Approaches to modelling FM video spectra for satellite signal interference prediction

Three approaches to modelling FM video spectra which include energy dispersal are described. The first method is an analytical approach minimizing computer processing time. The second gives a more complete solution using numerical methods. In the third approach a statistical model is proposed with particular application to interference analysis. Each approach has both advantages and disadvantages, the most suitable method must be chosen depending on the application and availability of data. With limited data samples it is probable that one of the first two techniques can be used. The analytical approach minimizes computation time but is only effective around the carrier. The numerical analysis provides a more complete approach but requires substantial computer processing. Hence, for CCI (cochannel interference) analysis, the analytical method is acceptable. For an ACI (adjacent-channel interference) problem, the FFT (fast Fourier transform) approach is more realistic. The final method relies on the existence of the system to enable extensive data collection to be carried out