Robust performance of soft real-time networked control systems with data dropouts

• Published in: Proceedings of the 41st IEEE Conference on Decision and Control, 2002 Vol. 2; pp. 1225 - 1230 vol.2
• Main Authors: Qiang Ling, Lemmon, M.D.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 2002
• Subjects: Density measurement; Feedback control; Networked control systems; Output feedback; Power generation; Power measurement; Power system modeling; Quality of service; Real time systems; Robust control
• ISBN: 0780375165; 9780780375161
• ISSN: 0191-2216
• DOI: 10.1109/CDC.2002.1184681

This paper derives the power spectral density (PSD) of the output generated by a discrete-time feedback control system in which feedback measurements are dropped with a known probability, /spl epsi/. This class of systems is a model for soft real-time control systems in which the feedback path is implemented on a nondeterministic computer network. The PSD computed in this paper is a function of the dropout probability. The dropout probability is taken as a measure of the network quality of service (QoS). Based on the derived PSD, the power semi-norm of the output is predicted. So a direct way of linking control system performance(as measured by the power semi-norm of the output) to the network's QoS (as measured by the dropout probability) is provided.