1. School of Engineering and Mathematical SciencesCity University, Northampton Square, London EC1 V 0HBLondonUK
2. Department of Electronic EngineeringCity University of Hong Kong83 Tat Chee AvenueKowloonHong KongPeople's Republic of China
3. Department of Electronic and Information EngineeringThe Hong Kong Polytechnic UniversityHung HomKowloonHong KongPeople's Republic of China
4. China Unichip Technologies Inc.100 Dicui Road, Liyuan Economic Development DistrictWuxiJiangsuPeople's Republic of China