1. Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2. Facility for Rare Isotope Beams, Michigan State University, East Lansing, MI, 48823, USA
3. Department of Electronic and Electrical Engineering,
University of Bath, Bath BA27AY, United Kingdom
4. Brookhaven National Laboratory, Upton, New York
11973, USA