瞄准误差和Gamma-Gamma大气湍流下信号束散角的优化分析

发布时间：2018-06-24 06:43

本文选题：激光通信 + 最优束散角　；参考：《半导体光电》2017年06期

【摘要】：在自由空间激光通信(FSO)系统中,瞄准误差和大气湍流严重影响系统通信链路,是链路性能恶化的两大主要因素。通过对联合信道的理论分析,建立了信道模型,并利用Meijer G函数推导出了直接探测系统和相干探测系统平均信道容量的表达式。通过在Matlab中的仿真结果可知,在给定瞄准误差和大气湍流的条件下,信号光的光束束散角并非越小越好,而是存在最优束散角,该束散角不仅可以保证系统性能良好,而且使得发射系统功率取得最小值,并且采用相干探测系统可以抑制大气湍流对系统的影响,有效提高系统的性能。
[Abstract]:In the free space laser communication (FSO) system, the aiming error and atmospheric turbulence seriously affect the communication link, which are the two main factors of link performance deterioration. Based on the theoretical analysis of the joint channel, the channel model is established, and the expressions of the average channel capacity of the direct detection system and the coherent detection system are derived by using the Meijer G function. The simulation results in Matlab show that, given the aiming error and atmospheric turbulence, the beam divergence angle of the signal beam is not the smaller the better, but the best beam divergence angle. The beam divergence angle can not only guarantee the good performance of the system, but also the optimal beam divergence angle. Moreover, the system power is minimized, and the effect of atmospheric turbulence on the system can be restrained by using coherent detection system, and the performance of the system can be improved effectively.
【作者单位】：北京卫星信息工程研究所天地一体化信息技术国家重点实验室;
【分类号】：TN929.1

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