Adaptive threshold and optimal frame duration for multi-taper spectrum sensing in cognitive radio

Salam, Ahmed O. Abdul; Sheriff, Ray E.; Al-Araji, Saleh R.; Mezher, Kahtan; Nasir, Qassim

doi:10.1016/j.icte.2018.02.002

Cited by 11 publications

(1 citation statement)

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“…Cognitive radio networks (CRNs) have received considerable attention as a means to use the unused spectrum to enhance the spectral efficiency (SE) [ 1 ]. In CRNs, unlicensed secondary users (SUs) can opportunistically access the spectrum unoccupied by primary users (PUs) as long as they do not interfere with the operation of the PUs [ 2 ]. To realize effective spectrum sharing between two networks, several researchers have attempted to mitigate co-channel interference, for instance, through transmit power control (TPC) [ 3 , 4 ], subcarrier allocation [ 5 ] and transmit beamforming pattern [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Low-Complexity Transmit Power Control for Secure Communications in Wireless-Powered Cognitive Radio Networks

Lee

2021

Sensors

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In this study, wireless-powered cognitive radio networks (WPCRNs) are considered, in which N sets of transmitters, receivers and energy-harvesting (EH) nodes in secondary networks share the same spectrum with primary users (PUs) and none of the EH nodes is allowed to decode information but can harvest energy from the signals. Given that the EH nodes are untrusted nodes from the point of view of information transfer, the eavesdropping of secret information can occur if they decide to eavesdrop on information instead of harvesting energy from the signals transmitted by secondary users (SUs). For secure communications in WPCRNs, we aim to find the optimal transmit powers of SUs that maximize the average secrecy rate of SUs while maintaining the interference to PUs below an allowable level, while guaranteeing the minimum EH requirement for each EH node. First, we derive an analytical expression for the transmit power via dual decomposition and propose a suboptimal transmit power control algorithm, which is implemented in an iterative manner with low complexity. The simulation results confirm that the proposed scheme outperforms the conventional distributed schemes by more than 10% in terms of the average secrecy rate and outage probability and can also considerably reduce the computation time compared with the optimal scheme.

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