Wang Yi was born in 1975 and received the B. S. and M. S. degrees in communication engineering from University of Electronic Science and Technology of China (UESTC),Chengdu, China, in 1997 and 2003, respectively. He is now pursuing the Ph. D. degree at the National Key Lab of Communication, UESTC. His current research interests include the countermeasures in spread-spectrum communication, Chaotic signal processing techniques and intelligent signal processing techniques. E-mail: wyi@tom.com Guo Wei was born in 1963. He is now the professor of the National Key Lab of Communication, UESTC. His interests include technology of spread-spectrum communication, technology of ad-hoc.