Time Allocation in Ambient Backscatter Assisted RF-Powered Cognitive Radio Network with Friendly Jamming against Eavesdropping

Ronghua LUO  Chen LIU  

IEICE TRANSACTIONS on Communications   Vol.E103-B   No.9   pp.1011-1018
Publication Date: 2020/09/01
Publicized: 2020/03/03
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2018EBP3351
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
ambient backscatter,  RF-powered cognitive radio network,  physical layer security,  harvest-then-transmit,  secrecy rate,  

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In this paper, we study a radio frequency (RF)-powered backscatter assisted cognitive radio network (CRN), where an eavesdropper exists. This network includes a primary transmitter, a pair of secondary transmitter and receiver, a friendly jammer and an eavesdropper. We assume that the secondary transmitter works in ambient backscatter (AmBack) mode and the friendly jammer works in harvest-then-transmit (HTT) mode, where the primary transmitter serves as energy source. To enhance the physical layer security of the secondary user, the friendly jammer uses its harvested energy from the primary transmitter to transmit jamming noise to the eavesdropper. Furthermore, for maximizing the secrecy rate of secondary user, the optimal time allocation including the energy harvesting and jamming noise transmission phases is obtained. Simulation results verify the superiority of the proposed scheme.