In this letter, we study energy-efficient precoder design in a three-node MIMO wiretap channel. Different from previous works area that mainly focus on secrecy rate maximization or power minimization problems, here, aim to maximize the energy efficiency (EE) of system subject secret and transmit constraints, which is nonconvex optimization hard tackle. To solve it, first transform it into an equivalent parameterized polynomial subtractive form then approximate problem convex by means Taylor...

Network energy resources are limited in communication systems, which may cause shortages mobile devices at the user end. Active Reconfigurable Intelligent Surfaces (A-RIS) not only have phase modulation properties but also enhance signal strength; thus, they expected to solve shortage problem experience end 6G communications. In this paper, a resource allocation algorithm for maximizing sum of harvested is proposed an active RIS-assisted Simultaneous Wireless Information and Power Transfer...

In this paper, we propose a load-aware and QoS- aware user association strategy that jointly considers the load of each BS user's achievable rate instead only utilizing latter, formulate it as network-wide weighted utility maximization problem to reveal how heterogeneous cellular network should self-organize. This is nonlinear mixed-integer optimization problem, its optimum solutions are very difficult be obtained when large scale one. To solve proposed relax indicator variables adopt...

The profound fusion of reconfigurable intelligent surfaces (RIS) with non-orthogonal multiple access (NOMA) holds the potential to substantially boost data transmission rates within Internet-of-Medical-Things (IoMT). However, a notable concern arises from utilization successive interference cancellation (SIC) technology by NOMA users in IoMT networks, which raises privacy challenges when dealing substantial number ecosystem. This paper introduces groundbreaking approach leveraging RIS...

In this study, the authors address downlink resource (subchannels and power) allocation problem for device-to-device communication with wireless power transfer technique in a cellular network to improve energy efficiency (EE). The considered is formulated as maximising weighted EE solved by leveraging game-theoretic learning approach. Specifically, they first prove that an exact potential game applies there exists best Nash equilibrium (NE) which optimal solution of optimisation problem....

Energy efficiency is regards as an important problem in energy-limited wireless medical sensor networks owing to the energy shortage. On other hand, full-duplex considered promising technology for future consumer that provides higher transmission rate. In this paper, we discussed a secure energy-efficient beamformer design was impaired by channel state information (CSI) two-way multi-input multi-output (MIMO) smart healthcare, enabling simultaneous data and power communication. We consider...

To overcome challenges such as limited energy availability for terminal devices, constrained network coverage, and suboptimal spectrum resource utilization, with the overarching objective of establishing a sustainable efficient interconnection infrastructure, we introduce an innovative Intelligent Reflective Surface (IRS) technology. This cutting-edge IRS technology is employed to architect wireless energy-efficient cognitive secure communication assisted by IRS. further optimize overall...

With the rapid development of wireless communication networks and Internet Things technology (IoT), higher requirements have been put forward for spectrum resource utilization system performance. In order to further improve resources performance, this paper proposes an intelligent reflecting surface (IRS)-assisted fair energy allocation algorithm cognitive multiple-input single-output (MISO) wireless-powered networks. The goal is maximize minimum receiving power in receiver, which...

The accuracy of channel state information (CSI) acquisition is nontrivial for intelligent reflection surface (IRS)-assisted massive multiple-input–multiple-output (MIMO) systems due to the IRS comprises a large number low-cost electromagnetic units that can smartly reflect impinging signal. In this article, we investigate downlink estimation problem IRS-assisted millimeter-wave (mmWave) MIMO systems, where provides effective reflected paths enhance coverage and spectral efficiency. To reduce...

In this paper, we consider a multi-pair relay system with massive antenna arrays deployed at single relay. We analyze the ergodic achievable rate when MRC/MRT is utilized consideration of imperfect channel state information (CSI). An analytical expression derived, based on which, asymptotic analysis and power scaling law are conducted number antennas N grows large. It shown that logarithmically increases over antennas. Moreover, transmit terminals can be scaled down simultaneously maximally...

Vehicle to everything (V2X) has been deemed a promising technology due its potential achieve traffic safety and efficiency. This paper considers V2X downlink system with simultaneous wireless information power transfer (SWIPT) where the base station not only conveys data energy two types of vehicular receivers, such as one hybrid power-splitting receiver, multiple but also prevents from being intercepted by eavesdroppers (idle receivers). Both receivers are equipped antennas, whereas...

The deployment of small-cell access points(SCAs) is widely acknowledged as a promising network densification way to satisfy the future capacity needs 5G wireless cellular network. In this paper, we study power allocation problem in heterogeneous downlink while satisfying QoS constraints and simultaneously. scheme formulated maximizing system energy efficiency then transformed into tractable convex optimization problem. Utilizing multiflow RZF beamforming reduce complexity, an iterative...

A multi-pair large-scale multi-antenna relaying system is considered in this paper. We investigate the energy efficiency (EE) performance by taking circuit power consumption into account when maximum ratio combining/maximum transmission explored at relay station (RS). By utilizing law of large numbers, an analytical expression EE derived. Based on this, we characterize trend with regard to transmit users and RS, number RS antennas. Regarding it shown that optimal can be always achieved...