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On the utilization of MIMO-OFDM channel sparsity for accurate positioning

Saloranta, Jani; Destino, Giuseppe (2016-12-01)

 
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URL:
https://doi.org/10.1109/EUSIPCO.2016.7760348

Saloranta, Jani
Destino, Giuseppe
Institute of Electrical and Electronics Engineers
01.12.2016

J. Saloranta and G. Destino, "On the utilization of MIMO-OFDM channel sparsity for accurate positioning," 2016 24th European Signal Processing Conference (EUSIPCO), Budapest, 2016, pp. 748-752. doi: 10.1109/EUSIPCO.2016.7760348

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doi:https://doi.org/10.1109/EUSIPCO.2016.7760348
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https://urn.fi/URN:NBN:fi-fe2018052124291
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Abstract

Recent results have revealed that MIMO channels at high carrier frequencies exhibit sparsity structure, i.e., a few dominant propagation paths. Also channel parameters, namely angular information and propagation delay can be modelled with the physical location of the transmitter, receiver and scatters. In this paper, we leverage these features into the development of a single base-station localization algorithm, and show that the location of an unknown device can be estimated with an accuracy below a meter based on pilot signalling with a OFDM transmission. The method relies on the utilization of the “Adaptive-LASSO” optimization method, in which an ℓ1-based minimization problem is solved by adapting the sparsifying matrix (dictionary) and the sparse vector jointly. Then the location of the device is estimated from the parameters of the sparsifying matrix. Finally, the positioning method is evaluated in different channel setting utilizing a ray-tracing channel model at 28GHz.

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