Abstract
In this paper, we consider the issue of the secure transmissions for the cognitive radio-based Internet of Medical Things (IoMT) with wireless energy harvesting. In these systems, a primary transmitter (PT) will transmit its sensitive medical information to a primary receiver (PR) by a multi-antenna-based secondary transmitter (ST), where we consider that a potential eavesdropper may listen to the PT’s sensitive information. Meanwhile, the ST also transmits its own information concurrently by utilizing spectrum sharing. We aim to propose a novel scheme for jointly designing the optimal parameters, i.e., energy harvesting (EH) time ratio and secure beamforming vectors, for maximizing the primary secrecy transmission rate while guaranteeing secondary transmission requirement. For solving the nonconvex optimization problem, we transfer the problem into convex optimization form by adopting the semidefinite relaxation (SDR) method and Charnes–Cooper transformation technique. Then, the optimal secure beamforming vectors and energy harvesting duration can be obtained easily by utilizing the CVX tools. According to the simulation results of secrecy transmission rate, i.e., secrecy capacity, we can observe that the proposed protocol for the considered system model can effectively promote the primary secrecy transmission rate when compared with traditional zero-forcing (ZF) scheme, while ensuring the transmission rate of the secondary system.
Highlights
With the rapid development of wireless communication and networking technologies, an increasing number of devices need to be connected globally and communicate automatically. erefore, the emerging of the Internet of ings (IoT) as a promising paradigm can achieve a fusing of the various technologies in 5G communication systems, which have been widely applied in smart cities, agriculture, and environment monitoring [1,2,3,4,5,6]
The medical care and health care are becoming one of the most popular applications based on the IoT [7, 8], named the Internet of Medical ings (IoMT), which can collect the data from the medical devices and applications to improve the treatment effect, disease diagnosis, and patient experience, while reducing misdiagnosis rate and treatment cost
We assume that an attacker is located near the primary receiver (PR) to eavesdrop the primary transmitter (PT)’s medical data. us, to enable the secure transmission of the PT’s signal, we investigate a typical cognitive radio network with wireless-powered relay (CRN-WPR) and jointly design the optimal energy harvesting (EH) time ratio and secure beamforming vectors to maximize the secrecy transmission rate of the primary system, while effectively guaranteeing the secondary transmission rate. e main contributions are summarized as follows: (i) We propose a corresponding protocol for EH and secrecy information transmission for a cognitive radio-based IoMT system, where the relay node secondary transmitter (ST) is equipped with multiple antennas to perform EH at first and transfer the sensitively primary signal with DF processing to the destination in security with its own signal
Summary
With the rapid development of wireless communication and networking technologies, an increasing number of devices need to be connected globally and communicate automatically. erefore, the emerging of the Internet of ings (IoT) as a promising paradigm can achieve a fusing of the various technologies in 5G communication systems, which have been widely applied in smart cities, agriculture, and environment monitoring [1,2,3,4,5,6]. Adopting cognitive radio technology with EH can effectively improve the transfer efficiency for IoMT, the variety of medical devices in healthcare fields will introduce several security problems [18]. Us, to enable the secure transmission of the PT’s signal, we investigate a typical cognitive radio network with wireless-powered relay (CRN-WPR) and jointly design the optimal EH time ratio and secure beamforming vectors to maximize the secrecy transmission rate of the primary system, while effectively guaranteeing the secondary transmission rate. (i) We propose a corresponding protocol for EH and secrecy information transmission for a cognitive radio-based IoMT system, where the relay node ST is equipped with multiple antennas to perform EH at first and transfer the sensitively primary signal with DF processing to the destination in security with its own signal.
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