Gamma-Gamma湍流中副载波大气光通信系统的性能分析

Performance Analysis of Atmospheric Laser Communication System with Subcarrier Modulation over Gamma-Gamma Turbulence

基于Gamma-Gamma光强闪烁分布大气湍流信道,在各种强度的湍流特性下而非仅限于弱湍流的分析背景,对采用数字副载波相移键控(PSK)强度调制技术的大气激光通信系统的差错性能进行研究与分析。选取一定发散角与接收孔径参数值,分别在不同闪烁强度与接收系统噪声下对系统的比特误码率(BER)进行了仿真,并以线性分组编码为例对系统的性能改进进行了仿真与讨论。

We used Gamma-Gamma scintillatioin distribution to model the atmospheric turbulence channel and analyzed the error performance of the atmospheric laser communication system with digital subcarrier phase shift keying（PSK） intensity modulation over comprehensive turbulence intensity characteristics. Under a certain transmitting divergence angle and receiving diamter,the hit error rate（BER） was simulated with different scintillation variances and noises of the receiving system. Block coding was used as an example to simulate and discuss the performance improvement.