title: Performance limitations of networked control systems with quantization and packet dropouts.
abstract: This paper investigates the problem of optimal tracking performance of networked control systems (NCSs) with quantization and packet-dropouts. The system under consideration is linear time-invariant (LTI), multi-input multi-output (MIMO), where an H2norm of error signal between the reference input and the system output is used as the tracking performance index. The impacts of packet-dropouts in the communication channel and the quantized input and output are studied. The goal is to obtain the minimal error in tracking a random signal, by searching through all possible stabilizing two-parameter controllers. It is shown that, the minimum value of tracking error is closely related to the reference input signal direction, the non-minimum phase zeros and unstable poles of the given plant, including the locations and directions. We also demonstrated the quantization error and the packet-dropouts may degrade the tracking performance. A typical example is given to evaluate the theoretical results.
authors.affiliation: College of Mechatronics and Control Engineering, Hubei Normal University, Huangshi 435002, PR China; College of Automation, Huazhong University of Science and Technology, Wuhan 430074, PR China.
authors.forename: Xiao-Wei
authors.initials: XW
authors.lastname: Jiang
authors.affiliation: College of Mechatronics and Control Engineering, Hubei Normal University, Huangshi 435002, PR China. Electronic address: jxw07045136@126.com.
authors.forename: Xian-He
authors.initials: XH
authors.lastname: Zhang
authors.affiliation: College of Automation, Huazhong University of Science and Technology, Wuhan 430074, PR China.
authors.forename: Zhi-Hong
authors.initials: ZH
authors.lastname: Guan
authors.affiliation: School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan 430074, PR China.
authors.forename: Li
authors.initials: L
authors.lastname: Yu
authors.affiliation: School of Information Science and Engineering, East China University of Science and Technology, Shanghai 200237, PR China.
authors.forename: Huai-Cheng
authors.initials: HC
authors.lastname: Yan
keywords: Networked control systems; Optimal tracking; Packet-dropouts; Quantization