Abstract

Digital modulation is the technique in which the discrete changes in a message signal are imposed onto parameters (amplitude, frequency, or phase) of a sinusoidal carrier wave. This chapter summarizes the essentials of digital transmission and shows how to assess the quality of a digital transmission by revisiting the mathematical foundation for calculating the probability of error, employing the bit error rate metric, and acquiring knowledge of the eye diagram. It introduces binary shift‐keying modulation in digital transmission and describes the modulation and demodulation principles of amplitude shift keying (ASK), frequency shift keying (FSK) and phase shift keying (PSK) modulations. The chapter shows how to assess the transmission quality of ASK, FSK, and PSK. It also discusses the advantages, shortcomings, and applications of ASK, FSK, and PSK.

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