D. Zarifi is with the School of Electrical Engineering, University of
Kashan, Kashan, Iran. A. Farahbakhsh is with the School of Electrical
Engineering, Graduate University of Advanced Technology, Kerman, Iran. A.
U. Zaman and P. S. Kildal are with the Department of Signals and Systems,
Chalmers University of Technology, SE-412 96 GÃ¶teborg, Sweden