Joint beamforming and scheduling in the downlink of cognitive radio networks |
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Authors: | Wei Xi ChangChuan Yin GuangXin Yue |
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Affiliation: | (1) University of Nebraska-Lincoln, Omaha, NE, USA;(2) College of Engineering, University of Nebraska-Lincoln, Omaha, NE, USA;(3) Beijing University of Posts and Telecommunications, Beijing, China;(4) Defense R&D Canada, Ottawa, ON, Canada |
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Abstract: | Cognitive radio has been recently proposed as a promising technology to improve the spectrum utilization. In this paper, we
consider a system where a licensed radio spectrum is shared by a primary network and a secondary network. Based on the subspace
theory, a novel low-complexity algorithm for secondary user selection has been proposed. On the basis of the scheduling scheme,
we jointly consider transmit beamforming, scheduling and power allocation, and subsequently present a complete set of solution
for secondary network downlink. Simulation results has shown that our proposed scheme not only can limit the introduced interference
at primary users within the tolerable range, but also can achieve high sum-rate throughput of secondary network, simultaneously.
Furthermore, as is proved by simulation results, our scheme is very robust due to the fact that only a little tolerable performance
drop is introduced when simple but nonoptimal equal power allocation is adopted. |
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Keywords: | cognitive radio multiple-input multiple-output (MIMO) beamforming multiuser diversity power allocation water filling |
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