Open AccessSimultaneous Information and Power Transfer for Multi‐antenna Primary‐Secondary Cooperation in Cognitive Radio Networks
Author(s) -
Liu Zhi Hui,
Xu Wen Jun,
Li Sheng Yu,
Long Cheng Zhi,
Lin Jia Ru
Publication year - 2016
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.16.0115.0561
Subject(s) - cognitive radio , beamforming , maximum power transfer theorem , computer science , electronic engineering , transmission (telecommunications) , transmitter power output , wireless , antenna (radio) , information transfer , data transmission , wireless power transfer , energy (signal processing) , computer network , power (physics) , telecommunications , engineering , transmitter , channel (broadcasting) , physics , quantum mechanics , statistics , mathematics
In this paper, cognitive radio and simultaneous wireless information and power transfer (SWIPT) are effectively combined to design a spectrum‐efficient and energy‐efficient transmission paradigm. Specifically, a novel SWIPT‐based primary‐secondary cooperation model is proposed to increase the transmission rate of energy/spectrum constrained users. In the proposed model, a multi‐antenna secondary user conducts simultaneous energy harvesting and information forwarding by means of power splitting (PS), and tries to maximize its own transmission rate under the premise of successfully assisting the data delivery of the primary user. After the problem formulation, joint power splitting and beamforming optimization algorithms for decode‐and‐forward and amplify‐and‐forward modes are presented, in which we obtain the optimal PS factor and beamforming vectors using a golden search method and dual methods. Simulation results show that the proposed SWIPTbased primary‐secondary cooperation schemes can obtain a much higher level of performance than that of non‐SWIPT cooperation and non‐cooperation schemes.