Chauhan Isha, Paul Pratiti, Bhatnagar Manav R, Nebhen Jamel
Appl Opt. 2021 Mar 1;60(7):1856-1863. doi: 10.1364/AO.414456.
In this paper, the effect of jamming in a free-space optical (FSO) communication system that employs optical space shift keying (OSSK) is studied. The optical link suffers from saturated atmospheric turbulence (AT). Hence, the channel fading coefficients follow negative exponential probability density function (PDF). Along with additive Gaussian noise, the jammer, under consideration, is an additional source of noise, and jamming signals also suffer from saturated AT. Thus, the jamming channel also follows the negative exponential PDF. A multiple-input single-output (MISO) FSO system is used to mitigate the effects of jammer and channel fading. Explicitly, we employ a 2×1 MISO-OSSK system for analysis and derive a closed-form expression of bit error rate (BER) of the considered system. Moreover, the jammer's effect is also studied numerically under the gamma-gamma (GG) fading channel.
本文研究了采用光空间移位键控（OSSK）的自由空间光（FSO）通信系统中的干扰效应。光链路受到饱和大气湍流（AT）的影响。因此，信道衰落系数服从负指数概率密度函数（PDF）。除了加性高斯噪声外，所考虑的干扰器是另一个噪声源，并且干扰信号也受到饱和AT的影响。因此，干扰信道也服从负指数PDF。采用多输入单输出（MISO）FSO系统来减轻干扰器和信道衰落的影响。具体而言，我们采用一个2×1的MISO-OSSK系统进行分析，并推导了所考虑系统的误码率（BER）的闭式表达式。此外，还在伽马-伽马（GG）衰落信道下对干扰器的影响进行了数值研究。
