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Optimal Tracking Performance of NCSs with Time-delay and Encoding-decoding Constraints

Jun-Wei Hu, Xi-Sheng Zhan*, Jie Wu, and Huai-Cheng Yan
International Journal of Control, Automation, and Systems, vol. 18, no. 4, pp.1012-1022, 2020

Abstract : In this paper, the tracking performance of networked control systems (NCSs) under energy constraints with time-delay and encoding-decoding is studied. Through spectral factorization and partial decomposition techniques, we can obtain the explicit representation of the optimal performance. It is shown that the optimal performance is affected by non minimum phase (NMP) zeros, unstable poles and other multiple communication constraints such as time-delay, encoding-decoding and additive white Gaussian noise (AWGN). At the same time, the obtained result shows that a two-parameter compensator is superior to a one-parameter compensator. In addition, it is found that time-delay, encoding-decoding and AWGN affected the tracking capability of NCSs. Finally, an example is given for verifying the correctness of the conclusions.

Keyword : Encoding-decoding, networked control systems, NMP zeros, performance, unstable poles.

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