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Journal articles on the topic 'RF communication systems'

Author: Grafiati

Published: 6 September 2023

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1

HALUŠKA, Renát, and Ľuboš OVSENÍK. "EXAMPLE OF SWITCHING HYBRID FSO/RF SYSTEMS." Acta Electrotechnica et Informatica 20, no. 4 (2021): 27–31. http://dx.doi.org/10.15546/aeei-2020-0022.

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This article addresses the issue of optical communication with Free Space Optics (FSO) and its use. The article deals with the design and construction of a monitoring system designed for the collection and processing of data characterizing the nature of conditions along the transmission path of a hybrid FSO system with a radio communication link. Due to the vulnerability of the FSO transmission channel to weather conditions, it is necessary to predict the strength of the received signal and switch to a backup line based on machine learning using decision trees.

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Sorrentino, Roberto, Paola Farinelli, Alessandro Cazzorla, and Luca Pelliccia. "RF-MEMS Application to RF Tuneable Circuits." Advances in Science and Technology 100 (October 2016): 100–108. http://dx.doi.org/10.4028/www.scientific.net/ast.100.100.

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The bursting wireless communication market, including 5G, advanced satellite communication systems and COTM (Communication On The Move) terminals, require ever more sophisticated functions, from multi-band and multi-function operations to electronically steerable and reconfigurable antennas, pushing technological developments towards the use of tunable microwave components and circuits. Reconfigurability allows indeed for reduced complexity and cost of the apparatuses. In this context, RF MEMS (Micro-Electro-Mechanical-Systems) technology has emerged as a very attractive solution to realize bo

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Singhal, Ankita, Nishu Rani, Kritika Sengar, Dolly Sharma, Seema Verma, and Tanya Singh. "RF Communication from SISO Systems to MIMO Systems: An Overview." International Journal of Engineering Trends and Technology 8, no. 5 (2014): 235–39. http://dx.doi.org/10.14445/22315381/ijett-v8p244.

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4

Raskin, Jean-Pierre. "FinFET and UTBB for RF SOI communication systems." Solid-State Electronics 125 (November 2016): 73–81. http://dx.doi.org/10.1016/j.sse.2016.07.004.

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5

Springer, A., and R. Weigel. "RF microelectronics for W-CDMA mobile communication systems." Electronics & Communication Engineering Journal 14, no. 3 (2002): 92–100. http://dx.doi.org/10.1049/ecej:20020301.

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6

Young, Darrin J. "Micromachining for rf Communications." MRS Bulletin 26, no. 4 (2001): 331–32. http://dx.doi.org/10.1557/mrs2001.74.

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The increasing demand for wireless communication applications, such as cellular and cordless telephones, wireless data networks, and global positioning systems, motivates a growing interest in building miniature radio transceivers that can support multistandard capabilities. Such transceivers will greatly enhance the convenience and accessibility of various wireless services.

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Zhang, Zhenyu, Anas Chaaban, and Lutz Lampe. "Physical layer security in light-fidelity systems." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 378, no. 2169 (2020): 20190193. http://dx.doi.org/10.1098/rsta.2019.0193.

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Light-fidelity (LiFi) is a light-based wireless communication technology which can complement radio-frequency (RF) communication technologies for indoor applications. Although LiFi signals are spatially more contained than RF signals, the broadcasting nature of LiFi also makes it susceptible to eavesdropping. Therefore, it is important to secure the transmitted data against potential eavesdroppers. In this paper, an overview of the recent developments pertaining to LiFi physical layer security (PLS) is provided, and the main differences between LiFi PLS and RF PLS are explained. LiFi achievabl

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Yang, H. Y. D. "Analysis of RF radiation interference on wireless communication systems." IEEE Antennas and Wireless Propagation Letters 2 (2003): 126–29. http://dx.doi.org/10.1109/lawp.2003.816634.

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Sreenivasa Reddy, Yeduri, Meenakshi Panda, Ankit Dubey, Abhinav Kumar, Trilochan Panigrahi, and Khaled M. Rabie. "Optimisation of indoor hybrid PLC/VLC/RF communication systems." IET Communications 14, no. 1 (2020): 117–26. http://dx.doi.org/10.1049/iet-com.2019.0665.

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Eslami, Ali, Sarma Vangala, and Hossein Pishro-Nik. "Hybrid Channel Codes for Efficient FSO/RF Communication Systems." IEEE Transactions on Communications 58, no. 10 (2010): 2926–38. http://dx.doi.org/10.1109/tcomm.2010.082710.090195.

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11

Daldal, Nihat, Majid Nour, and Kemal Polat. "The Methods toward Improving Communication Performance in Transparent Radio Frequency Signals." Mathematical Problems in Engineering 2020 (April 24, 2020): 1–8. http://dx.doi.org/10.1155/2020/7175864.

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In wireless digital communications, amplitude-shift keying (ASK) and frequency-shift keying (FSK) modules are often used and radio frequency (RF), communication synchronization, and noise problems affect the performance very much. In particular, the sending of byte-type data called synchronous and preamble before sending data in intermodule communication increases the sent data and decreases the speed. Also, the microcontroller at the output of the RF receiver module continuously listens to the RF noise and analyzes incoming data, but this increases the processing load of the microcontroller.

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12

Bravo Alvarez, Lisandra, Samuel Montejo-Sánchez, Lien Rodríguez-López, Cesar Azurdia-Meza, and Gabriel Saavedra. "A Review of Hybrid VLC/RF Networks: Features, Applications, and Future Directions." Sensors 23, no. 17 (2023): 7545. http://dx.doi.org/10.3390/s23177545.

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The expectation for communication systems beyond 5G/6G is to provide high reliability, high throughput, low latency, and high energy efficiency services. The integration between systems based on radio frequency (RF) and visible light communication (VLC) promises the design of hybrid systems capable of addressing and largely satisfying these requirements. Hybrid network design enables complementary cooperation without interference between the two technologies, thereby increasing the overall system data rate, improving load balancing, and reducing non-coverage areas. VLC/RF hybrid networks can o

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13

Cho, Sunghwan, Gaojie Chen, Justin P. Coon, and Pei Xiao. "Challenges in Physical Layer Security for Visible Light Communication Systems." Network 2, no. 1 (2022): 53–65. http://dx.doi.org/10.3390/network2010004.

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This article highlights challenges associated with securing visible light communication (VLC) systems by using physical layer security (PLS) techniques. Motivated by the achievements in PLS studies for radio frequency (RF) communication, many PLS techniques for VLC systems were also rigorously investigated by tailoring the RF techniques to the VLC environment. However, careful consideration of the inherent differences between RF and VLC systems is still needed. By disregarding these differences, an eavesdropper could be given an opportunity to wiretap the VLC systems, even when PLS techniques

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14

Sinha, Himanshu Kumar, Anand Kumar, and Abhishek Saurabh. "Role of RF Propagation in 5g Network." East African Scholars Journal of Engineering and Computer Sciences 6, no. 02 (2023): 20–25. http://dx.doi.org/10.36349/easjecs.2023.v06i02.001.

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The performance analysis of various empirical radio propagation models or harvesters used in wireless cellular networks is presented in this paper. In particular, second generation (2G) through fifth generation (5G) cellular networks route loss and cell coverage areas is researched. Planning any wireless communication system requires precise path loss and coverage area forecasting. The Hata model, the Stanford University Interim (SUI) model, and modified SUI models are contrasted in light of the urban terrain. The investigation is carried out at 28 GHz as inspiration for new wave (mm- wave) ce

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Bougas, Ioannis D., Maria S. Papadopoulou, Achilles D. Boursianis, Spyridon Nikolaidis, and Sotirios K. Goudos. "Dual-Band Rectifier Circuit Design for IoT Communication in 5G Systems." Technologies 11, no. 2 (2023): 34. http://dx.doi.org/10.3390/technologies11020034.

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Radio-frequency (RF) energy harvesting (EH) is emerging as a reliable and constantly available free energy source. The primary factor determining whether this energy can be utilized is how efficiently it can be collected. In this work, an RF EH system is presented. More particularly, we designed a dual-band RF to DC rectifier circuit at sub-6 GHz in the 5G bands, able to supply low-power sensors and microcontrollers used in agriculture, the military, or health services. The system operates at 3.5 GHz and 5 GHz in the 5G cellular network’s frequency band FR1. Numerical results reveal that the s

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16

Jokic, Ivana, Milos Frantlovic, Zoran Djuric, and Miroslav Dukic. "RF MEMS/NEMS resonators for wireless communication systems and adsorption-desorption phase noise." Facta universitatis - series: Electronics and Energetics 28, no. 3 (2015): 345–81. http://dx.doi.org/10.2298/fuee1503345j.

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During the past two decades a considerable effort has been made to develop radio-frequency (RF) resonators which are fabricated using the micro/nanoelectro-mechanical systems (MEMS/NEMS) technologies, in order to replace conventional large off-chip components in wireless transceivers and other high-speed electronic systems. The first part of the paper presents an overview of RF MEMS and NEMS resonators, including those based on two-dimensional crystals (e.g. graphene). The frequency tuning in MEMS/NEMS resonators is then analyzed. Improvements that would be necessary in order for MEMS/NEMS res

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17

Zhang, Caozheng, Libo Zheng, Jinghao Yu, Pengfei Ye, and Yi Liu. "A low insertion loss RF switch using a 130 nm SOI process." Journal of Physics: Conference Series 2384, no. 1 (2022): 012008. http://dx.doi.org/10.1088/1742-6596/2384/1/012008.

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Abstract To realize a better radio frequency (RF) communication system, the RF switch, as an important module, is used to cooperate with other devices to form an RF front end for optimizing communication performances. This paper designs a single-pole multi-throw (SPMT) RF switch, which exhibits a low insertion loss of 0.57 dB at 1.9 GHz under the voltage of 2.2 to 4.7 V. The RF switch is fabricated using a 130 nm silicon-on-insulator (SOI) complementary metal-oxide-semiconductor (CMOS) process. It can be used in multi-frequency and multi-mode applications such as 4G/5G. The proposed RF switch

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18

Singer, Andrew C., Gizem Tabak, and Michael L. Oelze. "High data rate ultrasonic communications." Journal of the Acoustical Society of America 151, no. 4 (2022): A244. http://dx.doi.org/10.1121/10.0011201.

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Ultrasonic signals have been used in biomedical applications since at least the 1940s. Underwater acoustic signals have been used in the subsea industry for ranging since the early 1900s and for SONAR imaging and communication in the decades that followed. Since the development of subsea communication systems in the 1940s, increasingly sophisticated means have be developed for transmitting information acoustically through the highly variable ocean environment. State-of-the-art acoustic communication systems leverage ultrasonic transducers to achieve data transmission rates that mirror radio-fr

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19

Gueye, Ibrahima, Ibra Dioum, Idy Diop, et al. "Performance of Hybrid RF/FSO Cooperative Systems Based on Quasicyclic LDPC Codes and Space-Coupled LDPC Codes." Wireless Communications and Mobile Computing 2020 (December 30, 2020): 1–15. http://dx.doi.org/10.1155/2020/8814588.

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Free space optical (FSO) communication systems provide wireless line of sight connectivity in the unlicensed spectrum, and wireless optical communication achieves higher data rates compared to their radio frequency (RF) counterparts. FSO systems are particularly attractive for last mile access problem by bridging fiber optic backbone connectivity to RF access networks. To cope with this practical deployment scenario, there has been increasing attention to the so-called dual-hop (RF/FSO) systems where RF transmission is used at a hop followed by FSO transmission to another. In this article, we

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20

Roy, Amlan Jyoti, Bhargavjyoti Sharma, Avinab Das, Sajid-ul Haque, and Dr Runumi Sarma. "Long Range RF- Text based Communication System." International Journal for Research in Applied Science and Engineering Technology 11, no. 8 (2023): 747–50. http://dx.doi.org/10.22214/ijraset.2023.55242.

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Abstract: With the growth of the Internet of Things (IoT) and other wireless applications in recent years the need for long-range and low-power communication systems has increased. This issue can be resolved by application of LoRa (Long Range) technology, which offers a long-range, low-power, and dependable communication system. LoRa is a wireless modulation technique derived from Chirp Spread Spectrum (CSS) technology. It encodes information on radio waves using chirp pulses in a way similar to the communication principles used naturally by dolphins and bats. LoRa modulated transmission is ro

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21

Liu, Jiahao, Jihong Yu, Xiaoming Chen, Rongrong Zhang, Shuai Wang, and Jianping An. "Covert Communication in Ambient Backscatter Systems With Uncontrollable RF Source." IEEE Transactions on Communications 70, no. 3 (2022): 1971–83. http://dx.doi.org/10.1109/tcomm.2022.3144447.

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22

Liao, Zhaohui, Liang Yang, Jianchao Chen, Hong-Chuan Yang, and Mohamed-Slim Alouini. "Physical Layer Security For Dual-Hop VLC/RF Communication Systems." IEEE Communications Letters 22, no. 12 (2018): 2603–6. http://dx.doi.org/10.1109/lcomm.2018.2873725.

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23

Letertre, Thierry, Vikass Monebhurrun, and Zeno Toffano. "Accurate measurement of RF exposure from emerging wireless communication systems." IOP Conference Series: Materials Science and Engineering 44 (April 23, 2013): 012015. http://dx.doi.org/10.1088/1757-899x/44/1/012015.

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24

Xie, Lianghui, Osama Elnahas, Qinglin Zhao, and Zhi Quan. "Data-Driven RF Transmit Power Calibration for Wireless Communication Systems." IEEE Wireless Communications Letters 9, no. 5 (2020): 721–25. http://dx.doi.org/10.1109/lwc.2020.2967213.

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25

Chunming Liu, Heng Xiao, Qiang Wu, and Fu Li. "Spectrum design of RF power amplifier for wireless communication systems." IEEE Transactions on Consumer Electronics 48, no. 1 (2002): 72–80. http://dx.doi.org/10.1109/tce.2002.1010094.

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26

Getu, Tilahun M., Wessam Ajib, and Rene Landry. "Power-Based Broadband RF Interference Detector for Wireless Communication Systems." IEEE Wireless Communications Letters 7, no. 6 (2018): 1002–5. http://dx.doi.org/10.1109/lwc.2018.2845373.

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27

Narayanan, Ram, Kyle Gallagher, Gregory Mazzaro, Anthony Martone, and Kelly Sherbondy. "Hardware Design of a High Dynamic Range Radio Frequency (RF) Harmonic Measurement System." Instruments 2, no. 3 (2018): 16. http://dx.doi.org/10.3390/instruments2030016.

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Radio frequency (RF) circuit elements that are traditionally considered to be linear frequently exhibit nonlinear properties that affect the intended operation of many other RF systems. Devices such as RF connectors, antennas, attenuators, resistors, and dissimilar metal junctions generate nonlinear distortion that degrades primary RF system performance. The communications industry is greatly affected by these unintended and unexpected nonlinear distortions. The high transmit power and tight channel spacing of the communication channel makes communications very susceptible to nonlinear distort

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28

Sarma, Ch Amarnatha, Syed Inthiyaz, and B. T. P. Madhav. "Design and Assessment of Bio-Inspired Antennas for Mobile Communication Systems." International Journal of Electrical and Electronics Research 11, no. 1 (2023): 176–84. http://dx.doi.org/10.37391/ijeer.110125.

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RF front-end system in the mobile communication system consists of an antenna, filter, and amplifier section. Now a day, there is a need to reduce the size of this RF front-end system. Here the challenge is the reduction in the size of the RF front end without degrading the performance. One way to reduce the size is by reducing the size or area of the antenna. This work proposes and simulates three Bio-inspired microstrip (BIMS) antenna designs. They are flower, Butterfly, and leaf shapes presented based on the perturbation method, Gielis super formula, and modified polar transformation models

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29

Allegro, Gabriele, Alessio Fascista, and Angelo Coluccia. "Acoustic Dual-Function Communication and Echo-Location in Inaudible Band." Sensors 22, no. 3 (2022): 1284. http://dx.doi.org/10.3390/s22031284.

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Acoustic communications are experiencing renewed interest as alternative solutions to traditional RF communications, not only in RF-denied environments (such as underwater) but also in areas where the electromagnetic (EM) spectrum is heavily shared among several wireless systems. By introducing additional dedicated channels, independent from the EM ones, acoustic systems can be used to ensure the continuity of some critical services such as communication, localization, detection, and sensing. In this paper, we design and implement a novel acoustic system that uses only low-cost off-the-shelf h

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30

Puntsri, Kidsanapong. "Improvement of RF-Pilot Based Phase Noise Compensation in CO-OFDM Communication Systems." ECTI Transactions on Electrical Engineering, Electronics, and Communications 13, no. 2 (2015): 58–64. http://dx.doi.org/10.37936/ecti-eec.2015132.171033.

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This paper presents an improvement of random phase noise (RPN) compensation under chromatic dispersion (CD) by a modified two stages RF-pilot-based. The first stage is similar to the conventional RF-pilot-based method and the second stage is called the fine RPN compensation. The second stage is used for minimizing the random rotation phasor by employing a RF-pilot window. The performance of RPN mitigation is evaluated by a numerical simulation method. At the forward error correction (FEC) limit, a sum laser linewidth tolerance of ~3.1 MHz can be achieved for the 256-quadrature amplitude modula

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31

Salvi, Sanket, and Geetha Vasantha. "An Optical Camera Communication Using Novel Hybrid Frequency Shift and Pulse Width Modulation Technique for Li-Fi." Computation 10, no. 7 (2022): 110. http://dx.doi.org/10.3390/computation10070110.

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With an increase in network-connected devices, the existing Radio Frequency (RF) spectrum is getting highly saturated. Non-RF-based communication systems have recently garnered attention as they can be considered an alternative to RF-based systems for some applications. The availability of efficient and low-cost electronic components like Light Emitting Diode (LED), photodiode, and cameras have been pivotal in building communications systems using visible light. High-speed communication using visible light can be achieved with customized hardware and software. Visible Light Communication (VLC)

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32

Márton, Michal, Ľuboš Ovseník, Ján Turán, Michal Špes, and Jakub Urbanský. "Design of Helix Antenna for 9.2GHz in FEKO for FSO/RF Hybrid System Focused on Height of Helix." Carpathian Journal of Electronic and Computer Engineering 11, no. 2 (2018): 3–7. http://dx.doi.org/10.2478/cjece-2018-0010.

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Abstract Nowadays we are living in the ages of expansion of communication. The young generation depends on the online communications with other. Each of the devices is purposed to communication. Cloud data storage systems are available only with stable connection. Requirements are growing up to date. The answer on these requirements: the high speed of transmission, high level of security and wide bandwidth are optical communication systems. This system offers comparable features as optical system with physical optical fibers. But it has one big drawback. It is sensitivity to weather changes. W

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33

Hu, Shengbo, Jinrong Mo, Tingting Yan, and Yanfeng Shi. "Power Control for Passive QAM Multisensor Backscatter Communication Systems." Journal of Sensors 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/4319709.

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To achieve good quality of service level such as throughput, power control is of great importance to passive quadrature amplitude modulation (QAM) multisensor backscatter communication systems. First, we established the RF energy harvesting model and gave the energy condition. In order to minimize the interference of subcarriers and increase the spectral efficiency, then, the colocated passive QAM backscatter communication signal model is presented and the nonlinear optimization problems of power control are solved for passive QAM backscatter communication systems. Solutions include maximum an

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34

Xu, Longteng, Kun Zhu, Ran Wang, and Shimin Gong. "Performance Analysis of RF-Powered Cognitive Radio Networks with Integrated Ambient Backscatter Communications." Wireless Communications and Mobile Computing 2018 (2018): 1–16. http://dx.doi.org/10.1155/2018/8509693.

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Integrating ambient backscatter communications into RF-powered cognitive radio networks has been shown to be a promising method for achieving energy and spectrum efficient communications, which is very attractive for low-power or no-power communications. In such scenarios, a secondary user (SU) can operate in either transmission mode or backscatter mode. Specifically, an SU can directly transmit data if sufficient energy has been harvested (i.e., transmission mode). Or an SU can backscatter ambient signals to transmit data (i.e., backscatter mode). In this paper, we investigate the performance

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35

Saber, Mohammad Javad, and Siavash Rajabi. "On Secrecy Performance of Millimeter-Wave RF-Assisted FSO Communication Systems." IEEE Systems Journal 15, no. 3 (2021): 3781–88. http://dx.doi.org/10.1109/jsyst.2021.3065885.

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36

Yang, Liang, Wang Guo, and Imran Shafique Ansari. "Mixed Dual-Hop FSO-RF Communication Systems Through Reconfigurable Intelligent Surface." IEEE Communications Letters 24, no. 7 (2020): 1558–62. http://dx.doi.org/10.1109/lcomm.2020.2986002.

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Abadi, Mojtaba Mansour, Zabih Ghassemlooy, Stanislav Zvanovec, David Smith, Manav R. Bhatnagar, and Yongle Wu. "Dual Purpose Antenna for Hybrid Free Space Optics/RF Communication Systems." Journal of Lightwave Technology 34, no. 14 (2016): 3432–39. http://dx.doi.org/10.1109/jlt.2016.2571846.

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Argudo, Allyffazzkkamn, and Ghislaine Nasibu. "Cyber-Physical Attack Using High Power RF in Havana, Cuba." International Conference on Cyber Warfare and Security 18, no. 1 (2023): 7–18. http://dx.doi.org/10.34190/iccws.18.1.961.

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Abstract: Global communications have relied heavily on fiber-optic cables. Satellite communications have become the norm for areas that are not highly populated or easily reached by conventional wires. The availability and use of satellite communications systems have had a limited market; with this limitation, the need for open development of each vendor's software never gained traction. This led to weaknesses not being discovered until a flaw was made public in a systems breach that affected the end users. Wireless communications that rely on microwaves lead to the use of malware to provide a

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Márton, Michal, Ľuboš Ovseník, Ján Turán, and Michal Špes. "Design of Pyramidal Horn Antenna for 2.45GHz in FEKO for Application in Experimental FSO/RF Hybrid System." Carpathian Journal of Electronic and Computer Engineering 11, no. 1 (2018): 7–10. http://dx.doi.org/10.2478/cjece-2018-0002.

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Abstract Communication technologies are growing for day to day because demand on data sharing is unstoppable. Users require availability of approach to network at all time. Implementation of smart technologies allows communication of all type of devices. Capacity of data flow have to grow. Video formats HD or 4K require transmit on high data speed. Based on the demands many types of different communication systems which are suitable for these speeds were designed. One of these systems is FSO (Free Space Optics). FSO system is based on transmission of optical beams which carry the information.

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40

Pokhodzey, Larisa V., and Yurij P. Paltsev. "Critical analysis of Russian and foreign hygienic regulations of electromagnetic fields (EMF) created by modern wireless communication and communication systems." Russian Journal of Occupational Health and Industrial Ecology 63, no. 6 (2023): 397–405. http://dx.doi.org/10.31089/1026-9428-2023-63-6-397-405.

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The authors present a critical analysis of domestic SanPiNs, international recommendations (ICNIRP 2020, EU Council Recommendation 1999/519/EC, EU Directive 2013/35/EC, IEEE Std C95.1-2019) and national standards of the USA, England, Germany, France, China, Italy and Switzerland establishing hygienic regulations for radio frequency band EMF RF created by modern wireless communication and communications systems. It is shown that the RF EMF remote controls in the workplace and for the population, installed in the Russian Federation, are generally the most stringent compared to foreign recommenda

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Hashimoto, Ken Ya, Hideki Hirano, Shuji Tanaka, and Masayoshi Esashi. "Functional RF Devices Powered by MEMS Technologies." Advances in Science and Technology 81 (September 2012): 75–83. http://dx.doi.org/10.4028/www.scientific.net/ast.81.75.

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This paper discusses use of MEMS technologies in radio frequency (RF) frontend. First, configuration of RF front-end in current wireless communication systems is surveyed, and research trends of the flexible RF front-end and software defined radio (SDR) are discussed. Second, various RF tunable filters are introduced, and we discuss how high performances are expected by the use of tunable RF surface and bulk acoustic wave (SAW/BAW) filters provided that above mentioned key technologies are developed. Finally, our attempts for realization of tunable RF SAW/BAW filters are introduced.

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Javed, Sana, Louey Issaoui, Seonghyeon Cho, and Hyunchae Chun. "Utilization of LED Grow Lights for Optical Wireless Communication-Based RF-Free Smart-Farming System." Sensors 21, no. 20 (2021): 6833. http://dx.doi.org/10.3390/s21206833.

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Indoor smart-farming based on artificial grow lights has gained attention in the past few years. In modern agricultural technology, the growth status is generally monitored and controlled by radio-frequency communication networks. However, it is reported that the radio frequency (RF) could negatively impact the growth rate and the health condition of the vegetables. This work proposes an energy-efficient solution replacing or augmenting the current RF system by utilizing light-emitting diodes (LEDs) as the grow lights and adopting visible light communications and optical camera communication f

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43

Muhammad, Surajo, Jun Jiat Tiang, Sew Kin Wong, et al. "Harvesting Systems for RF Energy: Trends, Challenges, Techniques, and Tradeoffs." Electronics 11, no. 6 (2022): 959. http://dx.doi.org/10.3390/electronics11060959.

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The RFEH design challenges can be broadly classified into overall radio frequency direct current (RF-to-DC) power conversion efficiency (PCE), form factor, operational bandwidth (BW), and compactness. A detailed overview of the essential components of an RFEH system is presented in this paper. Various design approaches have been proposed for the realization of compact RFEH circuits that contribute immensely to mm-wave rectenna design. Effective mechanisms for configuring the rectenna modules based on the recommended spectrums for the RFEH system were also outlined. This study featured a concep

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Samir, Ahmed, Mohamed Elsayed, Ahmad A. Aziz El-Banna, Imran Shafique Ansari, Khaled Rabie, and Basem M. ElHalawany. "Performance Analysis of Dual-Hop Hybrid RF-UOWC NOMA Systems." Sensors 22, no. 12 (2022): 4521. http://dx.doi.org/10.3390/s22124521.

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The hybrid combination between underwater optical wireless communication (UOWC) and radio frequency (RF) is a vital demand for enabling communication through the air–water boundary. On the other hand, non-orthogonal multiple access (NOMA) is a key technology for enhancing system performance in terms of spectral efficiency. In this paper, we propose a downlink NOMA-based dual-hop hybrid RF-UOWC with decode and forward (DF) relaying. The UOWC channels are characterized by exponential-generalized Gamma (EGG) fading, while the RF channel is characterized by Rayleigh fading. Exact closed-form expre

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Maity, Santigopal, Madutha Santosh Kumar, Chaitali Koley, Debashish Pal, and Ayan Kumar Bandyopadhyay. "Design of the Radio Frequency Section of a Ka-Band Multiple Beam Ladder-Type Extended Interaction Klystron." Electronics 11, no. 22 (2022): 3781. http://dx.doi.org/10.3390/electronics11223781.

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Ka-band frequencies are becoming increasingly popular due to their application potential in high-data-rate wireless communications relevant to 5G applications, satellite link establishment, etc. High-power amplifiers in this frequency band, offering several tens of watts of output RF power, are one of the main enabling components of these communication systems. This article reports the design studies and analysis of the radio frequency (RF) section of a multiple beam-extended interaction klystron (MB-EIK). The proposed multiple beam RF section with a ladder-type EIK structure offers several cr

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Majeed, Ammar A., and Ismail Hburi. "Energy-Efficient Optimization of mm-Wave Communication Using a Novel Approach of Beamspace MIMO-NOMA." Wasit Journal of Engineering Sciences 10, no. 2 (2022): 223–39. http://dx.doi.org/10.31185/ejuow.vol10.iss2.287.

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The new concept of Beamspace Multiple Input Multiple Output system (BS-MIMO) was developed to address the issue of reduced Energy Efficiency (EE) of the traditional MIMO in millimeter-Wave (mm-Wave) wireless communication systems by decreases the large number of radio frequency chains (RF-chains) while maintaining the same number of antennas in those systems. On the other hand, a fewer RF-Chains leads to a smaller number of users that the system can serve as a result of the number of users that can be served must be equal to/or less than the RF-chains’ number. To overcome the above issue, the

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Wu, Yan, Gang Li, and Dejin Kong. "Performance Analysis of Relay-Aided Hybrid FSO/RF Cooperation Communication System over the Generalized Turbulence Channels with Pointing Errors and Nakagami-m Fading Channels." Sensors 23, no. 13 (2023): 6191. http://dx.doi.org/10.3390/s23136191.

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To improve the performance of fee-space optical communication systems, this paper analyzes the performance of a relay-aided hybrid fee-space optical (FSO)/radio frequency (RF) cooperation system based on a selective combination and decoding forward transmission scheme. In this system, the FSO sub-link experienced Málaga turbulence with pointing errors and the RF sub-link suffered Nakagami-m fading. Firstly, the probability density function (PDF) and cumulative distribution function (CDF) of the end-to-end output signal-to-noise ratio (SNR) of the relay-aided hybrid FSO/RF system are derived. T

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Venkatalakshmi, B., and K. Radhika. "Design of Solid Mounted Components Using Bulk Acoustic Wave Technology for Communication." Advanced Materials Research 433-440 (January 2012): 7579–82. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.7579.

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Low power and portable systems working at high frequency are becoming a significant force in the communication industry. SAW filters have been used in wireless communication systems since the early days of mobile phones. But applications at the higher handset frequencies run up against the capability of conventional SAW structures. Bulk Acoustic Wave (BAW) Technology, a relatively recent addition to this portfolio follows MEMS principle to design high performance microwave components for RF communication. Simulation of the Bulk Acoustic Resonator using Butterworth Van Dyke Model (BVD) Model an

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HIKITA, MITSUTAKA. "SAW ANTENNA DUPLEXERS FOR MOBILE COMMUNICATION." International Journal of High Speed Electronics and Systems 10, no. 03 (2000): 793–824. http://dx.doi.org/10.1142/s0129156400000647.

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Mobile communications systems such as cellular radios have recently become very widespread and important to both business and personal users. A key component in the radio transceiver is an antenna duplexer, which makes it possible to use a single antenna to transmit and receive RF signals simultaneously. In this chapter, block diagrams of radio transceivers are shown and the frequency characteristics required for duplexers are discussed with regard to the system requirements. Procedures for designing duplexers using SAW-resonator-coupled filters and experimental results relevant to several sys

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Pedro, J. C., and N. B. Carvalho. "A novel nonlinear distortion characterisation standard for RF and microwave communication systems." Engineering Science & Education Journal 10, no. 3 (2001): 113–19. http://dx.doi.org/10.1049/esej:20010306.

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