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arXiv · 2505.00481

Stabilization by Controllers Having Integer Coefficients

Joowon Lee·Donggil Lee·Junsoo Kim
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Abstract

The system property of ``having integer coefficients,'' that is, a transfer function has an integer monic polynomial as its denominator, is significant in the field of encrypted control as it is required for a dynamic controller to be realized over encrypted data. This paper shows that there always exists a controller with integer coefficients stabilizing a given discrete-time linear time-invariant plant. A constructive algorithm to obtain such a controller is provided, along with numerical examples. Furthermore, the proposed method is applied to converting a pre-designed controller to have integer coefficients, while the original performance is preserved in the sense that the transfer function of the closed-loop system remains unchanged.

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Joowon Lee, Donggil Lee, Junsoo Kim. 2025-05-01. Stabilization by Controllers Having Integer Coefficients. https://arxiv.org/abs/2505.00481

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