Event-triggered Sensor Scheduling for Remote State Estimation with Error-Detecting Code

• Published in: IEEE control systems letters Vol. 7; p. 1
• Main Authors: Zhong, Yuxing, Tang, Jiawei, Yang, Nachuan, Shi, Dawei, Shi, Ling
• Format: Journal Article
• Language: English
• Published: IEEE 01.01.2023
• Subjects: Codes; Estimation; Event-triggered estimation; Kalman filtering; Measurement uncertainty; networked control systems; Packet loss; Probability density function; Processor scheduling; State estimation
• ISSN: 2475-1456; 2475-1456
• DOI: 10.1109/LCSYS.2023.3286472

This letter addresses the problem of remote state estimation subject to packet dropouts, focusing on the use of an event-triggered sensor scheduler to conserve communication resources. However, packet dropouts introduce significant challenges, as the remote estimator cannot distinguish between packet loss caused by poor channel conditions and the event trigger. To overcome this issue, we propose a novel formulation that incorporates error-detecting codes. We prove that the Gaussian property of the system state, commonly utilized in the literature, does not hold in this scenario. Instead, the system state follows an extended Gaussian mixture model (GMM). We present an exact minimum mean-squared error (MMSE) estimator and an approximate estimator, which significantly reduces algorithm complexity without sacrificing performance. Our simulation results show that the approximate estimator achieves nearly the same performance as the exact estimator while requiring much less computation time. Moreover, the proposed event trigger outperforms existing schedulers in terms of estimation accuracy.