Model-Adaptive and Risk-Constrained Frequency Hopping Against Predictive Jammers

Abstract:Adaptive frequency hopping against predictive jamming must address both model uncertainty and policy exposure: the context-loss relationship may vary across operating regimes, while persistent hopping patterns may expose high-probability channels to attack. We propose D-PACT-AFH, a model-adaptive and risk-constrained adversarial contextual-bandit framework in which a Tsallis-FTRL master combines a global linear learner with a partitioned local learner and selects the model class online. D-PACT-Hit incorporates channel-wise marginal hit risk into model selection, while D-PACT-Safe applies a minimum-Kullback-Leibler projection to enforce a per-slot risk budget. We establish estimator validity under non-anticipating attacks, an oracle decomposition relative to the better fixed base, and an exact conditional-risk guarantee for the Safe projection. Experiments across diverse channel regimes and jammer types demonstrate effective model adaptation and a controllable goodput-risk tradeoff: D-PACT-AFH recovers 95.5% of the local learner's gain under observable switching while avoiding 77.7% of its degradation in a negative-control regime.

Machine Learning (cs.LG); Signal Processing (eess.SP)

arXiv:2609.06514 [cs.LG]

(or arXiv:2609.06514v1 [cs.LG] for this version)

https://doi.org/10.48550/arXiv.2609.06514 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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