Ben Allen completed his MSc and PhD degrees at the University of Bristol, U.K., in 1997 and 2001 respectively. Having undertaken post-doctorial research in the areas of smart antennas andMIMOwireless systems, he then became a lecturer at the Centre for Telecommunications Research, King's College London where he co-founded the UWB research group. He is now with the Department of Engineering Science, University of Oxford. He has published numerous journal and conference papers in the above areas as well as a book on smart antennas. He has been in receipt of the IEE J Langham Thomson Premium and the ARMMS Best Paper Award, both for publications relating to UWB. He is a senior member of the IEEE, chartered engineer, member of the IEE, and a member of the IEE's Professional Network Executive Committee on Antennas and Propagation. puter Science Contest, Pakistan, in 1998. He is a member of the IEEE and the IET, and serves on the UK Task Group on Mobile and Terrestrial Propagation. Mohammad Ghavami is Reader at the Centre for Telecommunications Research, King's College London. From 1998 to 2000 he was a JSPS Postdoctoral fellow in Yokohama National University, Japan, and from 2000 to 2002 he was a researcher at the Sony Computer Science Laboratories, Inc. in Tokyo, Japan.