中国激光, 2016, 43 (4): 0405002, 网络出版: 2016-03-29
大气湍流综合效应下空间分集接收性能研究
Performance Analysis of Spatial-Diversity Reception over Combined Effects of Atmospheric Turbulence
光通信 空间分集技术 广义超几何 误码率 单入多出 多入多出 optical communications spatial-diversity reception technology generalized hypergeometric method bit error rate single input multiple output multiple input multiple output
摘要
分析和研究大气湍流和瞄准误差综合效应下,空间分集接收技术对差分相移键控(DPSK)光通信性能的改善。在不同湍流情况下,讨论采用多入多出(MIMO)和单入多出(SIMO)空间分集技术的系统性能;并将3种分集合并技术对系统误码率(BER)和中断概率的影响进行分析;采用广义超几何方法推导出自由空间光通信(FSO)系统误码率闭合表达式。由分析和实验结果可知:空间分集技术可以提高系统误码率并降低中断概率,有效地改善大气湍流引起的信道衰落;当分集数增大时,系统性能改变越明显。对比3种分集技术,最大比合并接收分集技术最为优越。
Abstract
The improvement for the spatial-diversity reception technology with the combined effect of atmospheric turbulence and pointing errors based on differential phase shift keying (DPSK) modulation is analyzed and studied. The performance of spatical-diversity reception for multiple input multiple output (MIMO) and single input multiple output (SIMO) systems is discussed, and the bit error rate (BER) and outage probability for three types of diversity reception technologies are investigated under different turbulence situations, and the novel closed form expressions of BER and outage probability for free space optical communication(FSO) system are derived with the generalized hypergeometric method. The analysis and experiment results show that the performance of BER can be improved, the outage probability can be degraded with the spatial-diversity reception technology, and channel fading caused by atmospheric turbulence can be effectively improved. With the number of diversity increased, performance of FSO system is improved obviously. Compared with three diversity reception technologies, the maximum ratio combining diversity reception technology is most advantageous.
张慧颖, 李洪祚, 肖冬亚, 宁素焕. 大气湍流综合效应下空间分集接收性能研究[J]. 中国激光, 2016, 43(4): 0405002. Zhang Huiying, Li Hongzuo, Xiao Dongya, Ning Suhuan. Performance Analysis of Spatial-Diversity Reception over Combined Effects of Atmospheric Turbulence[J]. Chinese Journal of Lasers, 2016, 43(4): 0405002.