NDLI: Cooperative beamforming in Cognitive Radio networks

Content Provider	IEEE Xplore Digital Library
Author	Beigi, M.A. Razavizadeh, S.M.
Copyright Year	2009
Description	Author affiliation: Communication Technology Institute, Iran Telecommunication Research Center, Tehran, Iran (Beigi, M.A.; Razavizadeh, S.M.)
Abstract	In this paper, the problem of cooperative beamforming is investigated in a heterogeneous underlay cognitive network. A major difference exists between a conventional cooperative beamforming problem and cooperative beamforming in a CR (Cognitive Radio)network due to the interference constraints imposed by primary network. These constraints can greatly icrease the complexity of the related optimization problem and make it much more challenging. Here, we have assumed a typical CR network where a set of cognitive relay nodes collaboratively assist the secondary transmitter to relay its message signal to the destination in the presence of a primary transmitter-receiver pair. Each relay employs the Amplify-and-Forward (AF) protocol to retransmit the signal. In fact, the relays comprise a distributed beamformer to beamform the signal towards its destination while maintaining the QoS in the primary user. The objective is designing the beamformer in order to maximize the target SINR in the cognitive network subject to the network power limitations and interference constraints on the primary network. First, the cooperative beamforming problem has been solved and the improved performance in terms of target SINR in the secondary network has been investigated by simulations. Secondly, a parameter has been derived to demonstrate the distance between the optimal beamweights in this problem and the beamweights in a conventional beamforming problem. Simulations show that the target SINR can be dramatically increased by using cooperative beamforming. Moreover, they show that there is a great distinction between the optimal solutions in conventional cooperative beamforming and cooperative beamforming in cognitive radios.
Starting Page	1
Ending Page	5
File Size	3020091
Page Count	5
File Format	PDF
ISBN	9781424456604
e-ISBN	9781424456611
e-ISBN	9781424456628
DOI	10.1109/WD.2009.5449675
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-12-15
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Constraint optimization Protocols Array signal processing Radio transmitters Collaboration Chromium Cognitive radio Relays Interference constraints Signal to noise ratio
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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