1. Graduate School of Engineering, Osaka University, Suita, Japan
2. Ericsson Research, Kanagawa, Yokohama, Japan
3. Advanced Wireless and Communication Research Center (AWCC), The University of Electro-Communications, Tokyo, Chofu-shi, Japan
4. Faculty of Science and Engineering, Doshisha University, Kyotanabe, Japan
5. School of Computer Science and Engineering, Constructor University, Bremen, Germany