TR2025-115

Multi-Band Wi-Fi Neural Dynamic Fusion


Abstract:

Wi-Fi channel measurements across different bands, e.g., sub-7-GHz and 60-GHz bands, are asynchronous due to the uncoordinated nature of distinct standards protocols, e.g., 802.11ac/ax/be and 802.11ad/ay. Multi-band Wi-Fi fusion has been considered before on a frame-to-frame basis for simple classification tasks, which does not require fine-time-scale alignment. In contrast, this paper considers asynchronous sequence- to-sequence fusion between sub-7-GHz channel state information (CSI) and 60-GHz beam signal-to-noise-ratio (SNR)s for more challenging tasks, such as continuous coordinate estimation. To handle the timing disparity between asynchronous multi-band Wi-Fi channel measurements, this paper proposes a multi-band neural dynamic fusion (NDF) framework. This framework uses separate encoders to embed the multi-band Wi-Fi measurement sequences to separate initial latent conditions. Using a continuous-time ordinary differential equation (ODE) modeling, these initial latent conditions are propagated to the respective latent states of the multi-band channel measurements at the same time instances for a latent alignment and a post-ODE fusion, and at their original time instances for measurement reconstruction. We derive a customized loss function based on the variational evidence lower bound (ELBO) that balances between the multi-band measurement reconstruction and continuous co- ordinate estimation. We evaluate the NDF framework using an in-house multi-band Wi-Fi testbed and demonstrate substantial performance improvements over a comprehensive list of single- band and multi-band baseline methods.

 

  • Related Publication

  •  Kato, S., Wang, P., Koike-Akino, T., Fujihashi, T., Mansour, H., Boufounos, P.T., "Multi-Band Wi-Fi Neural Dynamic Fusion", arXiv, July 2024.
    BibTeX arXiv
    • @article{Kato2024jul,
    • author = {Kato, Sorachi and Wang, Pu and Koike-Akino, Toshiaki and Fujihashi, Takuya and Mansour, Hassan and Boufounos, Petros T.},
    • title = {{Multi-Band Wi-Fi Neural Dynamic Fusion}},
    • journal = {arXiv},
    • year = 2024,
    • month = jul,
    • url = {https://arxiv.org/abs/2407.12937}
    • }