Proceedings ArticleDOI
Walking parameters estimation through channel state information preliminary results
Saurabh Maheshwari,Anil Kumar Tiwari +1 more
- pp 1-8
TLDR
This paper has proposed a novel ubiquitous node deployment on the human body itself to minimize the environmental noise interference and trained the system to identify these signatures and deduce corresponding gait parameters.Abstract:
Stride rate and length are monitored by physicians to identify abnormalities in the patients' gait. These are also important parameters for athletes. Lab based video recordings are used for monitoring while new methods utilize inertial sensors. These sensors require a lot of sensed data processing consequently power is utilized. A new class of methods using wireless sensing has been introduced recently. These methods either require a lot of sensing nodes or are non-ubiquitous while others have used received signal strength as monitoring parameter which is quite unstable. We have proposed a novel ubiquitous node deployment on the human body itself to minimize the environmental noise interference. Walking parameters like stride rate, stride length have been estimated using wireless sensing physical layer channel state information (CSI). The human body acts as an obstacle for the wireless signals due to frequency selective multipath fading. We argue that this fading has a unique signature respective to the activity performed by humans which can be estimated using CSI. This signature should be best observed when both the sender and receiver nodes are deployed on the body due to decreased environmental interference. We have trained the system to identify these signatures and deduce corresponding gait parameters. In this paper we are only able to summarize the new idea with initial findings. We are in the process to understand the signal morphology for finer measurements.read more
Citations
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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.
Journal ArticleDOI
WiFi Sensing with Channel State Information: A Survey
TL;DR: This survey gives a comprehensive review of the signal processing techniques, algorithms, applications, and performance results of WiFi sensing with CSI, and presents three future WiFi sensing trends, i.e., integrating cross-layer network information, multi-device cooperation, and fusion of different sensors for enhancing existing WiFi sensing capabilities and enabling new WiFi sensing opportunities.
Journal ArticleDOI
WiFi Vision: Sensing, Recognition, and Detection With Commodity MIMO-OFDM WiFi
TL;DR: A survey of recent advances in WiFi vision problems, i.e., sensing, recognition, and detection by utilizing the channel state information (CSI) of the commodity WiFi devices, focuses on nine key applications of smart environments.
Journal ArticleDOI
Freezing of Gait Detection Considering Leaky Wave Cable
Xiaodong Yang,Syed Aziz Shah,Aifeng Ren,Nan Zhao,Zhi-Ya Zhang,Dou Fan,Jianxun Zhao,Weigang Wang,Masood Ur-Rehman +8 more
TL;DR: In this paper, the amplitude and phase information of the radio signals observed for a fixed period of time are used to differentiate the motor and non-motor symptoms of Parkinson's disease.
Journal ArticleDOI
Posture Recognition to Prevent Bedsores for Multiple Patients Using Leaking Coaxial Cable
TL;DR: This paper proposes a novel system using a LCX and use wireless information obtained through PHY layer wireless channel state information (CSI) to identify multiple patients' postures in bed in order to reduce the formation of pressure ulcers or bedsores on the skin.
References
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Proceedings ArticleDOI
Whole-home gesture recognition using wireless signals
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Proceedings ArticleDOI
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Proceedings ArticleDOI
See through walls with WiFi
Fadel Adib,Dina Katabi +1 more
TL;DR: This paper shows how one can track a human by treating the motion of a human body as an antenna array and tracking the resulting RF beam, and shows how to use MIMO interference nulling to eliminate reflections off static objects and focus the receiver on a moving target.
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.