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基于解码-转发中继方式,研究了混合射频/自由空间光(RF/FSO)航空通信系统性能。采用副载波多进制相移键控调制方式,建立了孔径平均作用下混合RF/激光通信系统模型,其中FSO通信链路采用指数型Weibull大气湍流信道的同时考虑指向误差影响,射频通信链路为Nakagami-m衰落信道。利用Meijer′s G函数推导得到航空激光通信系统平均误码率和中断概率的闭合表达式。在不同湍流强度和接收孔径大小条件下,对比分析了中断概率及误码率性能。仿真结果表明,与弱湍流条件相比,中等湍流强度条件下指向误差对系统中断性能影响较小;孔径平均效应可有效改善混合RF/FSO传输系统的性能;FSO信道对混合系统性能起主要作用。
Based on the decoding-forwarding relay method, the performance of hybrid RF / FSO airborne communication system is studied. The model of hybrid RF / laser communication system with aperture average is established by using subcarrier multi-phase phase shift keying modulation. The FSO communication link adopts exponential Weibull atmospheric turbulence channel and considers the influence of pointing error. The radio frequency communication link Fading channel for Nakagami-m. Using Meijer’s G function, we derive the closed expression of the average error rate and the probability of outage for the aeronautical laser communication system. Under different turbulence intensity and receiving aperture size, the performance of interrupt probability and bit error rate is compared and analyzed. The simulation results show that the pointing error under medium turbulence intensity has less influence on the system interruption performance than the weak turbulence condition. The average aperture effect can effectively improve the performance of the hybrid RF / FSO transmission system. The FSO channel plays a major role in the performance of the hybrid system .