Analog Transmission with Analog Modulation

This chapter examines the need for modulation by studying the difference between baseband and broadband transmissions, and introduces the concept of annalog modulation, in which a carrier is always a sinusoidal signal and a message is always an analog signal. Modulation imposes changes in a message signal onto one of the parameters (amplitude, frequency, or phase) of the carrier wave. The chapter presents mathematical analysis of time‐domain and frequency‐domain presentations of angular (frequency and phase) modulation, and the practical aspects of amplitude, frequency, and phase modulations. Analog transmission is based on analog modulation; therefore, quality of analog transmission can be improved by using various techniques of analog modulation and demodulation.