時　間：2013年4月9日 星期二 13:20 ~ 15:10

地　點：工程三館345教室

演講者：王藏億 教授

講 題：Collaborative Sensor- Fault Detection And Robust Distributed Estimation in Wireless Sensor Networks

演講大綱：

This presentation will begin with introducing distributed detection and estimation theory. The presentation will then address the problem of robust distributed estimation in the presence of sensor faults when the fusion center sequentially receives quantized messages from local sensors. The mean square error (MSE) of distributed estimation schemes increases dramatically if the information received from the faulty sensors within the network is not excluded from the estimation process. Accordingly, an efficient collaborative sensorfault detection (CSFD) scheme is proposed in which the results of a homogeneity test are used to identify the faulty nodes within the network such that their quantized messages can be filtered out when estimating the parameter of interest. Utilizing an asymptotic analytical technique, a lower bound is derived for the MSE of the proposed distributed estimation scheme. A good agreement is observed between the simulated MSE results and the lower bound values, and thus it is inferred that the lower bound provides a convenient and reliable means of predicting the performance of the proposed estimation scheme in realworld sensor networks. In addition, a lowcomplexity CSFD (LCCSFD) scheme is proposed to identify faulty sensors in WSNs with a very large number of nodes. The simulation results confirm that the accuracy of the estimates obtained from the CSFD and LCCSFD schemes is significantly better than that obtained from a conventional estimation scheme when applied in sensor networks characterized by an unknown number of sensor faults of various types.

演講者簡歷：

TsangYi Wang received the Ph.D. degree in electrical engineering from the Syracuse University, NY, in 2003. From 2004 to 2006, he was an Assistant Professor in the Graduate Institute of Communication Engineering at National Chi Nan University, Nantou, Taiwan. In February 2006, he joined the faculty of the Institute of Communications Engineering, National Sun Yatsen University, Kaohsiung, Taiwan, as an Assistant Professor. He was promoted to Professor in August 2012. He has served as a Reviewer Editor of Journal of Wireless Communications and Mobile Computing. His research mainly focuses on distributed detection and estimation with applications in wireless communications and wireless sensor networks. Dr. Wang received the 2008 Best Paper Award for Young Scholars awarded from IEEE Information Society Taipei Chapter and IEEE Communications Society Taipei/Tainan Chapter.

主持人：陳志成 教授