  In this paper, we present the performance analysis of mixed RF/FSO system
with multiple relays. To select the best relay, we adopt partial relay
selection with outdated CSI wherein we investigate the effect of the temporal
correlation of the channels. Unlike the vast majority of work, we introduce the
impairments to the relays and the destination and we compare the performance
against conventional RF relaying systems. We further derive the expressions of
the outage probability and the ergodic capacity as well as the bounds to unpack
engineering insights into the system robustness.
