Detector Based Radio Tomographic Imaging

Huseyin Yigitler*, Riku Jantti, Ossi Kaltiokallio, Neal Patwari

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review


Received signal strength based radio tomographic imaging is a popular device-free indoor localization method which reconstructs the spatial loss field of the environment using measurements from a dense wireless network. Existing methods achieve high accuracy localization using a complex system with many sophisticated components. In this work, we propose an alternative and simpler imaging system based on link level occupancy detection. First, we introduce a single-bounce reflection based received signal strength model, which allows relating received signal strength variations to a large region around the link-lines. Then, based on the model, we present methods for all system components including a classifier, a detector, a back-projection based reconstruction algorithm, and a localization method. The introduced system has the following advantages over the other imaging based methods: i) a simple image reconstruction method that is straightforward to implement; ii) significantly lower computational complexity such that no floating point multiplication is required; iii) each link's measured data are compressed to a single bit, providing improved scalability; and iv) physically significant and repeatable parameters. The proposed method is validated using measurement data. Results show that the proposed method achieves the above advantages without loss of accuracy compared to the other available methods.

Original languageEnglish
Pages (from-to)58-71
Number of pages14
JournalIEEE Transactions on Mobile Computing
Issue number1
Publication statusPublished - 1 Jan 2018
MoE publication typeA1 Journal article-refereed


  • Device-free localization
  • radio tomographic imaging
  • radio wave reflection
  • signal detection
  • received signal strength measurements
  • back-projection reconstruction

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