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Derong Liu is with the Department of Electrical and Computer Engineering, University of Illinois, Chicago, IL 60607-7053, USA (phone: 312-3554455; fax: 312-966-6465; email: dliu@ece.uic.edu). MengChu Zhou is with the Department of Electrical and Computer Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA (email: zhou@njit.edu).