This paper studies the impact of co-channel interferences (CCIs) on thesystem performance of multi-hop amplify-and-forward (AF) relaying, in a simpleand explicit way. For generality, the desired channels along consecutiverelaying hops and the CCIs at all nodes are subject to Nakagami-$m$ fading withdifferent shape factors. This study reveals that the diversity gain isdetermined only by the fading shape factor of the desired channels, regardlessof the interference and the number of relaying hops. On the other hand,although the coding gain is in general a complex function of various systemparameters, if the desired channels are subject to Rayleigh fading, the codinggain is inversely proportional to the accumulated interference at thedestination, i.e. the product of the number of relaying hops and the averageinterference-to-noise ratio, irrespective of the fading distribution of theCCIs.
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