Performance Evaluation Criteria of Hybrid Microwave Systems

Performance evaluations and measurement principles of hybrid information carriers, that is, carriers for partly analog and partly digital source infomation, are established. Simulation requirements, which are independent from a particular hybrid configuration or system capacity, for the analog and digital sources are presented. In order to perform the analysis of multilevel digital streams, a simple formula for the power spectrum density of the random -level Gray-coded stream is derived. With normalization of the formula, the same power density spectrum for any number of levels is achieved. The required length of the pseudorandom sequence as a function of the transmission characteristics and hybrid environment is established. The measurement difficulties, when the noise source is not Gaussian, are discussed.