Proceedings ArticleDOI
Using WLAN Infrastructure for Angle-of-Arrival Indoor User Location
Carl M. Wong,Richard Klukas,Geoffrey G. Messier +2 more
- pp 1-5
TLDR
Investigation of the potential for future multiple antenna wireless local area network technologies such as 802.11n to perform indoor network-based positioning using angle of arrival (AOA) estimation shows that with the use of a specialized channel parameter estimation algorithm, quality AOA estimates for positioning might be achieved with low computational complexity.Abstract:Â
This paper investigates the potential for future multiple antenna wireless local area network technologies such as 802.11n to perform indoor network-based positioning using angle of arrival (AOA) estimation. A multiple-input multiple-output (MIMO) channel measurement system is used to determine the statistical accuracy of the indoor AOA estimation when performed at an 802.11n wireless access point (AP). Two different channel parameter estimation algorithms are used to perform AOA estimation; a simple maximum-likelihood (ML) scheme and the space-alternating generalized expectation-maximization (SAGE) technique. Results indicate that general channel parameter estimation algorithms, such as SAGE, are ill suited to estimate AOA for positioning purposes. However, results show that with the use of a specialized channel parameter estimation algorithm, such as the simple ML algorithm, quality AOA estimates for positioning might be achieved with low computational complexity. A positioning simulation that incorporates the AOA estimates from the simple ML algorithm achieves a positioning accuracy of 1.7 m with the help of an extended Kalman filter.read more
Citations
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Journal ArticleDOI
From RSSI to CSI: Indoor localization via channel response
Zheng Yang,Zimu Zhou,Yunhao Liu +2 more
TL;DR: In this article, the authors survey the channel state information (CSI) in 802.11 a/g/n and highlight the differences between CSI and RSSI with respect to network layering, time resolution, frequency resolution, stability, and accessibility.
ArrayTrack: A Fine-Grained Indoor Location System
Jie Xiong,Kyle Jamieson +1 more
TL;DR: The design and experimental evaluation of ArrayTrack is presented, an indoor location system that uses MIMO-based techniques to track wireless clients at a very fine granularity in real time, as they roam about a building, making for the first time ubiquitous real-time, fine-grained location available on the mobile handset.
Proceedings Article
ArrayTrack: a fine-grained indoor location system
Jie Xiong,Kyle Jamieson +1 more
TL;DR: In this paper, the authors present an indoor location system that uses MIMO-based techniques to track wireless clients at a very fine granularity in real time, as they roam about a building.
From RSSI to CSI: Indoor Localization via Channel Response, A survey on indoor localization using PHY-layer information
Yang Zheng,Zhou Zimu,Yunhao Liu +2 more
TL;DR: This article surveys the new trend of channel response in localization and investigates a large body of recent works and classify them overall into three categories according to how to use CSI, highlighting the differences between CSI and RSSI.
Book
Indoor Positioning Technologies
TL;DR: This work aims to provide arobust, scalable, scalable and scalable approach to Indoor Positioning that combines 3D Building Modeling, 3D Targeting, and 3D Sensors into a single system.
References
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Journal ArticleDOI
Space-alternating generalized expectation-maximization algorithm
TL;DR: The paper describes the space-alternating generalized EM (SAGE) method, which updates the parameters sequentially by alternating between several small hidden-data spaces defined by the algorithm designer, and proves that the sequence of estimates monotonically increases the penalized-likelihood objective, derive asymptotic convergence rates, and provide sufficient conditions for monotone convergence in norm.
Journal ArticleDOI
Channel parameter estimation in mobile radio environments using the SAGE algorithm
TL;DR: The investigations demonstrate that the SAGE algorithm is a powerful high-resolution tool that can be successfully applied for parameter extraction from extensive channel measurement data, especially for the purpose of channel modeling.
Journal ArticleDOI
Kernel-Based Positioning in Wireless Local Area Networks
TL;DR: It is shown that, due to the variability of RSS features over space, a spatially localized positioning method leads to improved positioning results and a kernelized distance calculation algorithm for comparing RSS observations to RSS training records is presented.
Journal ArticleDOI
Sensor Measurements for Wi-Fi Location with Emphasis on Time-of-Arrival Ranging
S.A. Golden,S.S. Bateman +1 more
TL;DR: A novel time of arrival (TOA) approach that Intel research has developed can deliver significant performance improvements over signal-strength-based measurements, as shown in this paper.
Journal ArticleDOI
Wireless LAN Comes of Age: Understanding the IEEE 802.11n Amendment
Thomas Paul,Tokunbo Ogunfunmi +1 more
TL;DR: An exposition on the techniques used in IEEE 802.11n to achieve improvements to throughput and range, and a discussion of the future for 11n, describing the issues addressed with Drafts 2.0 and 3.0, as well as its place in a wireless market with WiMAX and Bluetooth.