UniFi: Combining Irregularly Sampled CSI from Diverse Communication Packets and Frequency Bands for Wi-Fi Sensing

• URL: http://arxiv.org/abs/2512.22143v1
• Date: Sun, 14 Dec 2025 03:01:31 GMT
• Title: UniFi: Combining Irregularly Sampled CSI from Diverse Communication Packets and Frequency Bands for Wi-Fi Sensing
• Authors: Gaofeng Dong, Kang Yang, Mani Srivastava,
• Abstract summary: Existing Wi-Fi sensing systems rely on injecting high-rate probing packets to extract channel state information (CSI)<n>We present UniFi, the first Wi-Fi-based ISAC framework that fully eliminates packet injection.<n>UniFi integrates a CSI sanitization pipeline to harmonize heterogeneous packets and remove burst-induced redundancy.<n>CommCSI-HAR is the first dataset with irregularly sampled CSI from real-world dual-band communication traffic.
• Score: 4.566213967107035
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Existing Wi-Fi sensing systems rely on injecting high-rate probing packets to extract channel state information (CSI), leading to communication degradation and poor deployability. Although Integrated Sensing and Communication (ISAC) is a promising direction, existing solutions still rely on auxiliary packet injection because they exploit only CSI from data frames. We present UniFi, the first Wi-Fi-based ISAC framework that fully eliminates intrusive packet injection by directly exploiting irregularly sampled CSI from diverse communication packets across multiple frequency bands. UniFi integrates a CSI sanitization pipeline to harmonize heterogeneous packets and remove burst-induced redundancy, together with a time-aware attention model that learns directly from non-uniform CSI sequences without resampling. We further introduce CommCSI-HAR, the first dataset with irregularly sampled CSI from real-world dual-band communication traffic. Extensive evaluations on this dataset and four public benchmarks show that UniFi achieves state-of-the-art accuracy with a compact model size, while fully preserving communication throughput.

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