1. Research and Development Research Center, Hyundai Mobis, Gyeonggi-do, Yongin-si, South Korea
2. Department of Electronic Engineering, Division of Smart Robot Convergence and Application Engineering, Pukyong National University, Busan, South Korea
3. Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, NC, USA
4. Radio and Satellite Research Division, Communication and Media Research Laboratory, Electronics and Telecommunications Research Institute, Daejeon, South Korea