Title :
Inverse Beamforming for Radio Tomography
Author :
Martin, Richard K.
Author_Institution :
Dept. of Electr. & Comput. Eng., Air Force Inst. of Technol. (AFIT), Wright-Patterson AFB, OH, USA
Abstract :
Radio tomography is a method for imaging a small scene by measuring the attenuation by objects of all links in a dense wireless sensor network. Multipath reduces the amount of attenuation a user induces on the links, corrupting the image. This paper introduces a beamforming method that does not induce latency in the image frame rate yet allows beamforming using transmit and receive weights on every link. Simulations demonstrate that the beamformer can successfully mitigate multipath, restoring the image to a nearly multipath-free quality.
Keywords :
array signal processing; radiofrequency imaging; tomography; wireless sensor networks; attenuation measurement; dense wireless sensor network; image frame rate; inverse beamforming method; multipath mitigation; multipath-free quality; radio tomography; receive weights; small scene imaging; transmit weights; Array signal processing; Arrays; Attenuation; Receiving antennas; Tomography; Transmitting antennas; Inverse beamforming; MIMO; radio tomography; received signal strength;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2014.2353216
