In this letter, we propose intelligent reflecting surface (IRS) aided multi-antenna physical layer security. We present a power efficient scheme to design the secure transmit allocation and phase shift. It aims minimize subject secrecy rate constraint at legitimate user. Due non-convex nature of formulated problem, an alternative optimization algorithm semidefinite programming (SDP) relaxation deal with issue. Also, closed-form expression optimal beamformer is derived. Finally, simulation...

Cognitive radio (CR) and non-orthogonal multiple access (NOMA) have been deemed two promising technologies due to their potential achieve high spectral efficiency massive connectivity. This paper studies a multiple-input single-output NOMA CR network relying on simultaneous wireless information power transfer conceived for supporting population of limited battery-driven devices. In contrast most the existing works, which use an ideally linear energy harvesting model, this study applies more...

In this paper, we study different secrecy rate optimization techniques for a multiple-input–multiple-output (MIMO) channel, where multiantenna cooperative jammer is employed to improve secret communication in the presence of eavesdropper. Specifically, consider two problems, namely, power minimization and maximization. These problems are not jointly convex terms transmit covariance matrices legitimate transmitter jammer. To circumvent these nonconvexity issues, alternatively design matrix...

With the emergence of diverse mobile applications (such as augmented reality), quality experience users is greatly limited by their computation capacity and finite battery lifetime. Mobile edge computing (MEC) wireless power transfer are promising to address this issue. However, these two techniques susceptible propagation delay loss. Motivated chance short-distance line-of-sight achieved leveraging unmanned aerial vehicle (UAV) communications, an UAV-enabled powered MEC system studied. A...

We consider an intelligent reflecting surface (IRS) wireless-powered NOMA Internet-of-Things (IoT) network, where multiple IoT devices can communicate with access point (AP) the aid of IRS. Specifically, harvest energy from a nearby appropriative power station (PS) during wireless transfer (WET) phase through direct links as well Then, harvested achieve information (WIT) uplink between and AP by adopting protocol. A novel resource allocation scheme is proposed to maximized sum throughput...

In this letter, we investigate the energy efficiency (EE) problem in a millimeter wave massive MIMO system with non-orthogonal multiple access (NOMA). Multiple two-user clusters are formulated according to their channel correlation and gain difference. Following this, propose hybrid analog/digital precoding scheme for low radio frequency chains structure at base station. On basis, formulate power allocation aiming maximize EE under users' quality of service requirements per-cluster...

This paper investigates a wireless powered sensor network, where multiple nodes are deployed to monitor certain external environment. A multiantenna power station (PS) provides the these during energy transfer phase, and consequently employ harvested transmit their own monitoring information fusion center (WIT) phase. The goal is maximize system sum throughput of two different scenarios considered, i.e., PS belong same or service operator(s). For first scenario, we propose global optimal...

Cognitive satellite–terrestrial networks (CSTNs) have been recognized as a promising network architecture for addressing spectrum scarcity problem in next-generation communication networks. In this paper, we investigate the secure transmission CSTNs where terrestrial base station serving green interference resource is introduced to enhance security of satellite link. Adopting stochastic model channel state information uncertainty, propose and robust beamforming framework minimize transmit...

This paper investigates simultaneous wireless information and power transfer (SWIPT) for a multiple-input-single-output (MISO) secrecy channel. First, transmit beamforming without artificial noise (AN) is designed to achieve the rate maximization problem subject energy harvesting (EH) constraints. not convex, but this can be solved by applying bisection search sequence of associated minimization problems, each which using novel relaxation approach. Moreover, we extend our proposed algorithms...

In this paper, we investigate simultaneous wireless information and power transfer systems for multiuser multiple-input single-output secure broadcasting channels. Considering imperfect channel state information, introduce a robust beamforming design, where the transmit is minimized subject to secrecy rate outage probability constraint legitimate users harvested energy harvesting receivers. The original problem non-convex due presence of probabilistic constraints. With aid Bernstein-type...

This paper investigates secrecy rate optimization problems for a multiple-input-single-output (MISO) channel in the presence of multiple multiantenna eavesdroppers. Specifically, we consider power minimization and maximization this network. First, formulate problem based on assumption that legitimate transmitter has perfect state information (CSI) user eavesdroppers, where can be reformulated into second-order cone program (SOCP). In addition, provide closed-form solution transmit...

Device-to-device (D2D) communications as an underlay to cellular networks can not only increase the system capacity and energy efficiency but also enable national security public safety services. A key requirement for these services is provide alternative access when they are partially or fully damaged due a natural disaster event. In this paper, we employ harvesting (EH) at relay with simultaneous wireless information power transfer prolong lifetime of constrained network. particular,...

In this paper, an energy harvesting scheme for a multi-user multiple-input-multiple-output secrecy channel with artificial noise (AN) transmission is investigated. Joint optimization of the transmit beamforming matrix, AN covariance and power splitting ratio conducted to minimize under target rate, total power, harvested constraints. The original problem shown be non-convex, which tackled by two-layer decomposition approach. inner layer solved through semi-definite relaxation, outer problem,...

This work exploits the potential of a novel simultaneous transmission and reflection reconfigurable intelligent surface (STAR-RIS) in improving security multiple-input single-output (MISO) network, where three protocols, namely, energy splitting (ES), mode selection (MS), time (TS), are studied. The objective is to maximize weighted sum secrecy rate (WSSR) by jointly designing beamforming (BF) transmitting reflecting coefficients (TARCs). A path-following based technique first developed...

This paper studies the use of multi-antenna harvest-and-jam (HJ) helpers in a amplify-and-forward (AF) relay wiretap channel assuming that direct link between source and destination is broken. Our objective to maximize secrecy rate at subject transmit power constraints AF HJ helpers. In case perfect state information (CSI), joint optimization artificial noise (AN) covariance matrix for cooperative jamming beamforming studied using semidefinite relaxation (SDR) which tight, while suboptimal...

This paper studies an intelligent reflecting surface (IRS) aided wireless powered sensor network (WPSN). Specifically, a power station (PS) provides energy to multiple internet of thing (IoT) devices which supports them deliver their own messages access point (AP). Moreover, we deploy IRS enhance the performance WPSN by intelligently adjusting phase shift each element. To evaluate assisted WPSN, maximize its sum throughput jointly optimize matrices and transmission time allocations. Due...

This paper investigates the impact of intelligent reflecting surface (IRS) enabled wireless secure transmission. Specifically, an IRS is deployed to assist multiple-input multiple-output (MIMO) system enhance secrecy performance, and artificial noise (AN) employed introduce interference degrade reception eavesdropper. To improve we aim maximize achievable rate, subject transmit power constraint, by jointly designing precoding transmission, AN jamming, phase shift IRS. We first propose...

Terahertz (THz) communication has been regarded as one promising technology to enhance the transmission capacity of future Internet-of-Things (IoT) users due its ultrawide bandwidth. Nonetheless, major obstacle that prevents actual deployment THz lies in inherent huge attenuation. Intelligent reflecting surface (IRS) and multiple-input-multiple-output (MIMO) represent two effective solutions for compensating large path loss systems. In this article, we consider an IRS-aided multiuser MIMO...

This correspondence reveals the potential of reconfigurable intelligent surface (RIS) in anti-jamming communications. In particular, we consider an aerial RIS (ARIS) that can be flexibly deployed air so as to mitigate jamming attacks and enhance legitimate transmissions. We formulate joint optimization ARIS deployment passive beamforming solve problem through alternating framework, where location is obtained by successive convex approximation reflection beamformer tackled with manifold...

This paper aims to investigate the benefit of using intelligent reflecting surface (IRS) in multi-user multiple-input single-output (MU-MISO) systems, presence eavesdroppers. We maximize weighted sum secrecy rate by jointly designing secure beamforming (BF), artificial noise (AN), as well phase shift IRS. An alternating optimization (AO) method is proposed deal with formulated non convex problem. In particular, and AN jamming matrix are optimally designed via successive approximation (SCA)...

This paper proposes a new transmission policy for intelligent reflecting surface (IRS) empowered wireless powered internet of things systems. Particularly, an energy station (ES) wirelessly charges multiple IoT devices during downlink transfer (WET) and then these deliver their own message to access point (AP) uplink information (WIT). Also, IRS is deployed improve harvesting data capabilities. To enhance self-sustainability the IRS, harvests from ES based on harvest-then-transmit protocol....

In this work, we study a simultaneous transmitting and reflecting reconfigurable intelligent surface (RIS)-assisted multiple-input multiple-output network. For the system under consideration, maximize weighted sum rate, mainly based on energy splitting (ES) scheme. To tackle optimization problem, sub-optimal block coordinate descent (BCD) algorithm is proposed to design precoding matrices coefficients (TRCs) in an alternate manner. Specifically, are solved using Lagrange dual method, while...

This paper investigates the robust beamforming design in a secrecy multiple-input single-output (MISO) network aided by intelligent reflecting surface (IRS) with simultaneous wireless information and power transfer (SWIPT). Specifically, considering that energy receivers (ERs) are potential eavesdroppers (Eves) imperfect channel state (CSI) of direct cascaded channels can be obtained, we investigate max-min fairness design. The objective is to maximize minimum rate among legitimate (IRs). To...

This work investigates the effect of double intelligent reflecting surface (IRS) in improving spectrum efficient multi-user multiple-input multiple-output (MIMO) network operating millimeter wave (mmWave) band. Specifically, we aim to solve a weighted sum rate maximization problem by jointly optimizing digital precoding at transmitter and analog phase shifters IRS, subject minimum achievable constraint. To facilitate design an solution, first reformulate original into tractable one...

This article studies secure communication in an Internet of Things (IoT) network, where the confidential signal is sent by active refracting reconfigurable intelligent surface (RIS)-based transmitter, and a passive reflective RIS utilized to improve secrecy performance users presence multiple eavesdroppers. Specifically, we aim maximize weighted sum rate jointly designing power allocation, transmit beamforming (BF) RIS, phase shifts RIS. To solve nonconvex optimization problem, propose...