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Interference is the important capacity limiting factor in cellular systems. The main source of interference is Co-Channel Interference (CCI) that comes from base stations operating in same frequency band. In this paper a novel method is introduced to evaluate erlang capacities for GSM and CDMA cellular networks. The probability of CCI is considered for capacity evaluation and Rayleigh distributions is used for approximating CCI probability. This evaluation method can be applied for systems where maximum number of interferers is known. Erlang capacity results are evaluated and compared for GSM and CDMA for different number of co-channel interferers.
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