基金Supported by the National Natural Science Foundation of China under Grant No.60572131(国家自然科学基金)the Key Technologies R&D Program of Jiangsu Province of China under Grant No.BE2007058(江苏省科技攻关项目)+4 种基金the Scientific Research Foundation for the Returned Overseas Chinese ScholarsMinistry of Education of China and Nanjing Government(国家教育部和南京市回国人员基金)the Scientific Development Foundation of Government(南京市科技发展计划)the Scientific Research Foundation of NJUPT under Grant No.NY206008(南京邮电大学攀登计划)the Scientific Research Foundation of ZTE and Huawei Corporation of China(中兴及华为基金)