大气激光通信系统中频域解卷积抑制乘性噪声研究.pdfVIP

43 卷 11 期 红外与激光工程 2014 年11 月 Vol.43 No.11 Infrared and Laser Engineering Nov. 2014 Effects of frequency domain deconvolution on suppression of multiplicative noise in an atmospheric laser communication system Deng Lij un, Ke Xizheng, Chen Juan (College of Automation and Information Engineering , Xi 忆an University of Technology , Xi 忆an 710048, China) Abstract: Multiplicative noise brought about by atmospheric turbulence can cause performance deterioration of atmospheric laser communication links, leading to increased error rates. In this study , a method of frequency鄄domain deconvolution was proposed to filter out multiplicative noise in atmospheric laser communication systems. In the Gamma鄄Gamma channel model, the multiplicative noise in a 4PSK atmospheric laser communication system was filtered out using this method. The simulation computations were conducted over the constellation diagrams and bit error rates of the modulation signals before and after deconvolution. The results show that frequency鄄domain deconvolution can smoothly filter out multiplicative noise . The measured and simulated results for near鄄surface sighting distance under different weather conditions were basically consistent, showing that the proposed method can effectively suppress atmospheric turbulence and reduce the bit error rate of atmospheric laser communication systems. Key words: atmospheric laser communication; atmospheric turbulence; multiplicative noise; frequency鄄domain deconvolution