Journal of Shanghai University(Natural Science Edition) ›› 2008, Vol. 14 ›› Issue (3): 239-243 .
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HE Xiao1, ZHANG Xue-fan1, LI Hui-min1, OU Chi-yun2
1. School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China;
2. China Telecom Group Fuzhou Co., Ltd., Fuzhou 350001, Fujian, China