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Journal articles on the topic 'Radio relay system'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Shyam, Baboo Bambiwal, Singh Yaduvanshi Rajveer, and Kumar Pandey Vijay. "Performance Assessment of Channel Capacity of Co-operative Communication based System over Dual-hop Asymmetric RF/FSO system." International Journal of Engineering and Advanced Technology (IJEAT) 9, no. 4 (2020): 439–42. https://doi.org/10.35940/ijeat.C6452.049420.

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Cooperative Communication Systems and Relay Selection approaches are recent techniques of wireless communication system that enhance the quality of service (QoS). This research paper probes the execution of the Radio-Frequency and Free Space Optical (RF/FSO) Co-operative system using network of relays. The Co-operative relay system is typically composed of node of a source, the nodes of relays and node of a destination. The source and relay link (S-R link) follow the Generalized-K Fading distribution channel. The link connecting the relay node/device and the destination (R-D link) follows - Fa

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Su, Li Ping, Dong Chen, Wei Hua Huang, and Ning Li. "Joint Power Allocation and Relay Selection Optimization for Cognitive Radio Networks." Advanced Materials Research 791-793 (September 2013): 1153–59. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.1153.

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This paper investigates the joint power allocation (PA) and relay selection scheme (RS) in two-way relaying cognitive radio networks consisting of multiple user-pairs and multiple relays. In order to reduce the computational complexity for practical scenario, we propose a branch and bound based (BnB-based) power allocation and relay selection scheme and a greedy power allocation and relay selection scheme to maximize the system throughput. The system is assumed under the constraint that the interference power from the secondary nodes in two way relay systems to primary user (PU) shall be less

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D., Damodaram. "MIMO Based Cooperative Communication and Joint Maximum-Likelihood Detection for Cognitive Radio System." International Journal of Recent Technology and Engineering 10, no. 1 (2021): 39–43. http://dx.doi.org/10.35940/ijrte.a5720.0510121.

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In this work, novel cooperative communication strategies like Decode and Forward based relay schemes, joint maximum likelihood signal detection in combinational Multiple Input Multiple Output (MIMO) cooperative relay cognitive networks are used. The joint cooperative signal detection using Maximum-Likelihood (ML) detector at each relays, and associated path links improves the quality of services at the destination node, which can be dynamically altered using different relay combinations and associated iterative computational complexity accumulated during ML detection. Here the relay performs M

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D., Damodaram. "MIMO Based Cooperative Communication and Joint Maximum-Likelihood Detection for Cognitive Radio System." International Journal of Recent Technology and Engineering (IJRTE) 10, no. 1 (2021): 39–43. https://doi.org/10.35940/ijrte.A5720.0510121.

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In this work, novel cooperative communication strategies like Decode and Forward based relay schemes, joint maximum likelihood signal detection in combinational Multiple Input Multiple Output (MIMO) cooperative relay cognitive networks are used. The joint cooperative signal detection using Maximum-Likelihood (ML) detector at each relays, and associated path links improves the quality of services at the destination node, which can be dynamically altered using different relay combinations and associated iterative computational complexity accumulated during ML detection. Here the relay performs M

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Chen, Dong, Xiang Li, Li Ping Su, and Jin Liang. "Enhanced Power Allocation and Relay Selection Scheme in Two-Way Relaying Cognitive Radio Networks." Applied Mechanics and Materials 397-400 (September 2013): 1979–83. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.1979.

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This paper addresses the enhanced power allocation (PA) and relay selection scheme (RS) in two-way relaying cognitive radio networks consisting of multiple user-pairs and multiple relays. In order to reduce the computational complexity for practical scenario, we propose a branch and bound based (BnB-based) power allocation and relay selection scheme and a greedy power allocation and relay selection scheme to maximize the system throughput. Simulation results show that the proposed BnB-based PA and RS scheme can achieve better tradeoff of system throughput and complexity.

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Yang, Dongmei, Cheng Li, Baoquan Ren, Hongjun Li, and Kefeng Guo. "Analysis of relay selection schemes in underlay cognitive radio non-orthogonal multiple access networks." International Journal of Distributed Sensor Networks 18, no. 5 (2022): 155014772110663. http://dx.doi.org/10.1177/15501477211066304.

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This article investigates the impacts of relay selection schemes on cooperative underlay cognitive radio non-orthogonal multiple access networks, where the partial relay selection scheme, the max–min relay selection scheme and the two-stage relay selection scheme are applied in the network. Moreover, decode-and-forward protocol is used at the transmission relays. What’s more, in order to show the effect of the schemes on the considered network, the closed-form expressions and asymptotic expressions for the outage probability of the system are derived. Furthermore, the outage performance under

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Bou Saleh, Abdallah, Simone Redana, Jyri Hämäläinen, and Bernhard Raaf. "On the Coverage Extension and Capacity Enhancement of Inband Relay Deployments in LTE-Advanced Networks." Journal of Electrical and Computer Engineering 2010 (2010): 1–12. http://dx.doi.org/10.1155/2010/894846.

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Decode-and-forward relaying is a promising enhancement to existing radio access networks and is currently being standardized in 3GPP to be part of the LTE-Advanced release 10. Two inband operation modes of relay nodes are to be supported, namely Type 1 and Type 1b. Relay nodes promise to offer considerable gain for system capacity or coverage depending on the deployment prioritization. However, the performance of relays, as any other radio access point, significantly depends on the propagation characteristics of the deployment environment. Hence, in this paper, we investigate the performance o

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Chopra, Khyati, Ranjan Bose, and Anupam Joshi. "Secrecy Outage Performance of Cognitive Radio Network with Selection Combining at Eavesdropper." Recent Advances in Computer Science and Communications 13, no. 5 (2020): 987–98. http://dx.doi.org/10.2174/2213275912666190807122631.

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Background:: Based on the idea of cooperative communication, recently a lot of attention has been drawn to cooperative spectrum access for the secure information transmission in a Cognitive Radio Network (CRN). Security is one of the most important aspects of these networks, as due to their open and dynamic nature, they are extremely vulnerable to malicious behavior. Cooperative cognitive radio has emerged as a dynamic spectrum access technique, where an unlicensed (secondary) user is allowed to simultaneously access the licensed channels dedicated to a Primary User (PU), as long as the Qualit

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Priyanka, Yadlapalli, and R. Arthi. "Multi-relay Antennas for Energy Harvesting Cognitive Radio Networks using Energy-Assisted Decode Forward Method." International Journal of Engineering & Technology 7, no. 4.39 (2018): 645–48. http://dx.doi.org/10.14419/ijet.v7i4.39.25673.

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The single antenna relay energy-assisted decode forward (EDF) was not applicable for multi cognitive users that has less data rates. In order to achieve higher data rates with increased user demands energy harvesting or Simultaneous Wireless Information and Power Transfer (SWIPT) enabled networks with multi antenna relays are highly recommended. The proposed work considers multi relay EDFSWIPT for 5G systems with presence of transmitter and an antenna array. The transmitter affords information and energy to various multiple single-antenna secondary receivers (SR). The SR outfitted with a power

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Moydunov, Tayr, Adilkan Sarimsakov, Saltanat Omorova, Altynai Nychsanova, and Joomart Matisakov. "Analysis of radio relay station control system using IT-technologies." Naukovij žurnal «Tehnìka ta energetika» 15, no. 4 (2024): 136–46. https://doi.org/10.31548/machinery/4.2024.136.

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The study addressed the theoretical analysis of radio relay station control systems using modern information technologies. The study aimed to identify the potential for improving the performance, reliability and cost-effectiveness of such systems. The analysis investigated advanced sensor technologies, automation algorithms and monitoring techniques that could significantly reduce maintenance costs and speed up fault response. Key aspects affecting the performance of radio relay stations were considered, including the impact of climatic conditions and various operational scenarios. The importa

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Shepherd, Graham. "East-West Microwave Radio Relay System – Recollections." Journal of Telecommunications and the Digital Economy 12, no. 1 (2024): 109–11. http://dx.doi.org/10.18080/jtde.v12n1.944.

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The revisiting of the 1971 paper, ‘The Australian East-West Radio Relay System’, in this issue of the Journal has stimulated this author to recall several of the design challenges encountered with the project in the early 1970s, and the engineering solutions achieved.

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Moorhead, Simon. "Australian East-West Radio Relay System Revisited." Journal of Telecommunications and the Digital Economy 12, no. 1 (2024): 100–108. http://dx.doi.org/10.18080/jtde.v12n1.927.

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The Journal revisits an historic paper from 1971 by R. W. Richards and J. Donovan of GEC-AEI Telecommunications on the prime contractor’s role in the delivery of the Australian East-West radio relay system from Northam in Western Australia to Port Pirie in South Australia.

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Ключников, В. О. "Technique for a quickly deployed communication network creation based on radio relay lines." МОДЕЛИРОВАНИЕ, ОПТИМИЗАЦИЯ И ИНФОРМАЦИОННЫЕ ТЕХНОЛОГИИ 8, no. 3(30) (2020): 32–33. http://dx.doi.org/10.26102/2310-6018/2020.30.3.032.

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Радиорелейная связь занимает важное место в создании цифровой инфраструктуры. Современные цифровые радиорелейные линии позволяют организовать высокоскоростные каналы связи, поддерживающие передачу всех видов трафика, включая голосовые сообщения, пакетную передачу данных, видеосигналы в реальном режиме времени. В статье рассмотрены методики расчета цифровых радиорелейных линий связи, а также указаны общие рекомендации по их организации. Проектирование радиорелейных линий выполняется таким образом, чтобы они располагали высокой пропускной способностью и высокой надежностью с учетом физических (э

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Sultan, Kiran, Ijaz Mansoor Qureshi, Muhammad Atta-ur Rahman, Bassam A. Zafar, and Muhammad Zaheer. "CSI Based Multiple Relay Selection and Transmit Power Saving Scheme for Underlay CRNs Using FRBS and Swarm Intelligence." International Journal of Applied Metaheuristic Computing 10, no. 3 (2019): 1–18. http://dx.doi.org/10.4018/ijamc.2019070101.

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In this article, a multiple relay selection (MRS) scheme for signal-to-noise ratio (SNR) enhancement is proposed for underlay relay-assisted cognitive radio networks (RCRNs). A secondary source-destination pair experiencing deep fading on direct path is assisted by amplify-and-forward (AF) relays in an underlay mode. In this energy-constrained scenario, the aim is to maximize the secondary network's end-to-end SNR through an intelligent power-saving method incorporated with MRS. In contrast to the prior relay selection (RS) schemes, the relay-selection factor is the difference of SNR of the so

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Zhang, Chao Yi, and Yan Dong Zhao. "Multi-Path Relay Selection Based on Radio and Television Business." Advanced Materials Research 756-759 (September 2013): 1883–88. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.1883.

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This paper presents a relay selection method for radio and television business, this method uses nodes time-delay and power information, obtains the value of network interrupt as decision threshold, then selects the relay node. At same time this paper proposes an optimal relay selection strategy which can minimize the network interrupt probability combination with power distributionMulti-Path Relay Routing Protocol, this protocol can change the appropriate route path according to the dynamic network. Simulation results show that this protocol can extend cells coverage area, reduce time-delay a

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Sharma, Upasana, Rohit Sharma, Meenakshi Awasthi, and Lokesh Varshney. "Error Mitigation in Noma for Underlay CR Networks with Imperfect Successive Interference Cancellation." International Journal of Electrical and Electronics Research 12, no. 2 (2024): 617–22. http://dx.doi.org/10.37391/ijeer.120238.

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This study examines the outage probability in a partial relay selection relaying network, an underlay cognitive radio (CR) network, and a non-orthogonal multiple access (NOMA) system. NOMA, which consists of K half-duplex Decode and Forward (DF) relays, is used in the secondary network. These relays are used to enable data transmission to secondary users (SUs) from the secondary base station (SBS). By establishing mathematical formulations, it is feasible to quantify the outage probability that SUs experience while accounting for imperfect successive interference cancellation (i-SIC). The pape

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Messadi, Oussama, Aduwati Sali, Vahid Khodamoradi, et al. "Optimal Relay Selection Scheme with Multiantenna Power Beacon for Wireless-Powered Cooperation Communication Networks." Sensors 21, no. 1 (2020): 147. http://dx.doi.org/10.3390/s21010147.

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Unlike the fixed power grid cooperative networks, which are mainly based on the reception reliability parameter while choosing the best relay, the wireless-powered cooperative communication network (WPCCN) and in addition to the reception reliability the transmission requirement consideration is important for relay selection schemes. Hence, enabling efficient transmission techniques that address high attenuation of radio frequency (RF) signals according to the distance without increasing the total transmission power is an open issue worth studying. In this relation, a multiantennas power beaco

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Lu, Jingwei, Rongpeng Liu, Yawei Wang, Ziyang Wang, and Hongzhan Liu. "Performance Study of FSO/THz Dual-Hop System Based on Cognitive Radio and Energy Harvesting System." Electronics 13, no. 23 (2024): 4656. http://dx.doi.org/10.3390/electronics13234656.

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In order to address the problems of low spectrum efficiency in current communication systems and extend the lifetime of energy-constrained relay devices, this paper proposes a novel dual-hop free-space optical (FSO) system that integrates cognitive radio (CR) and energy harvesting (EH). In this system, the source node communicates with two users at the terminal via FSO and terahertz (THz) hard-switching links, as well as a multi-antenna relay for non-orthogonal multiple access (NOMA). There is another link whose relay acts as both the power beacon (PB) in the EH system and the primary network

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Bogucki, Jan, and Ewa Wielowieyska. "Reliability of line-of-sight radio-relay systems." Journal of Telecommunications and Information Technology, no. 1 (March 30, 2006): 87–92. http://dx.doi.org/10.26636/jtit.2006.1.352.

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The modern radio transmission systems are specifically designed for catching principally two main objectives: on one side to provide a radio solution for long distance where large configurations are required to fulfill the high capacity transmissions needs, on the other side to guarantee link quality as high as possible. The availability of a radio-relay system is dependent upon many factors and particularly upon: the reliability of equipment and propagation conditions. The article describes the wave propagation and equipment that determine the performance of a radio-relay path. National Insti

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Van Nguyen, Minh-Sang, Dinh-Thuan Do, and Miroslav Voznak. "Improving Performance of Far Users in Cognitive Radio: Exploiting NOMA and Wireless Power Transfer." Energies 12, no. 11 (2019): 2206. http://dx.doi.org/10.3390/en12112206.

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In this paper, we examine non-orthogonal multiple access (NOMA) and relay selection strategy to benefit extra advantage from traditional cognitive radio (CR) relaying systems. The most important requirement to prolong lifetime of such network is employing energy harvesting in the relay to address network with limited power constraint. In particular, we study such energy harvesting CR-NOMA using amplify-and-forward (AF) scheme to improve performance far NOMA users. To further address such problem, two schemes are investigated in term of number of selected relays. To further examine system perfo

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Hamouda, Soumaya, and Tarek Bejaoui. "Enhanced Relay Selection and Scheduling for Better Load Balancing in Multi-Hop Networks." International Journal of Business Data Communications and Networking 8, no. 4 (2012): 17–31. http://dx.doi.org/10.4018/jbdcn.2012100102.

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Relaying technology is likely to bring real progress to the next generation cellular networks due to its capability of boosting the system capacity and coverage. However, despite recent advances in relay deployment, some challenging problems still remain such as radio resource allocation and relay selection. The authors investigate both relay selection and scheduling strategy in order to improve the system radio capacity as well as the network load balancing. They propose a new path selection scheme based on the radio channel quality and the relay station load criteria. Performance analysis sh

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Li, Suoping, Wenwu Liang, Vicent Pla, Nana Yang, and Sa Yang. "Two-Stage Adaptive Relay Selection and Power Allocation Strategy for Cooperative CR-NOMA Networks in Underlay Spectrum Sharing." Applied Sciences 11, no. 21 (2021): 10433. http://dx.doi.org/10.3390/app112110433.

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In this paper, we consider a novel cooperative underlay cognitive radio network based on non-orthogonal multiple access (CR-NOMA) with adaptive relay selection and power allocation. In secondary networks, dedicated relay assistance and user assistance are used to achieve communication between the base station and the far (and near) user. Here, a two-stage adaptive relay selection and power allocation strategy is proposed to maximize the achievable data rate of the far user while ensuring the service quality of near user. Furthermore, the closed-form expressions of outage probability of two sec

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Mahajan, Mayuresh. "Energy Saving System using a PIR Sensor for Classroom Monitoring System." International Journal for Research in Applied Science and Engineering Technology 11, no. 6 (2023): 1948–54. http://dx.doi.org/10.22214/ijraset.2023.53977.

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Abstract: The work gives a report about the design of an energy saving system using a Passive Infrared Radio sensor to switch ‘off’ fan and light circuits in the classroom in the absence of students. When a student enters the classroom, the Infrared energy emitted from the living body is focused by the Fresnel lens segment and the PIR sensors activate and give to the microcontroller which acts as power saving device according to the relay. When motion is detected the relays trigger and switch the fan and light ‘on’ and after ten minutes to switch ‘off’ the fan and light when motion has not bee

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Yang, Ping, Weichao Kuang, and Shanjin Wang. "Relay Selection for Dual-Hop Cooperative Ambient Backscatter Communication Systems." Sensors 23, no. 13 (2023): 5791. http://dx.doi.org/10.3390/s23135791.

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Previous works only focus on the optimization design for the dual-hop cooperative ambient backscatter communication (AmBC) system with single-relay selection. The impact of relay selection on the outage performance of dual-hop cooperative AmBC systems is still missing. Motivated by this, in this paper, we investigate the outage performance of a dual-hop cooperative AmBC system with single-relay selection, where the backscatter link shares the receiver with the cellular link and the harmful direct-link interference (DLI) is mitigated by using successive interference cancellation (SIC). In the s

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Zhang, Xiwen, Shanghong Zhao, Yuan Wang, et al. "Performance Analysis of Multiple UAV-Based Hybrid Free-Space Optical/Radio Frequency Aeronautical Communication System in Mobile Scenarios." Drones 8, no. 12 (2024): 729. https://doi.org/10.3390/drones8120729.

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Free-space optical (FSO) communication with unmanned aerial vehicles (UAVs) as relays is a promising technology for future aeronautical communication systems. In this paper, a multiple UAV-based aeronautical communication system is proposed, wherein a hybrid FSO/radio frequency (RF) link is established to connect the Airborne Warning and Control System (AWACS) with the mobile ground station (GS). Initially, we consider the velocity variance of both AWACS and the mobile GS, along with the influence of the Doppler effect. Furthermore, four relay selection modes are proposed, and exact closed exp

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Luchinin, A. S., I. V. Malygin, S. I. Starikov, V. A. Chechetkin, A. A. Shegal, and S. A. Belkov. "Mechanisms of ensuring the accuracy and reliability of data transmission over a radio channel using relay technology and their implementation on transceivers with LoRa modulation." Ural Radio Engineering Journal 7, no. 2 (2023): 191–217. http://dx.doi.org/10.15826/urej.2023.7.2.006.

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The article is devoted to a detailed description of the algorithms of the operation of the relay-race data transmission system over a radio channel, which ensure high reliability of transporting the results of monitoring the operation of extended objects to the central control panel. The feature of the system is operation at a low power level of transmitters, energy efficiency, which ensures a long-term operation without maintenance, the ability to replace failed elements quickly without stopping the entire system, mobility — quick installation and start-up of the system. Energy efficiency and

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Tran, Huu Q., Nguyen Trong Duy, and Huynh Phan Hieu Nghia. "Collaborative Relay Radio Network Using Reconfigurable Intelligent Surface." ICST Transactions on Mobile Communications and Applications 7, no. 3 (2022): e2. http://dx.doi.org/10.4108/eetmca.v7i3.2716.

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In this paper, we have studied a model of a relay radio network system using Reconfigurable Intelligent Surface (RIS). Specifically, we used a relay network that uses RIS when there is an extra direct link from the Source (S) to the Destination (D). Next, an approximate closed-form expressions of the Outage Probability (OP) and Ergodic Capacity (EC) are considered. Based on the simulation results of OP and EC, the results show that our proposed system is more optimal than the system using supported RIS without direct link and the system without using RIS. In addition, changing the number of th

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Kuwabara, Moriji. "The Start of Microwave Radio-relay System in Japan." Journal of the Institute of Image Information and Television Engineers 59, no. 6 (2005): 852–55. http://dx.doi.org/10.3169/itej.59.852.

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Lu, Weidang, Guangzhe Liu, Peiyuan Si, Guanghua Zhang, Bo Li, and Hong Peng. "Joint Resource Optimization in Simultaneous Wireless Information and Power Transfer (SWIPT) Enabled Multi-Relay Internet of Things (IoT) System." Sensors 19, no. 11 (2019): 2536. http://dx.doi.org/10.3390/s19112536.

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The internet of things (IoT) is becoming more indispensable in modern society as the further development and maturity of information technology progresses. However the exponential growth of IoT devices leads to severe energy consumption. As a technology with broad application prospects, simultaneous wireless information and power transfer (SWIPT) enables IoT devices to harvest energy from receiving radio frequency (RF) signals while ensuring information transmission. In this paper, we investigate the transmission rate optimization problem for a dual-hop multi-relay IoT system, where a decode-a

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Hoang, Tran Manh, Nguyen Le Van, Ba Cao Nguyen, and Le The Dung. "On the Performance of Energy Harvesting Non-Orthogonal Multiple Access Relaying System with Imperfect Channel State Information over Rayleigh Fading Channels." Sensors 19, no. 15 (2019): 3327. http://dx.doi.org/10.3390/s19153327.

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In this paper, we propose a non-orthogonal multiple access (NOMA) relaying system, where a source node communicates simultaneously with multiple users via the assistance of the best amplify-and-forward (AF) relay. The best relay is selected among N relays which are capable of harvesting the energy from radio frequency (RF) signals. We analyze the performance of the proposed NOMA relaying system in the conditions of imperfect channel state information (CSI) and Rayleigh fading by deriving the exact expressions of the outage probability (OP) and the approximate expression of the ergodic capaciti

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Zhang, Chao Yi, Mu Qing Wu, Lin Lin Luan, and Chun Xiu Xu. "Based on Time-Delay and Bandwidth Relay Selection Algorithm for Radio and Television Services." Advanced Materials Research 748 (August 2013): 1009–14. http://dx.doi.org/10.4028/www.scientific.net/amr.748.1009.

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Proposed a relay routing method for Radio and TV services, the method through obtaining the nodes time-delay and power information, obtained the value of the system interrupt decisions, and as a decision threshold to select the relay node. While in consideration of link priorities and fairness, designed a relay routing protocol that can dynamically change the route when the network changed. Simulation results show that this protocol can be expanded coverage, reduced communication blind spots, increase system throughput and enhance the quality of service.

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Thanh-Luan, Nguyen, and Do Dinh-Thuan. "Investigation on energy harvesting enabled device-to-device networks in presence of co-channel interference." TELKOMNIKA Telecommunication, Computing, Electronics and Control 19, no. 1 (2021): pp. 27∼35. https://doi.org/10.12928/TELKOMNIKA.v19i1.16138.

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Energy harvesting from ambient radio-frequency (RF) sources has been a novel approach for extending the lifetime of wireless networks. In this paper, a cooperative device-to-device (D2D) system with the aid of energy-constrained relay is considered. The relays are assumed to be able to harvest energy from information signal and cochannel interference (CCI) signals broadcasted by nearby traditional cellular users and forward the source’s signal to its desired destination (D2D user) utilizing amplify-andforward (AF) relaying protocol. Time switching protocol (TSR) and power splitting proto

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Zhao, Long, Tao Liang, and Kang An. "Performance Optimization of Hybrid Satellite-Terrestrial Relay Network Based on CR-NOMA." Sensors 20, no. 18 (2020): 5177. http://dx.doi.org/10.3390/s20185177.

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The non-orthogonal multiple access (NOMA) scheme realizes the transmission of multiple user signals at the same time and frequency resource block through power domain multiplexing, which improves the system transmission rate and user fairness. In this paper, we propose a joint relay-and-antenna selection scheme based on the cognitive radio scenario. This scheme can achieve the maximum communication rate of the secondary user when the primary user maintains the optimal outage performance. In the considered system both terrestrial relays and users are deployed with multi-antenna configurations a

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Nguyen, Hong Nhu, Ho Van Cuu, Phan Van-Duc, N. Nguyen Tan, Voznak Miroslav, and Zdralek Jaroslav. "Outage performance of underlay cognitive radio networks over mix fading environment." International Journal of Electrical and Computer Engineering (IJECE) 11, no. 3 (2021): 2019–26. https://doi.org/10.11591/ijece.v11i3.pp2019-2026.

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In this paper, the underlay cognitive radio network over mix fading environment is presented and investigated. A cooperative cognitive system with a secondary source node S, a secondary destination node D, secondary relay node Relay, and a primary node P are considered. In this model system, we consider the mix fading environment in two scenarios as Rayleigh/ Nakagami-m and Nakagami-m/Rayleigh Fading channels. For system performance analysis, the closed-form expression of the system outage probability (OP) and the integral-formed expression of the ergodic capacity (EC) are derived in connectio

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Hong Nhu, Nguyen, Cuu_Ho Van, Van-Duc Phan, Tan N. Nguyen, Miroslav Voznak, and Jaroslav Zdralek. "Outage performance of underlay cognitive radio networks over mix fading environment." International Journal of Electrical and Computer Engineering (IJECE) 11, no. 3 (2021): 2019. http://dx.doi.org/10.11591/ijece.v11i3.pp2019-2026.

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In this paper, the underlay cognitive radio network over mix fading environment is presented and investigated. A cooperative cognitive system with a secondary source node S, a secondary destination node D, secondary relay node Relay, and a primary node P are considered. In this model system, we consider the mix fading environment in two scenarios as Rayleigh/Nakagami-m and Nakagami-m/Rayleigh Fading channels. For system performance analysis, the closed-form expression of the system outage probability (OP) and the integral-formed expression of the ergodic capacity (EC) are derived in connection

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Moorhead, Simon. "Australian East-West Radio Relay System Revisited: Thermal Design of Repeater Shelters." Journal of Telecommunications and the Digital Economy 12, no. 2 (2024): 155–65. http://dx.doi.org/10.18080/jtde.v12n2.975.

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The Journal revisits two historic papers from 1971 covering the thermal design and environmental controls in repeater shelters of the Australian East-West radio relay system from Northam in Western Australia to Port Pirie in South Australia.

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VARMA, ASHWINI KUMAR, BITTU KUMAR, AKELLA RAMAKRISHNA, and DEBJANI MITRA. "MULTI-HOP RELAY SELECTION FOR COOPERATIVE SENSING IN COGNITIVE RADIO NETWORKS." REVUE ROUMAINE DES SCIENCES TECHNIQUES — SÉRIE ÉLECTROTECHNIQUE ET ÉNERGÉTIQUE 69, no. 2 (2024): 237–42. http://dx.doi.org/10.59277/rrst-ee.2024.2.20.

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Spectrum sensing is one of the essential blocks of the cognitive radio (CR) system. Cooperative spectrum sensing (CSS) enhances sensing performance by exchanging information among secondary users (SUs). The paper addresses a situation where some SUs cannot communicate their local information with the fusion center (FC) due to real-time circumstances, i.e., shadowing, large distances, increased signal interference, etc. The issue can be resolved by introducing relay nodes to assist such SUs in transmitting local information to the corresponding destination (FC), making relay selection an essent

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Ilchenko, Mikhail E., S. Ye Kuzmin, T. N. Narytnik, Anatoly Ivanovich Fisun, Oleg I. Belous, and V. N. Radzikhovsky. "TRANSCEIVER FOR 130-134 GHZ BAND DIGITAL RADIO RELAY SYSTEM." Telecommunications and Radio Engineering 72, no. 17 (2013): 1623–38. http://dx.doi.org/10.1615/telecomradeng.v72.i17.70.

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Dwiansyah, Rafif Okta, and Dedi Ary Prasetya. "SMART HOME SYSTEM WITH RADIO FREQUENCY USING BLYNK APPLICATION." Emitor: Jurnal Teknik Elektro 22, no. 2 (2022): 177–84. http://dx.doi.org/10.23917/emitor.v22i2.17359.

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Over time, technology has been embedded in our daily lives and will develop more and more rapidly. Because everything can facilitate us in activities, especially in a house. But the problem arises how we manage and control electronic equipment efficiently and comfortably. In this study, an intelligent control system based on IoT (Internet of Things) technology has been suggested to solve the above problem, namely with a smart home control system based on IoT (Internet of Things) with a radio frequency of 433 MHz as a command to send and be forwarded to several receivers on each - each relay us

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Liang, Wei Ping, and Zhen Gang Zheng. "Wireless Communication Technique Applied to Coal-Transport System." Advanced Materials Research 542-543 (June 2012): 1311–15. http://dx.doi.org/10.4028/www.scientific.net/amr.542-543.1311.

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The traditional coal-transport system for the power plant is a semiautomatic system based on relay and manual way.The belt is often deviated and ripped due to the large range of coal-transport system.There are interpreted the function of wireless telecontrol used on coal-transport system , the system building up and the radio information for applying this technique.

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Jessica Indrayani, Janice, Nyoman Pramaita Nyoman Pramaita, and I. Made Oka Widyantara. "SISTEM NOTIFIKASI SWITCH BERBASIS TEKNOLOGI WIRELESS." Jurnal SPEKTRUM 8, no. 1 (2021): 197. http://dx.doi.org/10.24843/spektrum.2021.v08.i01.p22.

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This research develops a remote switch notification system by utilizing radio waves. This system will usethe RF433 module and RF315 module as the transmission medium, the HT12E module as the encoderand the HT12D module as the decoder. The working principle of the system is that the sending partsends a signal when the voltage is applied via a push button, then the switch is sent to the part of theroom and activate the relay. Then in the relay there is also an encoder that will recode the data on therelay that the relay is active and resend the data to false senders so that the LED as notificati

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Latka, Deepika, Mona Aggarwal, and Swaran Ahuja. "Outage Probability Analysis and Altitude Optimization of a UAV-Enabled Triple-Hop Mixed RF-FSO-Based Wireless Communication System." Photonics 11, no. 12 (2024): 1145. https://doi.org/10.3390/photonics11121145.

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In this paper, we present the evaluation of network parameters for the unmanned aerial vehicle (UAV)-enabled triple-hop mixed RF/FSO-based wireless communication system, where one relay is a fixed relay and the second relay is a UAV which acts as decode-and-forward relay for communication from the base station (B) to the multiple mobile users (Mi), i∈{1,2⋯N}. The first hop from B to fixed relay (R1) is the radio frequency (RF) link modeled using α−κ−μ fading distribution, the second hop from the relay R1 to the UAV relay (R2) is a free space optics (FSO) link modeled using Gamma-Gamma fading,

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Авдєєнко, Гліб Леонідович, Сергій Георгійович Бунін та Теодор Миколайович Наритник. "ТЕРАГЕРЦОВІ ТЕХНОЛОГІЇ В ТЕЛЕКОМУНІКАЦІЙНИХ СИСТЕМАХ. ЧАСТИНА 1. ОБҐРУНТУВАННЯ ЧАСТОТНОГО ДІАПАЗОНУ, ПРОЕКТУВАННЯ ФУНКЦІОНАЛЬНИХ ВУЗЛІВ ТЕЛЕКОМУНІКАЦІЙНИХ СИСТЕМ ТЕРАГЕРЦОВОГО ДІАПАЗОНУ". Aerospace technic and technology, № 4 (14 жовтня 2018): 72–91. http://dx.doi.org/10.32620/aktt.2018.4.10.

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The article presented results of researches conducted by the team of authors devoted to the possibilities of creation for the first time in Ukraine the real prerequisites for solving the fundamental problem of constructing digital telecommunication systems with the use of terahertz technologies. The necessity of transition to the use of the terahertz frequency range substantiated during the deployment of future telecommunication systems of ultra-high bandwidth. The analysis of characteristics of the path of signal propagation and determination of signal losses in conditions of operation of the

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Du, Guanyao, Ke Xiong, and Zhengding Qiu. "Outage Analysis of Cooperative Transmission with Energy Harvesting Relay: Time Switching versus Power Splitting." Mathematical Problems in Engineering 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/598290.

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This paper investigates the multiuser transmission network with an energy harvesting (EH) cooperative relay, where a source transmits independent information to multiple destinations with the help of an energy constrained relay. The relay can harvest energy from the radio frequency (RF) signals transmitted from the source, and it helps the multiuser transmission only by consuming the harvested energy. By adopting the time switching and the power splitting relay receiver architectures, we firstly propose two protocols, the time switching cooperative multiuser transmission (TSCMT) protocol and t

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Liu, Xuewen, Shuman Huang, Kaisa Zhang, et al. "Joint Resource Allocation and Drones Relay Selection for Large-Scale D2D Communication Underlaying Hybrid VLC/RF IoT Systems." Drones 7, no. 9 (2023): 589. http://dx.doi.org/10.3390/drones7090589.

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Relay-aided Device-to-Device (D2D) communication combining visible light communication (VLC) with radio frequency (RF) is a promising paradigm in the internet of things (IoT). Static relay limits the flexibility and maintaining connectivity of relays in Hybrid VLC/RF IoT systems. By using a drone as a relay station, it is possible to avoid obstacles such as buildings and to communicate in a line-of-sight (LoS) environment, which naturally aligns with the requirement of VLC Systems. To further support the application of VLC in the IoT, subject to the challenges imposed by the constrained covera

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Ren, Guo Can. "The Application of Trellis Coded Modulation in Cooperative Communication Systems." Advanced Materials Research 267 (June 2011): 652–57. http://dx.doi.org/10.4028/www.scientific.net/amr.267.652.

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In this work, we first assume that the relay node and the destination are connected by the error-free backbond. This scenario is often seen in the situation of handover in the uplink in 3G system, where the signals of a user is combined in either the base station or in the radio network controller . Under this assumption, the decoding metric is derived. Unlike, the decoding metric in this work is based on the joint probability of the received signal at the relay node and the destination rather than the conditional probability of received signal at the destination given the decoding information

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Maity, Santi P., and Dibyajnan Basak. "Power Allocation in OFDM Cognitive Radio System in Presence of Relay." Procedia Engineering 30 (2012): 1029–36. http://dx.doi.org/10.1016/j.proeng.2012.01.960.

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Zhao, Nan, Minghu Wu, Wei Xiong, and Cong Liu. "Cooperative Communication in Cognitive Radio Networks under Asymmetric Information: A Contract-Theory Based Approach." International Journal of Distributed Sensor Networks 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/676195.

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By exploiting the spatial diversity of multiple wireless nodes, cooperative communication technique is a promising technique for spectrum sharing to improve spectrum efficiency. In this paper, the incentive issue between relay nodes’ (RNs’) service and source’s relay selection is investigated in the presence of the asymmetric information scenario. Multiuser cooperative communication is modelled as a labour market, where the source designs a contract and each relay node decides to select a contract item according to hidden information in order to obtain the best profit. The optimal contract des

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Varade, Pradip, Akanksha Wabale, Ravinder Yerram, and Rupesh Jaiswal. "Throughput Maximization of Cognitive Radio Multi Relay Network with Interference Management." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 4 (2018): 2230. http://dx.doi.org/10.11591/ijece.v8i4.pp2230-2238.

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<span>In this paper, an Orthogonal Frequency Division Multiplexing (OFDM) based cognitive multi relay network is investigated to maximize the transmission rate of the cognitive radio (CR) with enhanced fairness among CR users with interference to the primary users (PUs) being managed below a certain threshold level. In order to improve the transmission rate of the CR, optimization of the subcarrier pairing and power allocation is to be carried out simultaneously. Firstly joint optimization problem is formulated and Composite Genetic and Ordered Subcarrier Pairing (CGOSP) algorithm is pro

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Pradip, Varade, Wabale Akanksha, Yerram Ravinder, and Jaiswa Rupesh. "Throughput Maximization of Cognitive Radio Multi Relay Network with Interference Management." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 4 (2018): 2230–38. https://doi.org/10.11591/ijece.v8i4.pp2230-2238.

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In this paper, an Orthogonal Frequency Division Multiplexing (OFDM) based cognitive multi relay network is investigated to maximize the transmission rate of the cognitive radio (CR) with enhanced fairness among CR users with interference to the primary users (PUs) being managed below a certain threshold level. In order to improve the transmission rate of the CR, optimization of the subcarrier pairing and power allocation is to be carried out simultaneously. Firstly joint optimization problem is formulated and Composite Genetic and Ordered Subcarrier Pairing (CGOSP) algorithm is proposed to sol

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