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Cognitive Radio Strategy in Simultaneous Wireless Information and PowerTransfer System
ZHU Fengchao 1,Gao Feifei 2 *
1.Departmentofautomation,UniversityofTsinghua；TheSecondArtilleryEngineeringUniversity
2. Department of automation, University of Tsinghua, Beijing 100084
*Correspondence author
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Funding: 高等学校博士学科点专项科研基金新教师类资助课题 （No.20110002120059）
Opened online:31 March 2014
Accepted by: none
Citation: ZHU Fengchao,Gao Feifei.Cognitive Radio Strategy in Simultaneous Wireless Information and PowerTransfer System[OL]. [31 March 2014] http://en.paper.edu.cn/en_releasepaper/content/4590697
 
 
In this letter, we consider the rate maximization of a new cognitiveratio (CR) scenario when multiple primary users (PU) are operatingunder the simultaneous wireless information and power transfer(SWIPT) mode. Since the rate maximization problem is NP-hard, weseparate the derivation approach into the following two steps: (i)we prove that the optimal transmit covariance is of rank-one; (ii) weapply the semi-definite programming (SDP) relaxation. Two suboptimalalgorithms that provide the upper bound and the lower bound of theoriginal solutions are proposed to cope with thisNP-hard problem. The duality gap is demonstrated to be very small byMonte Carlo simulations.
Keywords:Cognitive ratio (CR); simultaneous wireless information and powertransfer (SWIPT); semi-definite programming (SDP) relaxation
 
 
 

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