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Jia-Xiang Geng

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Preprint Oct 2026

Progressive-Observation Physical-Layer Fingerprinting for Efficient Open-Set Ethernet Authentication

Physical-layer fingerprinting (PLF) has emerged as a promising authentication approach for Internet of Things devices. However, most PLF systems acquire and process a fixed-length waveform for every authentication query, burdening resource-constrained edge nodes. To address this issue, we propose a progressive-observat...

Chen-Ming Zhang, Jia-Xiang Geng, Ai-Qun Hu et al. · 0 citations
Book Open access Oct 2026

MobileRLHF: Towards Privacy-Preserving and Self-Improving LLM-Based Local Health Agents on Smartphones via Federated RLHF

Mobile and wearable sensing enables health agents to provide personalized insights from users' health data, but existing cloud-hosted LLM backends raise privacy concerns. We present MobileRLHF, a privacy-preserving and self-improving framework that enables human-feedback-driven preference adaptation directly on commodi...

Jia-Xiang Geng, Lin-Xi Ju, Lu Zhao et al. · 0 citations
Sep 2026

Geometric Feature-Aware Trajectory and Offloading Joint Optimization for Multi-UAV Networks

This paper investigates joint trajectory planning and computation offloading in multi-UAV assisted mobile edge computing (MEC) networks within complex 3D urban environments. Existing deep multi-agent reinforcement learning (MARL) methods often oversimplify obstacles as geometric no-fly zones, ignoring fine-grained chan...

Bo-Wen Zhao, Zhe Zheng, Jia-Xiang Geng et al. · 0 citations

Just Talk Once: Communication-Efficient Split Federated LLM Fine-Tuning on Edge Devices

L-shaped SFT is presented, a split fine-tuning framework that removes the need for continuous client participation and introduces one-shot SFT, in which clients upload activations once and then go offline while the server continues optimization over cached representations.

Jia-Xiang Geng, Xian-Hao Chen, Bing Luo · 0 citations
#machine learning Preprint Aug 2025

FlexP-SFT: A Flexible Aggregation-Free Framework for On-Device Personalized Split Federated Fine-Tuning of LLMs

FlexP-SFT is proposed, a novel aggregation-free framework for personalized split federated fine-tuning, which fundamentally eliminates the client-side aggregation process and introduces a layer-flexible alignment strategy to balance personalization and generalization capabilities.

Jiaxiang Geng, Tianjun Yuan, Pengchao Han et al. · 3 citations

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