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In this work, we investigate the performance of a dual-hop multiple relayssystem consisting of mixed Radio-Frequency (RF)/Free Space Optical (FSO)channels. The RF channels are subject to Rayleigh fading while the opticallinks experience the Double Generalized Gamma including atmospheric turbulence,path loss and the misalignment between the transmitter and the receiveraperture (also known as the pointing error). The FSO model also takes intoaccount the receiver detection technique which could be either heterodyne orintensity modulation and direct detection. Partial Relay Selection withoutdated Channel State Information is assumed based on the RF channels toselect a relay and we also consider fixed and variable Amplify-and-Forwardrelaying schemes. In addition, we assume that the relays are affected by thehigh power amplifier non-linearities and herein we discuss two power amplifierscalled Soft Envelope Limiter and Traveling Wave Tube Amplifier. Furthermore,novel closed-forms and tight upper bounds of the outage probability, the biterror probability, and the ergodic capacity are derived. Capitalizing on theseperformance, we derive the high SNR asymptotic to get engineering insightsabout the system gains such as the diversity and the coding gains. Finally, themathematical expressions are validated using the Monte Carlo simulation.

Asymmetric RF/FSO Relaying with HPA non-Linearities and Feedback Delay Constraints