I gratefully acknowledge the continued encouragement I received from my friends and colleagues from the Department of Electrical Engineering and the Department of Electronics and Communication at the National Institute of Technology Calicut, India.
My former students have been a continuous source of motivation for me. I thank them for their nice words on my previous work.
I thank the team at Pearson Education for their role in shaping this book. In particular, I thank Mr. Sojan Jose, Ms. R. Vijay Pritha and Mr. C. Purushothaman for their editorial inputs.
The credit for the good things the reader finds in this book goes to my esteemed teachers at IIT Madras during 1976–83. The faults in this book, if any, are mine.
Suresh Kumar K. S.