湍流信道下基于MDPPM的可见光通信性能研究

Research on the performance of visible light communication in turbulent channel based on MDPPM

针对室外可见光通信受到大气湍流因素影响的问题,采用广义超几何法,综合分析Gamma-Gamma信道下大气湍流及不同天气条件对可见光通信系统平均误时隙率(SER)的影响。仿真分析表明:16进制差分脉冲位置调制(16DPPM)可有效改善湍流效应影响;采用等增益合并(EGC)接收技术,系统平均SER明显降低;湍流信道下,晴朗、雾霾、薄雾和中雾天气时,与16DPPM单入单出系统相比,采用接收天线为3根或4根的16DPPM单入多出系统的平均SER得到明显改善。

In view of the problem that the outdoor visible light communication is influenced by the atmospheric turbulence,the influence of atmospheric turbulence and different weather conditions on the average time slot error rate(SER)of the visible light communication system under the Gamma-Gamma channel has been comprehensively analyzed by the generalized hypergeometric method.The simulation analysis shows that 16-order differential pulse position modulation(16DPPM)can effectively suppress the effects of turbulence,the average SER is significantly reduced by equal gain combined(EGC)reception merge receiving technique.Under the turbulence channel,the average SER of the 16DPPM based on single input multiple output system with three or four receiving antennas is significantly improved compared with the 16DPPM single input single output system when it is sunny,haze,mist and medium fog weather conditions.