Decentralized Beamformer Design with Limited Multi-Cell Cooperation for Interference Channel of Cognitive Radio Networks
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- Title
- Decentralized Beamformer Design with Limited Multi-Cell Cooperation for Interference Channel of Cognitive Radio Networks
- Authors
- Kim, YJ; Song, MG; Cho, YS; Im, GH
- Date Issued
- 2013-08
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Abstract
- In spectrum-sharing-based cognitive radio networks, multiple secondary systems can access a licensed spectrum to better utilize scarce radio resources. When the multiple secondary transmitters are co-located, the weighted sum-rate of the secondary users (SUs) is mainly limited by the inter-cell interference (ICI). With limited cooperation among co-located secondary transmitters, we propose an algorithm for decentralized beamforming with power allocation via dual decomposition. To maximize the weighted sum-rate of the SUs, the proposed decentralized algorithm efficiently mitigates the ICI by the undesired leakage power limitation at each secondary transmitter. Because the channel information is not perfectly known at the transmitter in practical applications, we also develop a decentralized robust beamformer. To efficiently design the robust beamformer, a convex problem is formulated by semi-definite relaxation. Simulation results show that the proposed algorithm with perfect channel state information (P-CSI) efficiently maximizes the weighted sum-rate performance by the undesired leakage power limitation. For an imperfect CSI with a small error bound, the proposed robust beamformer approaches the performance of a P-CSI case, without causing harmful interference to the primary user.
- Keywords
- Cognitive radio; spectrum sharing; multiple antenna; weighted sum-rate maximization; limited cooperation; ITERATIVE MULTIUSER DETECTION; RESOURCE-ALLOCATION; MIMO; OPTIMIZATION
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/15028
- DOI
- 10.1109/TWC.2013.071913.121996
- ISSN
- 1536-1276
- Article Type
- Article
- Citation
- IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, vol. 12, no. 8, page. 4142 - 4152, 2013-08
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