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Spectrum Efficiency Maximization for Cooperative power beacon-Enabled Wireless powered Communication Networks

China Communications 2021年第12期18卷 230-251页

作者： Wenjun Xu Wei Chen Yongjian Fan Zhi Zhang Xinxin Shi Key Lab of Universal Wireless Communications Ministry of EducationBeijing University of Posts and TelecommunicationsBeijing 100876China Hebei Key Laboratory of Security and Protection Information Sensing and Processing Hebei University of EngineeringHandan 056038China State Key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China Beijing Telecom Planning&Designing Institute Co. Ltd.Beijing 100048China

We consider a spectrum efficiency(SE)maximization problem for cooperative power beacon-enabled wireless powered communication networks(CPB-WPCNs),where each transmitter harvests en-ergy from multi-antenna power beacons(PBs)and transmits data to the corresponding *** data transmission,both orthogonal transmission,i.e.,the time splitting(TS)mode,and non-orthogonal trans-mission,i.e.,the interference channel(IC)mode,are *** to improve the system SE,the energy beamformers of PBs,the transmit power,and the transmit time duration of transmitters are jointly *** the TS mode,the original non-convex problem is transformed into a convex opti-mization problem by means of variable substitution and semidefinite relaxation(SDR).The rank-one na-ture of this SDR is proved,and then a Lagrange-dual based fast algorithm is proposed to obtain the opti-mal solution with much lower *** the IC mode,to conquer the strong non-convexity of the problem,a branch-reduce-and-bound(BRB)mono-tonic optimization algorithm is designed as a ***,a low-complexity distributed suc-cessive convex approximation(SCA)algorithm is ***,simulation results validate the perfor-mance of the proposed algorithms,achieving optimal-ity within only 1%∼2%computation time compared to the CVX solver in the TS mode and achieving 98%of the optimal performance in the IC mode.

关键词： spectrum efficiency power beacon WPCN time splitting interference channel wireless power transfer

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