An FRFT-based approach to eliminate multipath interference in Radio Tomographic Imaging networks

Radio Tomographic Imaging (RTI) is a technology to locate and track targets by imaging their attenuation to radio signals in wireless networks. Links between many pairs of wireless transceivers experience shadowing losses when the signals travel through the objects, and whereby a linear model can be obtained by relating changes of received signal strength (RSS) to the location of targets in the region. However, the existing shadowing-based RTI technology does not work well in the complex environments because of multipath interference problem. Therefore, we proposed an algorithm based on fractional Fourier transform (FRFT) to estimate the line-of-sight (LOS) signals and separate them from the multipath signals. The simulation results show that our algorithm can eliminate the multipath error in RTI system greatly.