1. Arizona State University, Dept. of Electrical Engineering, PO Box 876206, Tempe, AZ 85287-6206, USA
2. The University of Tennessee, Dept. of Electrical and Computer Engineering, Knoxville, TN 37996-2100, USA
3. SPAWAR Systems Center – Code 2876, 49375 Ashburn Rd, San Diego, CA 92152-7633, USA
4. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Mail Stop 303-300, Pasadena CA 91109-8099, USA