Funding for this research was provided by:
National Natural Science Foundation of China (61371107)
Guangxi Broadband Wireless Communication & Signal Processing Key Laboratory (GXKL061501)
Science and Technology on Communication Networks Laboratory (KX172600033)
National Natural Science Foundation of China (61571143)
Article History
Received: 13 July 2017
Accepted: 4 January 2018
First Online: 29 January 2018
Competing interests
: The authors declare that they have no competing interests.
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