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Article: Enabling Phased Array Signal Processing for Mobile WiFi Devices

TitleEnabling Phased Array Signal Processing for Mobile WiFi Devices
Authors
Keywordsphased array calibration
Channel state information
angle of arrival
Issue Date2018
Citation
IEEE Transactions on Mobile Computing, 2018, v. 17, n. 8, p. 1820-1833 How to Cite?
AbstractModern mobile devices are equipped with multiple antennas, which brings various wireless sensing applications such as accurate localization, contactless human detection, and wireless human-device interaction. A key enabler for these applications is phased array signal processing, especially Angle of Arrival (AoA) estimation. However, accurate AoA estimation on commodity devices is non-trivial due to limited number of antennas and uncertain phase offsets. Previous works either rely on elaborate calibration or involve contrived human interactions. In this paper, we aim to enable practical AoA measurements on commodity off-the-shelf (COTS) mobile devices. The key insight is to involve users' natural rotation to formulate a virtual spatial-temporal antenna array and conduce a relative incident signal of measurements at two orientations. Then by taking the differential phase, it is feasible to remove the phase offsets and derive the accurate AoA of the equivalent incoming signal, while the rotation angle can also be captured by built-in inertial sensors. On this basis, we propose Differential MUSIC (D-MUSIC), a relative form of the standard MUSIC algorithm that eliminates the unknown phase offsets and achieves accurate AoA estimation on COTS mobile devices with only one rotation. We further extend D-MUSIC to 3-D space, integrate extra measurements during rotations for higher estimation accuracy, and fortify it in multipath-rich scenarios. We prototype D-MUSIC on commodity WiFi infrastructure and evaluate it in typical indoor environments. Experimental results demonstrate a superior performance with average AoA estimation errors of 13 with only three measurements and 5 with at most 10 measurements. Requiring no modifications or calibration, D-MUSIC is envisioned as a promising scheme for practical AoA estimation on COTS mobile devices.
Persistent Identifierhttp://hdl.handle.net/10722/303544
ISSN
2023 Impact Factor: 7.7
2023 SCImago Journal Rankings: 2.755
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorQian, Kun-
dc.contributor.authorWu, Chenshu-
dc.contributor.authorYang, Zheng-
dc.contributor.authorZhou, Zimu-
dc.contributor.authorWang, Xu-
dc.contributor.authorLiu, Yunhao-
dc.date.accessioned2021-09-15T08:25:32Z-
dc.date.available2021-09-15T08:25:32Z-
dc.date.issued2018-
dc.identifier.citationIEEE Transactions on Mobile Computing, 2018, v. 17, n. 8, p. 1820-1833-
dc.identifier.issn1536-1233-
dc.identifier.urihttp://hdl.handle.net/10722/303544-
dc.description.abstractModern mobile devices are equipped with multiple antennas, which brings various wireless sensing applications such as accurate localization, contactless human detection, and wireless human-device interaction. A key enabler for these applications is phased array signal processing, especially Angle of Arrival (AoA) estimation. However, accurate AoA estimation on commodity devices is non-trivial due to limited number of antennas and uncertain phase offsets. Previous works either rely on elaborate calibration or involve contrived human interactions. In this paper, we aim to enable practical AoA measurements on commodity off-the-shelf (COTS) mobile devices. The key insight is to involve users' natural rotation to formulate a virtual spatial-temporal antenna array and conduce a relative incident signal of measurements at two orientations. Then by taking the differential phase, it is feasible to remove the phase offsets and derive the accurate AoA of the equivalent incoming signal, while the rotation angle can also be captured by built-in inertial sensors. On this basis, we propose Differential MUSIC (D-MUSIC), a relative form of the standard MUSIC algorithm that eliminates the unknown phase offsets and achieves accurate AoA estimation on COTS mobile devices with only one rotation. We further extend D-MUSIC to 3-D space, integrate extra measurements during rotations for higher estimation accuracy, and fortify it in multipath-rich scenarios. We prototype D-MUSIC on commodity WiFi infrastructure and evaluate it in typical indoor environments. Experimental results demonstrate a superior performance with average AoA estimation errors of 13 with only three measurements and 5 with at most 10 measurements. Requiring no modifications or calibration, D-MUSIC is envisioned as a promising scheme for practical AoA estimation on COTS mobile devices.-
dc.languageeng-
dc.relation.ispartofIEEE Transactions on Mobile Computing-
dc.subjectphased array calibration-
dc.subjectChannel state information-
dc.subjectangle of arrival-
dc.titleEnabling Phased Array Signal Processing for Mobile WiFi Devices-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1109/TMC.2017.2778155-
dc.identifier.scopuseid_2-s2.0-85037633969-
dc.identifier.volume17-
dc.identifier.issue8-
dc.identifier.spage1820-
dc.identifier.epage1833-
dc.identifier.isiWOS:000437402100007-

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