Computing Distortion in Analog FM Communication Systems

Theoretically, analog FM signals generally possess an infinite bandwidth. Thus, when such signals are passed through a linear system having a finite bandwidth, some FM distortion must occur. T h e measurement of such distortion is costly and very time consuming. Accordingly, the development of methods for the computation of FM distortion is of practical interest. T h e purpose of this paper is to describe how we used the theoretical results derived by A. Mircea, 1 E. Bedrosian 2 and S. (). Rice 3 to develop a computer program to compute the FM distortion resulting from linear time-invariant-filter structures. The input baseband modulation is taken to be a zero-mean, stationary Gaussian process having an arbitrary baseband power spectral density.