To whom correspondence should be addressed. E-mail: ishtiaq75@ bit. edu. cn; ishtiaq _ sal@ yahoo.com Muhanunad Ishtiaq Ahmad, was born in Paki- stan, in 1975. He received his B.S. degree from the Sir Syed University of Engineering and Technology, Karachi, Pakistan, in 1998 and the M.S. degree from the Muhammad Ali Jinnah University, Islamabad, Pa- kistan, in 2006, both in electronic engineering. He is currently working towards the Ph. D. degree with the School of Information & Electronics, Beijing Institute of Technology, P.R. China. His research interests include statistical signal processing, array signal processing and its applications to communications, radars and