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Journal articles on the topic 'Power radio signal attenuation'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Kolyadenko, Yu Yu, and N. A. Chursanov. "ANALYSIS OF INDICATORS OF ELECTROMAGNETIC COMPATIBILITY OF COMMUNICATION NETWORKS 5 G." Radio Electronics, Computer Science, Control, no. 3 (October 5, 2021): 7–16. http://dx.doi.org/10.15588/1607-3274-2021-3-1.

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Context. The next generation 5G / IMT-2020 technology, like any new technology, brings its own specific features to all aspects of the practice of its application. One of these particularly important aspects is electromagnetic compatibility. At the stage of preparation for the introduction of 5G radio networks, it is necessary to take early measures to effectively assess the EMC conditions for these networks based on a thorough analysis of the features of 5G technology, and by correctly and accurately assessing these conditions, successfully ensure the electromagnetic compatibility of radio eq

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Avva, Jessica, John M. Kovac, Christian Miki, David Saltzberg, and Abigail G. Vieregg. "An in situ measurement of the radio-frequency attenuation in ice at Summit Station, Greenland." Journal of Glaciology 61, no. 229 (2015): 1005–11. http://dx.doi.org/10.3189/2015jog15j057.

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AbstractWe report an in situ measurement of the electric field attenuation length Lα at radio frequencies for the bulk ice at Summit Station, Greenland, made by broadcasting radio-frequency signals vertically through the ice and measuring the relative power in the return ground bounce signal. We find the depth-averaged field attenuation length to be at 75 MHz. While this measurement has clear radioglaciological applications, the radio clarity of the ice also has implications for the detection of ultra-high energy (UHE) astrophysical particles via their radio emission in dielectric media such a

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Sakkas, Alexandros, Vasilis Christofilakis, Christos J. Lolis, Spyridon K. Chronopoulos, and Kostas P. Peppas. "Measuring Precipitation via Microwave Bands with a High-Accuracy Setup." Sensors 24, no. 24 (2024): 8056. https://doi.org/10.3390/s24248056.

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The urgent need for timely and accurate precipitation estimations in the face of ongoing climate change and the increasing frequency and/or intensity of extreme weather events underscores the necessity for innovative approaches. Recently, several studies have focused on estimating the precipitation rate through induced attenuation of radio frequency (RF) signals, which are abundant in modern communication systems. Most research has concentrated on frequencies exceeding 10 GHz, as attenuation at lower frequencies is minimal, posing measurement challenges. This study aims to confront this limita

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Movchan, A. K., E. V. Rogozhnikov, E. M. Dmitriev, S. A. Novichkov, and D. V. Lakontsev. "Calculation of signal attenuation of 5G cellular networks for frequencies of the FR1 band." Proceedings of Tomsk State University of Control Systems and Radioelectronics 25, no. 1 (2022): 17–23. http://dx.doi.org/10.21293/1818-0442-2021-25-1-17-23.

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The paper presents a model for the propagation of a radio signal of a fifth-generation cellular communication system, taking into account the unevenness of the terrain. The aim of the study is to assess the signal power level on the receiving side of the fourth and fifth generation cellular communication system when the signal propagates over uneven terrain in the frequency bands FR1 (2.6 GHz), FR1 (4.9 GHz). When estimating the power of the radio signal on the receiving side in the model, the values of the height map of the of Tomsk city, obtained in the course of the SRTM3 program, were used

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Muhammad, Tyabo A., Oyedum O. David, Ayantunji G. Benjamin, et al. "Study of Rain-Induced Signal Degradation of Terrestrial Radio Links within Minna and Lapai, North-Central, Nigeria." Physics Access 02, no. 01 (2022): 26–31. http://dx.doi.org/10.47514/phyaccess.2022.2.1.004.

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Rain attenuation is a major source of impairment to signal degradation at millimetre wave bands above 10 GHz. This research work determines the extent of signal degradation due to rainfall on terrestrial radio links within Minna and Lapai. The meteorological rainfall data collected from the Automatic Weather Stations installed at the Federal University of Technology, Minna, and at Ibrahim Badamasi Babangida University, Lapai, for a period of 3 years (2011-2013) were used to compute the rainfall attenuation on Microsoft Excel spreadsheets. The Lavergnat-Gole (LG) model was used for the conversi

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Carmen, Vázquez, D. López-Cardona Juan, C. Lallana Pedro, et al. "Multicore Fiber Scenarios Supporting Power Over Fiber in Radio Over Fiber Systems." IEEE Access 7, 2019 (November 30, 2019): 158409–18. https://doi.org/10.5281/zenodo.3530379.

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We propose the integration of power over ber in the next generation 5G radio access network front-haul solutions based on spatial division multiplexing with multicore bers. The different architectures in both shared- and dedicated- core scenarios for power over ber delivery and data signals are described. The maximum power to be delivered depending on the efciencies of the different components is addressed as well as the limits of the delivered energy to avoid ber fuse and non-linear effects. It is shown how those limits depend on high power laser linewidth, ber attenuation, link length and be

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Sakkas, Alexandros, Vasilis Christofilakis, Christos J. Lolis, Spyridon K. Chronopoulos, and Giorgos Tatsis. "Harnessing the Radio Frequency Power Level of Cellular Terminals for Weather Parameter Sensing." Electronics 13, no. 5 (2024): 840. http://dx.doi.org/10.3390/electronics13050840.

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In light of recent extreme weather events, it is imperative to explore innovative methodologies for promptly and accurately measuring various meteorological parameters. The high spatial and temporal variability in precipitation often surpasses the resolution capabilities of traditional rain gauge measurements and satellite estimation algorithms. Therefore, exploring alternative methods to capture this variability is crucial. Research on the correlation between signal attenuation and precipitation could offer valuable insights into these alternative approaches. This study investigates (a) the f

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Kriuchkova, Larysa, and Nikita Leontiuk. "SOFTWARE AND HARDWARE IMPLEMENTATION OF THE ALGORITHM FOR QUICK ASSESSMENT OF WI-FI SIGNAL POWER AT POINTS OF THE URBANIZED SPACE." Cybersecurity: Education, Science, Technique 4, no. 24 (2024): 241–56. http://dx.doi.org/10.28925/2663-4023.2024.24.241256.

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In connection with the widespread use of Wireless Fidelity wireless technologies; there is an urgent problem of ensuring the proper level of Wi-Fi signal in the space of urbanized premises. The presence of walls, partitions, furniture, radio-electronic equipment and other objects inside the building complicates the conditions for the propagation of radio waves. The main effects observed during the propagation of radio waves indoors are multipath due to multiple reflections of radio waves from walls and other objects, diffraction at numerous sharp edges of objects, and attenuation of radio wave

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9

Koliadenko, Yulia, Mykyta Chursanov, and Oleksii Koliadenko. "Methods of monitoring and control of parameters of signals and elements of the mobile communication network when solving the problem of electromagnetic compatibility." Problemi telekomunìkacìj, no. 2(27) (December 11, 2020): 3–15. http://dx.doi.org/10.30837/pt.2020.2.01.

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To ensure the electromagnetic compatibility of mobile networks, it is necessary to monitor and control: radio frequency resource, frequency and power of signals in the allocated frequency resource, group delay time, resistance parameters to linear attenuation and attenuation associated with multi-beam signal transmission, polarization signal parameters, location (coordinates) of moving sources. The evaluation of parameters based on the results of measurements is currently carried out based on observations, and decision-making is carried out based on sample statistics. The use of methods for me

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Dvornikov, S. V. "Electromagnetic Accessibility of Starlink User Terminals." Proceedings of Telecommunication Universities 9, no. 6 (2023): 34–41. http://dx.doi.org/10.31854/1813-324x-2023-9-6-34-41.

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The results of assessing the electromagnetic accessibility of radio emission sources of the Starlink satellite communication system are presented. The features of the organizational and technical structure of the system are considered. Its main technical capabilities for organizing the provision of telecommunications services to users of subscriber terminals are analyzed. The technical features of the infrastructure of the Starlink satellite communication system, which are essential for the electromagnetic accessibility of its sources, have been studied. The possibility of radio links for tran

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Mendakulov, Zh K., S. Morosi, A. Martinelli, and K. Zh Isabaev. "Investigation of the possibility of reducing errors in determining the coordinates of objects indoors by multi-frequency method." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 1 (2021): 137–44. http://dx.doi.org/10.33271/nvngu/2021-1/137.

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Purpose. To investigate the influence of LOS/NLOS conditions on the radio signal propagation and the possibility of interference mitigation by using multi-frequency method of transmitting and receiving for positioning tasks in enclosed spaces. To check the difference in measurement accuracy when receiving a signal at one frequency from receiving a signal at four frequencies by combining the measurement results of individual frequencies into one reading. To check the influence of various obstacles on the signal passing. Methodology. Design at the laboratory of UHF generator and BLE beacons with

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Luis, Diana, Vincent Fitzgerald Giangaspero, Alan Viladegut, Andrea Lani, Adriano Camps, and Olivier Chazot. "Effect of electron number densities on the radio signal propagation in an inductively coupled plasma facility." Acta Astronautica 212 (November 7, 2023): 408–23. https://doi.org/10.1016/j.actaastro.2023.07.028.

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Spacecraft entering a planetary atmosphere are surrounded by a plasma layer containing high levels of ionization, due to the extreme temperatures in the shock layer. The high electron number densities cause attenuation of the electromagnetic waves emitted by the on-board antennas, leading to communication blackout for several minutes. This work presents experimental measurements of signal propagation through an ionized plasma flow. The measurements are conducted at the VKI plasma wind tunnel (Plasmatron) using conical horn antenn

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13

Carotenuto, Riccardo, Fortunato Pezzimenti, Francesco G. Della Corte, Demetrio Iero, and Massimo Merenda. "Ranging with Frequency Dependent Ultrasound Air Attenuation." Sensors 21, no. 15 (2021): 4963. http://dx.doi.org/10.3390/s21154963.

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Measuring the distance between two points has multiple uses. Position can be geometrically calculated from multiple measurements of the distance between reference points and moving sensors. Distance measurement can be done by measuring the time of flight of an ultrasonic signal traveling from an emitter to receiving sensors. However, this requires close synchronization between the emitter and the sensors. This synchronization is usually done using a radio or optical channel, which requires additional hardware and power to operate. On the other hand, for many applications of great interest, low

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14

Samad, Md Abdus, and Dong-You Choi. "Learning-Assisted Rain Attenuation Prediction Models." Applied Sciences 10, no. 17 (2020): 6017. http://dx.doi.org/10.3390/app10176017.

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Rain attenuation becomes significant to degrade the earth-space or terrestrial radio link’s signal-to-noise ratio (SNR). So, to maintain the desired SNR level, with the help of fade mitigation techniques (FMTs), it needs to control transmitted signals power considering the expected rainfall. However, since the rain event is a random phenomenon, the rain attenuation that may be experienced by a specific link is difficult to estimate. Many empirical, physical, and compound nature-based models exist in the literature to predict the expected rain attenuation. Furthermore, many optimizations and de

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15

Dvornikov, Sergey V., Evgeniy V. Markov, and Adjan A. Manoshi. "NCREASING IMMUNITY OF DECAMETER RADIO CHANNEL TRANSMISSIONS UNDER UNINTENDED INTERFERENCE." T-Comm 15, no. 6 (2021): 4–9. http://dx.doi.org/10.36724/2072-8735-2021-15-6-4-9.

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The transmission of messages is a complex process, which is largely determined by the properties of the radio channel used. Decameter radio channels are the most difficult for organizing communication, since the ionospheric propagation of radio waves is associated with their significant attenuation, due to the significant length of the paths, as well as the presence of Rayleigh fading in the channel. However, the possibility of transmitting information over long distances without serious resource costs stimulates further research to improve the reliability of decameter radio communication. In

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16

Zainal, Izzah Hazirah, Zaiton Abdul Mutalip, Haziezol Helmi Mohd Yusuf, Nurmala Irdawaty Hassan, and Zeina Rihawi. "Comparing 5G indoor wireless technologies: optical vs ultraviolet communication." International Journal of Advances in Applied Sciences 13, no. 3 (2024): 611. http://dx.doi.org/10.11591/ijaas.v13.i3.pp611-619.

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Wireless communication technologies have become one of the biggest technologies that are considered suitable for radio frequency in various types of applications, including indoor applications. This study investigates the differences between optical wireless communication (OWC) and ultraviolet wireless communication (UVC). Several parameters are simulated, including bit error rate (BER), signal-to-noise ratio (SNR), data rate, and received power, to compare the performance of each technology in various scenarios. Owing to its wide bandwidth, license-free frequency spectrum, and low signal atte

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Izzah, Hazirah Zainal, Abdul Mutalip Zaiton, Helmi Mohd Yusuf Haziezol, Irdawaty Hassan Nurmala, and Rihawi Zeina. "Comparing 5G indoor wireless technologies: optical vs ultraviolet communication." International Journal of Advances in Applied Sciences (IJAAS) 13, no. 3 (2024): 611–19. https://doi.org/10.11591/ijaas.v13.i3.pp611-619.

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Wireless communication technologies have become one of the biggest technologies that are considered suitable for radio frequency in various types of applications, including indoor applications. This study investigates the differences between optical wireless communication (OWC) and ultraviolet wireless communication (UVC). Several parameters are simulated, including bit error rate (BER), signal-to-noise ratio (SNR), data rate, and received power, to compare the performance of each technology in various scenarios. Owing to its wide bandwidth, license-free frequency spectrum, and low signal atte

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18

Trilochan, Patra, and Kumar Mitra Swarup. "Application of a Trellis Coded Modulation to Ameliorate the 5G Communication for Tropical Regions." Indian Journal of Science and Technology 16, no. 1 (2024): 37–46. https://doi.org/10.17485/IJST/v16i1.2079.

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ABSTRACT <strong>Objectives:</strong> To minimize the bit error rate and enhance the radio signal power by an application of the Trellis Coded Modulation (TCM) for the Fifth Generation (5G) technology in tropical regions. <strong>Methods:</strong> Various diversity techniques have been adopted to diminish the Bit Error Rate. A Communication link model has been proposed in this work and an STBC MIMO system (Space-Time Block Coding multiple-input multiple-output) has been applied to enhance the diversity gain and coding gain of the proposed model. The said model has been implement

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19

Hamza, Ekhlas Kadhum, Sameir A. Aziez, Ahmed Hameed Reja, and Ahmad H. Sabry. "Identifying some regularities of radio frequency propagation of a radar system by analyzing different environmental effects." Eastern-European Journal of Enterprise Technologies 5, no. 9(119) (2022): 61–67. http://dx.doi.org/10.15587/1729-4061.2022.264093.

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Free space path loss is a function of frequency and propagation distance and the RF signal propagates at light speed in all directions in free space. The performance evaluation of wireless and radar communication technologies is related to understanding the propagation environments. This work presents the modeling of several RF propagation properties that include atmospheric attenuation due to rain, free space path loss, gas, and fog, as well as multipath propagations caused by ground bounces. The methodology discusses the developed model according to the series of (ITU) International Telecomm

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20

Pestrikov, Viktor. "Michael Pupin and Pupinization of Telephone Lines." Infocommunications and Radio Technologies 5, no. 2 (2022): 260–93. http://dx.doi.org/10.29039/2587-9936.2022.05.2.20.

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The scientific ways that led the American radio engineer Michael Pupin to the development of telephone technologies aimed at improving the quality of an audio signal when it is transmitted over long distances are considered. Pupin’s important inventions in the field of long-distance telephony are investigated. His theories of using inductors to reduce the attenuation of the transmitted telegraph and telephone signal over the cable by artificially increasing its inductance are described. Attention is paid to the dispute between Pupin and Campbell in the primacy of the invention of load coils an

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21

Marsic, Vlad, Tazdin Amietszajew, Christopher Gardner, Petar Igic, Soroush Faramehr, and Joe Fleming. "Impact of Li-Ion Battery on System’s Overall Impedance and Received Signal Strength for Power Line Communication (PLC)." Sensors 22, no. 7 (2022): 2634. http://dx.doi.org/10.3390/s22072634.

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In anticipation of the hybrid utilisation of the radio frequency (RF) wireless transceiver technology embedded in future smart Li-ion battery cells to deliver hybrid links based on power line communication (PLC) and wireless connections, herein we present an empirical high-frequency investigation of the direct current (DC) bus. The focus is to determine, via statistical tools including correlation coefficient (CC), root mean squared error (RMSE) and feature selective validation (FSV) method, the impedance and signal change impact on a possible communication link when fully charged cells are pr

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Medina-Acosta, G. A., and José A. Delgado-Penín. "Opportunistic Communication (Cognitive Radio) over Primary Discarded Subchannels by Applying a Double Power Distribution." International Journal of Digital Multimedia Broadcasting 2010 (2010): 1–9. http://dx.doi.org/10.1155/2010/823494.

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This paper proposes the establishment of a simultaneous cognitive radio communication based on a subdistribution of power made over unselected subchannels which were discarded by the primary user through an initial optimal power allotment. The aim of this work is to show the possibility of introducing an opportunistic communication into a licensed transmission where the total power constraint is shared. The analysis of the proposed transmission scheme was performed by considering 128 and 2048 independent subchannels affected byRayleighfading, over 10,000 channel realizations, and three differe

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Khalili, Hamed, Hannes Frey, and Maria A. Wimmer. "Balancing Prediction Accuracy and Explanation Power of Path Loss Modeling in a University Campus Environment via Explainable AI." Future Internet 17, no. 4 (2025): 155. https://doi.org/10.3390/fi17040155.

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For efficient radio network planning, empirical path loss (PL) prediction models are utilized to predict signal attenuation in different environments. Alternatively, machine learning (ML) models are proposed to predict path loss. While empirical models are transparent and require less computational capacity, their predictions are not able to generate accurate forecasting in complex environments. While ML models are precise and can cope with complex terrains, their opaque nature hampers building trust and relying assertively on their predictions. To fill the gap between transparency and accurac

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Rodríguez, José-Víctor, Mats Gustafsson, José-María Molina-García-Pardo, Leandro Juan-Llácer, and Ignacio Rodríguez-Rodríguez. "Frequency-Selective Wallpaper for Indoor Interference Reduction and MIMO Capacity Improvement." Symmetry 12, no. 5 (2020): 695. http://dx.doi.org/10.3390/sym12050695.

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This paper presents the design and features of frequency-selective wallpaper—based on periodic and symmetric metallic hexagons—intended to be attached to standard walls for filtering out 5 GHz signals (e.g., IEEE 802.11a systems) without blocking other selected radio communication services (e.g., cellular mobile communication signals). It analyzes the characteristics of the radio channel—as found within standard indoor environments—with both regular walls and walls with the proposed frequency-selective wallpaper, examined using a ray-launching program for single-input single-output (SISO) and

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Majoral, M., J. Arribas, and C. Fernández-Prades. "Implementation of a High-Sensitivity Global Navigation Satellite System Receiver on a System-on-Chip Field-Programmable Gate Array Platform." SENSORS 24, no. 5 (2024): 1416. https://doi.org/10.3390/s24051416.

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This paper presents the design, proof-of-concept implementation, and preliminary performance assessment of an affordable real-time High-Sensitivity (HS) Global Navigation Satellite System (GNSS) receiver. Specifically tailored to capture and track weak Galileo E1b/c signals, this receiver aims to support research endeavors focused on advancing GNSS signal processing algorithms, particularly in scenarios characterized by pronounced signal attenuation. Leveraging System-on-Chip Field-Programmable Gate Array (SoC-FPGA) technology, this design merges the adaptability of Software Defined Radio (SDR

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Musa, Ahmed, Haytham Bany Salameh, and Ayat Olaimat. "Simulation-Based Optical Threshold Component Design for Mitigating Four-Wave Mixing Effects in WDM Radio Over Fiber Systems." Journal of Optical Communications 41, no. 4 (2020): 429–36. http://dx.doi.org/10.1515/joc-2017-0212.

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AbstractThe gigantic demand on high bandwidth and capacity has triggered the need to use the radio over optical fiber (RoF) systems. RoF systems offer several attractive features such as low attenuation loss, large bandwidth, less interference, etc., which can improve the communication system reliability and achieve high data rates. However, the RoF system suffers from linear and nonlinear fiber impairments, which result in signal distortion. Several solutions have been proposed to overcome linear impairments; on the other hand, the nonlinear impairments issue is still a challenging problem in

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Kim, Yongho, Jongho Kim, Jinhyung Oh, Youngkeun Yoon, Sangwook Park, and Jaegon Lee. "Rain Attenuations Based on Drop Size Distribution (DSD) Model and Empirical Model at Low THz Frequencies." Electronics 13, no. 1 (2023): 9. http://dx.doi.org/10.3390/electronics13010009.

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Rain attenuation based on the drop size distribution (DSD) with different rainfall rates (R) at low THz frequencies is investigated in this paper. The rain attenuation is calculated using the DSD measured for one year and the extinction cross-section (ECS) by the Mie scattering theory. Moreover, the obtained specific rain attenuation is verified by the empirical model using the measurement system consisting of a transmitter, a receiver, and weather measurement units. We measured the received power against the uniform transmitted power at 240, 270, and 300 GHz on the rooftop of the National Rad

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Majoral, Marc, Javier Arribas, and Carles Fernández-Prades. "Implementation of a High-Sensitivity Global Navigation Satellite System Receiver on a System-on-Chip Field-Programmable Gate Array Platform." Sensors 24, no. 5 (2024): 1416. http://dx.doi.org/10.3390/s24051416.

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This paper presents the design, proof-of-concept implementation, and preliminary performance assessment of an affordable real-time High-Sensitivity (HS) Global Navigation Satellite System (GNSS) receiver. Specifically tailored to capture and track weak Galileo E1b/c signals, this receiver aims to support research endeavors focused on advancing GNSS signal processing algorithms, particularly in scenarios characterized by pronounced signal attenuation. Leveraging System-on-Chip Field-Programmable Gate Array (SoC-FPGA) technology, this design merges the adaptability of Software Defined Radio (SDR

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Yahyaoui, Moussa El, Ali El Moussati, and Kamel Haddadi. "Performance Evaluation of 60-GHz-WPAN System Distributed Over Multi-Mode Fiber." International Journal of Electronics and Telecommunications 63, no. 4 (2017): 381–87. http://dx.doi.org/10.1515/eletel-2017-0052.

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Abstract The manuscript deals with the assessment of Radio over Fiber (RoF) system including pure electrical baseband, pure radio frequency band centered around 60 GHz, and hybrid radio-optical system at the same RF band using a global simulation. In this work we focus on RoF solution to improve the low coverage of the 60 GHz channel caused by high free-space attenuation. A realistic co-simulation of the Wireless Personal Area Network (WPAN) IEEE802.15.3c-RoF was performed in a residential environment for Line-Of-Sight (LOS) and Non-Line- Of-Sight (NLOS). In this work, we demonstrated a 60 GHz

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Wu, Xi-An, Zechen Zhang, Hong Liu, and Tong Tian. "The Design of a Wide-Dynamic-Range and High-Linearity RMS Power Detector for mm-Wave Applications in 65 nm CMOS." Electronics 12, no. 21 (2023): 4402. http://dx.doi.org/10.3390/electronics12214402.

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In this paper, a wide dynamic range RMS power detector with an operating frequency from 24 GHz to 35 GHz mm-wave frequency is presented. The power detector is fabricated in a 65 nm CMOS process. It is composed of a power detector unit, a radio frequency signal attenuator and a linear proportional voltage adder. The equalization technique is used to achieve a good linearity performance. The input dynamic range of the power detector is expanded by using one radio frequency signal attenuator and five power detector units. The simulation results show the slope of VOUT versus input power remaining

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Ashidi, Ayodeji Gabriel, Joseph Sunday Ojo, Oluwaseyi Julius Ajayi, and Toluwalope Mary Akinmoladun. "Evaluation of Concurrent Variation in Rain Specific Attenuation and Tropospheric Amplitude Scintillation Over Akure, Southwest Nigeria." Earth Systems and Environment 5, no. 3 (2021): 547–59. http://dx.doi.org/10.1007/s41748-021-00225-6.

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AbstractRain constitutes a major limitation to the performance and use of terrestrial and satellite communication systems with operational frequencies greater than 10 GHz. The situation gets further complicated by fast fluctuations in the received signal amplitude due to in homogeneities in atmospheric weather conditions; a phenomenon known as amplitude scintillation. The concurrent evaluation of the two phenomena guarantees a better fade margin determination for the planning of radio communication over any location. This work employs 3 years of in-situ measurement of temperature, humidity, ra

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Al Moshi, Md Adnan, Marcus Hardie, Tanveer Choudhury, and Joarder Kamruzzaman. "Wireless Underground Sensor Communication Using Acoustic Technology." Sensors 24, no. 10 (2024): 3113. http://dx.doi.org/10.3390/s24103113.

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The rapid advancement toward smart cities has accelerated the adoption of various Internet of Things (IoT) devices for underground applications, including agriculture, which aims to enhance sustainability by reducing the use of vital resources such as water and maximizing production. On-farm IoT devices with above-ground wireless nodes are vulnerable to damage and data loss due to heavy machinery movement, animal grazing, and pests. To mitigate these risks, wireless Underground Sensor Networks (WUSNs) are proposed, where devices are buried underground. However, implementing WUSNs faces challen

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Mmahi, Nnenna Okoro, Akinsanmi Akinbolati, Florence N. Ikechiamaka, Francis A. Akpaneno, Emmanuel Joseph, and Kehinde R. Ekundayo. "STUDIES ON SURFACE RADIO REFRACTIVITY OVER SOME SELECTED CITIES IN NORTH-CENTRAL, NIGERIA." FUDMA JOURNAL OF SCIENCES 5, no. 4 (2022): 90–99. http://dx.doi.org/10.33003/fjs-2021-0504-774.

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This research investigated the variations of surface radio refractivity and its propagation effects on radio signal over the cities of Abuja and Ilorin, Nigeria. Six years (2015-2020) satellite data of Temperature, Pressure and Humidity both at the surface (12m) and at 100 m AGL, were used for the study. The data retrieved were used to determine the monthly, seasonal and annual surface radio refractivity values for the locations. Results show that the values of surface radio refractivity (Ns) in Abuja was slightly lower than Ilorin with average values of 335.62 and 351.07 N-Units obtained for

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Akinbolati, A., Idris Adamu, and Tunde Davide Adache. "The Investigation of Surface Radio Refractivity Over Lokoja, Kogi State Nigeria." UMYU Scientifica 3, no. 1 (2024): 144–56. http://dx.doi.org/10.56919/usci.2431.016.

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This research investigated the variation of Surface Radio Refractivity and its propagation effects on radio signals over Lokoja, Kogi State, Nigeria. The study used six years (2015-2020) of satellite data on temperature, pressure, relative humidity and rainfall at the surface (12 km) above ground level. The data retrieved were used to determine the monthly, seasonal, and annual Surface Radio Refractivity value for Lokoja Kogi State. Results show that high Surface Radio Refractivity values were recorded generally during the wet season months compared to the dry season months in all Six years (2

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Zheng, Qinghe, Mingqiang Yang, Deqiang Wang, Xinyu Tian, and Huake Su. "An intelligent wireless communication model based on multi-feature fusion and quantile regression neural network." Journal of Intelligent & Fuzzy Systems 41, no. 6 (2021): 6067–78. http://dx.doi.org/10.3233/jifs-202430.

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Throughout the wireless communication network planning process, efficient signal reception power estimation is of great significance for accurate 5 G network deployment. The wireless propagation model predicts the radio wave propagation characteristics within the target communication coverage area, making it possible to estimate cell coverage, inter-cell network interference, and communication rates, etc. In this paper, we develop a series of features by considering various factors in the signal transmission process, including the shadow coefficient, absorption coefficient in test area and bas

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Jia, Jinwei, Min Gao, Yuying Liang, Xinyu Dao, Yuanwei Yin, and Zhuangzhi Han. "Research on Optimal Convergence Design of Low Intercept Point-Like Beam for FDA-MIMO Radio Detector Based on Beam Entropy." Entropy 27, no. 4 (2025): 421. https://doi.org/10.3390/e27040421.

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The technology of anti-informational interference is a research hotspot in radio detectors. According to the workflow of first interception and then interference for the jammer, improving low interception can fundamentally improve the anti-jamming ability of the radio detector. Airspace low interception is one of the most promising research directions. FDA-MIMO technology holds significant potential for application in this field. Therefore, this paper investigates the design principle of an FDA-MIMO radio detector with low beam entropy. From the perspectives of information acquisition and coun

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Klaina, Hicham, Ana Vazquez Alejos, Otman Aghzout, and Francisco Falcone. "Narrowband Characterization of Near-Ground Radio Channel for Wireless Sensors Networks at 5G-IoT Bands." Sensors 18, no. 8 (2018): 2428. http://dx.doi.org/10.3390/s18082428.

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In this contribution, a narrowband radio channel model is proposed for rural scenarios in which the radio link operates under near-ground conditions for application in wireless sensor networks dedicated to smart agriculture. The received power attenuation was measured for both transmitter and receiver antennas placed at two different heights above ground: 0.2 and 0.4 m. Three frequency ranges, proposed for future 5G-IoT use case in agriculture, were chosen: 868 MHz, 2.4 GHz and 5.8 GHz. Three ground coverings were tested in a rural scenario: soil, short and tall grass fields. The path loss was

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Pishchin, Oleg Nickolaevich, and Dmitriy Sergeevich Puzankov. "Models for calculating the distribution of the electromagnetic field power level in mobile radio communication systems for short distances in summer." Vestnik of Astrakhan State Technical University. Series: Management, computer science and informatics 2024, no. 2 (2024): 111–19. http://dx.doi.org/10.24143/2072-9502-2024-2-111-119.

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The statement is substantiated that for the design of mobile radio communication systems at short distances up to 1 000 m, the main recommended calculation models have a significant error, since they were created for calcula-tions of long distances (as a rule, from 1 to 50 km) and have limitations in application. Due to the fact that at the present stage of development of mobile radio communication systems, the frequency ranges are in intensive research and use not only 900 and 1 800 MHz, but also 450-800 MHz sections, as well as from 2 100 to 6 000 MHz, which were not previously used for cell

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Kakorina, Olesya, Igor Kakorin, and Alexandra Panchenko. "Comparative Analysis of Radio-Absorbing Coatings." NBI Technologies, no. 3 (November 2022): 22–26. http://dx.doi.org/10.15688/nbit.jvolsu.2022.3.4.

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The development of information technologies necessitates the solution of various problems of information security. Physical means of protecting information processed by computer objects include radio-absorbing materials. They prevent the interception of information on electromagnetic radiation and interference in power supply and grounding lines. The general requirements for radar absorbent coatings are: a high level of attenuation of the reflected signal, a wide frequency range of operation and the cost-effectiveness of the structure during its manufacture and operation. The ability of a mate

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Lin, Tairan, Xizhang Wei, Jingtong Lai, and Mingcong Xie. "Transmit Beamforming Design Based on Multi-Receiver Power Suppression for STAR Digital Array." Sensors 24, no. 2 (2024): 622. http://dx.doi.org/10.3390/s24020622.

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The simultaneous transmit and receive (STAR) array system provides higher radiation gain and data rate compared to traditional radio system. Because of the various mutual couplings between each pair of transmit and receive elements, it is a great challenge to suppress the incident self-interference power at multiple receive elements, which is usually much higher than the desired signal of interest (SoI) power and causes the saturation of receive links and the distortion of the digital SoI. In this paper, we propose an optimized method for transmit beamforming based on radiation power constrain

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Asiain, David, and Diego Antolín. "LoRa-Based Traffic Flow Detection for Smart-Road." Sensors 21, no. 2 (2021): 338. http://dx.doi.org/10.3390/s21020338.

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This paper presents a wireless traffic flow detection system, mainly focused on conditions in which the traffic flow is slow or stopped, which increases the risk of highway accidents. To achieve this goal, a Low Power Wide Area Network (LPWAN) based on LoRa called Short LoRa has been developed. This LoRa sub-network complies with the European Telecommunications Standards Institute (ETSI) harmonized standard for its compatibility in Europe countries. In addition, the development of the devices has allowed them to also work on a LoRaWAN network. The introduced development has been compared to a

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Revenko, V. Yu. "RADAR CHARACTERISTICS OF PRECIPITATION AFFECTING THE TRACKING OF SHIP’S RADAR OBJECTS." Shipping & Navigation 33, no. 1 (2022): 106–10. http://dx.doi.org/10.31653/2306-5761.33.2022.106-110.

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In this paper, we consider the possibility of using the radar characteristics under precipitation conditions in order to reduce the echo signal’s negative impact on the object tracking performed by the ship’s radar. Precipitation particles’ size, state (solid or liquid phase), shape, and the factors that determine their combined action play an important role in echo signal formation. The rain particles’ size in comparison with the wavelength of the ship’s radar may contribute to the creation of a larger or smaller noise echo signal on the ship’s radar display. This signal’s power in the Raylei

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Akinbolati, Akinsanmi, and Moses Oludare Ajewole. "EFFECT OF SOME RADIO CLIMATIC FACTORS ON DIGITAL TERRESTRIAL TELEVISION SIGNAL IN A SAHEL SAVANNAH CITY OF NIGERIA." FUDMA JOURNAL OF SCIENCES 4, no. 2 (2020): 111–18. http://dx.doi.org/10.33003/fjs-2020-0402-150.

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This study investigates the effect of some radio climatic factors on the Received Signal Strength (RSS) of a Digital Terrestrial Television Broadcast Station (DTTBS) in Katsina City, Nigeria. The RSS was measured at intervals along selected routes around the station using a digital signal strength meter. GPS receiver was used to log the line of sight, geographic coordinates and heights of data points from the station. The atmospheric pressure, temperature and humidity corresponding to data points were concurrently measured using a compact weather station whereas the corresponding surface radio

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Li, Guang. "A High Speed Radio on Fiber Based on Optical Double-Sidebands via Optical Filter and Optical Phase Modulation." Advanced Materials Research 988 (July 2014): 636–39. http://dx.doi.org/10.4028/www.scientific.net/amr.988.636.

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We demonstrate a system scheme of generating and transmitting base-band and radio frequency signal based on optical double-sidebands scheme to generate optical millimeter-wave signal via optical phase modulation (OPM) and FBG. The system architecture with the source of laser at central station, the data re-modulation on downlink optical carrier gained from one base station is a good method to reduce the cost of uplink transmitter, for it does not needs the source of laser and wavelength administration at the base station. The optical phase modulator is inexpensive and mature. The downlink comm

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Gu, Youzhang, Seunghyun Roh, Wuguan Lin, YooSeok Jung, and Yoon-Ho Cho. "Investigation of the Signal Reach Performance of the Ultra-High-Frequency Identification Tag for Underground Utility Management." Applied Sciences 13, no. 4 (2023): 2294. http://dx.doi.org/10.3390/app13042294.

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The historical management of underground utilities such as communication lines, water and sewage pipes, and power lines is essential for their effective use. However, due to the nature of the buried facilities, detecting and tracking them are challenging, although various solutions are difficult to apply in the field, especially optical cables, which are mainly used for communication, making it more difficult to apply existing solutions. There has been limited research on the practicalities of solutions, especially on multilayer structures such as road pavements. Based on a literature review,

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SABRIL, MUHAMMAD SAFIY, FAEZAH JASMAN, NURUL ADILAH ABDUL LATIFF, SEVIA MAHDALIZA IDRUS, and WAN HAFIZA WAN HASSAN. "THE PERFORMANCE ANALYSIS OF OPTICAL WAVE PROPAGATION FOR UNDERWATER WIRELESS COMMUNICATION." Universiti Malaysia Terengganu Journal of Undergraduate Research 2, no. 3 (2020): 73–82. http://dx.doi.org/10.46754/umtjur.v2i3.167.

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Underwater wireless communications refer to transmitting data in an unguided water environment by wireless carriers including acoustic, radio frequency (RF), and optical waves. Relative to acoustic and RF, the optical wave is more promising to offer higher bandwidth at a lower energy consumption rate. However, an optical wave has its challenges such as attenuation due to absorption, scattering and turbulence effects. Therefore, this work attempts to investigate the performance of lightwave propagation for underwater optical wireless communication (UOWC) using simulation and experimental approa

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Cama-Pinto, Dora, Miguel Damas, Juan Antonio Holgado-Terriza, et al. "Empirical Model of Radio Wave Propagation in the Presence of Vegetation inside Greenhouses Using Regularized Regressions." Sensors 20, no. 22 (2020): 6621. http://dx.doi.org/10.3390/s20226621.

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Spain is Europe’s leading exporter of tomatoes harvested in greenhouses. The production of tomatoes should be kept and increased, supported by precision agriculture to meet food and commercial demand. The wireless sensor network (WSN) has demonstrated to be a tool to provide farmers with useful information on the state of their plantations due to its practical deployment. However, in order to measure its deployment within a crop, it is necessary to know the communication coverage of the nodes that make up the network. The multipath propagation of radio waves between the transceivers of the WSN

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Shamsan, Zaid A., Moath Alammar, Abdullah Alharthy, Abdulaziz Aldahmash, Khalid. A. Al-Snaie, and Al-Hetar Abdulaziz M. "Micrometer and Millimeter Wave P-to-P Links Under Dust Storm Effects in Arid Climates." Engineering, Technology & Applied Science Research 9, no. 4 (2019): 4520–24. https://doi.org/10.5281/zenodo.3370723.

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A dust storm is the main attenuation factor that can disturb receiving radio signals in arid climate condition as in Saudi Arabia. This paper presents a study on the effect of dust storms on the received radio frequency power in a homogenous environment in the city of Riyadh. A number of micrometer and millimeter wave links have been considered along with several measured dust storm data to investigate the dust storm effects. The results showed that dust storm can critically influence the communication link and this effect grows up as the physical distance between the transmitter and the recei

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Chub, A. V., K. N. Abramova, K. D. Ikonnikova, Ye S. Zhechev, and T. T. Gazizov. "ELECTROMAGNETIC INTERFERENCE ATTENUATION IN A STRUCTURE WITH DOUBLE MODAL REDUNDANCY." Bulletin of the South Ural State University. Ser. Computer Technologies, Automatic Control & Radioelectronics 25, no. 1 (2025): 53–68. https://doi.org/10.14529/ctcr250105.

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This paper examines a method for enhancing the fault tolerance of radio-electronic equipment, termed modal redundancy, which combines the principles of redundancy and modal filtering. The essence of this method lies in utilizing strong electromagnetic coupling between two or more redundant conductors to mitigate electromagnetic interference. This approach offers several advantages, as the system can continue to operate even in the event of failure of one or more conductors, which is crucial for ensuring uninterrupted device operation. The modal redundancy method is effective in situations wher

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Oyeleke, O., M.O Olatinwo, and M. Sanni. "Determination of Radio Frequency Attenuation Signals of Ajilete FM (92.1MHz) and Compared with Existing Friis Formula, along Gambari-Oyo Road, Nigeria." International Journal of Engineering Research & Science 4, no. 2 (2018): 12–18. https://doi.org/10.5281/zenodo.1187565.

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<em>This work  measured experimentally, and calcula</em>t<em>ed theoretically using the existing Friis Fomula, the Attenuation of 92.1 MHz (Ajilete FM) Signals along Gambari(Lat 8<sup>o</sup>29<sup>1</sup>N; Long 4<sup>o</sup>29<sup>1</sup>) – Oyo-Road(Lat 7<sup>o</sup>50<sup>1</sup>N; Long 3<sup>o</sup>56<sup>1</sup>E), Oyo State Nigeria. The two results were compared. The experimental Measurement campaign was achieved by using an appropriate design dipole antenna, well matched to (810 GSP Analyser), to determine the attenuation. The calculated results correlated very well with the

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