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Robust Collaborativ...
Robust Collaborative-Relay Beamforming
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- Zheng, Gan (author)
- Department of Electrical and Electronic Engineering, University College London
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- Wong, Kai-Kit (author)
- Department of Electrical and Electronic Engineering, University College London
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- Paulraj, Arogyasvsami (author)
- Information Systems Laboratory, Stanford University, US
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- Ottersten, Björn, 1961- (author)
- KTH,Signalbehandling,ACCESS Linnaeus Centre
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(creator_code:org_t)
- IEEE, 2009
- 2009
- English.
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In: IEEE Transactions on Signal Processing. - : IEEE. - 1053-587X .- 1941-0476. ; 57:8, s. 3130-3143
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Relay communications is a promising technique to extend the range of wireless communications by forwarding the message from the sender to the intended destination. While fixed or variable-power relays have been previously investigated, this paper addresses the collaborative use of variable-phase variable-power amplify-and-forward (AF) relays for robust beamforming, with the aid of imperfect channel state information (CSI) at the sender. In particular, the maximization of the worst-case signal-to-noise ratio (SNR) at the destination terminal is studied under a bounded spherical region for the norm of the CSI error vector from the relays to the destination. Our main contribution is that we prove, under a condition on the quality of the estimated CSI, the robust-optimal collaborative-relay beamforming (CRBF) can be obtained by S-Procedure and rank relaxation techniques. In addition, a distributed algorithm is developed by examining the structure of the optimal CRBF solution. Results demonstrate a significant gain of CRBF over non-robust approaches.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Telekommunikation (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Telecommunications (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Kommunikationssystem (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Communication Systems (hsv//eng)
Keyword
- Collaborative beamforming
- MIMO
- relay
- user cooperation diversity
- optimal power allocation
- wireless
- networks
- optimization
- mimo
- constraints
- information
- capacity
- channel
- protocols
Publication and Content Type
- ref (subject category)
- art (subject category)
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