Communication systems refer to the sending and receiving of electrical impulses over a particular distance by radio, telephone, television, cable, telegraph etc. The whole process of communication involves a few essential fundamentals- transmitter, receiver, noise variable and a channel through which the information is transmitted. Kennedy's Electronic Communication Systems aims to simplify the concepts of this subject and present it in a digestible form. The book explains concepts in a theoretical and illustrative manner. In the fifth edition of this book, the form and tone of the book have been retained but various technological updates have been incorporated in order to keep the students abreast of the latest trends regarding communication systems. A great deal of emphasis has also been placed on the discussions on Digital Communications.