NDLI: Weighted Sum Rate Optimization for Cognitive Radio MIMO Broadcast Channels

Content Provider	IEEE Xplore Digital Library
Author	Lan Zhang Yan Xin Ying-Chang Liang
Copyright Year	2008
Description	Author affiliation: Dept. of Electron. & Comput. Eng., Nat. Univ. of Singapore, Singapore (Lan Zhang; Yan Xin)
Abstract	In this paper, we consider a cognitive radio (CR) network in which the unlicensed (secondary) users (SUs) are allowed to concurrently access the spectrum allocated to the licensed (primary) users provided that their interference to the primary users (PUs) satisfies certain constraints. We study a weighted sum rate maximization problem for the secondary user (SU) multiple input multiple output (MIMO) broadcast channel (BC), in which the SUs have not only the sum power constraint but also interference constraints. We first transform this multi- constraint maximization problem into its equivalent form, which involves a single constraint with multiple auxiliary variables. Fixing these multiple auxiliary variables, we establish a duality result for the equivalent problem. Our duality result can be viewed as an extension of the previously known results, which depend on either a sum power constraint or per-antenna power constraints. Furthermore, we develop an efficient sub-gradient based iterative algorithm to solve the equivalent problem and show that the developed algorithm converges to a globally optimal solution. Computer simulations are also provided to corroborate the effectiveness of the proposed algorithm.
Starting Page	3679
Ending Page	3683
File Size	169243
Page Count	5
File Format	PDF
ISBN	9781424420759
DOI	10.1109/ICC.2008.692
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-05-19
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Cognitive radio MIMO Radio broadcasting Interference constraints Iterative algorithms Chromium Receiving antennas Constraint optimization Transmitters Communications Society
Content Type	Text
Resource Type	Article

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