Secrecy performance analysis in the FSO communication system considering different eavesdropping scenarios.

Area of Science:

• Optical communications
• Information security
• Wireless communication systems

Background:

• Free-space optical (FSO) systems offer high bandwidth but are vulnerable to eavesdropping.
• Atmospheric turbulence and pointing errors degrade FSO system performance and security.
• Understanding eavesdropping scenarios is crucial for secure FSO system design.

Purpose of the Study:

• To numerically investigate the secrecy performance of FSO systems under three distinct eavesdropping scenarios.
• To model atmospheric turbulence using the Málaga (M)-distribution, incorporating non-zero boresight pointing error and path loss.
• To derive analytical and asymptotic expressions for secrecy outage probability (SOP).

Main Methods:

• Numerical simulations using Monte Carlo methods.
• Development of novel probability density function (PDF) and cumulative distribution function (CDF) for the M-distribution channel.
• Derivation of analytical expressions for SOP under high signal-to-noise ratio (SNR) conditions.

Main Results:

• The study provides novel PDF and CDF expressions for various eavesdropping configurations.
• Analytical and asymptotic SOP expressions are derived for different scenarios.
• Simulation results validate the derived expressions and highlight the impact of system parameters.

Conclusions:

• Eavesdropper location significantly influences FSO system secrecy performance.
• Atmospheric turbulence and pointing errors are critical factors affecting SOP.
• The findings provide valuable insights for enhancing the security of FSO communication systems.