Combined phase-difference and amplitude-comparison technique for Wi-Fi direction-finding with high angular sensitivity and ambiguity mitigation in a wide field of view
An interferometric antenna system for Wi-Fi direction finding (DF) using only two directive tilted antennas, is proposed in this work. Typically, more than two receiver chains are needed to obtain high angular sensitivity, with a distance between antennas of no more than half wavelength to avoid pha...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-06-01
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| Series: | Results in Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123025007881 |
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| Summary: | An interferometric antenna system for Wi-Fi direction finding (DF) using only two directive tilted antennas, is proposed in this work. Typically, more than two receiver chains are needed to obtain high angular sensitivity, with a distance between antennas of no more than half wavelength to avoid phase ambiguities. We demonstrate that two directive tilted antennas with a half-power beam width of 30° and separated at a distance of two wavelengths provide high angular sensitivity and mitigate the effect of the phase-difference ambiguities, thanks to the combined use of the phase- and amplitude-comparison techniques. Wi-Fi CSI (Channel State Information) and RSSI (Received Signal Strength Indicator) data are acquired to estimate the direction-of-arrival (DoA) using the proposed joint phase- and amplitude-comparison approach, demonstrating superior DF performance while avoiding complex hardware to perform active scanning or the costly use of a higher number of antennas and synchronized receivers. |
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| ISSN: | 2590-1230 |