This article studies the reliable and secure communications for a wireless-powered non-orthogonal multiple access (NOMA) system in presence of eavesdroppers. A joint artificial noise power allocation (JAP) scheme is proposed to ensure reliability security system. Based on JAP scheme, analytical closed-form expressions connection outage probability (COP), secrecy (SOP) effective throughput (EST) are derived, respectively, evaluate performance security-required user. Also, asymptotic SOP EST...

Increasing spectrum-efficiency (SE) as well energy-efficiency (EE) has attracted much attention recently due to the fact that future wireless networks need address issues of high throughput and low power consumption. However, objective for optimizing SE sometimes conflicts with one EE, methods improving EE may result in a decrease SE. In this paper, we consider SE-EE tradeoff cognitive radio (CR) co-operative spectrum sensing (CSS). First, formulate general problem, analyze two special...

An excellent routing protocol is important for wireless sensor network (WSN) construction and efficient data transmission. With the continuous expansion of application scenarios scopes Internet Things, existing WSN protocols are no longer suitable complex structure huge demands communications. Aiming at these issues protocols, such as short lifetime caused by high energy consumption uneven distribution surviving nodes, this article proposes an energy-saving clustering based on adaptive...

Unmanned aerial vehicles (UAVs) equipped with data transmission and sensing facilities are gaining more popularity in different applications due to its miniaturization mobility. In this paper, a UAV-based overlay cognitive radio (CR) network is investigated which the UAV used as secondary user (SU). This paper proposes an efficient energy management solution improve performance of UAV. When SUs opportunistically utilize licensed spectrum primary network, needed determine whether transmit or...

Unmanned aerial vehicles (UAVs) have shown significant advantages in disaster relief, emergency communication, and Integrated Sensing Communication (ISAC). However, the escalating demand for UAV spectrum is severely restricted by scarcity of available spectrum, which turn significantly limits communication performance. Additionally, openness wireless channel poses a serious threat, such as wiretapping jamming. Therefore, it necessary to improve security performance system. Recently,...

Abstract With the development of sixth generation wireless communication networks, low latency is required to support its applications. In order meet requirement, short packet considered be used, in which a ground sensor transmits sensing information fixed-wing unmanned aerial vehicle (UAV). this paper, we consider maximizing energy efficiency intelligent reflecting surface (IRS)-assisted UAV by optimizing UAV’s speed, trajectory, transmit power and passive beamforming IRS. Since...

Unmanned Aerial Vehicle (UAV) aided communication has the potential to provide on-demand wireless services and improve outdoor link throughput. Applications for UAVs are rapidly growing with development of Internet Things. Because limited battery energy, need time-limited spectrum access complete data transmission. Hence there two challenges UAV-based communication: 1) Spectrum-efficient design; 2) Energy-efficient design. In this paper, we investigate optimization efficiency (SE) energy...

Unmanned aerial vehicle (UAV)-enabled communication has emerged as an irreplaceable technology in military, disaster relief and emergency scenarios. This correspondence investigates the average throughput a UAV-enabled cognitive radio network, where UAV is regarded dedicated secondary user to enhance network coverage spectral efficiency. Based on probabilistic line-of-sight channel, we exploit joint design of trajectory resource allocation maximize under constraints co-channel interference...

In this letter, we investigate the outage-constrained robust secure design in a multiple-input single-output (MISO) energy harvesting (EH) cognitive radio network (CRN), where malicious receivers (ERs) may wiretap desired information and hence can be treated as potential eavesdroppers (Eves). particular, considering non-linear model, our objective is to transmit covariance matrix maximize secrecy efficiency (SEE) under given outage probability power constraints, while satisfying EH...

The deployment of unmanned aerial vehicle (UAV)-enabled cognitive radio system in the area covered by primary network is studied this letter. UAV shares spectrum with user (PU) and aims to maximize transmitted bits limited battery capacity. When flies towards transmitter, sensing performance throughput will be improved. However, energy consumption increases linearly flying distance. goal letter find optimal position optimize as well power allocation such that maximized while PU sufficiently...

Fifth-generation (5G) wireless networks are expected to achieve 1000 times higher capacity compared with fourth-generation networks. Thus, improving the spectrum efficiency (SE) is a crucial problem, which must be considered. Cognitive radio (CR) considered an effective approach alleviate scarcity problem. In this paper, based on location information of primary transmitter (PT) and CR network, we estimate distance between PT secondary (ST) then propose joint sensing power allocation (JSS-PA)...

The aim of the study presented in this paper is to develop a flexible network structure for temperature monitoring super high arch dam under construction period. multiple channel acquisition method collects and analyzes system including stable field bus sensors, communication between intelligent module control unit proposed. In system, total 3 kinds networks which independently marked by ∗(1), ∗(2), ∗(3) were proposed, with ∗(1) being lowest priority highest priority. (ITU Bus) connects all...

This paper studies the secure transmit design for a downlink multiple-input-single-output cognitive radio network (CRN) with practical energy harvesting (EH) model. Due to open architecture of CRN, confidential information intended secondary receiver is prone be eavesdropped by external eavesdroppers (Eves). Specifically, considering imperfect channel state information, our aim jointly beamforming vector and power splitting ratio, such that outage-constrained secrecy rate maximized under...

In cognitive radio networks, a secondary user (SU) equipped with frequency (RF) energy-harvesting circuits can not only harvest the RF energy from primary transmitter, but also recycle its self-power when transmitting. this paper, we are concerned following design metrics: SU's harvested energy, efficiency, and harvesting which is defined as ratio of average by SU over consumption. We interested in two tradeoff designs: one between efficiency other efficiency. Multiobjective optimization...

The unmanned aerial vehicle (UAV) assisted communication can significantly improve the coverage and spectrum efficiency of Internet Things (IoT). One main feature IoT is short packet (SPC), in which data transmission uses finite block-length codewords. rate error will affect effective throughput IoT. In this paper, we investigate impact SPC on performance UAV-enabled sharing network. Specifically, optimization energy (EE) UAV system considered since battery usually limited. We design rate,...

The flexibility and controllable mobility of unmanned aerial vehicles (UAVs) render them easier to become platforms carrying out integrated sensing communication (ISAC) functionality, the cooperation among multiple UAVs is a promising way achieve simultaneous multi-static radar coordinated point (CoMP) transmission, leading an enhanced ISAC service. However, due intrinsically limited resources that can utilize, it challenging performance improvement for dual purposes. Toward this end, in...

In this paper, we investigate a robust transmit design in underlay energy harvesting (EH) cognitive radio networks (CRNs), where the malicious receivers (ERs) can be treated as potential eavesdroppers (Eves) due to their ability of wiretapping desired information. Considering general case statistical Eves' channel state information (CSI), signals secret and energy-efficient manner, an outage-constrained secrecy efficiency (OC-SEE) optimization problem is formulated beamforming vectors. The...

This study was designed to investigate the association between new digital media and depressive symptoms in a representative Chinese adolescent sample. An existing national data source used, that surveyed 16,205 adolescents 2013-2014. Adolescents who spent more time on screen activities or less non-screen were significantly likely have symptoms. New had greater girls than boys regarding depression. The of depression also showed decreased trend across economic regions with lower economically...