1. Department of Electrical and Systems Engineering, Washington University in St. Louis, St. Louis, MO, USA
2. Electrical Engineering and Computer Science Department, Massachusetts Institute of Technology, Cambridge, MA, USA
3. Department of Electrical and Computing Engineering, Duke University, Durham, NC, USA
4. Department of Electrical Engineering, Columbia University, New York, NY, USA
5. Department of Electrical and Computer Engineering, Northwestern University, Evanston, IL, USA
6. Texas Instruments, Inc., Dallas, TX, USA