改善FSO系统传输性能。引入一种基于3×3核心矩阵的置信传播(BP)译码方法,对核心矩阵、码字长度、以及基本单元计算式进行了改进。对比采用新型BP译码方法与传统BP译码方法的FSO系统误码率性能。仿真实验结果表明,改进型BP译码方法与传统BP译码方法相比有着更低的误码率。由于系统构造的原因,改进型BP译码占用的存储空间较少、译码延迟时间短,在码长较长的情况下,对FSO系统传输性能有较大的提升。
英文摘要
      For atmospheric weak turbulence channel model with lognormal distribution,polar code is adopted to improve the FSO system transmission performance.A new BP decoder based on a modified 3×3 kernel matrix is proposed.The kernel matrix,code-rate and the calculation formula for the basic unit were redefined.BER performance of the polar codes with the new BP decoder and the traditional BP decoder was compared and analyzed.The numerical results show that the proposed method has a lower bit error rate compared with the traditional BP decoder.More importantly,the message memory requirement can be reduced and the time delay can be reduced.Under the longer code-word length,the performance of FSO system is much improved.

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