Title: AoD-based Positioning for Wi-Fi OFDM Receivers
Author(s): Nir Dvorecki, Ofer Bar-Shalom, and Yuval Amizur
Published in: Proceedings of the 30th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2017)
September 25 - 29, 2017
Oregon Convention Center
Portland, Oregon
Pages: 2883 - 2893
Cite this article: Dvorecki, Nir, Bar-Shalom, Ofer, Amizur, Yuval, "AoD-based Positioning for Wi-Fi OFDM Receivers," Proceedings of the 30th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2017), Portland, Oregon, September 2017, pp. 2883-2893.
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Abstract: Wi-Fi client self-positioning based on estimated azimuth and elevation angles of departure (AoD), is presented. The devised method takes advantage of the Wi-Fi OFDM symbol structure, and enables an unlimited number of (single-antenna) Wi-Fi client stations operating simultaneously, to obtain a simple and direct estimate of the transmitted signal AoD. Unlike other AoD positioning methods, the method outlined eliminates the client’s need to estimate any signal phase differences. The transmitter applies different beamforming to the modulating signal of each OFDM tone, thereby effectively steering its array beam to a different direction for each tone. Furthermore, the burden of calibrating and compensating for the transmitter’s array spatial response is undertaken by the transmitter itself. The following paper formulates the problem and outlines the beamforming criteria, for which numerical performance analysis results are presented.