**Author details**

Qiaoyu Li1,<sup>⋆</sup>, Ying Li2, Lin Bai1 and Jinho Choi<sup>3</sup>

<sup>⋆</sup> Address all correspondence to: q.li@ee.buaa.edu.cn

1 School of Electronic and Information Engineering, Beihang University, Beijing, China 2 Institute of China Electronic Equipment System Engineering Corporation, Beijing, China 3 School of Information and Communications, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea
