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为了改善雨、雾、雪等环境因素对大气激光通信系统性能的影响,建立了一种新的多脉冲位置调制(MPPM)系统。在新系统中不但加入了RS编译码器,而且对接收到的信号采用了最大似然检测技术。分析了信噪比、保护时隙持续时间、信息时隙宽度等性能参数。仿真结果表明,适当地选择参数,可以最大程度减少环境因素对大气激光通信的影响,提高大气激光通信系统的性能。
In order to improve the influence of environmental factors such as rain, fog and snow on the performance of atmospheric laser communication system, a new multi-pulse position modulation (MPPM) system is established. In the new system not only joined the RS codec, but also on the received signal using the maximum likelihood detection technology. The performance parameters such as signal to noise ratio, duration of guard slot and information slot width are analyzed. The simulation results show that the proper choice of parameters can minimize the impact of environmental factors on atmospheric laser communication and improve the performance of atmospheric laser communication system.