1. Kyung‐Young Jung (corresponding author, ) is with the Department of Electronic Engineering, Hanyang, University, Seoul, Rep. of Korea.
2. Woo‐Jun Yoon () was with the Department of Electrical and Computer Engineering, The Ohio State University, Columbus, USA and is now with the U.S. Naval Research Laboratory, Washington, USA.
3. Yong Bae Park () is with Department of Electrical and Computer Engineering, Ajou University, Suwon, Rep. of Korea.
4. Paul R. Berger () is with the Department of Electrical and Computer Engineering and the Department of Physics, The Ohio State University, Columbus, USA.
5. Fernando L. Teixeira () is with the Department of Electrical and Computer Engineering, The Ohio State University, Columbus, USA.