Manuscript received February 1, 2017; revised July 1, 2017; accepted August 19, 2017. Date of publication September 4, 2017; date of current version July 12, 2018. B. Chen was supported in part by NSFC under Grant 11601158 and in part Fundamental Research Funds for the Central Universities under Grant 2017MS111. H. Liu was supported in part by NSFC under Grant 11171370 and in part by self-determined research funds of CCNU through the colleges’ basic research and operation of MOE under Grant CCNU14F01004.
