To whom correspondence should be addressed. E-mail: ybxu@ hit. edu. cn Chert Jiamei, born in 1985. She received the B.S. degree in 2008 and the M.S. degree in 2010, both in Information and Communication Engineering from Harbin Institute of Technology, Harbin, China. Now, she is pursuing her Ph. D degree in Information and Communication Engineering, HIT, China. Her current research interests include WLAN indoor location, artificial intelligence and wireless communica tions.