1. School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea
2. School of Electronics Engineering, Kyungpook National University, Daegu, South Korea
3. Department of Information and Communications Engineering, Myongji University, Yongin, Gyeonggi, South Korea
4. Satellite Communication Infra Research Section, ETRI, Daejeon, South Korea
5. School of Electrical Engineering, Daejeon, KAIST, South Korea