Abstract
This article investigates the state estimation of fractional-order memristive systems with discrete-time terms. By considering discrete fractional calculus, we propose a novel and efficient criterion for ensuring the global Mittag-Leffler stability of the estimation error system. Additionally, by utilizing a functional that incorporates a discrete fractional sum element, we derive the stability condition for the concerned system. It is noteworthy that the proposed approach integrates a vector optimization method, which enhances the understanding of how to construct a meaningful convex closure formed by quaternions. Finally, numerical simulations are conducted to validate the theoretical results.