摘要
针对直升机降落过程中产生的中等强度湍流劣化紫外光通信质量的问题,提出了Gamma-Gamma信道下的紫外光近直视通信模型,推导出考虑闪烁衰减的误码率公式,并引入分集接收技术抑制湍流效应,采用仿真进行性能对比。结果表明,在中等强度湍流条件下,闪烁衰减导狡信噪比降低1.73〜2.1 dB,误码率增加92〜2.67×10^(4)倍;湍流强度越强,通信系统的误码率越高;在相同条件下,最大比合并(MRC)性能最佳,等增益合并(EGC)次之,选择性合并(SC)最差,且天线数量增加,能提升紫外光通信系统效能。在中等强度湍流信道中,采用分集接收技术能够有效抑制衰落影响,提升通信质量。
Aiming at the problem that the medium intensity turbulence generated during helicopter landing degrades the quality of UV communication,the UV ALOS communication model in Gamma-Gamma channel was proposed.The BER formula considering flicker attenuation was derived,the diversity reception technology was introduced to suppress the turbulence effect,and the performance was compared by simulation.The results show that under the condition of medium intensity turbulence,scintillation attenuation reduces the SNR by 1.73-2.1 dB and increases the BER by 92-2.67×10^(4) times;The stronger the turbulence intensity,the higher the BER of the communication system is.Under the same conditions,the MRC performance is the best,the EGC follows,the SC is the worst,and with the number of antennas increases,the efficiency of UV communication system will improve.In the medium intensity turbulent channel,diversity reception technology can effectively suppress the influence of fading and improve the communication quality.
作者
李晓毅
冯克涛
吴乐华
王申涛
陈谋
李昆仑
刘博
LI Xiaoyi;FENG Ketao;WU Lehua;WANG Shentao;CHEN Mou;LI Kunlun;LIU Bo(School of Communication Sergeant,Army Engineering University of PLA,Chongqing 400035,China;Unit 78092 of PLA,Chengdu 610036,China)
出处
《陆军工程大学学报》
2022年第1期22-29,共8页
Journal of Army Engineering University of PLA
基金
军内某科研项目(KYCQJWJK1703)。
关键词
紫外光通信
大气湍流
近直视
分集接收
UV communication
atmospheric turbulencej approximate-line-of-sight
diversity reception
