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Thematische Bibliographien / Radio frequency signal transmission / Zeitschriftenartikel

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Zeitschriftenartikel zum Thema „Radio frequency signal transmission“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 29. Juli 2025

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1

Bai, Jiang Ling, Li Bin Zhong, Wen Hai Xu, and Jian Lin. "Research on Optical Signal Carrier Transmission Technology." Advanced Materials Research 1022 (August 2014): 193–96. http://dx.doi.org/10.4028/www.scientific.net/amr.1022.193.

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This paper studies the single-sideband RF signals in the optical carrier side than the problem. RF signals modulated optical carrier OSSB + C modulation index is usually small, leading edge modulated carrier radio frequency signal generated by the optical carrier ratio is not ideal. A design scheme based on three-arm and four-arm MZM MZM optimized optical carrier single sideband radio frequency signal containing the edge ratio. By adjusting the DC bias voltage of the modulator can control the carrier side than the light signal. For any modulation index, are able to make the optical carrier sin

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Andreiev, O., V. Tsyporenko, V. Tsyporenko, Y. Andreieva, O. Dubyna, and I. Puleko. "ELECTROMAGNETIC COMPATIBILITY OF BROADBAND AND NARROWBAND SHORTWAVE RADIO COMMUNICATIONS DEVICES." Sciences of Europe, no. 158 (February 10, 2025): 78–86. https://doi.org/10.5281/zenodo.14846872.

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Most short-wave radio communication means use frequency modulation of the radio signal in a limited frequency band to transmit voice signals. Such signals have a sufficiently high spectral density, which makes it possible to detect and suppress the radio signal by means of electronic warfare. One of the methods for increasing the noise immunity of radio communication means is to expand the radio signal spectrum at the operating frequency of the transmitter. In modern telecommunication systems, various technologies for expanding the signal spectrum have been used when transmitting data over a m

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Logarasu, R., and Dr R. Dhanasekaran. "VLC signal reconstruction with wavel transform in turbulence environment." International Journal of Engineering & Technology 7, no. 2.20 (2018): 178. http://dx.doi.org/10.14419/ijet.v7i2.20.12803.

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Communication involves exchange of data between sender and receiver. The data exchange complexity reduce with wireless data transmission. Conventionally radio signals use for wireless data transmission. The radio frequency limited band width and requirement of new hardware installation make LIFI an optimal solution for wireless data transmission. Since the existing LEDs can be used for data transmission. Recent trends in LiFi have made it possible to transmit data at THz frequency. However, the LiFi signals easily degrade due to surrounding environment noise. In this paper, we propose to recon

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Sudibya, Bambang, Denny Dermawan, Muhammad Jalu Purnomo, and Mardiana Irawaty. "Radio Transmission Detection Using Doppler in UHF Frequency Band." AVITEC 4, no. 1 (2022): 89. http://dx.doi.org/10.28989/avitec.v4i1.1185.

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The direction finder of a radio transmitter is a device that functions to find and determine the direction of a radio transmitter that works in the Ultra High Frequency (UHF) band. UHF frequency used is in the range of 420 - 440 MHz. The concept of Doppler radio is used as a method to determine the direction a radio transmitter is located. Radio Doppler use four receiving antennas which are installed at a certain distance so that it can produce a difference in frequency (Doppler) on each radio antenna because of the difference in the angle of the detected signal. The direction of the incoming

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Nikolaev, A. V., E. I. Starovoitov, D. V. Fedosov, A. V. Kolesnikov, and M. A. Filin. "Navigation Technology of Unmanned Vehicles Based on Electromagnetic Induction." Mekhatronika, Avtomatizatsiya, Upravlenie 24, no. 11 (2023): 583–89. http://dx.doi.org/10.17587/mau.24.583-589.

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The article deals with the issues of determining the position of unmanned vehicles (UV) in tunnels in the absence of signals from global navigation satellite systems (GNSS) and unfavorable operating conditions, such as low light, high humidity, radioactivity and others. The authors proposes a method for navigating unmanned vehicles based on the phenomenon of electromagnetic induction. On board the unmanned vehicle there is a high-frequency generator, a radio transmitting unit, a radio receiving unit, an information management system, and under the bearing or supporting surface of the unmanned

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Randy, B. Renil, M. Hariharan, and R. Arasa Kumar. "Secured Wireless Power Transmission Using Radio Frequency Signal." International Journal of Information Sciences and Techniques 4, no. 3 (2014): 115–22. http://dx.doi.org/10.5121/ijist.2014.4315.

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B., Renil Randy, M.Hariharan, and Arasa Kumar R. "SECURED WIRELESS POWER TRANSMISSION USING RADIO FREQUENCY SIGNAL." International Journal of Information Sciences and Techniques (IJIST) 4, no. 3 (2014): 115–22. https://doi.org/10.5281/zenodo.7024176.

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Anything we transmit without protection is being raid by the intruders. Hence it is necessary to impart security to the signal transmitted. In this paper we present the concept of giving security to the transmitted power signal which is to be received by a receiver in a wireless medium. The present techniques of wireless power transmission consists of a pair of strongly magnetically coupled resonators that allow power transmission of tens of watts over a few meters, but anything without security becomes unreliable. With the goal in achieving security to the power signal, we introduce the conce

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MD., AHSAN HABIB, MASUM BILLAH MD., and MAMUN UR RASHID MD. "VHF RF SIGNAL GENERATION AND TRANSMISSION USING FREQUENCY MODULATION." Asian Journal of Current Research 3, no. 1 (2018): 1–8. https://doi.org/10.5281/zenodo.1407879.

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In electronic communications, the radio frequency spectrum (RF Signal) is widely used in all the modern communication systems. The generation and transmission of RF signal can be accomplished by various modulation techniques. Frequency modulation is such a technique. The communication through cordless & Cell phones, radio and TV broadcast stations, satellite communication systems, Bluetooth module and Wi-Fi is now becoming an essential part of human life. All these systems use RF spectrums for communication. The sound coming out from the modern communicating devices is Frequency Modulated

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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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Wang, An. "Research on characteristics of radio interference of MMC-HVDC lines." Journal of Physics: Conference Series 2814, no. 1 (2024): 012038. http://dx.doi.org/10.1088/1742-6596/2814/1/012038.

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Abstract Previous research on radio interference in DC lines has focused on radio interference caused by corona discharge. But with the development of Modular Multilevel Converter Based High Voltage Direct Current (MMC-HVDC) systems, high frequency signals generated by fast switching of Insulate-Gate Bipolar Transistor (IGBT) are transmitted to Direct Current (DC) lines and radiate radio interference outward. On the one hand, the radio interference formula recommended by the dual-level DC transmission line recommended by International Special Committee on Radio Interference (CISPR) is calculat

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Thompson, Charles, Lejun Hu, Grace Remillard, Kavitha Chandra, Vacharaporn Paradorn, and Azizat Lawal. "A passive radio frequency excited acoustic transducer." Journal of the Acoustical Society of America 151, no. 4 (2022): A57. http://dx.doi.org/10.1121/10.0010645.

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The physical processes that govern the operation of a passive acoustic transducer driven into operation by a broadcast radio-frequency electromagnetic wave are presented. The transducer is comprised of a re-entrant cavity resonator operating in its resonant TEM mode and a sensing membrane. By displacing the membrane using the acoustic pressure, one can generate an amplitude modulated radio frequency signal proportional to the product of the displacement and the excitation signal. One may use the backscattered electromagnetic signal to recover the audio signal. The results for power generation,

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Buhaiov, M., and B. Molodetskyi. "ALGORITHM FOR AUTOMATIC DETECTION OF UNMANNED AERIAL VEHICLES COMMAND AND TELEMETRY RADIO LINES IN SOPHISTICATED ELECTRONIC ENVIRONMENT." Проблеми створення, випробування, застосування та експлуатації складних інформаційних систем, no. 26 (I) (August 8, 2024): 4–19. http://dx.doi.org/10.46972/2076-1546.2024.26.01.

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Recently, the use of unmanned aerial vehicles for both reconnaissance and fire strikes has been increasing. The control of such vehicles and the transmission of telemetry information are carried out using a combined command and telemetry radio link and frequency hopping spread spectrum technology. In such conditions, the task of developing automatic algorithms for detecting and separating radio links for portable radio monitoring devices becomes especially relevant. The aim of this work is to extend the capabilities of portable radio monitoring devices to detect unmanned aerial vehicles’ radio

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Lutfi Apriyadi, Sabila Sofyana Zahra, Sabrina Nadya Octaviani, and Diyajeng Luluk Karlina. "Analisis Pengaplikasian Medan Elektromagentik Terhadap Gelombang Radio Frekuensi Tinggi." Venus: Jurnal Publikasi Rumpun Ilmu Teknik 2, no. 6 (2024): 150–58. https://doi.org/10.61132/venus.v2i6.636.

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The electromagnetic field on high-frequency radio waves and its impact on signal transmission quality. High-frequency radio waves, used in wireless communication, can be affected by electromagnetic fields from various external sources, such as electronic equipment and building structures. This study analyzes the interaction between electromagnetic fields and radio waves, as well as their impact on transmission speed and signal range. The analysis results show that electromagnetic fields can cause distortion or interference in radio waves, affecting the quality of the received signal. This stud

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Wang, Jialiang. "RF Circuit EMI Suppression and EMC Analysis." Highlights in Science, Engineering and Technology 27 (December 27, 2022): 820–25. http://dx.doi.org/10.54097/hset.v27i.3851.

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The radio frequency circuit will generate strong electromagnetic interference in the process of signal transmission, and its own resistance to electromagnetic interference is weak, and the radio frequency circuits operating in the same electromagnetic environment are prone to mutual interference. Therefore, it is necessary to analyze the electromagnetic interference effect of radio frequency circuits, and then find effective suppression measures, build a good public electromagnetic environment, realize electromagnetic compatibility, and ensure the reliability of signal transmission. This resea

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Nawaz, Tassadaq, and Ali Alzahrani. "Machine-Learning-Assisted Cyclostationary Spectral Analysis for Joint Signal Classification and Jammer Detection at the Physical Layer of Cognitive Radio." Sensors 23, no. 16 (2023): 7144. http://dx.doi.org/10.3390/s23167144.

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Cognitive radio technology was introduced as a possible solution for spectrum scarcity by exploiting dynamic spectrum access. In the last two decades, most researchers focused on enabling cognitive radios for managing the spectrum. However, due to their intelligent nature, cognitive radios can scan the radio frequency environment and change their transmission parameters accordingly on-the-fly. Such capabilities make it suitable for the design of both advanced jamming and anti-jamming systems. In this context, our work presents a novel, robust algorithm for spectrum characterisation in wideband

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Dmitriev, Alexandr K., Alexander P. Karpik, Alexsander S. Tolstikov, et al. "Measuring the gravitational frequency shift in a hydrogen clock when transmitting a signal via optical and radio frequency communication channels." Analysis and data processing systems, no. 4 (December 27, 2024): 59–77. https://doi.org/10.17212/2782-2001-2024-4-59-77.

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A scheme for measuring the gravitational frequency shift of hydrogen clocks during their movement between two points located at different orthometric altidudes with simultaneous signal transmission via radio and fiber-optic communication lines has been implemented. Practical interest in studying the gravitational frequency shift of quantum standards is associated with the need to take it into account to improve accuracy in navigation satellite systems. Such measurements were performed using a space synchronization channel using signals from global navigation satellite systems. This became espe

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Pievtsov, H., and M. Oleschuk. "THE METHOD OF ADJUSTING THE MULTI-FREQUENCY PROBING RADAR SIGNAL PARAMETERS AND THE TROPOSPHERIC RADIO WAVEGUIDE CHARACTERISTICS." Наукові праці Державного науково-дослідного інституту випробувань і сертифікації озброєння та військової техніки 18, no. 4 (2023): 84–88. http://dx.doi.org/10.37701/dndivsovt.18.2023.12.

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Peculiarities of air circulation in the coastal zone of large reservoirs (large lakes or inland seas such as the Black and Azov Seas) can lead to a significant departure from the standard spatial distribution of meteorological and, accordingly, radiophysical characteristics of air. As a result, it is possible for regions of space with an abnormally low attenuation level of radio waves of certain frequency ranges to appear – tropospheric radio waveguides (TWG). The appearance of TWG leads to multi-beam propagation of radio waves and fluctuations of radar signals. Fluctuations of the radar

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M.B.Chowdary. "FM Transmission Using Single Bipolar Junction Transistor." J. of Advancement in Engineering and Technology 7, no. 1 (2018): 06. https://doi.org/10.5281/zenodo.1477196.

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The project comprises of single bipolar junction transistor (BJT) for carrying information via frequency modulation (FM) technique. The circuit is rather clever; it uses same transistor for three purposes they are, Amplification of baseband signal, Acts as an oscillator and to develop the RF voltage at the emitter terminal (that is the input signal which is amplified at the collector).

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Wolff, A. M., D. M. Akos, and S. Lo. "Potential radio frequency interference with the GPS L5 band for radio occultation measurements." Atmospheric Measurement Techniques Discussions 7, no. 5 (2014): 4529–50. http://dx.doi.org/10.5194/amtd-7-4529-2014.

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Abstract. New Radio Occultation (RO) receivers are planned to utilize the newly implemented Global Positioning System (GPS) L5 signal centered at 1176.45 MHz. Since there are currently no operational GPS L5 receivers used for space-based RO applications, the interference environment is unclear. Distance Measuring Equipment (DME) and Tactical Air Navigation (TACAN) stations share the same frequency band as the GPS L5 signal. DME/TACAN signals have been identified to be a means of interference for any GPS L5 receiver. This study focuses on implementing a Systems Tools Kit (STK) simulation to gai

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Yan, Hou. "Theoretical Model of Signal Transmission Based on Digital Radio Receiver." Open Electrical & Electronic Engineering Journal 8, no. 1 (2014): 705–8. http://dx.doi.org/10.2174/1874129001408010705.

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Radio receiver, as an extensively feasible modern technology, has been widely applied in all fields of military and civil. It is mainly to demodulate all kinds of required signals with strong interference and noise. Based on intermediate frequency (IF) software radio receiver test platform, the data transmission approach combining direct memory access (DMA) and multichannel buffered serial port (McBSP) was studied and the parallel operation of data transmission and data processing was realized. The method proposed for signal transmission and processing shows strong universality and can be used

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Egorov, V. V., and D. M. Klionskiy. "OFDM Signal Processing and Analysis in the Presence of Noise Using Wavelet Transform for Temporal Synchronization." Journal of the Russian Universities. Radioelectronics 28, no. 1 (2025): 65–76. https://doi.org/10.32603/1993-8985-2025-28-1-65-76.

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Introduction. Temporal synchronization is a relevant issue for various radio communication, radio navigation, and radar systems, for determination of time points for impulse signal arrival and positioning. The radio communication problem should ensure an error-free signal transmission via a radio channel at a maximum possible transmission rate. The known solutions of the temporal synchronization problem in the case of orthogonal frequency-division multiplexing (OFDM) signal transmission employ a guard interval for computing the periodic autocorrelation function of the analyzed OFDM-signal, whi

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Klapashchuk, Ihor, and Andrii Veryha. "Analysis of Amateur Radio Frequency Code Modulation Protocols for Transmitting Short Messages." Security of Infocommunication Systems and Internet of Things 2, no. 2 (2024): 02005. https://doi.org/10.31861/sisiot2024.2.02005.

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The article is dedicated to analyzing common short message transmission protocols in digital code used by radio amateurs in amateur radio communication. The following protocols are considered: RTTY, AMTOR, PACTOR1, ISCAT, JT4, JT9, JT65, FT4, and FT8. All of them use frequency shift keying (FSK), which provides significantly better noise resistance since information is encoded in frequency changes rather than amplitude. Because of this, FM is widely used in broadcasting. The primary purpose of the listed protocols is to prevent signal fading due to radio wave reflection from the ionospheric la

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Alencar, Thonimar V. "Arduino-based investigation of transmission lines and impedance matching." Physics Education 59, no. 5 (2024): 055018. http://dx.doi.org/10.1088/1361-6552/ad6ac8.

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Abstract Transmission lines play a crucial role in radio-frequency energy transmission between source and load. These systems connect essential physical phenomena like the formation of standing waves and the attenuation of electromagnetic waves in material media with practical considerations such as impedance matching and signal integrity. Understanding these systems requires knowledge of fundamental concepts like inductance, capacitance, and impedance. The absence of impedance matching between the line and load leads to a modulated amplitude in the resulting signal owing to interference betwe

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Zhang, Xinyan, Kunpeng Zhai, Sha Zhu, Huashun Wen, Yu Liu, and Ninghua Zhu. "Photonic Generation of Arbitrary Microwave Waveforms with Anti-Dispersion Transmission Capability." Micromachines 15, no. 10 (2024): 1214. http://dx.doi.org/10.3390/mi15101214.

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We propose and demonstrate a photonic-assisted approach for generating arbitrary microwave waveforms based on a dual-polarization dual-parallel Mach–Zehnder modulator, offering significant advantages in terms of tunability of repetition rates and anti-dispersion capability. In order to generate diverse microwave waveforms, two sinusoidal radio frequency signals with distinct frequency relationships are applied to the dual-polarization dual-parallel Mach–Zehnder modulator. By adjusting the power of the applied sinusoidal radio frequency signal, the power ratio between these orthogonal polarized

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Andreiev, O. V., O. F. Dubyna, T. M. Nikitchuk, and V. V. Tsyporenko. "Using Walsh Functions for Increase the Stealth Communication in a Digital Radio Channel." Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 85 (June 30, 2021): 27–32. https://doi.org/10.20535/radap.2021.85.27-32.

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Introduction. The use of wideband signals in telecommunication systems provides the desired speed of digital data transmission on radio channels of ultrahigh frequencies range with the required quality. In this case, in the range of ultrahigh frequencies, it is possible to provide a sufficiently low probability of detecting wideband signals, which corresponds to the needs of cybersecurity and data confidentiality.Due to the optimal processing in wideband receivers, the power of the useful signal can be increased by of the signal base. A decrease in the spectral power density of a wideband sign

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Paramonov, A. A., and Van Zung Hoang. "Joint use of frequency-time division and antinoise coding in radio communication systems with FHSS." Russian Technological Journal 9, no. 4 (2021): 77–84. http://dx.doi.org/10.32362/2500-316x-2021-9-4-77-84.

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In the context of continuous improvement of radio prospecting and active radio jamming technics along with introduction of automated active countermeasures systems (ACS), the frequency-hopping spread spectrum (FHSS) radio communication systems (RCS) are widely used in order to improve reliability and noise immunity of data transmission. The noise immunity of the RCS affected by unintentional or deliberate interference can be significantly perfected by the combined use of frequency-time division and antinoise coding. This paper explores the case when the interference created by an ACS system wi

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Korchynskyi, V. V., V. I. Kildishev, A. M. Berdnikov, and K. O. Smazhenko. "INCREASE OF STEALTH TRANSMISSION BASED ON TIMER SIGNALS AND LINEAR FREQUENCY MODULATION." Proceedings of the O.S. Popov ОNAT 1, no. 1 (2020): 53–58. http://dx.doi.org/10.33243/2518-7139-2020-1-1-53-58.

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Recently, much attention has been paid to the research of the properties and methods of forming complex noise-like signals to increase the noise immunity of radio communication systems operating in the conditions of electronic conflict. Using such signals, the tasks are resolved to improve the noise immunity and the main indicators of transmission stealth (energy, structural and information). For the task of the synthesis noise-like signals using timer signal designs in combination with the method of spreading the spectrum based on linear frequency modulation is proposed. The advisability of u

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Bukhala, Z. A., M. T. Glinkowski, J. K. Nelson, and V. J. Forte. "Radio frequency signal transmission on medium voltage power distribution lines." IEEE Transactions on Power Delivery 14, no. 1 (1999): 46–51. http://dx.doi.org/10.1109/61.736679.

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Guo, Tao, Zhenzhu Xi, Wei Liu, and Qingbin Liu. "Radio-magnetotelluric transmitter in full-bridge resonance inverter." Journal of Physics: Conference Series 2895, no. 1 (2024): 012031. https://doi.org/10.1088/1742-6596/2895/1/012031.

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Abstract Radio-magnetotelluric (RMT) is a widely used method for shallow subsurface electromagnetic exploration, employing magnetic sources (coils) for signal transmission. A common challenge is the low frequency and unstable current of the instrumentation. To address this, a full-bridge resonant inverter circuit is designed for signal transmission.

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Tian, Qing, Yufeng Shao, Anrong Wang, et al. "A RoF-FSO communication system using 10Gbit/s polsk 4-PAM downstream signals." ITM Web of Conferences 45 (2022): 02004. http://dx.doi.org/10.1051/itmconf/20224502004.

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In this paper, the performance of a 60 GHz radio over fiber free space optics (RoF-FSO) communication system with 10Gbit/s 4-ary pulse amplitude modulation (4-PAM) polarization shift-keying (Polsk) downlink signal is proposed and designed. In the receiver, the 60GHz millimeter-wave with 4-PAM downstream signals is generated by the beating of two continuous light waves, and the high frequency signal is demodulated by self-mixing zero difference detection method. Meanwhile, the optical spectra, radio frequency (RF) spectrum, eye-diagram are measured, and the transmission performance of the used

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Okorochkov, Alexander, and Nadezda Dmitrienko. "Influence of the radio signals frequency band on their spatial selection in communication channels." E3S Web of Conferences 279 (2021): 02002. http://dx.doi.org/10.1051/e3sconf/202127902002.

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This article deals with the dependence of the signal-to-noise ratio (S/N) on the frequency band of a radio channel when transmitting three different radio signals over it based on a mathematical model. Signals are transmitted on a single carrier frequency, in one direction and occupy the entire channel frequency band, which varied from 0 to 30 GHz. A threeelement sparse antenna array (SAA) is used for signal transmission. Each signal is emitted by all three SAA elements with certain phase shifts. In the reception area, such a structure of the total field is formed, at which the maxima of all t

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Serhiienko, S. P., V. G. Krizhanovski, D. V. Chernov, and L. V. Zagoruiko. "The use of non-steady state noise interferences to counteract passive eavesdropping devices." Radiotekhnika, no. 207 (December 24, 2021): 132–38. http://dx.doi.org/10.30837/rt.2021.4.207.14.

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The use of noise interference has become a common practice for information security. Recently appeared publications showing a potential possibility to use the noise radio frequency interference for information skimming by passive radio eavesdropping device. In particular, the vulnerability of the premises protected from eavesdropping devices is increased, if the radio frequency noising is switched on when confidential negotiations are being conducted. The use of radio noise waves energy for eavesdropping makes such devices invisible to nonlinear locators for listening devices if they activated

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Randy Rahmanto, Belinda Ayuningtyas, and Sulistyo Widodo. "Analisa Sinyal Remote Control Untuk Aplikasi Pengendali Jarak Jauh." Uranus : Jurnal Ilmiah Teknik Elektro, Sains dan Informatika 3, no. 1 (2025): 70–79. https://doi.org/10.61132/uranus.v3i1.659.

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Indonesia's aerospace sector plays a crucial role in maintaining national sovereignty. However, the country's airspace is often infiltrated by irresponsible parties, necessitating an effective monitoring system. Unmanned radio-controlled helicopters are a potential solution, although they are limited in range. This study aims to design a long-range control system for radio-controlled helicopters using satellite phone communication, which offers wide coverage and can reach remote areas. The system comprises a remote control, a radio converter circuit, an audio mixer, and a satellite phone. The

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Gelozhe, Yuri, Pavel Klimenko, and Aleksander Maksimov. "Formation the radio signal for the system of space-time signal processing." ITM Web of Conferences 30 (2019): 03011. http://dx.doi.org/10.1051/itmconf/20193003011.

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The work is devoted to digital information transmission systems using space-time signal processing. The formation of radio signals whose carrier frequencies are determined by the frequency-time matrices is considered. The signal shaper is based on a PLL system with a programmable frequency divider. The analysis of the processes in the phase automatic system under the influence of large destabilizing factors and frequency switching of the generated oscillations is carried out. It is theoretically and experimentally shown that in the above-mentioned conditions the automatic system may lose stabi

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Goryachkin O. V. and Maslov I. V. "Determination of statistical parameters of fluctuations in the refractive index of the ionosphere according to the data of the space-earth information transmission radio line." Technical Physics Letters 48, no. 11 (2022): 26. http://dx.doi.org/10.21883/tpl.2022.11.54884.19303.

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The study considers the problem of restoring the covariance function of fluctuations in the refractive index of the ionosphere based on the analysis of random changes in the frequency of the radio signal. To solve the problem, a trans-ionospheric signal of an information transmission radio line is used, radiated from a low-orbit spacecraft and received at a stationary receiving point. A method for estimating ionospheric parameters based on data from one typical communication session is described. To conduct a full-scale experiment, the signal emitted by the P-band radio transmitter of the on-b

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Al-Qadi, Osama, Bertus Tazifua, and Evgeniy Semenov. "Analysis of Discrete Message Transmission in Orthogonal Frequency Division Multiplexing Systems." NBI Technologies, no. 4 (2022): 5–9. http://dx.doi.org/10.15688/nbit.jvolsu.2022.4.1.

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High data transfer rates are required in modern digital radio transmission systems. But an increase in the data transfer rate leads to a deterioration in the transmission quality and a high BER (bit error rate). OFDM technology, which was introduced in the 1960s, implements all these functions. In this paper, the influence of fading channels on the transmission of information in OFDM systems is investigated. In wireless systems for transmitting discrete messages, the channel parameters greatly affect the transmission quality, as interference, noise and fading affect the useful signal. Fading i

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Kim, Sun Jun, Byeongho Park, Seung Hyo Noh, et al. "Carrier scattering in quasi-free standing graphene on hexagonal boron nitride." Nanoscale 9, no. 41 (2017): 15934–44. http://dx.doi.org/10.1039/c7nr04571a.

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Lukin A.F., Tomilin A. K., Gulkov A.N., and Krems K. A. "Radio communication channel characteristics estimation in the marine environment." Technical Physics 92, no. 9 (2022): 1232. http://dx.doi.org/10.21883/tp.2022.09.54688.43-22.

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The results of data processing obtained in the course of full-scale experiments on the transmission of a short-wave radio signal in the marine environment using special ball antennas are presented. The capacity of the radio communication channel in the modulation frequency band is estimated. Statistical estimates of signals and noises are obtained, which make it possible to calculate decision-making thresholds based on the theory of statistical radio engineering. It is concluded that it is possible to create a two-way voice radio communication channel between mobile underwater objects. Keyword

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Сенаторов, Л. А. "METHODS OF DATA TRANSMISSION USING LINEAR FREQUENCY MODULATED SIGNALS." ВЕСТНИК ВОРОНЕЖСКОГО ГОСУДАРСТВЕННОГО ТЕХНИЧЕСКОГО УНИВЕРСИТЕТА 20, no. 2 (2024): 72–79. http://dx.doi.org/10.36622/1729-6501.2024.20.2.012.

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исследуются различные подходы к передаче данных с использованием линейно-частотно-модулированных (ЛЧМ) сигналов. Целью работы является исследование способов модуляции и демодуляции ЛЧМ сигналов для выбора наиболее подходящего для случая передачи данных по радиоканалу. Исследованы два основных подхода − передача отдельных битов и передача групп бит для дополнительного расширения спектра. При рассмотрении этих подходов в работе исследуются четыре способа передачи данных с использованием ЛЧМ сигналов: обработка при помощи согласованных фильтров, обработка посредством корреляционного метода, обраб

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Afanasiev, Nikolay, and Stanislav Chudaev. "DIAGNOSTICS OF THE STOCHASTIC IONOSPHERIC CHANNEL IN THE DECAMETER BAND OF RADIO WAVES." Solar-Terrestrial Physics 6, no. 4 (2020): 66–73. http://dx.doi.org/10.12737/stp-64202010.

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We propose a method for direct diagnostics of a stochastic ionospheric radio channel. This method can recalculate probe signal characteristics into transmitted signal characteristics. We derive analytical equations of second-order statistical moments for trajectory characteristics of the main and probe signals propagating in a three-dimensional randomly inhomogeneous ionosphere. We take into account boundary conditions at signal transmission and reception points. As a model of random irregularities of permittivity of the ionosphere, we utilize the concept of a changing space-time correlation e

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Ohtsuki, Tatsuya, Takamitsu Aiba, and Motoharu Matsuura. "Simultaneous Radio-Frequency and Baseband Signal Transmission Over a Multimode Fiber." IEEE Photonics Journal 11, no. 6 (2019): 1–12. http://dx.doi.org/10.1109/jphot.2019.2957066.

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Pishchin, Oleg Nickolaevich, and Kseniya Pavlovna Voronina. "Studying effectiveness of channel jamming protection in aeronautical radio communications." Vestnik of Astrakhan State Technical University. Series: Management, computer science and informatics 2022, no. 4 (2022): 48–53. http://dx.doi.org/10.24143/2073-5529-2022-4-48-53.

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When performing aviation flights the high-quality and reliable communication with the control room becomes important for ensuring the crew safety. The purpose of the study is to investigate the quality of aviation radio communication in different methods of information transmission for developing the technical solutions of radio communication perfection. The equipment used today is designed for instant selection of preset channels and data exchange at fixed operating frequencies of ground control points with aircraft radio equipment in the meter and decimeter ranges. The most important require

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Zhang, Qi, Zihan Cheng, Haodong Liang, Jing Yuan, Anhua Dong, and Deshuang Zhao. "High-Precision Localization of Passive Intermodulation Source in Radio Frequency Transmission Lines Based on Dual-Frequency Signals." Electronics 13, no. 5 (2024): 928. http://dx.doi.org/10.3390/electronics13050928.

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With the development of communication technology, the interference from passive intermodulation to the communication system has become increasingly severe. Locating the source of passive intermodulation and then repairing or replacing the device experiencing passive intermodulation is a reliable method. Therefore, this paper proposes a dual-frequency signal localization method based on the principle of phase ranging to accurately locate the passive intermodulation sources in RF cables. This method switches the test signal frequency to obtain the phase of passive intermodulation signals at diff

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Kurbatska, Inna, Armands Ostrovskis, Laura Skladova, Kristaps Rubuls, Sandis Spolitis, and Vjaceslavs Bobrovs. "Power limits with adjustable 10G receiver parameters for A-RoF transmission." Elektronika ir Elektrotechnika 29, no. 3 (2023): 62–67. http://dx.doi.org/10.5755/j02.eie.33862.

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Current paper characterizes the performance of the three-radio-frequency-channels, orthogonal-frequency-division-multiplexed (OFDM) radio-over-fiber (RoF) transmission system in terms of error-vector-magnitude and received optical signal power for a typical 10 GHz receiver obtained by the comprehensive simulations. The impact of the transmitted OFDM channels' signal-to-noise ratio (SNR) is also considered. We demonstrate that the SNR decrease from 40 dB to 25 dB results in an error vector magnitude (EVM) increase of up to 4 %. Furthermore, we propose the approach for allowing adjusting these r

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Wang, Qixing, Peng Gao, Zhuochen Xie, and Jinpei Yu. "Design of an Integrated System for Spaceborne SAR Imaging and Data Transmission." Sensors 24, no. 19 (2024): 6375. http://dx.doi.org/10.3390/s24196375.

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In response to the conflicting demands between real-time satellite communication and high-resolution synthetic aperture radar (SAR) imaging, we propose a method that aligns the data transmission rate with the imaging data volume. This approach balances SAR performance with the requirements for real-time data transmission. To meet the need for mobile user terminals to access real-time SAR imagery data of their surroundings without depending on large traditional ground data transmission stations, we developed an application system based on filter bank multicarrier offset quadrature amplitude mod

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Zhou, Hui, Yunlong Shen, Ming Chen, Jun Cheng, and Yuting Zeng. "A ROF Access Network for Simultaneous Generation and Transmission Multiband Signals Based on Frequency Octupling and FWM Techniques." Advances in Condensed Matter Physics 2018 (September 2, 2018): 1–9. http://dx.doi.org/10.1155/2018/9409583.

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We report a radio-over-fiber (ROF) access network with multiple high-repetive frequency mm-wave signals generation utilizing a dual-parallel Mach-Zehnder modulator (DP-MZM) and an semiconductor optical amplifier (SOA) for multiple base stations (BSs). In the scheme, at the central station (CS), signal and pump with frequency interval of 8fRF are generated by properly adjusting the parameters of the DP-MZM. After FWM in a SOA, new converted optical signals are obtained. Two tones of the optical signals are selected by using tunable optical filter (TOF), which are then sent into a photodiode (PD

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Senol, Nurettin Selcuk, Amar Rasheed, Mohamed Baza, and Maazen Alsabaan. "Identifying Tampered Radio-Frequency Transmissions in LoRa Networks Using Machine Learning." Sensors 24, no. 20 (2024): 6611. http://dx.doi.org/10.3390/s24206611.

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Long-range networks, renowned for their long-range, low-power communication capabilities, form the backbone of many Internet of Things systems, enabling efficient and reliable data transmission. However, detecting tampered frequency signals poses a considerable challenge due to the vulnerability of LoRa devices to radio-frequency interference and signal manipulation, which can undermine both data integrity and security. This paper presents an innovative method for identifying tampered radio frequency transmissions by employing five sophisticated anomaly detection algorithms—Local Outlier Facto

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Volkov, A. A., and M. S. Morozov. "METHOD FOR IMPROVING SELECTIVITY OF SIGNALS IN RADIO COMMUNICATION." World of Transport and Transportation 14, no. 2 (2016): 56–63. http://dx.doi.org/10.30932/1992-3252-2016-14-2-6.

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[For the English abstract and full text of the article please see the attached PDF-File (English version follows Russian version)].ABSTRACT Taking into account the characteristics of railway radio communication a precision wideband phase shifter to 90° for an intermediate frequency signal is offered. A phase preselector of a receiver, combined with its frequency converter, is developed, allowing to further increase selectivity of adjacent and image channels, as well as sensitivity of a receiver while simplifying its structure. The results of calculations of structural elements and transmission

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Aminudin, Nur Auni Izzati, Noor Hidayah Mohd Yunus, Hafiz Basarudin, et al. "Analysis of Rainfall Distribution in Malaysia through the Employment of Hydro-Estimator Data." Engineering, Technology & Applied Science Research 14, no. 5 (2024): 16680–85. http://dx.doi.org/10.48084/etasr.7601.

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Rain rate influenced by atmospheric factors is related to rainfall patterns affected by climate change. Attenuation and signal losses due to rain are crucial constraints in communication systems such as 5G, microwave radio links and communication satellite systems. These communication systems have deteriorated from signal fading and distortion when exposed to rain. Signal fading by hydrometeor particles in the atmosphere may occur during wireless signal transmissions at frequencies higher than 10 GHz. In this paper, Hydro-Estimator data for Peninsular Malaysia, Sabah and Sarawak from the years

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Stojanović, Nenad, Branislav Todorović, and Vladimir Ristić. "Analysis of repeater jamming of a slow frequency hopping radio." Vojnotehnicki glasnik 70, no. 3 (2022): 664–79. http://dx.doi.org/10.5937/vojtehg70-37535.

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Introduction/purpose: The article presents a model of a slow frequency hopping radio in the case of repeater jamming. The aim is to analyze the effectiveness of repeater jamming to a military tactical slow frequency hopping radio. Methods: It is assumed that the repeater jammer will be successful in detecting signals with slow frequency hopping at each hop and that it will perform successful partial jamming of the intercepted communication. Under partial jamming, it is considered that a certain part of the transmission time of each hop will be jammed. A theoretical analysis of the impact of a

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