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Performance Analysis of Multiuser Relay Networks with Feedback Delay
Jie YANG Xiaofei ZHANG Kai YANG
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Vol.E97A
No.8
pp.17701779 Publication Date: 2014/08/01 Online ISSN: 17451337
DOI: 10.1587/transfun.E97.A.1770 Type of Manuscript: PAPER Category: Communication Theory and Signals Keyword: AF relay network, opportunistic scheduling, beamforming, Rayleigh fading, feedback delay,
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Summary:
In this paper, we analyze the performance of a dualhop multiuser amplifyandforward (AF) relay network with the effect of the feedback delay, where the source and each of the K destinations are equipped with N_{t} and N_{r} antennas respectively, and the relay is equipped with a single antenna. In the relay network, multiantenna and multiuser diversities are guaranteed via beamforming and opportunistic scheduling, respectively. To examine the impact of delayed feedback, the new exact analytical expressions for the outage probability (OP) and symbol error rate (SER) are derived in closedform over Rayleigh fading channel, which are useful for a large number of modulation schemes. In addition, we present the asymptotic expressions for OP and SER in the high signaltonoise ratio (SNR) regime, from which we gain an insight into the system performance with deriving the diversity order and array gain. Moreover, based on the asymptotic expressions, we determine power allocation among the network nodes such that the OP is minimized. The analytical expressions are validated by MonteCarlo simulations.

