1. B4G Mobile Communications Research Department; Electronics and Telecommunications Research Institute; 161, Gajeong-Dong Yuseong-Gu Daejeon Korea
2. IoT Convergence Research Department; Electronics and Telecommunications Research Institute; 161, Gajeong-Dong Yuseong-Gu Daejeon Korea
3. Department of Radio Wave Engineering; Hanbat National University; San 16-1, Dukmyung-Dong Yuseong-Gu Daejeon Korea