MIMO Hybrid FSO/RF System Over Generalized Fading Channels

Free-space optics (FSO) communication is often unreliable, especially for long distances, as it suffers from attenuation due to foggy weather, atmospheric turbulence, and pointing errors. To avoid link failure, radio frequency (RF) communication, which unaffected these effects, utilized when FSO in outage. Diversity known counteract the adverse fading therefore, this paper presents a transmit aperture/antenna selection (TAS) combining (SC)-based multiple-input-multiple-output (MIMO) hybrid FSO/RF system. The proposed system consists of MIMO RF sub-systems. sub-system given higher priority receive using selected best link. used probability density function (PDF) cumulative distribution (CDF) expressions TAS/SC-based sub-systems are derived. derived PDF CDF further derive exact asymptotic outage probability, average symbol error rate (SER), capacity From SER expressions, diversity order determined. optimum values threshold SNR beam waist, minimize SER, obtained. Further, obtained optimal analytical verified numerical optimization technique. effect multiple apertures/antennas, errors, over performance analyzed extensively by varying channel parameters. results show that more reliable compared individual systems achieves