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Journal ArticleDOI

Tool release: gathering 802.11n traces with channel state information

TLDR
The measurement setup comprises the customized versions of Intel's close-source firmware and open-source iwlwifi wireless driver, userspace tools to enable these measurements, access point functionality for controlling both ends of the link, and Matlab scripts for data analysis.
Abstract
We are pleased to announce the release of a tool that records detailed measurements of the wireless channel along with received 802.11 packet traces. It runs on a commodity 802.11n NIC, and records Channel State Information (CSI) based on the 802.11 standard. Unlike Receive Signal Strength Indicator (RSSI) values, which merely capture the total power received at the listener, the CSI contains information about the channel between sender and receiver at the level of individual data subcarriers, for each pair of transmit and receive antennas.Our toolkit uses the Intel WiFi Link 5300 wireless NIC with 3 antennas. It works on up-to-date Linux operating systems: in our testbed we use Ubuntu 10.04 LTS with the 2.6.36 kernel. The measurement setup comprises our customized versions of Intel's close-source firmware and open-source iwlwifi wireless driver, userspace tools to enable these measurements, access point functionality for controlling both ends of the link, and Matlab (or Octave) scripts for data analysis. We are releasing the binary of the modified firmware, and the source code to all the other components.

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Citations
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Proceedings ArticleDOI

RSSI-based Methods for LOS/NLOS Channel Identification in Indoor Scenarios

TL;DR: The results show that simple threshold-based classification criteria on the considered statistical features may yield approximately 85÷90% LOS/NLOS classification accuracy, making them an attractive strategy for future 5G systems.
Proceedings ArticleDOI

Calibrating Time-variant, Device-specific Phase Noise for COTS WiFi Devices

TL;DR: This paper proposes an effective phase noise calibration technique which can be broadly applicable to COTS WiFi based motion sensing and experiments with a prototype system that can track hand gestures in a non-intrusive manner.
Proceedings ArticleDOI

Indoor Localization Using Commodity Wi-Fi APs: Techniques and Challenges

TL;DR: This survey is to review the most recent works on WiFi based localization systems that use commodity hardware highlighting their strengths and limitations, investigating major technical challenges, and outlining opportunities for future research.
Proceedings ArticleDOI

ORION: Orientation estimation using commodity Wi-Fi

TL;DR: This work proposes the ORION system to estimate the orientation (heading and yaw) of a MIMO Wi-Fi equipped object, relying on a joint estimation of the angle of arrival and the angles of departure, and demonstrates that an appropriate phase compensation strategy significantly improves estimation accuracy.
Journal ArticleDOI

Revisiting Indoor Intrusion Detection With WiFi Signals: Do Not Panic Over a Pet!

TL;DR: PetFree proposes a novel CSI-EIH model to characterize the relationship between CSI measurements and the EIH of the target, and achieves accurate pet identification using only a single WiFi link, significantly outperforming the state-of-the-art approach.
References
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Proceedings ArticleDOI

Predictable 802.11 packet delivery from wireless channel measurements

TL;DR: It is shown that, for the first time, wireless packet delivery can be accurately predicted for commodity 802.11 NICs from only the channel measurements that they provide, and the rate prediction is as good as the best rate adaptation algorithms for 802.
Journal ArticleDOI

ACM SIGCOMM computer communication review

TL;DR: The Internet is going mobile and wireless, perhaps quite soon, with a number of diverse technologies leading the charge, including, 3G cellular networks based on CDMA technology, a wide variety of what is deemed 2.5G cellular technologies (e.g., EDGE, GPRS and HDR), and IEEE 802.11 wireless local area networks (WLANs).
Journal ArticleDOI

802.11 with multiple antennas for dummies

TL;DR: This tutorial provides a brief introduction to multiple antenna techniques, and describes the two main classes of those techniques, spatial diversity and spatial multiplexing.
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