大气湍流及瞄准误差对激光通信误码率影响研究

以Gamma-Gamma大气湍流信道和探测器信号两个模型为基础，采用直接检测（IM／DD）开关键控（OOK）强度调制方式，推导出了自由空间光系统误码率闭合表达式，分析了大气湍流、归一化光束宽度、归一化瞄准误差等对系统性能的影响；对系统误码率闭合表达式进行了数值模拟分析，结果表明在固定发射功率下通过优化发射光束宽度、减小瞄准误差可以使系统性能达到最优。

Bit Error Rate Analysis of Laser Communication over Atmospheric Turbulence Channel with Pointing Errors

Based on both Gamma-Gamma atmospheric turbulence channel and photoelectric detection signal model,the FSO system used intensity-modulation/direct detection(IM/DD)with on-off key (OOK) and the novel closed-form expressions of bit error rate (BER)for FSO system was derived.How the performance is affected by the atmospheric turbulence and other parameters such as the normalized beamwidth,the normalized jitter was researched.Numerical simulation was further provided to verify the derived analytical expressions.The results show that optimizing the beamwidth and reducing the point error can achieve the minimum BER for a given average transmitted optical power.