1. Department of Smart Mobility Engineering, Inha University, Incheon, South Korea
2. Seong Jin Kim is with the Korea Railroad Research Institute (KRRI), Uiwang, South Korea
3. Haejoon Jung is with the Department of Electronic Engineering, Kyung Hee University, Yongin, South Korea
4. Sang Won Choi is with the Department of Electronic Engineering, Kyonggi University, Suwon, South Korea