Leslie A. Berry

Abstract: Middleton's analytical formula for the probability of communications in a land mobile environment and Berry's computer program for probabilistic calculations of interference are shown to produce identical answers for identical inputs. The assumptions, input, and output of the two models are compared. Middleton's assumption that interfering sources transmit randomly and independently is of particular interest for mobile radio services. The effects of the greater variety of input assumptions possible with the computer method are illustrated numerically. To use Middleton's formula to compute the probability of interference for a detailed scenario, the parameters of Class A noise must be determined from the scenario descriptors. Methods for finding these parameters are explored. To illustrate possible applications, the number of statistically identical links that can operate with specified reliability in a given area is computed with the numerical model.

Keywords: Class A noise; communications probability; mobile radio; probabilistic EMC; probability of interference

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