摘要
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（FSO） communication has attracted considerable attention recently for a variety of applications,but atmospheric turbulence can degrade the performance of FSO links.In this paper,the atmospheric turbulence channel was assumed to be memoryless,stationary and ergodic with additive white Gaussian noise（AWGN）,the intensity modulation direct detection（ID/DD） with on-off keying（OOK） was used in FSO communication system.The performance of FSO communication systems was studied over gamma-gamma atmospheric turbulence-induced fading channels.A closed form expression of bit error rate（BER） for FSO communication was derived with Meijer G function and the closed form expressions of outage probability and the average channel capacity were simplified by using Meijer G function.Under different atmosphere turbulence conditions,simulations were done respectively according to the closed form expressions of BER,outage probability and the average capacity.Numerical examples show how the performance of FSO communication is affected by various parameters such as the refractive index structure parameter,the transmission distance,SNR.Simulation results are further demonstrated to confirm the analytical results.
出处
《红外与激光工程》
EI
CSCD
北大核心
2011年第7期1318-1322,共5页
Infrared and Laser Engineering
基金
秦皇岛科学技术与发展计划(201001A083)
