RSSI-Based Localization Using Wireless Beacon with Three-Element Array

Ryota TAZAWA  Naoki HONMA  Atsushi MIURA  Hiroto MINAMIZAWA  

IEICE TRANSACTIONS on Communications   Vol.E101-B   No.2   pp.400-408
Publication Date: 2018/02/01
Publicized: 2017/08/22
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2017ISP0027
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2016)
Category: DOA Estimation
RSSI,  wireless beacon,  DOD estimation,  localization,  

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In this paper, we propose an indoor localization method that uses only the Received Signal Strength Indicator (RSSI) of signals transmitted from wireless beacons. The beacons use three-element array antennas, and the position of the receiving terminal is estimated by using multiple DOD information. Each beacon transmits four beacon signals with different directivities by feeding signals to the three-element array antennas via 180-degree and 90-degree hybrids. The correlation matrix of the propagation channels is estimated from just the strength of the signals, and the DOD is estimated from the calculated correlation matrix. For determining the location of the receiving terminal, the existence probability function is introduced. Experiments show that the proposed method attains lower position estimation error than the conventional method.