1. Department of Electrical and Computer Engineering, Michigan State University 1 , East Lansing, Michigan 48824, USA
2. Department of Computational Mathematics, Science and Engineering, Michigan State University 2 , East Lansing, Michigan 48824, USA
3. Science Institute, University of Iceland 3 , Dunhaga 3, IS-107 Reykjavik, Iceland
4. Division of Space and Plasma Physics, School of Electrical Engineering and Computer Science, KTH Royal Institute of Technology 4 , SE-100 44 Stockholm, Sweden
5. Department of Electrical Engineering and Computer Sciences—1770, University of California 5 , Berkeley, California 94720, USA