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.
read more
Abstract: The spatial features of emitted wireless signals are the basis of location distinction and determination for wireless indoor localization. Available in mainstream wireless signal measurements, the Received Signal Strength Indicator (RSSI) has been adopted in vast indoor localization systems. However, it suffers from dramatic performance degradation in complex situations due to multipath fading and temporal dynamics.Break-through techniques resort to finer-grained wireless channel measurement than RSSI. Different from RSSI, the PHY layer power feature, channel response, is able to discriminate multipath characteristics, and thus holds the potential for the convergence of accurate and pervasive indoor localization. Channel State Information (CSI, reflecting channel response in 802.11 a/g/n) has attracted many research efforts and some pioneer works have demonstrated submeter or even centimeter-level accuracy. In this article, we survey this new trend of channel response in localization. The differences between CSI and RSSI are highlighted with respect to network layering, time resolution, frequency resolution, stability, and accessibility. Furthermore, we investigate a large body of recent works and classify them overall into three categories according to how to use CSI. For each category, we emphasize the basic principles and address future directions of research in this new and largely open area.
read more
Chat with Paper
AI Agents for this Paper
Find similar papers on Google Scholar, PubMed and Arxiv
Write a critical review of this paper
Analyze citations of this paper to find unaddressed research gaps
Citations
LightSeg: An Online and Low-Latency Activity Segmentation Method for Wi-Fi Sensing
Liming Chen,Xiaolong Zheng,Leiyang Xu,Liang Liu,Huadong Ma +4 more
- 01 Jan 2023
TL;DR: LightSeg as mentioned in this paper proposes a threshold post-decision mechanism that detects the end of a segment first and then decides the appropriate threshold based on the most recent activity, which greatly reduces the dependence on expertise to decide the threshold.
Channel State Information (CSI) Amplitude Coloring Scheme for Enhancing Accuracy of an Indoor Occupancy Detection System Using Wi-Fi Sensing
J. Son,Jaesung Park +1 more
TL;DR: A novel CSI amplitude coloring scheme enhances indoor occupancy detection via Wi-Fi sensing by amplifying subtle differences in CSI data, improving people-counting accuracy through a CNN-based approach, and ensuring temporal consistency in diverse real-world scenarios.
OSLo: Optical Sensor Localization through Mesh Networked Cameras
Hassaan Janjua,Fan Yang,Mahmoud Ammar,David Newton,Seonhi Ro,Sam Michiels,Danny Hughes +6 more
- 07 Jun 2021
TL;DR: In this paper, a meshed network of low-cost cameras as localization anchors and smart LEDs as tags, which transmit their IDs and context sensor data over the meshed cameras using optical communication.
A Convolutional Neural Network Based Device-Free Indoor Localization Using CSI
Md. Arif Rahman,Abu M. Fuad,Tahsina Farah Sanam +2 more
- 16 Oct 2023
TL;DR: A CSI-based device-free indoor localization system using a machine learning-based classification approach achieves high accuracy by exploiting variations in wireless signals reflected from objects in the environment.
References
•Book
Wireless Communications: Principles and Practice
Theodore S. Rappaport
- 15 Jan 1996
TL;DR: WireWireless Communications: Principles and Practice, Second Edition is the definitive modern text for wireless communications technology and system design as discussed by the authors, which covers the fundamental issues impacting all wireless networks and reviews virtually every important new wireless standard and technological development, offering especially comprehensive coverage of the 3G systems and wireless local area networks (WLANs).
20K
RADAR: an in-building RF-based user location and tracking system
Paramvir Bahl,Venkata N. Padmanabhan +1 more
- 26 Mar 2000
TL;DR: RADAR is presented, a radio-frequency (RF)-based system for locating and tracking users inside buildings that combines empirical measurements with signal propagation modeling to determine user location and thereby enable location-aware services and applications.
Wireless Communications: List of Abbreviations
Andrea Goldsmith
- 01 Jan 2005
TL;DR: The field of wireless communications has been in existence since the first humans learned to communicate.
9.2K
The Earth Mover's Distance as a Metric for Image Retrieval
TL;DR: This paper investigates the properties of a metric between two distributions, the Earth Mover's Distance (EMD), for content-based image retrieval, and compares the retrieval performance of the EMD with that of other distances.
The active badge location system
TL;DR: A novel system for the location of people in an office environment is described, where members of staff wear badges that transmit signals providing information about their location to a centralized location service, through a network of sensors.
Related Papers (5)
Paramvir Bahl,Venkata N. Padmanabhan +1 more
- 26 Mar 2000
Manikanta Kotaru,Kiran Joshi,Dinesh Bharadia,Sachin Katti +3 more
- 17 Aug 2015