1. Communication Engineering Department, Tianjin Key Laboratory for Advanced Signal Processing, Civil Aviation University of China, Tianjin, P. R. China
2. Yingkou Jucheng Teaching Technology Development Company, Ltd., Huludao, P. R. China
3. Beijing ZANT Technology Company, Ltd., Beijing, P. R. China
4. Institute of Medical Support Technology, Academy of Military Science, Tianjin, P. R. China