Digital Modulated Transmission

This chapter discusses important general concepts that are applicable to both baseband and modulated digital systems. These include signal orthogonality, signal space, digital transmission model, noise effects, and bit error ratio. Signal‐space diagrams are hugely important and very widely used in digital transmission system modelling and analysis. The chapter aims to provide a sound understanding of vital principles and equip the readers to easily deal with the special cases of digital modulated transmission. These special cases are briefly discussed under the headings of binary modulation, coherent binary detection, noncoherent binary detection, and M‐ary transmission. In binary modulation one symbol is transmitted to represent each bit in the information‐bearing bit stream. The chapter ends with a brief comparison of various digital modulation techniques in terms of the important system design parameters, namely bit rate, transmission bandwidth, signal power, and bit error ratio.