NDLI: Testing zero-feedback distributed beamforming with a low-cost SDR testbed

Content Provider	IEEE Xplore Digital Library
Author	Sklivanitis, G. Bletsas, A.
Copyright Year	2011
Description	Author affiliation: Department of Electronic & Computer Engineering, Technical University of Crete, Chania, Greece 73100 (Sklivanitis, G.; Bletsas, A.)
Abstract	Collaborative beamforming from distributed wireless transmitters has been envisioned as a means for range extension/connectivity enhancement if the signals transmitted from distributed terminals constructively add (i.e. in phase) at the destination receiver. The research community has mainly relied on feedback schemes from the final receiver towards the distributed transmitters, either in the form of pilot signals or explicit messages that coordinate the distributed transmissions and alleviate, to an extent, the frequency and time synchronization problems. This work assumes zero-feedback from destination towards the distributed transmitters, in sharp contrast to prior art. The frequency offsets among the distributed transmitters, typically undesired in classic beamforming schemes, are turned into an advantage and offer beamforming gains through signal alignment, i.e. when the transmitted signal-phasors align in time. The idea is validated in a custom, low-cost testbed, consisting of three embedded commodity radio transmitters with highly inaccurate, internal oscillators and a software-defined radio (SDR) receiver. This collaborative beamforming demonstration, perhaps the first of its kind on zero-feedback from the final destination, could potentially spark interest on relevant critical applications with ultra low complexity portable radios such as in emergency radio.
Starting Page	104
Ending Page	108
File Size	578040
Page Count	5
File Format	PDF
ISBN	9781467303217
ISSN	10586393
e-ISBN	9781467303231
DOI	10.1109/ACSSC.2011.6189964
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-11-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Array signal processing Radio transmitters Receivers Synchronization Collaboration Signal to noise ratio Frequency synchronization
Content Type	Text
Resource Type	Article
Subject	Signal Processing Computer Networks and Communications

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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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7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
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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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