Lei Xu received her B.S. and M.S. degree from Beijing University of Posts and Telecommunications, China, in 2004 and 2007, respectively, both in electrical engineering. Since 2008, she has been a Ph.D student in the Wireless Communication Network Lab, Department of Electrical Engineering, University of Texas at Arlington. Her current research interests include waveform design, radar system, radar sensor network, MIMO, and wireless communications.