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。 The performance improvement of differential phase shift keying (DPSK) optical communication by spatial diversity receiving technique is analyzed and studied under the combined effect of atmospheric turbulence and aiming error. Under different turbulence conditions, the system performance using MIMO and SIMO spatial diversity techniques is discussed. The impact of the three diversity combining techniques on system BER and interrupt probability The generalized hypergeometric method is used to derive the closed-form expression of bit error rate in free space optical communication (FSO) system. From the analysis and experimental results, we can see that space diversity technology can improve the system error rate and reduce the probability of outage, effectively improve the channel fading caused by atmospheric turbulence; when the diversity number increases, the system performance changes more obvious. Comparison of three kinds of diversity technology, the maximum ratio of receiver diversity is the most superior.