论文部分内容阅读
大气湍流引起的光强起伏是影响激光通信系统接收信噪比和误码率的主要因素。文中旨在研究大气湍流状态对无线通信系统性能的影响。首先利用对数正态分布和Gamma-Gamma分布分别对信道进行建模,分析表明前者不适用于中强湍流下的光强起伏行为,而后者具有更广的应用范围。在此基础上,研究相位噪声对系统接收信噪比和误码率的影响。文中最后在不同信道条件下进行仿真实验,观察光强起伏方差引起的星座图变化和误码率恶化情况。实验结果表明,当光强起伏方差逐渐增大时,星座图相位角度和误码率均随之变大。文中的分析与讨论对提高激光通信质量具有一定的参考价值。
Atmospheric turbulence caused by fluctuations in the intensity of the laser communication system to receive the signal-to-noise ratio and bit error rate of the main factors. The purpose of this paper is to study the influence of atmospheric turbulence on the performance of wireless communication systems. First, the channel is modeled by logarithmic normal distribution and Gamma-Gamma distribution respectively. The analysis shows that the former is not suitable for the light intensity fluctuation under medium-strong turbulence, while the latter has a wider range of applications. Based on this, the effect of phase noise on the received signal-to-noise ratio and bit error rate of the system is studied. Finally, the simulation experiments under different channel conditions were carried out to observe the change of constellation and the deterioration of bit error rate caused by the fluctuation of light intensity. Experimental results show that the constellation phase angle and bit error rate increase with the increase of the variance of light intensity. The analysis and discussion in the text have certain reference value to improve the laser communication quality.