Effect of Soft Errors in Iterative Learning Control and Compensation using Cross-layer Approach

Gu-Min Jeong, Kyoungwoo Lee, Sang-Il Choi, Sang-Hoon Ji, Nikil Dutt

Abstract


In this paper, we study the effects of radiation-induced soft errors in iterative learning control(ILC) and present the compensation techniques to make the ILC systems robust against soft errors. Soft errors are transient faults, which occur temporarily in memories where the energetic particles strike the sensitive region in the transistors mainly under abnormal conditions such as high radiation, high temperature, and high pressure. These soft errors can cause bit value changes without any notification to the controller, affect the stability of the system, and result in catastrophic consequences. First, we investigate and analyze the effects of soft errors in the ILC systems. Our analytical study shows that when a single soft error occurs in the output data from the ILC, the performance of the learning control is significantly degraded. Second, we propose novel learning methods by incorporating the existing techniques across the system abstraction levels in the ILC to compensate for soft-error-induced incorrect output. The occurrence of soft errors is estimated by using a monotonic convergence of the erroneous outputs in a cross-layer manner, and our proposed methods can significantly reduce these negative impacts on the system performance. Under the assumption of soft error occurrence, our analytic study has proved the convergence of the proposed methods in the ILC systems and our simulation results show the effectiveness of the proposed methods to efficiently reduce the impacts of soft-error-induced outputs in the ILC systems.

Keywords


Soft error, iterative learning control, compensation

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References


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DOI: https://doi.org/10.15837/ijccc.2019.3.3513



Copyright (c) 2019 Gu-Min Jeong, Kyoungwoo Lee, Sang-Il Choi, Sang-Hoon Ji, Nikil Dutt

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