Analysis of Interference and Chanel Capacity in a CDMA Wireless Network Using Dynamic Channel Assignment (DCA) Strategy

摘要

There had been astronomical increase in the number of mobile users in recent times. Investigation had shown that these increased numbers of mobile users contribute high percentage of interferences that degrades the Quality of Services (QoS) in wireless network. Hence, interference is the most limiting factor of improved capacity in CDMA cellular network and has been one of the problems militating against the high efficiency of any mobile network. In effect, the scarcity of radio frequency spectrum and the ever increasing network users has necessitated the need to adopt some channel assignment algorithm to achieve acceptable spectrum efficiency. This paper therefore analyses interferences in a CDMA-based DCA algorithm with special emphasis placed on Adjacent Channel Interference (ACI) and Co-Channel Interference (CCI). The CDMA system used in this study is Zoom, one of the leading mobile wireless networks in South-East Nigeria. The developed models are simulated using Matlab. It was therefore discovered that interferences have prominent roles to play in reliable channel assignment strategy and network capacity in wireless system. Hence, in this paper, any reduction in interferences in cellular systems translates into improving channel capacity of a wireless network.