Abstract
Wireless tomography is a technique for inferring a physical environment within a monitored region by analyzing RF signals traversed across the region. In this paper, we consider wireless tomography in a two and higher dimensionally structured monitored region, and propose a multi-dimensional wireless tomography scheme based on compressed sensing to estimate a spatial distribution of shadowing loss in the monitored region. In order to estimate the spatial distribution, we consider two compressed sensing frameworks: vector-based compressed sensing and tensor-based compressed sensing. When the shadowing loss has a high spatial correlation in the monitored region, the spatial distribution has a sparsity in its frequency domain. Existing wireless tomography schemes are based on the vector-based compressed sensing and estimates the distribution by utilizing the sparsity. On the other hand, the proposed scheme is based on the tensor-based compressed sensing, which estimates the distribution by utilizing its low-rank property. With simulation experiments, we reveal that the tensor-based compressed sensing has a potential for highly accurate estimation as compared with the vector-based compressed sensing. In order to show the possibility of the wireless tomography schemes in practical environments, we also show an experimental result in an anechoic chamber.
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Notes
\(s_n\) (\(n = 1, 2, \ldots , N\)) can be defined over complex number field \(\mathcal {C}\) when \(\varvec{\varPhi }\) is defined by a complex number matrix such as an inverse Fourier transform matrix. In this paper, however, we define \(s_n\) as a real number by using an inverse DCT (Discrete Cosine Transform) matrix in order to simplify the description.
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This paper is presented in part at arXiv:1407.2394 [18] and the 18th International Symposium on Wireless Personal Multimedia Communications (WPMC 2015) [22]. This work was supported in part by the R&D on “Cooperative Technologies and Frequency Sharing Between Unmanned Aircraft Systems (UAS) Based Wireless Relay Systems and Terrestrial Networks” by the Ministry of Internal Affairs and Communications of Japan, and the Grant-in-Aid for Scientific Researches (Nos. 25289115, JP16K14270, and JP16K00124) from the Ministry of Education, Science, Sport and Culture of Japan.
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Matsuda, T., Yokota, K., Takemoto, K. et al. Multi-Dimensional Wireless Tomography Using Tensor-Based Compressed Sensing. Wireless Pers Commun 96, 3361–3384 (2017). https://doi.org/10.1007/s11277-017-4061-2
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DOI: https://doi.org/10.1007/s11277-017-4061-2