- 2010/04 - 現在 Doshisha University, Faculty of Science and Engineering, Professor
- 2004/04 - 2010/03 Doshisha University, Faculty of Engineering, Associate Professor
- 2003/07 - 2004/03 Matsushita Electronics Industrial, Co., Ltd, Next-Generation Mobile Development Center, Staff Engineer
- 2003/01 - 2003/06 Panasonic Mobile Communications Co., Ltd, R&D Center, Corporate Engineering Division, Staff Engineer,
- 2002/08 - 2002/12 Matsushita Communications Industrial Co., Ltd, Wireless Solution Labs, Corporate Engineering Division Staff Engineer
- 2001/10 - 2002/07 Advanced Telecommunications Research Institute International Department 3, Adaptive Communications Research Laboratories Researcher
- 2000/04 - 2001/09 ATR Adaptive Communications Research Laboratories, Kyoto, Japan Department of Research on Advanced Wireless Communications Researcher
- 1994/12 - 1996/03 Xidian University, National Key Laboratory on Theory and Chief Technology of Integrated Service Networks, Associate Professor,
- 1988/12 - 1994/11 Xidian University, Department of Information Engineering, Lecturer
- 1987/01 - 1988/11 Xidian University, Xi'an, China, Department of Information Engineering, Assistant Professor