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自由空间光通信在各种应用中得到了广泛关注,但大气湍流效应导致系统链路性能恶化。假设大气湍流信道是无记忆平稳遍历并且为加性高斯白噪声(AWGN),自由空间光通信系统采用开关键控(OOK)强度调制直接检测(ID/DD),研究了gamma-gamma大气湍流信道下自由空间光通信的性能。利用Meijer G函数推导出了自由空间光通信的性能指标平均误码率的闭合表达式,简化了中断概率和平均信道容量的闭合表达式。在不同大气湍流强度下,根据平均误码率、中断概率、平均容量的闭合表达式分别给出了几个数值仿真实例,分析了大气折射率结构常数、传输距离、信噪比与自由空间光通信系统性能的关系。
Free space optical communication has gained wide attention in various applications, but the atmospheric turbulence effect leads to deterioration of system link performance. Assuming that the atmospheric turbulence channel is memoryless smooth traversal and additive white Gaussian noise (AWGN), free-space optical communication system uses on-off keying (OOK) intensity modulation direct detection (ID / DD) to study the gamma-gamma atmospheric turbulence channel Under free space optical communication performance. Using Meijer G function, the closed expression of the average BER of the performance index of free space optical communication is deduced, and the closed expression of the interrupt probability and the average channel capacity is simplified. Under different atmospheric turbulence intensities, several numerical simulation examples are given based on the average error rate, the probability of interruption, and the closed-form expression of the average capacity. The atmospheric refractive index structure constants, transmission distance, signal-to-noise ratio and free space light Relationship between communication system performance.