Optimal control of LTI systems over unreliable communication links

  • Authors:

  • Orhan C. Imer;Serdar Yüksel;Tamer Başar

  • Affiliations:

  • GE Global Research Center at Information and Decision Sciences Laboratory, 1 Research Circle, Niskayuna, NY 12309, USA;Department of Electrical and Computer Engineering and Coordinated Science Laboratory, University of Illinois, 1308 West Main Street, Urbana, IL 61801-2307, USA;Department of Electrical and Computer Engineering and Coordinated Science Laboratory, University of Illinois, 1308 West Main Street, Urbana, IL 61801-2307, USA

  • Venue:
  • Automatica (Journal of IFAC)
  • Year:
  • 2006

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Abstract

In this paper, optimal control of linear time-invariant (LTI) systems over unreliable communication links is studied. The motivation of the problem comes from growing applications that demand remote control of objects over Internet-type or wireless networks where links are prone to failure. Depending on the availability of acknowledgment (ACK) signals, two different types of networking protocols are considered. Under a TCP structure, existence of ACK signals is assumed, unlike the UDP structure where no ACK packets are present. The objective here is to mean-square (m.s.) stabilize the system while minimizing a quadratic performance criterion when the information flow between the controller and the plant is disrupted due to link failures, or packet losses. Sufficient conditions for the existence of stabilizing optimal controllers are derived.