中文摘要：

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。

英文摘要：

This paper investigates the symbol error rate （SER） performance of radio over free space optics （RoFSO） systems under atmospheric turbulence channel. An average SER closed form expression of BPSK modulation format in RoFSO is derived under weak to strong turbulence condition. Based on the derived expression,the numerical simulation is performed. It is shown that the Rytov variance,the diameter of the receiver collecting lens aperture, and the propagation distance are the key factors which have influence on the average SER. The effects of these three factors are discussed. Finally, the SER performance of MPSK/MQAM modulation format in RoFSO system is studied. The best modulation format with high bit speed and relatively low SER is found.