Authors
Kaifa Kang
Dept of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an, China
Qingmin Zhang
School of Communication Engineering, Xidian University, Xi'an, China
Lei Tian
School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an, China
Xu Yanrui
School of Humanities and foreign languages, Xi'an University of Posts and Telecommunications, Xi'an, China