This book, Communication Electronics – I, is designed as per the syllabus of DECE-IA (PaperXII). It provides an introduction to wireless communication systems and gradually builds a strong
foundation in both analogue and digital modulation techniques. The content begins with the
fundamentals of communication systems, including classification, block diagrams, and the
necessity of modulation. It then covers amplitude modulation in depth, addressing its theory,
mathematical representation, bandwidth, and circuit implementations. Further, it explores
frequency modulation, its mathematical foundation, and generation techniques. The final unit
focuses on analogue and digital pulse modulation, including PAM, PWM, PPM, and PCM, with
emphasis on their principles, generation, detection, and applications. Numerical problems are
included in relevant sections to reinforce learning.