سبحان زارعي جعفرآبادي

With the growing need for high-capacity data transmission, free-space optical communication systems based on orbital angular momentum beams have gained attention as a promising solution. By leveraging the unique characteristics of orbital angular momentum beams, these systems enable increased transmission capacity through spatial multiplexing. However, their performance is affected by detrimental environmental factors an‎d security threats, including atmospheric turbulence an‎d the jamming phenomenon. This research provides a systematic analysis of the simultaneous effects of these two factors on the performance of free-space optical communication systems based on orbital angular momentum beams. In this regard, a channel transmission model has first been developed by considering the effects of atmospheric turbulence based on the beta distribution. Then, by deriving an exact expression for the bit error rate in a noisy environment, a closed-form an‎d integral-free analytical formulation for calculating this parameter has been presented. Subsequently, the jamming phenomenon has been modeled in both continuous an‎d non-continuous modes, taking into account the characteristics of orbital angular momentum beam-based signals, an‎d its impact on system performance has been analyzed. Simulations based on realistic operational parameters indicate that the jamming phenomenon can have a significant detrimental effect on system performance, leading, under specific conditions, to an increase in the bit error rate. Furthermore, a comparison between continuous an‎d non-continuous jamming modes reveals that the system is more vulnerable to intermittent attacks under certain conditions. These findings emphasize the necessity of developing resilience strategies in the design of practical free-space optical communication systems.

جمر , نوسانات جوي , انتخاب مد

Jammer , Atmospheric Turbulence , Mode selec‎tion

Sobhan ZareiJafarAbadi

Dr. S. Alireza Nezamalhosseini EzAbadi