Journal of Shanghai University(Natural Science Edition) ›› 2007, Vol. 13 ›› Issue (4): 471-476 .
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JIN Yan-liang1, YANG Yu-hang2, JIANG Yi-fan1
1. School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China; 2. Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200030, China