1. School of Electronic Infomation Engineering, ShangHai DianJi University, ShangHai 200240, P. R. China
2. JiangXi Industry Polytechnic College, Nanchang 330096, P. R. China
3. Faculty of Electronic and Information Engineering, West Anhui University, Lu’an 237012, P. R. China
4. Jiangxi Siyuan Technology Co., Ltd., NanChang 330000, P. R. China