Key;
Laboratory;
of;
Wireless;
Mobile;
Communications,;
China;
Academy;
of;
Telecommunications;
Technology;
(CATT),;
Beijing;
100191,;
China;
Engineering;
Laboratory;
of;
New;
Generation;
Mobile;
Telecommunication;
Wireless;
Network;
and;
Chip;
Technology,;
Beijing;
100191,;
China;