Journal ArticleDOI
802.11 with multiple antennas for dummies
Daniel Halperin,Wenjun Hu,Anmol Sheth,David Wetherall +3 more
- Vol. 40, Iss: 1, pp 19-25
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TLDR
This tutorial provides a brief introduction to multiple antenna techniques, and describes the two main classes of those techniques, spatial diversity and spatial multiplexing.Abstract:
The use of multiple antennas and MIMO techniques based on them is the key feature of 802.11n equipment that sets it apart from earlier 802.11a/g equipment. It is responsible for superior performance, reliability and range. In this tutorial, we provide a brief introduction to multiple antenna techniques. We describe the two main classes of those techniques, spatial diversity and spatial multiplexing. To ground our discussion, we explain how they work in 802.11n NICs in practice.read more
Citations
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Journal ArticleDOI
Tool release: gathering 802.11n traces with channel state information
TL;DR: 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.
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).
Proceedings ArticleDOI
Keystroke Recognition Using WiFi Signals
TL;DR: It is shown for the first time that WiFi signals can also be exploited to recognize keystrokes, which is critical for ensuring the security of computer systems and the privacy of human users as what being typed could be passwords or privacy sensitive information.
Journal ArticleDOI
Non-Invasive Detection of Moving and Stationary Human With WiFi
TL;DR: DeMan is a unified scheme for non-invasive detection of moving and stationary human on commodity WiFi devices that takes advantage of both amplitude and phase information of CSI to detect moving targets and considers human breathing as an intrinsic indicator of stationary human presence.
Journal ArticleDOI
R-TTWD: Robust Device-Free Through-The-Wall Detection of Moving Human With WiFi
TL;DR: This paper proposes a novel scheme for robust device-free TTW detection (R-TTWD) of a moving human with commodity devices that takes advantage of the correlated changes over different subcarriers and extracts the first-order difference of eigenvector of CSI across different sub carriers for TTW human detection.
References
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Journal ArticleDOI
Capacity of Multi‐antenna Gaussian Channels
TL;DR: In this paper, the authors investigate the use of multiple transmitting and/or receiving antennas for single user communications over the additive Gaussian channel with and without fading, and derive formulas for the capacities and error exponents of such channels, and describe computational procedures to evaluate such formulas.
Journal ArticleDOI
On Limits of Wireless Communications in a Fading Environment when UsingMultiple Antennas
G. J. Foschini,M. J. Gans +1 more
TL;DR: In this article, the authors examined the performance of using multi-element array (MEA) technology to improve the bit-rate of digital wireless communications and showed that with high probability extraordinary capacity is available.
Book
Fundamentals of Wireless Communication
David Tse,Pramod Viswanath +1 more
TL;DR: In this paper, the authors propose a multiuser communication architecture for point-to-point wireless networks with additive Gaussian noise detection and estimation in the context of MIMO networks.
Proceedings Article
Wireless communications
TL;DR: This book aims to provide a chronology of key events and individuals involved in the development of microelectronics technology over the past 50 years and some of the individuals involved have been identified and named.