The design of future generation communication systems depends so much on the suitability of path loss methods and their suitability to various regions. However, such models, no matter how accurate, will result in co-channel interference and wastage of power when they are used in environments for which they were not developed. So, the best bet is to perform site-specific measurements. This research work characterizes the propagation path loss in an urban environment for co-site CDMA2000-800MHz (CDMA2000 1x/UMTS800) and GSM900MHz. Received Signal Strength (RSS) measurements were gathered in Enugu from Mobile Telecommunications of Nigeria (MTN) Network (GSM900) and Visafone Network (CDMA2000 1x) in sites where each Network operates alone and where both Networks shared sites (co-site or coexistence). RSS data gathered was used to characterize Enugu Urban Environment and a propagation Path Loss model, suitable for scenario with Base Station antenna height above the average rooftop was subsequently developed. SINR was generated to evaluate the Link performance of co-site operation in comparison to Single Network operation in a site.

Properly designed handover procedure in cellular wireless systems are essential for maintaining continuity of a call in progress and minimizing the probability of forced termination, signaling and switching load on the network. In this research, the Handover Channel Exchange (HCE) scheme is modeled and analyzed for channels between two mobiles that are moving in opposite directions across the handover area of adjacent cells of a GSM network. The channel exchange method is interesting since it yields low values of handover failure probability as compared to the case with no channel exchange. This work compares the performance of the cellular system with and without channel exchange, using the data obtained from a GSM network, with MATLAB as the platform for the simulation and analysis. The results as presented show improvement in handover failure probability obtained by using the channel exchange as against that of no channel exchange obtained from the GSM network