中文摘要：

To whom correspondence should be addressed. E-mail： xlin1977 @ 126. com. Lin Xin, born in 1977. She received her B.S. and M.S. degrees from Harbin University of Science and Technology in 2000 and 2003 respectively. She is now a lecture of Shanghai Jiao Tong University and a Ph. D student of Shanghai Institute of Micro System and Information Technology, Chinese Academy of Sciences. Her research interests include wireless sensor network, distributed video code.