摘要
研究了大气湍流信道下无人机“空-地”斜程激光通信的下行链路单输入多输出(single input multiple output, SIMO)和上行链路多输入单输出(multiple input single output, MISO)技术。基于双伽马(Gamma-Gamma)分布的大气湍流模型,利用Meijer函数推导了大气湍流和指向误差联合影响下的SIMO下行链路误码率闭合表达式;利用α-μ分布建立了Gamma-Gamma湍流模型的MISO上行链路误码率性能近似表达式。系统研究了天线数、天顶角和指向误差对系统的影响,研究结果表明,空间分集技术可以有效改善系统的误码率性能,当束散角为500μrad、下行链路接收器和上行链路发射器为3时就可以得到超过10 dB的性能优化;天顶角对“空-地”斜程激光通信误码率性能影响显著,要达到系统误码率10-6的性能要求,天顶角需控制在30°左右的较小范围内。
The downlink single input multiple output(SIMO) and uplink multiple input single output(MISO)technologies of laser communication of unmanned aerial vehicle(UAV) air-ground slant in atmospheric turbulence channel were studied. Based on the atmospheric turbulence model of Gamma-Gamma distribution,the Meijer function was used to derive the bit error rate(BER) closed expression of SIMO technology in downlink under the combined influence of atmospheric turbulence and pointing error. An approximate expression of BER performance of MISO technology in uplink of Gamma-Gamma turbulence model was established based on α-μsystem were studied systematically. The results show that the spatial diversity technology can effectively improve the BER performance of the system. When the beam divergence angle is 500 μrad, and the downlink receiver as well as the uplink transmitter are 3, the performance optimization can be over 10 dB. The zenith angle has a significant influence on the BER performance of air-ground slant laser communication. In order to meet the performance requirement of 10-6 of system BER, the zenith angle should be controlled within a small range of about 30 degrees.
作者
唐翰玲
李勇军
李怡
赵尚弘
TANG Hanling;LI Yongjun;LI Yi;ZHAO Shanghong(Institute of Information and Navigation,Air Force Engineering University,Xi'an 710077,China)
出处
《应用光学》
CAS
CSCD
北大核心
2022年第5期1030-1036,共7页
Journal of Applied Optics
基金
空军工程大学创新实践基金(CXJ2021078)。
关键词
激光通信
无人机
空间分集
大气湍流
指向误差
误码率
laser communication
unmanned aerial vehicle
spatial diversity
atmospheric turbulence
pointing error
bit error rate
作者简介
唐翰玲(1989-),男,硕士研究生,主要从事航空激光通信方面的研究。E-mail:thl18932934017@163.com;通信作者:李勇军(1979-),男,教授,博士生导师,主要从事光通信与网络方面的研究。E-mail:tz_228@163.com。
