[1
]National Mobile Communications Research Laboratory, Southeast University, Nanjing,
Jiangsu, China
[2
]Institute for Digital Communications, Friedrich-Alexander-University ErlangenNrnberg,
Erlangen, Germany
[3
]School of Electronic Engineering and Computer Science, Queen Mary University of London,
London, U.K.
[4
]Information Engineering School, Nanchang University, Nanchang, Jiangxi, China
[5
]CNRS, CentraleSupélec, Laboratoire des Signaux et Systèmes, Université
Paris-Saclay, Gif-sur-Yvette, France
[6
]Center for Pervasive Communications and Computing, University of California, Irvine,
CA, USA
[7
]The Chinese University of Hong Kong, Shenzhen and Shenzhen Research Institute of Big
Data, Shenzhen, Guangdong, China
[8
]Department of Information Engineering, The Chinese University of Hong Kong, Shatin,
Hong Kong