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Demodulation of Analog Data in Free-Space Optical Communication Systems using Discrete Wavelet Transformation

机译:使用离散小波变换的自由空间光通信系统中的模拟数据解调

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Atmospheric scintillation noise is a fundamental limitation of free space optical communications, as the decrease in signal-to-noise ratio reduces the range and/or bandwidth of the link. A technique employing dual wavelengths has previously been demonstrated to be effective in mitigating scintillation noise by using common mode rejection to remove co-channel noise. However, any practical implementation of this technique will include uncorrelated noise, e.g. amplifier and photodetector noise, which will not be removed. In this paper we consider the limitations that this imposes, and investigate the use of discrete wavelet transformation (DWT) to overcome them. Simulations are performed to validate the use of the DWT in the demodulation of the analog data in the presence of noise. Results of the experiments are presented.
机译:大气闪烁噪声是自由空间光通信的基本限制,因为信噪比的降低会减小链路的范围和/或带宽。先前已证明采用双波长的技术可通过使用共模抑制来去除同频噪声来有效减轻闪烁噪声。但是,该技术的任何实际实现都将包括不相关的噪声,例如噪声。放大器和光电探测器的噪声,这些噪声将无法消除。在本文中,我们考虑了这样做带来的局限性,并研究了使用离散小波变换(DWT)克服这些局限性的方法。进行仿真以验证在存在噪声的情况下,DWT在模拟数据解调中的使用。给出了实验结果。

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