混合毫米波射频/多输入多输出-自由空间光通信中继系统  

Hybrid millimeter wave RF/MIMO-FSO relay system

作　　者：刘维[1] 王静怡 马鑫洋 石文孝[1] 曹景太[1,2] LIU Wei;WANG Jingyi;MA Xinyang;SHI Wenxiao;CAO Jingtai(College of Communication Engineering,Jilin University,Changchun 130012,China;Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130012,China)

机构地区：[1]吉林大学通信工程学院,吉林长春130012 [2]中国科学院长春光学精密机械与物理研究所,吉林长春130012

出　　处：《光学精密工程》2022年第5期536-544,共9页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.62001448)。

摘　　要：为准确评价混合毫米波射频/多输入多输出-自由空间光通信(millimeter Wave Radio Frequency/Multiple Input Multiple Output-Free Space Optical,mmW RF/MIMO-FSO)中继系统的性能,利用Meijer-G函数推导出混合mmW RF/MIMO-FSO中继系统端到端中断概率、误码率以及遍历容量的闭合解析表达式。该混合系统的中继采用固定增益方案、接收端采用等增益合并方式合并多路信号。mmW RF信道服从Nakagami-m衰落,FSO信道服从Gamma-Gamma分布。数值仿真结果显示,MIMO技术可以有效缓解由于大气湍流强度的增强而导致的混合中继系统性能降低。随着激光发射器和光电探测器相对应的收发孔径数目的增加,混合中继系统性能逐渐增强,但与此同时系统的复杂度也不断提高。综合分析可知,当激光发射器发送的激光信号束与光电探测器使用的接收孔径数相等且都为2时,MIMO-FSO链路的性能达到最佳状态。To accurately evaluate the performance of the hybrid millimeter wave radio frequency(RF)and multiple input multiple output(MIMO)free space optical(FSO)relay system,the Meijer G function is used to derive the end-to-end interruption probability,bit error rate and traversal of the hybrid mmW RF/MIMO FSO relay system.Further,the proposed approach employs the closed analytical expression of the capacity.The relay of the hybrid system adopts a fixed gain scheme,and the receiving end adopts an equal gain aggregation scheme to combine multiple equivalent signals.The mmW RF channel obeys Nakagami-m fading,whereas the FSO channel obeys the Gamma-Gamma distribution.The results of numerical simulation show that the MIMO technology can effectively alleviate the performance degradation of the hybrid relay system caused by the intensification of atmospheric turbulence.The performance of the hybrid relay system is gradually enhanced by increasing the number of transceiver apertures.However,this also increases the complexity of the system.Comprehensive analysis shows that the MIMO-FSO link performs best when the number of apertures receiving the laser signal from the transmitter is equal to the number of receiving apertures on the photo detector(i.e.two apertures).

关 键 词：空间光通信 混合射频/自由光通信中继系统 毫米波 多输入多输出 固定增益 

分 类 号：TN929.13[电子电信—通信与信息系统]