ABSTRACT
This chapter deals with the performance of some analog modulation techniques, namely, amplitude modulation (AM), single-sideband (SSB), and frequency modulation (FM), in a mobile radio environment. It introduces the basics of the main analog modulation techniques and analyzes their performance in the presence of both additive and multiplicative noise, having in mind that the multiplicative is what mainly characterizes the mobile radio channel. The chapter explores a general model for the received signal and describes the performance of the modulation technique in the presence of additive and multiplicative noises. It shows that multiplicative noise has a disastrous effect on AM and SSB systems and that the capture effect of the FM systems is not so prominent in the presence of fading. The chapter considers some emerging alternatives that may enhance the performance of the SSB systems, making them suitable for mobile radio applications.
