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大气湍流引起的乘性噪声会导致大气激光通信链路性能的恶化,引起误码率增加。在Gamma-Gamma湍流信道模型下,采用频域解卷积滤除4PSK调制大气激光通信系统中的乘性噪声。通过计算机仿真对4PSK大气激光通信系统的星座图和误码率进行分析,结果表明在不同天气条件下采用频域解卷积可以滤除系统的乘性噪声,有效地抑制了大气湍流对大气激光通信系统的影响,减小了大气激光通信系统的误码率。
The multiplicative noise caused by atmospheric turbulence can lead to deterioration of the performance of the atmospheric laser communication link, resulting in an increase of bit error rate. Under the Gamma-Gamma turbulence channel model, the frequency domain deconvolution is used to filter out the multiplicative noise in the 4PSK modulated atmospheric laser communication system. The constellation and bit error rate of the 4PSK atmospheric laser communication system are analyzed by computer simulation. The results show that the frequency domain deconvolution can eliminate the multiplicative noise of the system under different weather conditions and effectively suppress the effects of atmospheric turbulence on atmospheric laser Communication system, reducing the error rate of atmospheric laser communication system.