标题：Underlay spectrum sharing with spatially random users and cooperative wireless power transfer
作者：Zhai, Chao ;Chen, He ;Wang, Xinhua ;Liu, Ju
作者机构：[Zhai, Chao ;Liu, Ju ] School of Information Science and Engineering, Shandong University, Jinan, China;[Wang, Xinhua ] College of Automation and Elec 更多
会议名称：9th International Conference on Wireless Communications and Signal Processing, WCSP 2017
会议日期：11 October 2017 through 13 October 2017
来源：2017 9th International Conference on Wireless Communications and Signal Processing, WCSP 2017 - Proceedings
摘要：This paper investigates a large-scale cognitive radio network with primary users (PUs) and secondary users (SUs) spatially and randomly distributed. All the PUs need to harvest wireless energy from their associated access points (APs) before transmitting information. To combat the low efficiency of wireless power transfer caused by the severe path-loss, we propose to apply an energy cooperation zone (EC) around each PU, wherein the best SU is selected to transfer wireless power along with the AP. Therefore, each PU can accumulate a predefined amount of energy more quickly to support the data transmission to its AP. To avoid the SUs causing strong interference, each active AP is protected by a guard zone, and only the SUs outside all the guard zones could access the channel together with all the active PUs. Numerical results show that the energy cooperation from SUs can greatly improve the area throughput of primary system and more opportunities can be achieved for the SUs' transmissions. © 2017 IEEE.