Prior to joining LIDS, he spent 5 years at AT&T Research Laboratories and 7 years at the Jet Propulsion Laboratory. His main research interests are the application of mathematical and statistical theories to communication, detection, and estimation problems. Specific current research topics include measurement and modeling of timeˆvarying channels, design and analysis of multiple antenna systems, ultraˆwide bandwidth (UWB) communications systems, optical communications systems, and space communications systems.