Opportunistic Control Over Shared Wireless Channels
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© 2015 IEEE.We consider a wireless control architecture with multiple control loops over a shared wireless medium. A scheduler observes the random channel conditions that each control system experiences over the shared medium and opportunistically selects systems to transmit at a set of non-overlapping frequencies. The transmit power of each system also adapts to channel conditions and determines the probability of successfully receiving and closing the loop. We formulate the optimal design of channel-aware scheduling and power allocation that minimize the total power consumption while meeting control performance requirements for all systems. In particular, it is required that for each control system a given Lyapunov function decreases at a specified rate in expectation over the random channel conditions. We develop an offline algorithm to find the optimal communication design, as well as an online protocol which selects scheduling and power variables based on a random observed channel sequence and converges almost surely to the optimal operating point. Simulations illustrate the power savings of our approach compared to other non-channel-aware schemes.
Published Version (Please cite this version)10.1109/TAC.2015.2416922
Publication InfoGatsis, K; Pajic, M; Pappas, GJ; & Ribeiro, Alejandro (2015). Opportunistic Control Over Shared Wireless Channels. IEEE Transactions on Automatic Control, 60(12). pp. 3140-3155. 10.1109/TAC.2015.2416922. Retrieved from https://hdl.handle.net/10161/10335.
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Nortel Networks Assistant Professor in the Pratt School of Engineering
Miroslav Pajic's research focuses on design and analysis of cyber-physical systems and in particular, embedded and distributed/networked control, real-time and embedded systems, and high-confidence medical device systems.