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Summary form only given, as follows. Personal wireless communication services are considered as a subset technology of the information age. They have gained importance and visibility over the 1990s, and future technological advancements in this field will be unprecedented. As the thrust into wireless personal communication continues with more advanced and compact technologies the risks increase of "corrupting" the information provided by such communication services because of various types of electromagnetic interference (EMI). To achieve electromagnetic compatibility (EMC) in mobile communication systems requires the right signal with sufficient strength for the customer. Such requirements bring a considerable number of issues, both intra- and inter-system EMI related problems for base stations and between ground stations and mobile units. In this paper we discuss only inter-system problems. The antenna design plays an important role in solving EMI problems of mobile communications systems, some of these design aspects are highlighted in this paper. A comprehensive study has been made for the EMI scenario resulting due to the diffraction scattering, path loss, reflection of paths, and multi-path interference in mobile communications. For prediction of the excessive interference level (EIL) various mathematical models for fading basics, Rayleigh fading, multi-path interference, Doppler spread basics, time delay spread basics, path loss, co-channel, and adjacent channel interference have been examined and analysed.