NDLI: Robust relay design for two-way multi-antenna relay systems with imperfect CSI

Content Provider	IEEE Xplore Digital Library
Author	Chenyuan Wang Xiaodai Dong Yi Shi
Copyright Year	2011
Abstract	The paper investigates the problem of designing the multiple-antenna relay in a two-way relay network by taking into account the imperfect channel state information (CSI). The objective is to design the multiple-antenna relay based upon the CSI estimates, where the estimation errors are included to attain the robust design under the worst-case philosophy. In particular, the worst-case transmit power at the multiple-antenna relay is minimized while guaranteeing the worst-case quality of service requirements that the received signal-to-noise ratio (SNR) at both sources are above a prescribed threshold value. Since the worst-case received SNR expression is too complex for subsequent derivation and processing, its lower bound is explored instead by minimizing the numerator and maximizing the denominator of the worst-case SNR. The aforementioned problem is mathematically formulated and shown to be nonconvex. This motivates the pursuit of semidefinite relaxation coupled with a randomization technique to obtain computationally efficient high-quality approximate solutions. This paper has shown that the original optimization problem can be reformulated and then relaxed to a convex problem that can be solved by utilizing suitable randomization loop. Numerical results compare the proposed multiple-antenna relay with the existing non-robust method, and therefore validate its robustness against the channel uncertainty. Finally, the feasibility of the proposed design and the associated influencing factors are discussed by means of extensive Monte Carlo simulations.
Starting Page	45
Ending Page	55
Page Count	11
File Size	700518
File Format	PDF
ISSN	12292370
Volume Number	16
Issue Number	1
Language	English
Publisher	Editorial Department of Journal of Communications and Networks
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	JCN
Subject Keyword	Relays Robustness Channel estimation Signal to noise ratio Uncertainty Gaussian processes Estimation error worst-case robust design Gaussian randomization imperfect channel state information (CSI) semidefìnite relaxation two-way relay network
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications Information Systems

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