Tian Jifeng, bom in 1976. He received his B.S. and M.S. degrees in electronic engineering from Harbin Engineering University in 1999 and 2001, respectively. He is currently working toward the Ph. D. degree in elec- tronic engineering at Shanghai Jiaotong University, Shang- hai, China. His research interests include space-time coding and OFDM technology.To whom correspondence should be addressed. E-mail: jeffhrb@ hotmail, com