His primary research interests are communication systems, adaptive arrays, and signal processing.
He has authored many articles and books including Principles of Spread-Spectrum Communication Systems, 5th edition (Springer, 2022).
His most important and most cited paper is Statistical Theory of Passive Location Systems.
His most important and most cited book is Principles of Spread-Spectrum Communication Systems.
He received the Military Communications Conference achievement award for sustained contributions to the field in 2004.