Phase-Shift Design and Channel Modeling for Focused Beams in IRS-Assisted FSO Systems

As a potential solution for the backhaul of next-generation mobile or low Earth orbit (LEO) satellites, free-space optical (FSO), has received much attention recently. Various techniques have been suggested employing an intelligent reflecting surface (IRS) in FSO systems, such as anomalous reflection, power amplification, and beam splitting. It is also possible to deliver more receiver (Rx) by collimating focusing reflected at Rx lens. In this paper, we propose phase-shift design IRS focusing. addition, new pointing error model outage performance analysis case when width comparable less than aperture size Rx. The analytical results are validated Monte Carlo simulations. This paper provides essential preliminary future research that assumes focused systems.