Modern life runs on a range of telecommunication systems such as telephone networks, computer networks, internet, etc. The improvement, design and development of such telecommunication systems fall under the field of telecommunication engineering. It is an interdisciplinary field which combines the principles of electrical and computer engineering. Advances in this discipline have contributed to the technological progress of modern telecommunication tools such as satellites, optical fibre, etc. This book is compiled to provide thorough information about the fundamental concepts and theories of telecommunication systems. This book, with its easy to comprehend language and extensive use of examples, will serve as an essential guide for students and experts.