The probability functions of a sum of co-channel interference signals in a mobile cellular network are analyzed under the assumption that the signal variations follow the Rayleigh distribution and the mean power decreases as dn where n=-3.5: On numerical examples it is shown that the probability function of the sum of interfering signal can be approximated with a Rayleigh distribution with the mean roughly equal to the men of the strongest interference signal. A comparison of efficiency between two cellular systems is carried out based on these facts.
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