PEYTON Z. PEEBLES, JR., is Professor Emeritus of Electrical and Computer Engineering at the University of Florida. His teaching, research, and industrial experience span three decades. Dr. Peebles has written more than fifty papers, mainly on radar-related topics, and a number of well-received textbooks, including Principles of Electrical Engineering; Digital Communication Systems; Probability, Random Variables, and Random Signal Principles; and Communication System Principles.