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In this paper, the effects of interference on composite fading environments,where multipath fading coexists with shadowing, are investigated. Based on somemathematical convenient expressions for the sum of squared$\mathcal{K}$-distributed random variables, which are derived for the firsttime, important statistical metrics for the signal to interference and noiseratio (SINR) are studied for various cases including non identical, identicaland fully correlated statistics. Furthermore, our analysis is extended tomulti-channel receivers and in particular to selection diversity (SD)receivers, investigating two distinct cases, namely, signal-to-noise ratiobased and SINR-based SD. For all scenarios, simplified expressions are alsoprovided for the interference limited case, where the influence of thermalnoise is ignored. The derived expressions are used to analyze the performance,in terms of the average bit error probability (ABEP) and the outage probability(OP), of such systems operating over composite fading environments. A high SNRanalysis is also presented for the OP and the ABEP, giving a clear physicalinsight of the system's performance in terms of the diversity and coding gains.The analysis is accompanied by numerical evaluated results, clearlydemonstrating the usefulness of the proposed theoretical framework.

Mobile Communication Systems in the Presence of Fading/Shadowing, Noise and Interference