Electronic Engineering Institute PLA, Hefei, China
Electronic Engineering Institute PLA, Hefei, China
Electronic Engineering Institute PLA, Hefei, China
Electronic Engineering Institute PLA, Hefei, China
Copyright © 2017 Xiaosong Zhu, Shaofei Qin, Ming An, Lei Gu et al. This is
an open access article distributed under the Creative Commons Attribution
License, which permits unrestricted use, distribution, and reproduction in any
medium, provided the original work is properly cited.