中文摘要：

李波：To whom correspondence should be addressed. E-mail： chinasdleebo@ yahoo.com.cn； Li Bo, born in 1980. He received his B.S. degree in Communication Engineering from the Air Force Engi-neering University in 2001, and the M.S. degree in communication and information system from Xidian University in 2004. He is currently working toward the Ph. D degree in the School of Telecommunications Engineering, Xidian University. His research interests are in the general areas of signal processing and communications.