In this paper influence of co-channel interference (CCI) on the digital mobile radio systems operating over Nakagami-q (Hoyt) fading channels is investigated. Useful expressions are derived for average error rates over coherent and non-coherent frequency and phase- shift keying modulation schemes in interference limited system. The effect of selection diversity on the performance improvement for various values of fading severity and input signal-to-interference ratio (SIR) unbalance is also examined.

Keywords: Nakagami-q (Hoyt) fading; Co-channel interference; Signal-tointerference ratio; Average error probability; Selection diversity technique