M分布星地激光通信链路相干正交频分复用系统误码性能研究  

Research on the system error performance of coherent orthogonal frequency division multiplexing system with M-distribution in satellite-to-ground laser communication

作　　者：王怡 王亚萍 WANG Yi;WANG Yaping(Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province,College of Information Engineering,China JiLiang University,Hangzhou 310018,China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]中国计量大学信息工程学院,浙江省电磁波信息技术与计量检测重点实验室,浙江杭州310018 [2]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059

出　　处：《通信学报》2020年第10期179-187,共9页Journal on Communications

基　　金：成都理工大学地质灾害防治与地质环境保护国家重点实验室开发基金资助项目(No.SKLGP2020K017);国家自然科学基金资助项目(No.51704267)。

摘　　要：为了缓解大气湍流对星地激光通信系统性能的影响,基于M分布大气信道模型,在星地激光通信上行链路和下行链路中提出了一种多载波相干正交频分复用(OFDM)调制系统,推导了星地激光通信上行链路和下行链路相干OFDM调制系统误码率的闭合表达式。在弱大气湍流和强大气湍流下,分别研究了天顶角、接收孔径、信噪比、最佳束散角以及最佳发射半径与系统误码率的关系,并与二进制相干差分相移键控(DPSK)调制进行比较。理论和仿真对比结果表明,星地激光通信系统中采用相干OFDM调制系统的误码性能优于相干DPSK调制系统。In order to alleviate the influence of atmospheric turbulence on the performance of satellite-to-ground laser communication system,based on the M-distribution atmospheric channel model,a multi-carrier coherent orthogonal frequency division multiplexing(OFDM)modulation system was proposed for uplink and downlink in the satellite-to-ground laser communication.The closed-form expression of bit error rate(BER)of coherent OFDM modulation system was derived.The relationship between the zenith angle,receiving aperture,signal-to-noise ratio(SNR),optimal beam divergence angle,and optimal transmission radius and the BER were studied under weak,and strong atmosphere turbulence,and compared with binary coherent differential phase shift keying(DPSK)modulation.Both the theory and the simulation results show that compared with coherent DPSK modulation,the bit error performance of the coherent OFDM modulation system in the satellite-to-ground laser communication system is better.

关 键 词：星地激光通信 M分布 正交频分复用 光强闪烁 光束漂移 到达角起伏 

分 类 号：TN929.13[电子电信—通信与信息系统]