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理论分析了大气湍流信道下无线光载射频通信系统的误码率,推导出从弱湍流到强湍流环境下采用BPSK调制格式的无线光载射频通信系统平均误码率闭合公式。基于公式,进行了数值仿真,仿真结果表明Rytov指数、接收天线直径和传播距离是影响系统误码率的主要因素,并讨论了误码率随这3个参数的变化趋势。最后研究了MPSK/MQAM在无线光载射频系统中的误码率性能,得到一种具有较低误码率和高比特速率的调制格式。
The bit error rate of wireless optical carrier system under atmospheric turbulence channel is theoretically analyzed, and the average error rate closure formula of wireless optical carrier system using BPSK modulation format is derived from weak turbulence to strong turbulence environment. The numerical simulation is carried out based on the formula. The simulation results show that the Rytov exponent, receiving antenna diameter and propagation distance are the main factors that affect the system BER, and the variation tendency of bit error rate with these three parameters is discussed. Finally, the bit error rate performance of MPSK / MQAM in wireless optical radio frequency system is studied, and a modulation scheme with lower bit error rate and high bit rate is obtained.