Journal articles: 'Wireless communication systems Relay control systems'

1

Altubaishi, Essam Saleh. "Effect of controlling maximum-SNR-based relay selection strategy in cooperative wireless communication systems." Indonesian Journal of Electrical Engineering and Computer Science 22, no. 1 (April 1, 2021): 335. http://dx.doi.org/10.11591/ijeecs.v22.i1.pp335-341.

Full text

Abstract:

Relay selection strategy under maximum-signal-to-noise ratio (MAX-SNR) criterion was proven to maximize performance but at the expense of losing fairness among the cooperative relays. In this work, the effect of controlling the MAX-SNR criterion on the spectral efficiency of cooperative wireless communication system with adaptive modulation is investigated. Specifically, the probability density function (PDF) of the end-to-end SNR for the considered system is derived when the controlled selection criterion is considered. Base on that PDF, the average spectral efficiency is then derived and investigated. The results show how the spectral efficiency of the system deteriorates as controlling the selection of a relay. Furthermore, the results of Monte Carlo simulation validate the derived expression.

APA, Harvard, Vancouver, ISO, and other styles

2

Zhang, Kewang, Qizhao Wu, and Xin Li. "Relay participated–new-type building energy management system: An energy-efficient routing scheme for wireless sensor network–based building energy management systems." International Journal of Distributed Sensor Networks 13, no. 1 (January 2017): 155014771668361. http://dx.doi.org/10.1177/1550147716683613.

Full text

Abstract:

With the development of wireless sensor networks, many building energy management systems are getting to adopt wireless sensor network as their communication infrastructure. However, the existing wireless sensor network protocols cannot satisfy the energy-saving demand of building energy management systems. Considering the characteristics of the building energy management system wireless sensor networks, a novel energy-efficient routing scheme is proposed called relay participated–new-type building energy management system. Nodes in the building energy management system wireless sensor networks are divided into two types: energy-limited nodes (battery powered) and energy-unlimited nodes (main powered, solar charger, or heat energy powered). Relay participated–new-type building energy management system allows energy-unlimited nodes to temporarily receive packets that are routed to a nearby energy-limited nodes. In this way, time synchronization for low-power sleep at media access control layer is no longer required, which reduces the delay and control overhead at media access control layer dramatically. Relay participated–new-type building energy management system reduces energy usage of energy-limited nodes and extend the lifetime of wireless sensor networks in new-type building energy management systems. Simulation results show that the relay participated–new-type building energy management system protocol significantly improves energy efficiency of limited energy nodes and reduces latency as compared to ad hoc on-demand distance vector–sensor medium access control and low-energy adaptive clustering hierarchy.

APA, Harvard, Vancouver, ISO, and other styles

3

Kakria, Arvind, and Trilok Chand Aseri. "An Efficient Distributed Single-hop Relay Supporting (EDSRS) MAC Protocol for Wireless Sensor Networks." International Journal of Sensors, Wireless Communications and Control 9, no. 2 (October 25, 2019): 153–64. http://dx.doi.org/10.2174/2210327908666180801125223.

Full text

Abstract:

Background & Objective: Wireless communication has immensely grown during the past few decades due to significant demand for mobile access. Although cost-effective as compared to their wired counterpart, maintaining good quality-of-service (QoS) in these networks has always remained a challenge. Multiple-input Multiple-output (MIMO) systems, which consists of multiple transmitter and receiver antennas, have been widely acknowledged for their QoS and transmit diversity. Though suited for cellular base stations, MIMO systems are not suited for small-sized wireless nodes due to their hardware complexity, cost, and increased power requirements. Cooperative communication that allows relays, i.e. mobile or fixed nodes in a communication network, to share their resources and forward other node’s data to the destination node has substituted the MIMO systems nowadays. To harness the full benefit of cooperative communication, appropriate relay node selection is very important. This paper presents an efficient single-hop distributed relay supporting medium access control (MAC) protocol (EDSRS) that works in the single-hop environment and improves the energy efficiency and the life of relay nodes without compensating the throughput of the network. Methods: The protocol has been simulated using NS2 simulator. The proposed protocol is compared with energy efficient cooperative MAC protocol (EECOMAC) and legacy distributed coordination function (DCF) on the basis of throughput, energy efficiency, transmission delay and an end to end delay with various payload sizes. Result and Conclusion: The result of the comparison indicates that the proposed protocol (EDSRS) outperforms the other two protocols.

APA, Harvard, Vancouver, ISO, and other styles

4

Waqar, Omer, and Raviraj Adve. "On the Throughput of Wireless Powered Communication Systems With a Multiple Antenna Bidirectional Relay." IEEE Wireless Communications Letters 8, no. 3 (June 2019): 941–44. http://dx.doi.org/10.1109/lwc.2019.2900654.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Zhang, Chensi, Jianhua Ge, Fengkui Gong, Yancheng Ji, and Jinxi Li. "Improving Physical-Layer Security for Wireless Communication Systems Using Duality-Aware Two-Way Relay Cooperation." IEEE Systems Journal 13, no. 2 (June 2019): 1241–49. http://dx.doi.org/10.1109/jsyst.2018.2864778.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Mumtaz, Shahid, Le Thanh Tu, Kazi Saidul, and Atílio Gameiro. "Calibration and Evaluation of Fixed and Mobile Relay-Based System Level Simulator." Journal of Computer Systems, Networks, and Communications 2010 (2010): 1–14. http://dx.doi.org/10.1155/2010/149257.

Full text

Abstract:

Future wireless communication systems are expected to provide more stable and higher data rate transmissions in the whole OFDMA networks, but the mobile stations (MSs) in the cell boundary experience poor spectral efficiency due to the path loss from the transmitting antenna and interference from adjacent cells. Therefore, satisfying QoS (Quality of Service) requirements of each MS at the cell boundary has been an important issue. To resolve this spectral efficiency problem at the cell boundary, deploying relay stations has been actively considered. As multihop/relay has complex interactions between the routing and medium access control decisions, the extent to which analytical expressions can be used to explore its benefits is limited. Consequently, simulations tend to be the preferred way of assessing the performance of relays. In this paper, we evaluate the performance of relay-assisted OFDMA networks by means of system level simulator (SLS). We consistently observed that the throughput is increased and the outage is decreased in the relay-assisted OFDMA network, which is converted to range extension without any capacity penalty, for the realistic range of values of the propagation and other system parameters investigated.

APA, Harvard, Vancouver, ISO, and other styles

7

Yao, Jin, Jia Ye, Gaofeng Pan, Yiyuan Xie, and Quanyuan Feng. "Relay selection schemes in threshold DF cooperative systems with wireless power transfer." Journal of the Franklin Institute 357, no. 8 (May 2020): 5091–109. http://dx.doi.org/10.1016/j.jfranklin.2020.04.005.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Demir, Beşir, Ahmet Tumay, Mehmet Efe Ozbek, and Enver Cavus. "Design of a system solution that modernizes legacy supervisory control and data acquisition systems as an early detection system." Measurement and Control 51, no. 7-8 (June 19, 2018): 205–12. http://dx.doi.org/10.1177/0020294018782087.

Full text

Abstract:

Background In industrial disasters, early detection of problems and crisis management are critical for saving the lives of people and reducing the impact of disasters. Purpose In this study, we design a special gateway system that bridges the gap between different communication protocols and enables legacy supervisory control and data acquisition systems to function early detection systems for potential industrial disasters. Methods The system uses a new queue mechanism to substantially improve the problem of data loss found in conventional supervisory control and data acquisition systems and utilizes identification (ID) prioritization to enable early detection of problems. The proposed system is implemented and tested on a Linux-based, 3G-capable Modbus gateway system. Modbus is used as the communication protocol and 3G technology is utilized to provide high-speed wireless data transfer components. The Modbus gateway device uses an ARM-based EP9302 processor and has digital input/output, relay outputs, and RS485 outputs. Conclusion This study is significant as it is the first work to show the application of the priority query execution method for Modbus gateway devices.

APA, Harvard, Vancouver, ISO, and other styles

9

Pickering, A. K., Richard Hull, J. E. Hawk, Arindam Phani, C. W. Van Neste, and Thomas Thundat. "Quasi-wireless surface power and control for battery-free robotics." Wireless Power Transfer 2, no. 2 (September 2015): 134–42. http://dx.doi.org/10.1017/wpt.2015.15.

Full text

Abstract:

Current robotic systems have achieved great sophistication in kinematic motion, control, and neural processing. One of the most challenging limitations imposed on modern robotics is the portable power source needed to sustain tether-free operation. Energy storage devices such as batteries and combustion engines may be heavy, require a great deal of space, and invariably have a finite energy capacity. Methods to control such devices may also impose limitations as most robotic systems rely on either tethered or radiative communication. The unavoidable repercussion of these limitations is the ultimate reduction of mobility and operation time to achieve specific tasks. To address these challenges, we apply our quasi-wireless powering methodology to show the operation of two robotic devices over a 1×1 m2surface. Both power and control signals are transmitted simultaneously, producing seamless storage-free functionality over the entire area with a communication technique that is not line-of-sight or radiation dependent. We demonstrate an average power transfer efficiency of 93% using commercially available toy robots and discuss parameters relating to the power and communication performance.

APA, Harvard, Vancouver, ISO, and other styles

10

Saiko, Volodymyr, Volodymyr Nakonechnyi, Serhii Dakov, and Serhii Tolyupa. "TERACHERTSOVYI CHANNEL RADIODOSTUPU FOR COMPLEX SYSTEM WITHOUT SYSTEMS THE BELL OF THE OBJECTS." Cybersecurity: Education, Science, Technique, no. 1 (2018): 17–25. http://dx.doi.org/10.28925/2663-4023.2018.1.1725.

Full text

Abstract:

One of the perspective use of THz (submillimeter) technologies is the wireless communication systems. In particular, it will lead to development of the submillimeter/THz band devices with brand new size, interference immunity and energy efficiency, for high speed video signal broadcasting, line of sight relay, for 5G cell phone transport networks, high precision radars for small size, high velocity target detection and tracking, and hidden object detection radiometric systems. Nowadays, the research of such wireless systems is focused on increase of communication channel bandwidth using superbroadband signals, which occupy all the THz band. However, it’s worth to mention, that in many perspective applications of 5th generation networks, the range has more important role, than the data transmission speed. The goal of the article is the increase of communication center’s information efficiency by the development of innovative solution for construction of the wireless broadband subscriber channel for information resource access using THz band, which provides greater efficiency in the channel’s range and bit rate. The results of THz-band wireless broadband access technical solution analysis are being provided here. The implementation of broadband access requires designating significant informational resource amount per subscriber, which, if the designated resource amount is not enough, leads to decrease in efficiency in service providing. Today’s lack of transmitter/receiver hardware of decent cost, when using unlicensed THz frequencies in backhaul network channels, leads to significant decrease of backhaul network channel length, which means decrease of the network zone size. Therefore, to avoid these flaws, the new technical solution for every subscriber’s bit rate increase, the subscriber amount increase on the territory covered by the access point, and the service coverage territory expansion possibility, is being provided here. During the THz-band channel broadcast system deployment process, one of the main issue is the channel and time resource distribution between the wireless communication system’s different sectors (directions), which is due to the change of traffic quality and amount. A generalized channel and time resource amount prediction algorithm is being provided for high efficiency wireless access channel. The control of such system can be done similarly to the server network. Territorial access point location allows: the increase of data amount being provided to the covered territory subscribers; the possibility to hold energy resource (energy per bit), which means the backhaul channel length is being preserved; the possibility of covered territory size expansion. Generally, the developed solution allows to increase the new generation wireless system data use efficiency, to increase the distance to remote subscriber network in some times, depending on the network access node’s input data stream ratio, and to increase the amount of wireless access points.

APA, Harvard, Vancouver, ISO, and other styles

11

Ayedi, Mariem, Esraa Eldesouky, and Jabeen Nazeer. "Energy-Spectral Efficiency Optimization in Wireless Underground Sensor Networks Using Salp Swarm Algorithm." Journal of Sensors 2021 (January 15, 2021): 1–16. http://dx.doi.org/10.1155/2021/6683988.

Full text

Abstract:

Achieving high data rate transmission is critically constrained by green communication metrics in Wireless Sensor Networks (WSNs). A unified metric ensuring a successful compromise between the energy efficiency (EE) and the spectral efficiency (SE) is, then, an interesting design criterion in such systems. In this paper, we focus on EE-SE tradeoff optimization in Wireless Underground Sensor Networks (WUSNs) where signals penetrate through a challenging lossy soil medium and nodes’ power supply is critical. Underground sensor nodes gather and send sensory information to underground relay nodes which amplify-and-retransmit received signals to an aboveground sink node. We propose to optimize source and relay powers used for each packet transmission using an efficient recent metaheuristic optimization algorithm called Salp Swarm Algorithm (SSA). Thus, the optimal source and relay transmission powers, which maximize the EE-SE tradeoff under the maximum allowed transmission powers and the initial battery capacity constraints, are obtained. Further, we study the case where the underground medium properties are dynamic and change from a transmission to another. For this situation, we propose to allocate different maximum node powers according to the soil medium conditions. Simulation results prove that our proposed optimization achieves a significant EE-SE tradeoff and prolongs the network’s lifetime compared to the fixed allocation node power scheme. Additional gain is obtained in case of dynamic medium conditions.

APA, Harvard, Vancouver, ISO, and other styles

12

Du, Qinghe, Nan Lu, Li Sun, Xuelin Zhang, and Bo Sun. "Robust Relay in Narrow-Band Communications for Ubiquitous IoT Access." Journal of Sensors 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/9270907.

Full text

Abstract:

We propose a robust wireless relay scheme in narrow-band communications for IoT access, which matches the typical features of IoT often carrying relatively low data rate with limited bandwidth. This framework is towards offering robustness in QoS guarantees with emphases on security and/or reliability, and we use the security-assured network as the typical scenario. In particular, we consider a dual-hop relay network including a transmitter, a receiver, an amplify-and-forward (AF) untrusted relay, and a jamming node. The jamming node is treated as a helper. Specifically, the jammer broadcasts artificial noise (AN), which in fact pollutes both the untrusted relay and the destination node’s signals. However, we show that such AN can be effectively mitigated after the destination node obtains the forwarded signal from the relay, while the untrusted relay node cannot do so. The core idea for robustness assurance is to exploit higher signal dimensions at the receiver over the untrusted relay node. Simulations and analyses are also conducted to demonstrate that our proposed scheme can make the performance at the untrusted relay an interference-limited manner while completely removing the interferences at the receiver, therefore corroborating our claim in robustness in terms of security and reliability.

APA, Harvard, Vancouver, ISO, and other styles

13

Mustaghfirin, Muhamad, Keshav Singh, Sudip Biswas, and Wan-Jen Huang. "Performance Analysis of Intelligent Reflecting Surface-Assisted Multi-Users Communication Networks." Electronics 10, no. 17 (August 27, 2021): 2084. http://dx.doi.org/10.3390/electronics10172084.

Full text

Abstract:

An intelligent reflecting surface (IRS) is an array that consists of a large number of passive reflecting elements. Such a device possesses the potential to extend the coverage of transmission in future communication networks by overcoming the effects of non line-of-sight propagation. Accordingly, to present the case for utilizing IRS panels in future wireless networks, in this paper, we analyze a multi-user downlink network aided by IRS. In particular, by using a realistic 5G channel model, we compare the performance of the IRS-aided network with a decode and forward (DF) relay-aided scenario and a network without IRS or relay. Our analysis revealed the following: (i) At best, communication aided by a DF relay with perfect channel state information (CSI) could match the performance of the IRS-aided network with imperfect CSI when the channel estimation error was high and the number of users was large. (ii) IRS-aided communication outright outperformed the DF relay case when the transmit power was high or the number of users in the network was low. (iii) Increasing the number of elements in an IRS translated to greater quality of service for the users. (iv) IRS-aided communication showed better energy efficiency compared with the other two scenarios for higher quality of service requirements.

APA, Harvard, Vancouver, ISO, and other styles

14

Sani, Dian Ahkam, and Immilda Lailatul Fijriyah. "Switching Systems Designing Based on IoT." International Journal of Artificial Intelligence & Robotics (IJAIR) 2, no. 2 (December 1, 2020): 62. http://dx.doi.org/10.25139/ijair.v2i2.3138.

Full text

Abstract:

The development of technology has progressed very rapidly in a short period, as has technology that has recently been developed in various aspects of life, namely the Internet of Things. In the past, controlling household electrical appliances was usually done directly by pressing a button on the house's wall and was very ineffective when the house owner was out of town while the house was empty. With the Internet of Things technology, a system can be applied in everyday life, namely controlling household electrical appliances to turn off and remotely using internet communication via an android smartphone. In this system design, a control design using a series of microcontrollers and relays connected to a smartphone via the internet is used because the microcontroller already has a Wireless Fidelity (WIFI) module. The results of controlled tests on household electrical appliances can run well. All components of the design of the device are well integrated with smartphones and the internet. Control can be done anywhere and anytime. System response during the day between 1-4 seconds and at night between 1-2 seconds.

APA, Harvard, Vancouver, ISO, and other styles

15

Lee, Sangku, Janghyuk Youn, and Bang Chul Jung. "Hybrid AF/DF Cooperative Relaying Technique with Phase Steering for Industrial IoT Networks." Energies 14, no. 4 (February 10, 2021): 937. http://dx.doi.org/10.3390/en14040937.

Full text

Abstract:

For the next generation of manufacturing, the industrial internet of things (IoT) has been considered as a key technology that enables smart factories, in which sensors transfer measured data, actuators are controlled, and systems are connected wirelessly. In particular, the wireless sensor network (WSN) needs to operate with low cost, low power (energy), and narrow spectrum, which are the most technical challenges for industrial IoT networks. In general, a relay-assisted communication network has been known to overcome scarce energy problems, and a spectrum-sharing technique has been considered as a promising technique for the radio spectrum shortage problem. In this paper, we propose a phase steering based hybrid cooperative relaying (PSHCR) technique for the generic relay-assisted spectrum-shared WSN, which consists of a secondary transmitter, multiple secondary relays (SRs), a secondary access point, and multiple primary access points. Basically, SRs in the proposed PSHCR technique operate with decode-and-forward (DF) relaying protocol, but it does not abandon the SRs that failed in decoding at the first hop. Instead, the SRs operate with amplify-and-forward (AF) protocol when they failed in decoding at the first hop. Furthermore, the SRs (regardless of operating with AF or DF protocol) that satisfy interference constraints to the primary network are allowed to transmit a signal to the secondary access point at the second hop. Note that phase distortion is compensated through phase steering operation at each relay node before second-hop transmission, and thus all relay nodes can operate in a fully distributed manner. Finally, we validate that the proposed PSHCR technique significantly outperforms the existing best single relay selection (BSR) technique and cooperative phase steering (CPS) technique in terms of outage performance via extensive computer simulations.

APA, Harvard, Vancouver, ISO, and other styles

16

Zhao, Kamezaki, Yamaguchi, Konno, Onuki, and Sugano. "A Preliminary Experimental Analysis of In-Pipe Image Transmission Based on Visible Light Relay Communication." Sensors 19, no. 21 (November 1, 2019): 4760. http://dx.doi.org/10.3390/s19214760.

Full text

Abstract:

The regular inspection of underground facilities such as pipelines is absolutely essential. Pipeline leakage caused by corrosion and deformation must be detected in time, otherwise, it may cause fatal disasters for human beings. In our previous research, a robot chain system (RCS) based on visible light relay communication (VLRC) for pipe inspection has been developed. This system can basically realize the light-based transmission of control command signals and illuminance-based coordinated movement, whereas the collection and transmission approach of the pipe leakage image have not been studied. Compared with former in-pipe wireless communication techniques, VLRC can not only overcome the instability and inefficiency of in-pipe data transmission but also extend the communication range with high transmission rates. The most important feature is that it can provide a stable illumination and high-quality communication for pipe inspection robot and finally improve the energy efficiency. Hence, the aim of this article is to analyze the performance of VLRC-based image transmission in the pipe and in the future provide a high-quality, long-range, and high-efficiency image transmission for complex infrastructure inspection with RCS. The transmission systems based on two signal transmission modes analog image signal relay transmission (AISRT) and digital image frame relay transmission (DIFRT) have been proposed. Multiple experiments including the waveform test, the test of transmission features with different bit error rate (BER), and in the different mediums were conducted between these two systems. The experiment revealed that DIFRT was superior to the AISRT in terms of the relatively high-quality image transmission and reconstruction quality. It could better overcome the attenuation brought by the absorption and scattering effects and finally increased the transmission range than former communication methods. The DIFRT system could also operate at 50 kbps with relatively low BER whether in the air or water. The technique in this research could potentially provide a new strategy for implementations in the stable, effective, high-speed, and long-range image transmission of the robots in some other special environments such as tunnel, mine, and underwater, etc.

APA, Harvard, Vancouver, ISO, and other styles

17

Zhang, J., and T. M. Lok. "Cooperative protocols for multiple-source multiple-relay wireless networks." International Journal of Sensor Networks 4, no. 4 (2008): 209. http://dx.doi.org/10.1504/ijsnet.2008.022705.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Le, Anh-Tu, and Dinh-Thuan Do. "Implement of multiple access technique by wireless power transfer and relaying network." Bulletin of Electrical Engineering and Informatics 10, no. 2 (April 1, 2021): 793–800. http://dx.doi.org/10.11591/eei.v10i2.1903.

Full text

Abstract:

In this paper, we investigate non-orthogonal multiple access (NOMA) network relying on wireless power transfer to prolong lifetime. The base station (BS) sends common signals to the relay with two functions (energy harvesting (EH) and signal processing) to further serve two NOMA users in downlink. Performance gap exists since different power allocation factor assigned from power splitting protocol adopted at the relay and such relay employs both amplify-and-forward (AF) and decode-and-forward schemes. To provide performance metrics, we prove formulas of the outage probability which is a function of transmit signal to noise ratio. Simulation results indicate specific parameters to adjust system performance of two user in the considered EH-NOMA system. This finding is important recommendation to design EH-NOMA which shows particular outage performance at required target rates.

APA, Harvard, Vancouver, ISO, and other styles

19

Zhang, Yindong, Liusheng Huang, Henan Zhao, and Hongli Xu. "An energy-efficient opportunistic relay assignment in wireless cooperative networks." International Journal of Sensor Networks 13, no. 3 (2013): 135. http://dx.doi.org/10.1504/ijsnet.2013.055004.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Shim, Kyuwook, and Hyung-Kun Park. "Priority-Based Pipelined-Forwarding MAC Protocol for EH-WSNs." Wireless Communications and Mobile Computing 2019 (May 14, 2019): 1–7. http://dx.doi.org/10.1155/2019/5418516.

Full text

Abstract:

To reduce the end-to-end delay in EH-WSNs (energy-harvesting wireless sensor networks), medium access control protocols using pipelined-forwarding have been introduced and studied. In real-life applications, there are several situations where it is difficult to harvest more energy than the energy consumed. Therefore, it is crucial to design a MAC protocol that allows nodes to efficiently relay data without exhausting the power in pipelined-forwarding multihop transmission. In this paper, we propose a PP-MAC (priority-based pipelined-forwarding MAC) protocol that determines the priority of relay nodes based on the residual power and energy-harvesting rate. The proposed protocol determines the probability of a node becoming a relay node based on the priority of the node and attempts to access the channel in a distributed manner. Furthermore, the PP-MAC protocol controls the sleep interval based on the power conditions of the nodes. It also minimizes the power exhaustion problem by controlling the sleep interval based on the priority of the nodes. The performance of the proposed PP-MAC was evaluated via computer simulation, and the results indicated that PP-MAC could improve the network lifetime by mitigating the power imbalance of nodes.

APA, Harvard, Vancouver, ISO, and other styles

21

Radha, S., G. Josemin Bala, E. Grace Mary Kanaga, and P. Nagabushanam. "Scheduling and adaptive listening approaches in MAC for WSN applications: A survey." Journal of High Speed Networks 26, no. 4 (December 23, 2020): 325–38. http://dx.doi.org/10.3233/jhs-200647.

Full text

Abstract:

False data detection, intrusion detection and coverage rate are major challenges in wireless sensor networks (WSN). Scheduling in media access control (MAC) using gateway and relay nodes solve some of the problems. In this paper, we carried out a brief survey on scheduling, delay aware MAC, cooperative communications in MAC, and adaptive listening to keep controlling the energy in sensors. In addition, multichannel MAC and various routing strategy techniques for WSN are discussed. Firefly algorithm for dynamic scheduling pipelined scheduling for linear sensor networks gives better throughput and latency. Heuristic configuration solves the overhearing problem, as node power-based MAC controls power of each node. Based on WSN applications and the performance metrics concentrated, various techniques for MAC are discussed throughout in this paper.

APA, Harvard, Vancouver, ISO, and other styles

22

Yu, Qiaolin, Xiaofei Liu, Sihui Li, Lei Hou, Chengdong Zhu, and Ying Lin. "Semantic-Based Sports Music Information Fusion and Retrieval in Wireless Sensor Networks." Journal of Sensors 2021 (September 17, 2021): 1–10. http://dx.doi.org/10.1155/2021/4853183.

Full text

Abstract:

The wireless sensor network has developed rapidly in recent years. It is formed by the intersection of multiple disciplines. It integrates embedded technology, sensor technology, distributed technology, wireless communication technology, and modern networks. It is a brand new information acquisition platform. The characteristics of sensor networks determine that information fusion technology is a hot spot in the research of wireless sensor networks. Information fusion can achieve high performance and low cost in terms of energy and communication, which is of great significance to the research of sensor networks. This paper is aimed at studying the semantic-based sports music information fusion and retrieval research in wireless sensor networks. WSNs may face various attacks including eavesdropping attacks, replay attacks, Sybil attacks, and DOS attacks. Therefore, they are designing sensor network solutions. It is necessary to consider the network security issues. This article summarizes and analyzes the existing WSN security data fusion solutions for this issue and compares them by classification. This paper proposes methods and theories such as the spatial correlation detection algorithm, CBA algorithm, FTD algorithm, and DFWD algorithm, which enriches the research of information fusion and retrieval in wireless sensor networks, which is of exploratory significance, and it also establishes this problem. The model was studied, and reliable data was obtained. The experimental results of this paper show that when using these methods to diagnose faults in WSN, the correct rate of model diagnosis is higher than 77%.

APA, Harvard, Vancouver, ISO, and other styles

23

Mansor, Hasmah, Ammar Nor Azlin, Teddy Surya Gunawan, Mahanijah Md Kamal, and Ahmad Zawawi Hashim. "Development of Smart Chicken Poultry Farm." Indonesian Journal of Electrical Engineering and Computer Science 10, no. 2 (May 1, 2018): 498. http://dx.doi.org/10.11591/ijeecs.v10.i2.pp498-505.

Full text

Abstract:

In Malaysia, most agriculture industries are still using conventional method to operate. All routines in monitoring and control of chicken poultry farm, for example, utilise man power where the source and energy are very limited. However, the demand from consumers towards the agricultural output is increasing day by day and requires more advanced farming technology in order to obtain maximum efficiency. This paper is focused on the development of smart chicken poultry farm to provide monitoring and control of the farm condition. The electronics, embedded systems and wireless technology are integrated with farm monitoring. Using Master-Slave concept, sensors are used to measure the ambient temperature, ammonia and humidity of the hall of chicken poultry for each slave. The sensors’ readings are then transmitted wirelessly over radio frequency by serial communication using HC-12 RF module to master for further data processing. The design process of both master and slave involved the interfacing of microprocessor, ATMEL ATMega328 with several analogue sensors, LCD, buzzer, relay output, monetary push button and light indicator. Based on the readings from the sensors, the microcontroller produced the output which is connected to the fan for better air ventilation in the chicken poultry farm. Furthermore, PID controller has been integrated to optimize the output control method, hence optimizing hall condition which results to better output for the farm. The system has been successfully implemented and tested at Myra Farm & Services, located at Kalumpang, Tanjung Malim, Perak, Malaysia.In Malaysia, most agriculture industries are still using conventional method to operate. All routines in monitoring and control of chicken poultry farm, for example, utilise man power where the source and energy are very limited. However, the demand from consumers towards the agricultural output is increasing day by day and requires more advanced farming technology in order to obtain maximum efficiency. This paper is focused on the development of smart chicken poultry farm to provide monitoring and control of the farm condition. The electronics, embedded systems and wireless technology are integrated with farm monitoring. Using Master-Slave concept, sensors are used to measure the ambient temperature, ammonia and humidity of the hall of chicken poultry for each slave. The sensors’ readings are then transmitted wirelessly over radio frequency by serial communication using HC-12 RF module to master for further data processing. The design process of both master and slave involved the interfacing of microprocessor, ATMEL ATMega328 with several analogue sensors, LCD, buzzer, relay output, monetary push button and light indicator. Based on the readings from the sensors, the microcontroller produced the output which is connected to the fan for better air ventilation in the chicken poultry farm. Furthermore, PID controller has been integrated to optimize the output control method, hence optimizing hall condition which results to better output for the farm. The system has been successfully implemented and tested at Myra Farm & Services, located at Kalumpang, Tanjung Malim, Perak, Malaysia.

APA, Harvard, Vancouver, ISO, and other styles

24

Gu, Fangqing, Hai Lin Liu, and Qiang Wang. "Relay node deployment for wireless sensor networks using evolutionary multi-objective algorithm." International Journal of Sensor Networks 31, no. 3 (2019): 189. http://dx.doi.org/10.1504/ijsnet.2019.10024386.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Wang, Qiang, Hai Lin Liu, and Fangqing Gu. "Relay node deployment for wireless sensor networks using evolutionary multi-objective algorithm." International Journal of Sensor Networks 31, no. 3 (2019): 189. http://dx.doi.org/10.1504/ijsnet.2019.103046.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Khalid, Haqi, Shaiful Jahari Hashim, Sharifah Mumtazah Syed Ahmad, Fazirulhisyam Hashim, and Muhammad Akmal Chaudhary. "Cross-SN: A Lightweight Authentication Scheme for a Multi-Server Platform Using IoT-Based Wireless Medical Sensor Network." Electronics 10, no. 7 (March 26, 2021): 790. http://dx.doi.org/10.3390/electronics10070790.

Full text

Abstract:

Several wireless devices and applications can be connected through wireless communication technologies to exchange data in future intelligent health systems (e.g., the Internet of Medical Things (IoMT)). Smart healthcare requires ample bandwidth, reliable and effective communications networks, energy-efficient operations, and quality of service support (QoS). Healthcare service providers host multi-servers to ensure seamless services are provided to the end-users. By supporting a multi-server environment, healthcare medical sensors produce many data transmitted via servers, which is impossible in a single-server architecture. To ensure data security, secure online communication must be considered since the transmitted data are sensitive. Hence, the adversary may try to interrupt the transmission and drop or modify the message. Many researchers have proposed an authentication scheme to secure the data, but the schemes are vulnerable to specific attacks (modification attacks, replay attacks, server spoofing attacks, Man-in-the middle (MiTM) attacks, etc.). However, the absence of an authentication scheme that supports a multi-server security in such a comprehensive development in a distributed server is still an issue. In this paper, a secure authentication scheme using wireless medical sensor networks for a multi-server environment is proposed (Cross-SN). The scheme is implemented with a smart card, password, and user identity. Elliptic curve cryptography is utilized in the scheme, and Burrows–Abadi–Needham (BAN) logic is utilized to secure mutual authentication and to analyse the proposed scheme’s security. It offers adequate protection against replies, impersonation, and privileged insider attacks and secure communication in multi-server parties that communicate with each other.

APA, Harvard, Vancouver, ISO, and other styles

27

Khalid, Khuram, Isaac Woungang, Sanjay K. Dhurandher, Jagdeep Singh, and Leonard Barolli. "A fuzzy-based check-and-spray geocast routing protocol for opportunistic networks." Journal of High Speed Networks 27, no. 1 (March 29, 2021): 1–12. http://dx.doi.org/10.3233/jhs-210648.

Full text

Abstract:

Unlike communication networks which are traditionally assumed to be connected, Opportunistic networks (OppNets) are a type of wireless ad hoc networks with no guarantee of end-to-end path for data routing, which is due to node mobility, volatile links, and frequent disconnections. As such, data transmission among the nodes relies on their cooperation and this is realized in a store-and-carry fashion. To this end, several opportunistic routing techniques have been proposed in the literature, some of which using geocasting, a technique that consists of scheduling the message to a specific region toward its destination. This paper proposes a Fuzzy-based Check-and-Spray Geocast (FCSG) routing protocol for OppNets, in which a Check-and-Spray mechanism is used to control the message flooding within the destination cast and a fuzzy controller is used for selecting the suitable relay nodes to carry the message toward the destination, with the aim to improve the delivery ratio. Using simulations, the proposed FCSG protocol is shown to outperform the F-GSAF, GeoEpidemic and EECSG routing protocols in terms of overhead ratio, average latency, and delivery ratio, under varying number of nodes, buffer size, and Time-to-Live.

APA, Harvard, Vancouver, ISO, and other styles

28

Seong, Teh Boon, Vasaki Ponnusamy, Noor Zaman Jhanjhi, Robithoh Annur, and M. N. Talib. "A comparative analysis on traditional wired datasets and the need for wireless datasets for IoT wireless intrusion detection." Indonesian Journal of Electrical Engineering and Computer Science 22, no. 2 (May 1, 2021): 1165. http://dx.doi.org/10.11591/ijeecs.v22.i2.pp1165-1176.

Full text

Abstract:

IoT networks mostly rely on wireless mediums for communication, and due to that, they are very susceptible to intrusions. And due to the tiny nature, processing complexity, and limited storage capacities, IoT networks require very reliable intrusion detection systems (IDS). Although there are many IDS types of research available in the literature, most of these systems are suitable for wired network environments, and the benchmark datasets used for these research works are mostly relying on wired datasets such as KDD Cup’99 and NSL-KDD. IoT and wireless networks are distinct in nature as wireless networks give more emphasis on the data link layer and physical layer. These concerns are not given much attention in traditional wired datasets in the body of knowledge. Therefore, in this research, an IDS system is developed using a newly available IoT wireless dataset (NaBIoT) in the literature with the datasets focusing much on the common IoT related attacks, and related layers are taken into consideration. The IDS system developed is evaluated by comparing with various machine learning algorithms in terms of evaluation metrics such as accuracy, F1 score, false positive, and false negative. Moreover, the IoT wireless dataset is compared against the traditional NSL-KDD datasets to evaluate the need for IoT wireless datasets. The NaBIoT datasets show its effectiveness in detecting wireless intrusions. Besides that, the simulation is performed with different combinations of features to conclude that certain features are primary in detecting attacks, and IDS does not require all the features to perform detection. This can reduce the detection time mainly for machine learning and creating the models. This research results have proposed some of the critically important features to be used and eliminating not such important features.

APA, Harvard, Vancouver, ISO, and other styles

29

Le, Anh-Tu, and Dinh-Thuan Do. "Joint impacts of relaying scheme and wireless power transfer in multiple access of cellular networks." Bulletin of Electrical Engineering and Informatics 10, no. 2 (April 1, 2021): 811–19. http://dx.doi.org/10.11591/eei.v10i2.1936.

Full text

Abstract:

This paper considers ergodic capacity of energy harvesting (EH) based cellular networks. Such a network employs non-orthogonal multiple access (NOMA) together with relaying scheme to serve two far users. In this system model, relay is facilitated power splitting (PS) protocol to implement energy harvesting (EH). To examine capacity, expressions of signal to noise ratio (SNR) need be computed to achieve capacity. Power allocation factors are different for two users in such system and hence performance gap happens to distinguish requirements for separated users. It can be confirmed that the proposed paradigm exhibits maximal achievable capacity in some scenarios of setting parameters. To confirm exactness of the analytical expressions and show advantages of the proposed EH-NOMA, simulation results are performed in terms of ergodic capacity.

APA, Harvard, Vancouver, ISO, and other styles

30

Bari, Ataul, Da Teng, Rashid Ahmed, and Arunita Jaekel. "Relay node placement with energy and buffer constraints in wireless sensor networks using mobile data collector." International Journal of Sensor Networks 8, no. 3/4 (2010): 147. http://dx.doi.org/10.1504/ijsnet.2010.036190.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Verdecia-Peña, Randy, and José I. Alonso. "A Comparative Experimental Study of MIMO A&F and D&F Relay Nodes Using a Software-Defined Radio Platform." Electronics 10, no. 5 (February 28, 2021): 570. http://dx.doi.org/10.3390/electronics10050570.

Full text

Abstract:

The relaying technologies in co-operative systems are considered a core element in actual and future wireless communications, assisting the network by enhancing its reliability and improving its capability through exploiting co-operativity. In this paper, a co-operative system testbed based on Software Defined Radio (SDR) through Universal Software Radio Peripherals (USRPs) and the MatlabTM software is presented. The main novelty in this development of the platform is the implementation of 4G signal features, such as Physical Downlink Shared Channel (PDSCH) and Downlink Shared Channel (DL-SCH) for transport channel coding, which is one of the main contribution of the paper. The developed Multi-Input and Multi-Output (MIMO) SDR co-operative platform is capable of developing prototypes for the Relay Nodes. More specifically, the Amplify-&-Forward (A&F)—with or without Zero Forcing (ZF) and Minimum Mean Square Error (MMSE) Pre-Equalization—and Decode-&-Forward (D&F) protocols were implemented. Both Single-Input and Single-Output (SISO) and MIMO modes are supported by our testbed. The developed A&F and D&F MIMO co-operative systems in this paper utilize Orthogonal Space-Frequency Block Codes (OSFBCs) for the transmission of data symbols from the source to the destination. Our results show that relay nodes can substantially improve the Bit Error Rate (BER) and throughput in communications between the eNodeB (eNB) and User Equipment (UE). In particular, the maximum throughput achieved by conventional MIMO A&F is 9.3Mbps at SNR=16dB, which is 4Mbps higher than throughput of MIMO Non-Co-operative. It also shows the capacity improvement when considering the pre-equalization in the A&F schemes, compared to the conventional A&F Relay Node. For example, with MIMO A&F-MMSE pattern, a value of 11.8 Mbps is achieved for SNR=16dB, which is 84.8 % of the maximum system throughput (13.95 Mbps). On the other hand, the obtained results with D&F schemes far exceed those obtained with A&F strategies, achieving the maximum performance with the 2 × 2 MIMO D&F protocol from SNR=8dB. Furthermore, this work constitutes a first stage to the implementation of a 5G New-Radio Co-operative System platform.

APA, Harvard, Vancouver, ISO, and other styles

32

Ahmed, Sheeraz, Nadeem Javaid, Ashfaq Ahmad, Imran Ahmed, Mehr Yahya Durrani, Armughan Ali, Syed Bilal Haider, and Manzoor Ilahi. "SPARCO: Stochastic Performance Analysis with Reliability and Cooperation for Underwater Wireless Sensor Networks." Journal of Sensors 2016 (2016): 1–17. http://dx.doi.org/10.1155/2016/7604163.

Full text

Abstract:

Reliability is a key factor for application-oriented Underwater Sensor Networks (UWSNs) which are utilized for gaining certain objectives and a demand always exists for efficient data routing mechanisms. Cooperative routing is a promising technique which utilizes the broadcast feature of wireless medium and forwards data with cooperation using sensor nodes as relays. Here, we present a cooperation-based routing protocol for underwater networks to enhance their performance called Stochastic Performance Analysis with Reliability and Cooperation (SPARCO). Cooperative communication is explored in order to design an energy-efficient routing scheme for UWSNs. Each node of the network is assumed to be consisting of a single omnidirectional antenna and multiple nodes cooperatively forward their transmissions taking advantage of spatial diversity to reduce energy consumption. Both multihop and single-hop schemes are exploited which contribute to lowering of path-losses present in the channels connecting nodes and forwarding of data. Simulations demonstrate that SPARCO protocol functions better regarding end-to-end delay, network lifetime, and energy consumption comparative to noncooperative routing protocol—improved Adaptive Mobility of Courier nodes in Threshold-optimized Depth-based routing (iAMCTD). The performance is also compared with three cooperation-based routing protocols for UWSN: Cognitive Cooperation (Cog-Coop), Cooperative Depth-Based Routing (CoDBR), and Cooperative Partner Node Selection Criteria for Cooperative Routing (Coop Re and dth).

APA, Harvard, Vancouver, ISO, and other styles

33

Wydra, Michal, Pawel Kubaczynski, Katarzyna Mazur, and Bogdan Ksiezopolski. "Time-Aware Monitoring of Overhead Transmission Line Sag and Temperature with LoRa Communication." Energies 12, no. 3 (February 5, 2019): 505. http://dx.doi.org/10.3390/en12030505.

Full text

Abstract:

The techniques of Dynamic Line Rating (DLR) for Overhead Transmission Line (OTL)’s are currently dynamically developed. DLR systems typically rely on weather, temperature, inclination, and current measurements to calculate tension and sag, where sensors need to be installed directly on wires. Such systems are very reliable and ensure high accuracy in determining maximum allowable current. However, their installation may require switching off the transmission line from the operation. In order to receive precise values regarding the actual operating conditions of the whole transmission line, DLR sensors measuring wire temperature or tension should be installed at many points of OTL. The minimum number of installation points should cover at least each tension section and critical spans, thereby increasing installation costs. The alternative method that allows for the monitoring of OTL is the use of the vision system based on cameras. Installed on the OTLs’ poles, cameras can take photos which, appropriately processed, can provide data about the sag and temperature of wires, without the necessity of switching OTL from the operation for installation or further maintenance. Such a vision system facilitates also data transmission, because it does not require measurement data to be transmitted from the sensor station installed on the wire to the base station located on the pole (for instance, via radio). This article aims to present the concept of a vision system that monitors sag and temperature of Overhead Transmission Lines (OTLs)’ using Long Range (LoRa) wireless communication and data transmission. The developed system consists of a camera and a microcomputer equipped with LoRa communication module. The whole system monitors OTLs’ spans by taking photos, processing images for wire sag-temperature estimation, and sending results to the operator’s Supervisory Control And Data Acquisition (SCADA). The system communication architecture is also proposed and investigated for data transmission time when monitoring the whole OTL.

APA, Harvard, Vancouver, ISO, and other styles

34

Hoang, Tran Manh, Ba Cao Nguyen, Nguyen Nhu Thang, Minh Tran, and Phuong T. Tran. "Performance and optimal analysis of time-switching energy harvesting protocol for MIMO full-duplex decode-and-forward wireless relay networks with various transmitter and receiver diversity techniques." Journal of the Franklin Institute 357, no. 17 (November 2020): 13205–30. http://dx.doi.org/10.1016/j.jfranklin.2020.09.037.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Shaqfeh,, Mohammad Obaidah, and Hussein Alnuweiri. "Optimal resource allocation for relay-assisted wireless communication systems." Qatar Foundation Annual Research Forum Proceedings, no. 2010 (December 13, 2010): EEP12. http://dx.doi.org/10.5339/qfarf.2010.eep12.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Joo, Yang-Ick, Beom-Mu Kim, Min-A. Jeong, and Seong Ro Lee. "Performance Analysis of Relay-Based Shipboard Wireless Communication Systems." Journal of Korean Institute of Communications and Information Sciences 40, no. 1 (January 30, 2015): 202–8. http://dx.doi.org/10.7840/kics.2015.40.1.202.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Tabeshnezhad, Azadeh, and Mohammad Ali Pourmina. "Outage analysis of relay-assisted underwater wireless optical communication systems." Optics Communications 405 (December 2017): 297–305. http://dx.doi.org/10.1016/j.optcom.2017.08.051.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Ni, Wei, Iain B. Collings, Ren Ping Liu, and Zhuo Chen. "Relay-Assisted Wireless Communication Systems in Mining Vehicle Safety Applications." IEEE Transactions on Industrial Informatics 10, no. 1 (February 2014): 615–27. http://dx.doi.org/10.1109/tii.2013.2278617.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Maras, Ante, Josip Music, Stanko Kruzic, and Ivo Stancic. "Quadcopter Altitude Control Methods for Communication Relay Systems." Recent Advances in Communications and Networking Technology 6, no. 2 (August 6, 2018): 122–33. http://dx.doi.org/10.2174/2215081107666180216152118.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Alawady, Ahmed Allawy, Ahmed Alkhayyat, Mohammed Ahmed Jubair, Mustafa Hamid Hassan, and Salama A. Mostafa. "Analyzing bit error rate of relay sensors selection in wireless cooperative communication systems." Bulletin of Electrical Engineering and Informatics 10, no. 1 (February 1, 2021): 216–23. http://dx.doi.org/10.11591/eei.v10i1.2492.

Full text

Abstract:

Cooperative communication systems, which make use of the intermediate relays between the transmitter and the receiver, have been employed as an effective technique to combat the channel fading and to enhance system performance. Cooperative systems have some drawbacks such as high latency and may diversity order not guaranteed. To alleviate the negative effects of these factors, the relay selection protocol is employed in cooperative communication systems to increase overall cooperative system performance. Relay selection in the cooperative systems enables the source to cooperate with the single relay node rather than multiple relay nodes which guaranteed the diversity order.

APA, Harvard, Vancouver, ISO, and other styles

41

Belda, Květoslav, Václav Rychnovský, and Pavel Píša. "Wireless communication for control of manipulation systems." Archives of Control Sciences 22, no. 1 (January 1, 2012): 29–41. http://dx.doi.org/10.2478/v10170-011-0010-6.

Full text

Abstract:

Wireless communication for control of manipulation systemsThe paper deals with a novel application of the wireless data communication for a continual control of the distributed manipulation systems. The solution is intended for industrial robotic plants. A considered way of the wireless communication is based on ZigBee protocol. The protocol is tested for a real time bidirectional data communication within a manipulation system. The system consists of several moving manipulation units, several stationary auxiliary units and one control computer. The computer provides the cooperation of all units in the system in relation to the user requirements. The system is controlled by a simple feedback multi-level control realized in MATLAB - Simulink environment. The paper is focused on the realization of the boards of power electronics, transmitters, optical positional sensors, optical gates and their networking in accordance with ZigBee protocol definition. The behavior of the ZigBee is illustrated by several records from real experiments.

APA, Harvard, Vancouver, ISO, and other styles

42

Xiao, Junhao, Pan Wang, Huimin Lu, and Hui Zhang. "A three-dimensional mapping and virtual reality-based human–robot interaction for collaborative space exploration." International Journal of Advanced Robotic Systems 17, no. 3 (May 1, 2020): 172988142092529. http://dx.doi.org/10.1177/1729881420925293.

Full text

Abstract:

Human–robot interaction is a vital part of human–robot collaborative space exploration, which bridges the high-level decision and path planning intelligence of human and the accurate sensing and modelling ability of the robot. However, most conventional human–robot interaction approaches rely on video streams for the operator to understand the robot’s surrounding, which lacks situational awareness and force the operator to be stressed and fatigued. This research aims to improve efficiency and promote the natural level of interaction for human–robot collaboration. We present a human–robot interaction method based on real-time mapping and online virtual reality visualization, which is implemented and verified for rescue robotics. At the robot side, a dense point cloud map is built in real-time by LiDAR-IMU tightly fusion; the resulting map is further transformed into three-dimensional normal distributions transform representation. Wireless communication is employed to transmit the three-dimensional normal distributions transform map to the remote control station in an incremental manner. At the remote control station, the received map is rendered in virtual reality using parameterized ellipsoid cells. The operator controls the robot with three modes. In complex areas, the operator can use interactive devices to give low-level motion commands. In the less unstructured region, the operator can specify a path or even a target point. Afterwards, the robot follows the path or navigates to the target point autonomously. In other words, these two modes rely more on the robot’s autonomy. By virtue of virtual reality visualization, the operator can have a more comprehensive understanding of the space to be explored. In this case, the high-level decision and path planning intelligence of human and the accurate sensing and modelling ability of the robot can be well integrated as a whole. Although the method is proposed for rescue robots, it can also be used in other out-of-sight teleoperation-based human–robot collaboration systems, including but not limited to manufacturing, space, undersea, surgery, agriculture and military operations.

APA, Harvard, Vancouver, ISO, and other styles

43

Li, Yuhua, Lishuang Wan, and Haimin Zhang. "Communication Network for Sports Activity Monitoring Systems." Complexity 2021 (April 17, 2021): 1–10. http://dx.doi.org/10.1155/2021/9971605.

Full text

Abstract:

In this paper, through research and analysis of the communication network of the physical activity monitoring system, we combine wearable technology and identification technology and design a physical health monitoring bracelet that integrates multifaceted physical data collection and effective identity matching function. We match the identity through the chip and collect the physical fitness data generated in the process of exercise and centralized test by the sensor in real-time. Finally, the data transmission is realized through the WIFI communication function to achieve the purpose of monitoring physical exercise and improving physical quality. To ensure the continuity and stability of information transmission, the joint transmission method of direct transmission and indirect transmission is essential. Besides, considering the energy causality limitation of sensor nodes and relay nodes, a collaborative transmission model of wireless body area network based on wireless cognitive network is constructed. And, a power allocation algorithm based on maximum ratio merging and wireless cognitive network is proposed, which puts forward a new idea for the future research of wireless body area network resource allocation.

APA, Harvard, Vancouver, ISO, and other styles

44

Fu, You-hua, Rui Zhao, and Lu-xi Yang. "Performance Analysis of Optimal Beamforming in Relay-enhanced Wireless Communication Systems." Journal of Electronics & Information Technology 32, no. 8 (August 26, 2010): 1926–31. http://dx.doi.org/10.3724/sp.j.1146.2009.01089.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Campos-Delgado, Daniel U., Jose Martin Luna-Rivera, C. J. Martinez-Sánchez, Carlos A. Gutierrez, and J. L. Tecpanecatl-Xihuitl. "Network Efficient Power Control for Wireless Communication Systems." Scientific World Journal 2014 (2014): 1–14. http://dx.doi.org/10.1155/2014/650653.

Full text

Abstract:

We introduce a two-loop power control that allows an efficient use of the overall power resources for commercial wireless networks based on cross-layer optimization. This approach maximizes the network’s utility in the outer-loop as a function of the averaged signal to interference-plus-noise ratio (SINR) by considering adaptively the changes in the network characteristics. For this purpose, the concavity property of the utility function was verified with respect to the SINR, and an iterative search was proposed with guaranteed convergence. In addition, the outer-loop is in charge of selecting the detector that minimizes the overall power consumption (transmission and detection). Next the inner-loop implements a feedback power control in order to achieve the optimal SINR in the transmissions despite channel variations and roundtrip delays. In our proposal, the utility maximization process and detector selection and feedback power control are decoupled problems, and as a result, these strategies are implemented at two different time scales in the two-loop framework. Simulation results show that substantial utility gains may be achieved by improving the power management in the wireless network.

APA, Harvard, Vancouver, ISO, and other styles

46

Di, Xiaofei, and Yang Chen. "Joint Position and Time Allocation Optimization of UAV-Aided Wireless Powered Relay Communication Systems." Wireless Communications and Mobile Computing 2021 (April 17, 2021): 1–10. http://dx.doi.org/10.1155/2021/5537517.

Full text

Abstract:

The Internet of things (IoT) has emerged as a platform for connecting massive physical devices to collect and analyze data for decision-making. Wireless devices in IoT are usually energy-constrained and thus need to be powered by a stable and reliable energy source in order to maintain a long network lifetime. An unmanned aerial vehicle (UAV) as an energy source is a proper and applicable way to supply energy to wireless devices in IoT, due to its flexibility and potential of providing line-of-sight (LOS) links for wireless air-to-ground channels. In this paper, a UAV-aided wireless powered relay communication system is presented, where a UAV firstly emits energy to a source and a relay, and then, the source and relay cooperatively transmit information to their destination. To explore the performance limit of the system, a problem is formulated by jointly optimizing the position of the UAV and time allocation to maximize the achievable information rate of the system. By deriving the explicit expressions of the optimal position of UAV and optimal time fraction, the nonconvex optimization problem is efficiently solved. Simulation results show that our proposed method significantly outperforms the benchmark methods.

APA, Harvard, Vancouver, ISO, and other styles

47

Ejaz, Saqib, Feng-Fan Yang, and Hongjun Xu. "Split labeling diversity for wireless half-duplex relay assisted cooperative communication systems." Telecommunication Systems 75, no. 4 (July 13, 2020): 437–46. http://dx.doi.org/10.1007/s11235-020-00694-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Derek Kwaku, Pobi Asiedu, Roger Kwao Ahiadormey, Suho Shin, and Kyoung-Jae Lee. "Two-Way Hybrid Power-Line and Wireless Amplify-and-Forward Relay Communication Systems." JOURNAL OF ADVANCED INFORMATION TECHNOLOGY AND CONVERGENCE 9, no. 1 (July 31, 2019): 25–37. http://dx.doi.org/10.14801/jaitc.2019.9.1.25.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Li, Yao, Cailian Chen, Shanying Zhu, and Xinping Guan. "Sensor scheduling for relay-assisted wireless control systems with limited power resources." ISA Transactions 88 (May 2019): 246–57. http://dx.doi.org/10.1016/j.isatra.2018.11.043.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Liu, Dongning, Qian Jiang, Haibin Zhu, and Baoying Huang. "Distributing UAVs as Wireless Repeaters in Disaster Relief via Group Role Assignment." International Journal of Cooperative Information Systems 29, no. 01n02 (February 25, 2020): 2040002. http://dx.doi.org/10.1142/s021884302040002x.

Full text

Abstract:

When an earthquake occurs, disaster relief is an urgent, complex and critical mission. High on the list is communication network recovery within the disaster area. Unmanned aerial vehicles (UAVs) are often used in this regard. Some of them are used as collective repeaters to provide the required network coverage. Their timely, efficient, and collaborative deployment to specific locations is a big challenge. To meet this challenge, this paper formalizes and solves the problem of UAV deployment for signal relays via group role assignment (GRA). The minimum spanning tree algorithm is used to model a rapidly deployed optimal relay network. It can help establish the minimum number of relay points necessary to ensure communication stability. In this scenario, UAVs (agents) adopt roles as communication relays. The task of distributing UAVs to relay points can be solved quickly via the assignment process of GRA, which can solve the x-ILP problem with the help of the PuLP package of Python. Results from thousands of experimental simulations indicate that our solutions are effective, robust and practical. The process can be used to establish an optimal, efficient, and collaborative relay network using UAVs. Their rapid deployment can be a significant contribution to earthquake disaster relief.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Wireless communication systems Relay control systems'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles