激光与光电子学进展, 2020, 57 (5): 050101, 网络出版: 2020-03-05
联合信道条件下自由空间光通信系统性能分析 下载: 1153次
Performance Analysis of Free-Space Optical Communication System under Joint Channel Conditions
自由空间光通信 联合信道 M湍流 平均误码率 平均信道容量 中断概率 free space optical communication joint channel M turbulence average bit error rate average channel capacity outage probability
摘要
大气环境严重影响了自由空间光通信系统的性能。考虑到天气环境、大气湍流以及指向性误差等因素对激光通信的影响,建立了联合信道统计模型,并利用Meijer-G函数推导出基于开关键控调制的自由空间光通信系统的平均误码率、平均信道容量和中断概率等性能参数及其闭合表达式。在不同类型的M湍流、不同的归一化指向性误差以及能见度为5 km和20 km天气的联合信道条件下,对系统性能参数进行仿真与分析。结果表明:指向性误差越小,通信系统性能参数受湍流影响越大;指向性误差越大,越可能存在最佳光束发散角使得通信系统达到最佳性能。
Abstract
The atmospheric environment seriously affects performance of the free space optical communication system. Considering the influence of weather environment, atmospheric turbulence and directivity error on laser communication, we establish a joint channel statistical model, and derive the performance parameters of free space optical communication system based on on-off keying modulation, such as average bit error rate, average channel capacity and outage probability and their closed expressions, using Meijer-G function. The performance parameters of the system are simulated and analyzed under different M turbulences, different normalized pointing errors and visibilities of 5 km and 20 km. The results show that the smaller the directivity error, the greater the influence of turbulence on the performance parameters of the communication systems; the bigger the directivity error, the more likely for a best beam divergence angle existing to make the communication system achieve the best performance.
吴琰, 梅海平, 魏合理. 联合信道条件下自由空间光通信系统性能分析[J]. 激光与光电子学进展, 2020, 57(5): 050101. Yan Wu, Haiping Mei, Heli Wei. Performance Analysis of Free-Space Optical Communication System under Joint Channel Conditions[J]. Laser & Optoelectronics Progress, 2020, 57(5): 050101.