作者单位: | Dept. of Elec. & Info. Eng., Huazhong Univ. of Science &Technology, Wuhan 430074, P.R.China,Department of Physics, Huazhong Univ. of Science &Technology, Wuhan 430074, P.R.China,Wuhan Research Institute of Posts and Telecommunications, Wuhan 430074, P.R.China |