  This letter presents a unified analytical framework for relay-assisted mixed
FSO/RF transmission. In addition to accounting for different FSO detection
techniques, the mathematical model offers a twofold unification of mixed FSO/RF
systems by considering mixed M\'alaga-$\mathcal{M}$/$\kappa$-$\mu$ shadowed
fading, which includes as special cases nearly all linear turbulence/fading
models adopted in the open literature.
