Single-antenna AoA estimation with UWB radios

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“Single-antenna AoA estimation with UWB radios” by Nour Smaoui, Milad Heydariaan, and Omprakash Gnawali. In IEEE Wireless Communications and Networking Conference (WCNC 2021), Mar. 2021.


Ultra-wideband (UWB) is becoming a major local- ization technology enabler for the indoor environment. Tradi- tional localization systems rely on time-of-arrival (ToA)-based methods such as two-way ranging (TWR) and time difference of arrival (TDoA). Such solutions cannot scale due to interference from multiple devices sharing the same part of the wireless spec- trum. One solution is to use concurrent transmissions for a more efficient use of air time. Concurrency-based localization systems that utilize ToA cannot satisfy the accuracy requirements of many applications due to hardware time scheduling limitations. Angle of Arrival (AoA) is a promising solution that can provide scalability and accuracy when used in a concurrent transmission scheme. UWB radio platforms like Decawave DWM1002 with dual-UWB-chip design have made it possible to accurately measure AoA by calculating the phase difference of arrival (PDoA). State-of-the-art AoA estimation has then been extended to build self-localization systems with an unlimited number of tags and to handle multiple sources at the same time. These methods require tags with dual-chip design which adds cost and complexity. In this paper, we investigate the idea of estimating AoA on single-chip (single-antenna) tags receiving concurrent UWB signals from dual-chip anchors (intra-anchor concurrency). We call our system Single-Antenna AoA Estimation (SA-AoA). As opposed to inter-anchor concurrency, intra-anchor concurrency consists of receiving two concurrent packets from two different chips of the same anchor. By estimating AoA on single-chip tags, SA-AoA reduces the design complexity and the cost of tags by at least 50%. Our results suggest that the single-antenna AoA can achieve performance similar to dual-antenna AoA estimation.

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BibTeX entry:

   author = {Nour Smaoui and Milad Heydariaan and Omprakash Gnawali},
   title = {Single-antenna AoA estimation with UWB radios},
   booktitle = {IEEE Wireless Communications and Networking Conference
	(WCNC 2021)},
   month = mar,
   year = {2021}