Abstract
In this paper, the groundwork on jamming effect and its alleviation mechanisms in free space optical (FSO) communication are studied over Gamma-Gamma (GG) fading channels along with the pointing error (PE) effects. A closed-form expression of the bit error rate (BER) is evaluated analytically for a single-input single-output (SISO) FSO system in the presence of jammer. The worst case jamming condition for maximization of error is calculated numerically. The jammer channel is considered to be GG distributed. Being the most dominating noise, the jamming signal is acted as the only noise source in the considered FSO set-up. Therefore, this study is performed over additive GG noise channel. The error performances are investigated for different atmospheric turbulence (AT) regimes (weak to strong) and for different PE parameters of jamming noise. Moreover, to combat the jamming effect, a multiple-input single-output (MISO) FSO system is considered. A closed-form expression of the BER of the multiple transmit channels over the GG noise is analytically calculated. The analytical results for both SISO and MISO FSO systems are verified with the help of the simulation results obtained by MATLAB software. It is established that MISO FSO performs better than SISO FSO system in terms of BER performance under the influence of jamming noise. Furthermore, many important observations are made upon the BER performances for different AT and PE parameters for SISO and MISO FSO systems.
Highlights
Free space optical (FSO) communication has put its valuable signature in high speed wireless communication society
The performances of single-input single-output (SISO) and multiple-input single-output (MISO) free space optical (FSO) systems affected by jammer are discussed in terms of bit error rate (BER)
From the figure it is seen that the ABER performance is significantly improved and even for small pointing error (PE) of jamming link the error decreases more rapidly in the 2 × 1 FSO system
Summary
Free space optical (FSO) communication has put its valuable signature in high speed wireless communication society. If any established FSO communication is hampered by a jamming attack, it becomes very difficult to detect the original transmitted data at the receiving end This annoying and sometimes harmful intrusion lead to the Denial-of-Services (DoS) in the wireless optical network [23]. In FSO communication system, due to maximization of the acceptance rate of the incoming signal, a wider FoV is required. It is quite easy for a jammer to reside inside the FoV in order. For alleviation of jamming effect, the MISO FSO system performances are analyzed in terms of BER for different values of PE, worst case jamming, diversity order, and coding loss, and compared with the SISO FSO system.
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