Abstract
In this study, we investigate energy-efficient secure communications for wireless-powered cognitive ratio networks, in which multiple secondary users (SUs) share the same frequency band with primary users (PUs) and energy harvesting (EH) nodes harvest energy from the transmitted signals, even though information decoding is not permitted. To maximize the average secrecy energy efficiency (SEE) of SUs while ensuring acceptable interference on PUs and the required amount of energy for the EH nodes, we propose an energy-efficient transmit power control algorithm using dual decomposition, wherein suboptimal transmit powers are determined in an iterative manner with low complexity. Through extensive simulations in various scenarios, we verify that the proposed scheme has a higher average SEE than conventional schemes and a considerably shorter computation time than the optimal scheme.
Highlights
Cognitive radio networks (CRNs) have emerged as an efficient tool for improving spectrum utilization through enablement of opportunistic access to vacant licensed spectrum bands [1]
We investigate energy-efficient secure communications for wireless-powered CRNs (WPCRNs), in which multiple secondary users (SUs) share the same frequency band with primary users (PUs) and energy harvesting (EH) nodes are permitted to only harvest energy from the signals transmitted by transmitters (Txs)
Rayleigh fading is used for the signal links whereas Rician fading with a K-factor of 6 is used for the EH links to reflect multi-path fading [11]
Summary
Cognitive radio networks (CRNs) have emerged as an efficient tool for improving spectrum utilization through enablement of opportunistic access to vacant licensed spectrum bands [1]. In [13,14], EE optimization problems for non-orthogonal multiple access (NOMA)-based WPCRNs were developed and energy-efficient resource allocations were proposed. In [15], a joint optimization of spectrum sensing and transmit power was investigated to maximize the EE of EH-enabled SUs. Spectrum sharing between different networks increases the risk of eavesdropping; some studies have examined physical layer security to ensure information confidentiality without reliance on the secret key in CRNs [16,17,18,19,20]. We investigate energy-efficient secure communications for WPCRNs, in which multiple SUs share the same frequency band with PUs and EH nodes are permitted to only harvest energy from the signals transmitted by transmitters (Txs).
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