NDLI: Realizing high performance multi-radio 802.11n wireless networks

Content Provider	IEEE Xplore Digital Library
Author	Lakshmanan, S. Jeongkeun Lee Etkin, R. Sung-Ju Lee Sivakumar, R.
Copyright Year	2011
Description	Author affiliation: School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA (Lakshmanan, S.; Sivakumar, R.) \|\| Hewlett-Packard Laboratories, Palo Alto, CA, USA (Jeongkeun Lee; Etkin, R.; Sung-Ju Lee)
Abstract	We explore the design of a high capacity multi-radio wireless network using commercial 802.11n hardware. We first use extensive real-life experiments to evaluate the performance of closely located 802.11n radios. We discover that even when tuned to orthogonal channels, co-located 802.11n radios interfere with each other and achieve significantly less throughput than expected. Our analysis reveals that the throughput degradation is caused by three link-layer effects: (i) triggering of carrier sensing, (ii) out of band collisions and (iii) unintended frequency adaptation. Using physical layer statistics, we observe that these effects are caused by fundamental limitations of co-located radios in achieving signal isolation. We then consider the use of beamforming antennas, shielding and antenna separation distance to achieve better signal isolation and to mitigate these problems. Our work profiles the gains of different physical isolation approaches and provides insights to network designers to realize high-performance wireless networks without requiring synchronization or protocol modifications.
Starting Page	242
Ending Page	250
File Size	683179
Page Count	9
File Format	PDF
ISBN	9781457700941
ISSN	21555494
e-ISBN	9781457700934
DOI	10.1109/SAHCN.2011.5984904
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-27
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Throughput IEEE 802.11n Standard Degradation Radar Receivers Interference
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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