Evaluation of distortion in f.m. trunk radio systems by a Monte Carlo method

Abstract
There exists a considerable body of published work concerned with the theoretical evaluation of distortion arising from various sources in trunk radio systems. The analytical difficulties, however, are often formidable, and simplifying approximations have usually to be made. As a consequence, the theory has developed in a piecemeal fashion, different approaches having to be followed depending on the origin of the distortion. By contrast, the measurement method prescribed by international agreement is of universal application, though it is liable to suffer from the uncertainties inevitable when measurements are carried out in complex and often somewhat ill-defined situations.It is the purpose of the present paper to describe a method of computer simulation of the standard measurement technique, and to give some representative numerical results. The method is in principle capable of good accuracy, and greatly extends the range of distortion problems amenable to theoretical treatment. It is applicable to the evaluation of distortion arising from external interference sources, such as added thermal noise, as well as distortion due to echoes, filtering etc. The present approach is found to give good agreement with existing theory where this may be expected to apply.

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