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Cognitive spectrum access with energy harvesting primary user and best secondary user selection
Author(s) -
Zhai Chao,
Zheng Lina,
Yu Zhiyuan
Publication year - 2019
Publication title -
transactions on emerging telecommunications technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.366
H-Index - 47
ISSN - 2161-3915
DOI - 10.1002/ett.3737
Subject(s) - cognitive radio , energy harvesting , transmitter power output , computer science , throughput , interference (communication) , energy (signal processing) , wireless , power (physics) , computer network , electronic engineering , telecommunications , real time computing , transmitter , engineering , mathematics , channel (broadcasting) , physics , statistics , quantum mechanics
Energy harvesting and spectrum sharing are promising techniques to improve the energy and spectral efficiency of wireless networks. In this work, we propose a two‐phase spectrum sharing scheme with multiple secondary users (SUs) coexisting with an energy harvesting primary user (PU). In Phase I, along with a power beacon transferring wireless power to PU, an SU is selected to transmit data using its maximal power, from which the interference can help charge PU. In Phase II, PU will transmit data using its harvested energy and, meanwhile, another SU is selected to transmit data with a controlled power under an interference constraint of primary system. Particularly, if PU has not harvested any energy in Phase I, it will keep silent in Phase II, and an SU is selected to transmit using its maximal power. Numerical results show that our scheme can achieve a reasonably good throughput for SUs while improving the performance of primary system.