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dc.contributor.authorKu, Meng-Linen_US
dc.contributor.authorWang, Li-Chunen_US
dc.contributor.authorSu, Yu T.en_US
dc.date.accessioned2014-12-08T15:28:14Z-
dc.date.available2014-12-08T15:28:14Z-
dc.date.issued2012-10-01en_US
dc.identifier.issn0090-6778en_US
dc.identifier.urihttp://dx.doi.org/10.1109/TCOMM.2012.081012.100728en_US
dc.identifier.urihttp://hdl.handle.net/11536/20453-
dc.description.abstractIn this paper, we present a joint antenna beamforming and power allocation technique to maximize the multiuser sum rate in an underlying microcellular system which reuses the same spectrum of a macrocellular system. One challenge in this kind of hierarchical cognitive radio (HCR) systems is to manage the interference between the macrocell and the microcell. The key contribution of this paper is to develop an optimization technique for antenna beamforming that can maximize the achievable sum rate of the underlying cognitive radio (CR) microcellular system and control the interference between the macrocell and the microcell with a satisfaction level. The proposed technique optimizes the sum rate performance by maximizing its lower bound and transfers the original non-convex problem into a convex optimization problem by introducing auxiliary variables to confine the intra-user interference power among the secondary system. Next, an iterative sum rate maximization (ISM) algorithm is developed to find the beamforming weights and the allocated power for each secondary user to simultaneously maximize system sum rate, coverage, and concurrent multiuser transmission probability in the HCR system. The developed joint design methodology provides valuable insights into the design of an optimal HCR system for various numbers of users as well as cell coverage, and can quantitatively optimize the performance tradeoffs in the hierarchical multiuser CR systems for current and future wireless communication applications.en_US
dc.language.isoen_USen_US
dc.subjectHierarchical cognitive radioen_US
dc.subjectmultiuser beamformingen_US
dc.subjectpower allocationen_US
dc.subjectconvex optimizationen_US
dc.titleToward Optimal Multiuser Antenna Beamforming for Hierarchical Cognitive Radio Systemsen_US
dc.typeArticleen_US
dc.identifier.doi10.1109/TCOMM.2012.081012.100728en_US
dc.identifier.journalIEEE TRANSACTIONS ON COMMUNICATIONSen_US
dc.citation.volume60en_US
dc.citation.issue10en_US
dc.citation.spage2872en_US
dc.citation.epage2885en_US
dc.contributor.department電機資訊學士班zh_TW
dc.contributor.departmentUndergraduate Honors Program of Electrical Engineering and Computer Scienceen_US
dc.identifier.wosnumberWOS:000310195700013-
dc.citation.woscount4-
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