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Journal articles on the topic 'RF communication system'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

D. Ponnimbaduge Perera, Tharindu, Akashkumar Rajaram, Sangay Chedup, Dushantha Nalin K. Jayakody, and Bin Chen. "Hybrid RF/visible light communication in downlink wireless system." International Journal of Engineering & Technology 7, no. 2.28 (May 16, 2018): 272. http://dx.doi.org/10.14419/ijet.v7i2.28.12943.

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The spectrum crunch in Radio Frequency (RF) Communication and the prospect of Visible Light Communication (VLC) as an alternative to RF has made way for high speed VLC deployment. The ubiquitous coverage of RF and the high speed data rate achieved with VLC, make the two technologies complimentary to each other, making the hybrid RF/VLC an emerging trend in wireless networks. This study presents a downlink communication of a hybrid RF-VLC, where the signal received through RF channel by a relay is decoded and the symbols are converted into an electrical signals. The electrical signal is fed to an array of LEDs in the relay where data is transmitted in rays of light from LEDs. The hybrid RFVLC system performance is compared with a conventional RF system to understand the performance difference between the two communication models. Thus, the performance of both system models are analysed in terms of Symbol Error Rate and Outage Probability. Numerical results show that the proposed hybrid RF-VLC system is superior to conventional lone RF cooperative system.

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2

Jin, Hyun-Soo. "Implementation of Radio Frequency Communication System based Serial UART Communication." Journal of Digital Convergence 12, no. 12 (December 28, 2014): 257–64. http://dx.doi.org/10.14400/jdc.2014.12.12.257.

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3

Narayanan, Ram, Kyle Gallagher, Gregory Mazzaro, Anthony Martone, and Kelly Sherbondy. "Hardware Design of a High Dynamic Range Radio Frequency (RF) Harmonic Measurement System." Instruments 2, no. 3 (August 19, 2018): 16. http://dx.doi.org/10.3390/instruments2030016.

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Radio frequency (RF) circuit elements that are traditionally considered to be linear frequently exhibit nonlinear properties that affect the intended operation of many other RF systems. Devices such as RF connectors, antennas, attenuators, resistors, and dissimilar metal junctions generate nonlinear distortion that degrades primary RF system performance. The communications industry is greatly affected by these unintended and unexpected nonlinear distortions. The high transmit power and tight channel spacing of the communication channel makes communications very susceptible to nonlinear distortion. To minimize nonlinear distortion in RF systems, specialized circuits are required to measure the low level nonlinear distortions created from traditionally linear devices, i.e., connectors, cables, antennas, etc. Measuring the low-level nonlinear distortion is a difficult problem. The measurement system requires the use of high power probe signals and the capability to measure very weak nonlinear distortions. Measuring the weak nonlinear distortion becomes increasingly difficult in the presence of higher power probe signals, as the high power probe signal generates distortion products in the measurement system. This paper describes a circuit design architecture that achieves 175 dB of dynamic range which can be used to measure low level harmonic distortion from various passive RF circuit elements.

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HALUŠKA, Renát, and Ľuboš OVSENÍK. "EXAMPLE OF SWITCHING HYBRID FSO/RF SYSTEMS." Acta Electrotechnica et Informatica 20, no. 4 (January 21, 2021): 27–31. http://dx.doi.org/10.15546/aeei-2020-0022.

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

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Márton, Michal, Ľuboš Ovseník, Ján Turán, Michal Špes, and Jakub Urbanský. "Design of Helix Antenna for 9.2GHz in FEKO for FSO/RF Hybrid System Focused on Height of Helix." Carpathian Journal of Electronic and Computer Engineering 11, no. 2 (December 1, 2018): 3–7. http://dx.doi.org/10.2478/cjece-2018-0010.

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Abstract Nowadays we are living in the ages of expansion of communication. The young generation depends on the online communications with other. Each of the devices is purposed to communication. Cloud data storage systems are available only with stable connection. Requirements are growing up to date. The answer on these requirements: the high speed of transmission, high level of security and wide bandwidth are optical communication systems. This system offers comparable features as optical system with physical optical fibers. But it has one big drawback. It is sensitivity to weather changes. We have to make backup link for case of outages. One part of design FSO/RF system in our case contains selection of appropriate type of RF antenna. We are looking for appropriate candidate. This paper is focused on analysis of helix antenna operating in non-licensed frequency range on 9.2GHz. The point of this paper is the examination of the impact of the height of helix designed antenna.

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6

surekha, T. P. "C-Band VSAT Data Communication System and RF Impairments." International Journal of Distributed and Parallel systems 3, no. 3 (May 31, 2012): 339–55. http://dx.doi.org/10.5121/ijdps.2012.3328.

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7

Monish, P., R. Darshan, K. Ponvalavan, and Dr M. Bharathi. "Drowning Alert System using RF Communication and GPRS/GSM." Journal of Physics: Conference Series 1997, no. 1 (August 1, 2021): 012044. http://dx.doi.org/10.1088/1742-6596/1997/1/012044.

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8

Jiang, Zhao, Liu, Deng, Luo, Wei, and Yang. "Performance Improvement for Mixed RF–FSO Communication System by Adopting Hybrid Subcarrier Intensity Modulation." Applied Sciences 9, no. 18 (September 6, 2019): 3724. http://dx.doi.org/10.3390/app9183724.

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The improvement for hybrid radio frequency–free space optical (RF–FSO) communication system in wireless optical communications has acquired growing interests in recent years, but rarely improvement is based on hybrid modulation. Therefore, we conduct a research on end-to-end mixed RF–FSO system with the hybrid pulse position modulation–binary phase shift keying–subcarrier intensity modulation (PPM–BPSK–SIM) scheme. The RF link obeys Rayleigh distribution and the FSO link experiences Gamma–Gamma distribution. The average bit error rate (BER) for various PPM–BPSK–SIM schemes has been derived with consideration of atmospheric turbulence influence and pointing error condition. The outage probability and the average channel capacity of the system are discussed as well. Simulation results indicate that the pointing error aggravates the influence of atmospheric turbulence on the channel capacity, and the RF–FSO systematic performance is improved obviously while adopting PPM–BPSK–SIM under strong turbulence and severe pointing error conditions, especially, when the system average symbol length is greater than eight.

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9

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

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Abstract Communication technologies are growing for day to day because demand on data sharing is unstoppable. Users require availability of approach to network at all time. Implementation of smart technologies allows communication of all type of devices. Capacity of data flow have to grow. Video formats HD or 4K require transmit on high data speed. Based on the demands many types of different communication systems which are suitable for these speeds were designed. One of these systems is FSO (Free Space Optics). FSO system is based on transmission of optical beams which carry the information. This system allow high data speed comparable with standard optical fiber in range to 10km. One of drawbacks of this system is LOS (Light of Sight) between communication points. The other drawback is sensitivity to weather changes. Optical beams interfere with water particles and cause attenuation on transmission path. The solution is in implementation using hybrid FSO/RF system which combines optical communication system with RF (Radio Frequency) backup link. We realized FSO communication link on Technical University of Košice. Our research is focused on design of appropriate type of antenna for our RF backup link. Our results in this area were published.

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10

Liu, Kai, Billy Ahn, Tom Strothmann, Yeong Lee, and Flynn Carson. "RF System-in-Packages: History and Trend." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2011, DPC (January 1, 2011): 001220–49. http://dx.doi.org/10.4071/2011dpc-keynote4_statschippac.

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In the last decade, people have seen tremendous increasing of data transmission speed and data storage capacity, which is mainly attributed to the Moore's law. However, this has little to do with RF devices and RF packages that are often used in the front-ends of wireless communication systems. Making components (e.g., width and spacing) smaller or closer does not necessarily help from RF perspectives, and as a result SoC (System on Chip) products for RF system do not really take off. The things that eventually make RF system evolution are from the concepts of System in Package, which may also include baseband chips and memory chips along with RF chips in a package. Substrate loss and metal loss are the key specifications to be considered for RF packaging. Several substrate technologies (e.g., laminate, LTCC, GaAs, glass, high-resistivity silicon, etc) that are typically used for RF packaging in the industry will be introduced. Some design challenges (e.g., impedance matching, minimizing coupling/cross-talk for high integration packages, etc) will be addressed. A trend for future RF packaging is drawn, based on successful examples of RF packaging in the industry.

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11

Amirabadi, Mohammad Ali, and Vahid Tabataba Vakili. "Performance of a relay-assisted hybrid FSO/RF communication system." Physical Communication 35 (August 2019): 100729. http://dx.doi.org/10.1016/j.phycom.2019.100729.

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12

Khan, M. N., M. Jamil, and M. Hussain. "Adaptation of Hybrid FSO/RF Communication System Using Puncturing Technique." Radioengineering 25, no. 4 (September 15, 2016): 644–51. http://dx.doi.org/10.13164/re.2016.0644.

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13

Ali Amirabadi, Mohammad, and Vahid Tabataba Vakili. "Performance analysis of a novel hybrid FSO/RF communication system." IET Optoelectronics 14, no. 2 (April 1, 2020): 66–74. http://dx.doi.org/10.1049/iet-opt.2018.5172.

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14

Wang, Wenxing, Guozheng Yan, and Guoqing Ding. "A miniature bidirectional RF communication system for micro gastrointestinal robots." Journal of Medical Engineering & Technology 27, no. 4 (January 1, 2003): 160–63. http://dx.doi.org/10.1080/0309190031000069991.

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15

Khan, Muhammad Nasir, Syed Omer Gilani, Mohsin Jamil, Abdul Rafay, Qasim Awais, Bilal A. Khawaja, Muhammad Uzair, and Abdul Waheed Malik. "Maximizing Throughput of Hybrid FSO-RF Communication System: An Algorithm." IEEE Access 6 (2018): 30039–48. http://dx.doi.org/10.1109/access.2018.2840535.

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16

Chen, Jiaxuan, Zhaocheng Wang, and Tianqi Mao. "Resource Management for Hybrid RF/VLC V2I Wireless Communication System." IEEE Communications Letters 24, no. 4 (April 2020): 868–71. http://dx.doi.org/10.1109/lcomm.2020.2969624.

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17

Amirabadi, Mohammad Ali, and Vahid Tabataba Vakili. "A novel hybrid FSO / RF communication system with receive diversity." Optik 184 (May 2019): 293–98. http://dx.doi.org/10.1016/j.ijleo.2019.03.037.

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18

Kumar, Deepak, Saikat Mondal, Yiming Deng, and Premjeet Chahal. "Wireless Battery-Free Harmonic Communication System for Pressure Sensing." Micromachines 11, no. 12 (November 27, 2020): 1043. http://dx.doi.org/10.3390/mi11121043.

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In this paper, an efficient passive wireless harmonic communication system is proposed for the real-time monitoring of the pressurized pipelines. A pressure sensor is fabricated using the additive manufacturing technique and a harmonic radio frequency (RF) tag is designed to operate at the fundamental frequency (fo) of 2 GHz that shifts the phase of the back reflected RF signal according to the applied pressure ranging from 0 to 20 psi. A power efficient phase modulation with virtually no losses is achieved using a hybrid coupler-based phase shifter that efficiently reflect back the incoming signal using an end coupled reactive impedance element/sensor. The phase delay introduced by the reactive element gets doubled with the second harmonic communication, which increases the sensitivity by a factor of two. The concept of harmonic backscattering is exploited to reduce the effects of multi-path interference and self jamming, as well as improving the signal-to-noise ratio (SNR).

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19

Haluška, Renát, Peter Šuľaj, Ľuboš Ovseník, Stanislav Marchevský, Ján Papaj, and Ľubomír Doboš. "Prediction of Received Optical Power for Switching Hybrid FSO/RF System." Electronics 9, no. 8 (August 6, 2020): 1261. http://dx.doi.org/10.3390/electronics9081261.

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This study deals with the problem of fiber-free optical communication systems—known as free space optics—using received signal strength identifier (RSSI) prediction analysis for hard switching of optical fiber-free link to base radio-frequency (RF) link and back. Adverse influences affecting the atmospheric transmission channel significantly impair optical communications, therefore attention was paid to the practical design, as well as to the implementation of the monitoring device that is used to record and process weather information along a transmission path. The article contains an analysis and methodology of the solution of the high availability of the optical link. Attention was paid to the technique of hard free space optics (FSO)/RF-switching with regard to the amount of received optical power detected and its relation to the quantities influencing the optical communication line. For this purpose, selected methods of machine learning were used, which serve to predict the received optical power. The process of analysis of prediction of received optical power is realized by regression models. The study presents the design of the optimal data input matrix model, which forms the basis for the training of the prediction models for estimating the received optical power.

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20

Tran, Huy Q., and Cheolkeun Ha. "Fingerprint-Based Indoor Positioning System Using Visible Light Communication—A Novel Method for Multipath Reflections." Electronics 8, no. 1 (January 6, 2019): 63. http://dx.doi.org/10.3390/electronics8010063.

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A highly accurate indoor positioning under the effect of multipath reflections has been a prominent challenge for recent research. This paper proposes a novel indoor visible light communication (VLC) positioning model by connecting k-nearest neighbors (kNN) and random forest (RF) algorithms for reflective environments, namely, kNN-RF. In this fingerprint-based model, we first adopt kNN as a powerful solution to expand the number of input features for RF. Next, the importance rate of these features is ranked and the least effective one(s) may be removed to reduce the computation effort. Next, the training process using the RF algorithm is conducted. Finally, the estimation process is utilized to discover the final estimated position. Our simulation results show that this new approach improved the positioning accuracy, making it nearly five times better than other popular kNN algorithms.

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21

Zhao, Jumin, Jianyi Zhou, Yuxuan Yao, Deng-ao Li, and Liye Gao. "RF-Motion: A Device-Free RF-Based Human Motion Recognition System." Wireless Communications and Mobile Computing 2021 (March 9, 2021): 1–9. http://dx.doi.org/10.1155/2021/1497503.

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In recent years, human motion recognition, as an important application of the intelligent perception of the Internet of Things, has received extensive attention. Many applications benefit from motion recognition, such as motion monitoring, elderly fall detection, and somatosensory games. Several existing RF-based motion recognition systems are susceptible to multipath effects in complex environments, resulting in lower recognition accuracy and difficulty in extending to other scenarios. To address this challenge, we propose RF-Motion, a device-free commercial off-the-shelf (COTS) RFID-based human motion recognition system that can detect human motion in complex multipath environments such as indoor environments. And when the environment changes, RF-Motion still has high recognition accuracy, even without retraining. In addition, we use data slicing to solve the problem of discontinuity in the time domain of RFID communication and then use the synthetic aperture (SAR) algorithm to obtain the fingerprint feature matrix corresponding to each motion. Finally, the dynamic time warping (DTW) algorithm is used to match the prior motion fingerprint database to complete the motion recognition. Experiments show that RF-Motion can achieve up to 90% accuracy for human motion recognition in an indoor environment, and when the environment changes, it can still reach a minimum accuracy of 87%.

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22

Barousis, Vlasis, Athanasios G. Kanatas, and George P. Efthymoglou. "A Complete MIMO System Built on a Single RF Communication Ends." PIERS Online 6, no. 6 (2010): 559–63. http://dx.doi.org/10.2529/piers091219100435.

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23

Dalwadi, Darshankumar C., and Niralee Bhatt. "Performance Evaluation of Face Recognition Based Attendance System using RF Communication." International Journal of Computer Sciences and Engineering 7, no. 5 (May 31, 2019): 124–28. http://dx.doi.org/10.26438/ijcse/v7i5.124128.

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24

Ai, Yun, Aashish Mathur, Hongjiang Lei, Michael Cheffena, and Imran Shafique Ansari. "Secrecy enhancement of RF backhaul system with parallel FSO communication link." Optics Communications 475 (November 2020): 126193. http://dx.doi.org/10.1016/j.optcom.2020.126193.

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25

Khan, Muhammad Nasir, Abdul Rafay, S. O. Gilani, and M. Jamil. "Link Adaptation for Maximizing MI of Hybrid Optical/RF Communication System." Procedia Computer Science 110 (2017): 282–89. http://dx.doi.org/10.1016/j.procs.2017.06.096.

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26

Illi, Elmehdi, Faissal El Bouanani, Daniel Benevides Da Costa, Fouad Ayoub, and Ugo Silva Dias. "Dual-Hop Mixed RF-UOW Communication System: A PHY Security Analysis." IEEE Access 6 (2018): 55345–60. http://dx.doi.org/10.1109/access.2018.2870344.

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27

Kashef, Mohamed, Mohamed Abdallah, and Naofal Al-Dhahir. "Transmit Power Optimization for a Hybrid PLC/VLC/RF Communication System." IEEE Transactions on Green Communications and Networking 2, no. 1 (March 2018): 234–45. http://dx.doi.org/10.1109/tgcn.2017.2774104.

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28

Li, Mi, Xinyu Zhang, Yifeng Hong, Yizhuo Zhang, Yuechun Shi, and Xiangfei Chen. "Confidentiality-enhanced chaotic optical communication system with variable RF amplifier gain." Optics Express 27, no. 18 (August 28, 2019): 25953. http://dx.doi.org/10.1364/oe.27.025953.

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29

László, Méhes. "The Development of a GPS Based RF Signal Strength Measurement System." Applied Mechanics and Materials 309 (February 2013): 294–301. http://dx.doi.org/10.4028/www.scientific.net/amm.309.294.

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Nowadays the wireless communication networks are the bigger part in the communication area. It is very important to choose the best place for the wireless nodes. To support the placement of these devices I wanted to create a signal strength measurement system that I implemented on ZigBee platform with GPS positioning.

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Hou, Xin, and Xing Feng Wei. "Design and Implementation of Monitoring System Based on MSP430." Advanced Materials Research 490-495 (March 2012): 1284–89. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.1284.

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This paper mainly introduces the wireless sensor network monitoring system composed of the nodes and the base station. The software and hardware of this system are analyzed and designed. The MSP430 MCU which is low power consumption is used as a controller chip; meanwhile RF communications chip RF2401L is selected by the monitoring system. This paper elaborates the architecture of the monitoring system, the responsive communication mode between nodes and the base station and the design of the software process.

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31

Kiedrowski, Piotr. "Toward More Efficient and More Secure Last Mile Smart Metering and Smart Lighting Communication Systems with the Use of PLC/RF Hybrid Technology." International Journal of Distributed Sensor Networks 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/675926.

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This paper describes the last mile communication system solutions realized in PLC/RF hybrid technology, which is dedicated to Smart Grid communication subsystems, mainly for Smart Metering and Smart Lighting applications. The use of hybrid technology makes the system more efficient and more secure (still being of low cost, in terms of both implementation and operation). This paper proposes a novel parameter, PDR, to describe the performance of the communications in the last mile network. The communications are realized with the use of the narrowband power line communications technique, the low power wireless communications technique, and the combination of them. The cost analysis for the proposed solution is also done. Theoretical considerations, contained in the paper, are the result of the author’s experience in the design, implementation, and operation of the last mile Smart Grid communication systems, realized in the narrowband PLC or 433/868 MHz radio technology. These communication systems were developed for data acquisition and distribution between specific terminals, which are Smart Meters or Smart Lanterns. The aim of this paper is to outline superiorities of the hybrid technology, from which the most important is a low layer protection of the sensitive critical infrastructure, which undoubtedly is a last mile Smart Grid communication network.

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32

Liu, Wen Kai, Peng Wang, and Jian Cui. "Research and Design of a Large Bandwidth Receiver RF Front-End." Advanced Materials Research 926-930 (May 2014): 2503–7. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.2503.

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RF front-end is an important part of the communication system. It realizes the functions such as low noise amplifier application, filtering and mixing, completes the conversion between the IF signal and the RF signal, and ensures effective communication system flexibility and versatility. In the paper, according to the superheterodyne structure, a receiver RF front-end has been designed. The total gain of the link circuit is more than 100 dB, with 50 dB AGC range, the center frequency is 750 MHz with 100MHz bandwidth, local oscillator (LO) signal with frequency 935MHz is generated by PLL and the stability is-82dBc/Hz@1KHz.

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Sarma, Manash Pratim, Kandarpa Kumar Sarma, and Nikos E. Mastorakis. "RF Energy Harvesting in Cognitive Radio: Towards Green Communication." MATEC Web of Conferences 210 (2018): 03015. http://dx.doi.org/10.1051/matecconf/201821003015.

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There has been a continuous emphasis on an energy efficient communication system design. With the advent of 5G communication technologies, along with a faster and reliable data transfer mechanisms, energy management and conservation is gaining more attention and is becoming a major and indispensable part of communication research. This papers highlights the contemporary technological developments in the field of RF energy harvesting in a cognitive and high data rate network. It has been observed that an efficient RF energy harvesting technology in a cognitive platform definitely leads towards a greener communication paradigm.

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Wang, Da Hu, Qie Qie Zhang, and Yi Fan Sun. "Design of Wireless Voice Communication System in Underground Coal Mine Based on ZigBee." Applied Mechanics and Materials 548-549 (April 2014): 1402–6. http://dx.doi.org/10.4028/www.scientific.net/amm.548-549.1402.

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For disadvantages of the present mine voice communication systems, a kind of wireless voice communication system based on Zig Bee is put forward. The paper provides detailed informations about hardware and software of the wireless voice communication device. In the system, adopt CC2530 as RF sending-receiving unit of voice communication node, convert speech signals to digital or analog signals by CSP1027, encode or decode quantized voice data by AMBE voice codec technology and realize voice message two-way wireless communication over the Zig Bee wireless communication protocol IEEE 802.15.4 between voice communication devices. Experiments have shown that voice communication device can get a clear voice and have a high reliability in the effective distance of communication, meet the requirements of voice communication.

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35

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

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

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Yuan, Xiao Yan, Hong Fang, Xin Zhou, and Guo Chu Shou. "Designing Multisine Excitations for Measurement of Modern Wireless Communication System." Applied Mechanics and Materials 103 (September 2011): 25–29. http://dx.doi.org/10.4028/www.scientific.net/amm.103.25.

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Multisine signal is often employed as an appropriate excitation to represent the complex modulated RF signals for accurate measurement of modern wireless communication system. This paper presents a novel way of designing a multisine signal by using Discrete Fourier Transformation coefficients to represent the digital modulation signals. Investigations of the approach on the IS-95 reverse-link signal as original signal is demonstrated the designed multisine signal can approximate represent original signal.

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Nguyen, Huy, Vanhoa Nguyen, Conghoan Nguyen, Van Bui, and Yeongmin Jang. "Design and Implementation of 2D MIMO-Based Optical Camera Communication Using a Light-Emitting Diode Array for Long-Range Monitoring System." Sensors 21, no. 9 (April 26, 2021): 3023. http://dx.doi.org/10.3390/s21093023.

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Wireless technologies that use radio frequency (RF) waveforms are common in wireless communication systems, such as the mobile communication, satellite system, and Internet of Things (IoT) systems. It is more advantageous than wired communication because of the ease of installation. However, it can negatively impact human health if high frequencies are used to transmit data. Therefore, researchers are exploring the potential of optical wireless communication as an alternative, which uses the visible light bandwidth instead of RF waveforms. Three possibilities are being investigated: visible light communication, light fidelity, and optical camera communication. In this paper, we propose a multiple-input multiple-output modulation scheme using a light-emitting diode (LED) array, which is applicable to the IoT system, based on on–off keying modulation in the time domain. This scheme is compatible with the two popular types of camera in the market, rolling shutter cameras and global shutter cameras, as well as the closed-circuit television camera, which is used in factories, buildings, etc. Despite the small size of the LED array, implementing this scheme with 10 links in different positions at a communication distance of 20 m is possible for efficient performance (low error rate) by controlling the exposure time, shutter speed, focal length, channel coding and applying the matched filter.

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Antara, Adi Surya, N. Gunantara, and NMAED Wirastuti. "Metode RF Filter untuk Perbaikan Kinerja Received Total Wideband Power pada Sistem UMTS." Majalah Ilmiah Teknologi Elektro 15, no. 1 (June 25, 2016): 61. http://dx.doi.org/10.24843/mite.2016.v15i01p11.

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Cellular communication system with multiple network operators operate on a co-located area (heterogeneus network) causing effect of radio frequency interference. RTWP (received total wideband power) value emerges as indicator radio frequency interference on UMTS system, which is primary contribution of degraded QoS cellular communication system. RF filter butterworth circuit two half section resulted as optimal design to reach the goal compare to the other circuit section. By implemented RF filter has showed improvement indicator perform RTWP on UMTS network operator. DOI: 10.24843/MITE.1501.11

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Gueye, Ibrahima, Ibra Dioum, Idy Diop, K. Wane Keita, Papis Ndiaye, Moussa Diallo, and Sidi Mohamed Farssi. "Performance of Hybrid RF/FSO Cooperative Systems Based on Quasicyclic LDPC Codes and Space-Coupled LDPC Codes." Wireless Communications and Mobile Computing 2020 (December 30, 2020): 1–15. http://dx.doi.org/10.1155/2020/8814588.

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Free space optical (FSO) communication systems provide wireless line of sight connectivity in the unlicensed spectrum, and wireless optical communication achieves higher data rates compared to their radio frequency (RF) counterparts. FSO systems are particularly attractive for last mile access problem by bridging fiber optic backbone connectivity to RF access networks. To cope with this practical deployment scenario, there has been increasing attention to the so-called dual-hop (RF/FSO) systems where RF transmission is used at a hop followed by FSO transmission to another. In this article, we study the performance of cooperative transmission systems using a mixed RF-FSO DF (decode and forward) relay using error-correcting codes including QC-LDPC codes at the relay level. The FSO link is modeled by the gamma-gamma distribution, and the RF link is modeled by the Additive White Gaussian Noise (AWGN) model. Another innovation in this article is the use of cooperative systems using a mixed FSO/RF DF relay using quasicyclic low-density parity check (QC-LDPC) codes at the relay level. We also use the space-coupled low-density parity check (SC-LDPC) codes on the same scheme to show its importance in cooperative optical transmission but also in hybrid RF/FSO transmission. The latter will be compared with QC-LDPC codes. The use of mixed RF/FSO cooperative transmission systems can improve the reliability and transmission of information in networks. The results demonstrate an improvement in the performance of the cooperative RF/FSO DF system based on QC-LDPC and SC-LDPC codes compared to RF/FSO systems without the use of codes, but also to the DF systems proposed in the existing literature.

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Hu, Zheng Qun, Guo Xiang Ai, Li Rong Zhang, and Chao Hu. "A Control System in Satellite Navigation and Communication Terminal." Applied Mechanics and Materials 513-517 (February 2014): 2888–92. http://dx.doi.org/10.4028/www.scientific.net/amm.513-517.2888.

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For the needs of a satellite navigation and communication system, we design and implement a terminal control system in the integration of navigation and communication system in this paper. The control system consists of CPU controller, GPS positioning module, smart finding and alignment satellite module, transmit/receive baseband, RF module, voice module and other functional modules, which has navigation and communication function. Satellite communication includes voice communication and data communication. The voice communication interface is operated conveniently, which using I/Q quadrature BPSK modulation to set up satellite links easily. It has a good communication quality. Data communication using the bidirectional answer mode to make success rate close to 100% in data upward to the communication center station, which is well to meet the needs in data upward.

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Rehman, Muhammad Riaz Ur, Imran Ali, Danial Khan, Muhammad Asif, Pervesh Kumar, Seong Jin Oh, Young Gun Pu, et al. "A Design of Adaptive Control and Communication Protocol for SWIPT System in 180 nm CMOS Process for Sensor Applications." Sensors 21, no. 3 (January 27, 2021): 848. http://dx.doi.org/10.3390/s21030848.

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This paper presents an adaptive control and communication protocol (ACCP) for the ultra-low power simultaneous wireless information and power transfer (SWIPT) system for sensor applications. The SWIPT system-related operations depend on harvested radio frequency (RF) energy from the ambient environment. The necessary power for SWIPT system operation is not always available and it depends on the available RF energy in the ambient environment, transmitted RF power from the SWIPT transmitter, and the distance from the transmitter and channel conditions. Thus, an efficient control and communication protocol is required which can control the SWIPT system for sensor applications which mainly consists of a transmitter and a receiver. Multiple data frame structures are used to optimize the exchange of bits for the communication and control of the SWIPT system. Both SWIPT transmitter and receiver are capable of using multiple modulation schemes which can be switched depending on the channel condition and the available RF energy in the ambient environment. This provides support for automatic switching between the time switching scheme and power splitting scheme for the distribution of received RF power in the SWIPT receiver. It also adjusts the digital clock frequency at the SWIPT receiver according to the harvested power level to optimize the power consumption. The SWIPT receiver controller with ACCP is implemented in 180 nm CMOS technology. The RF frequency of the SWIPT operation is 5.8 GHz. Digital clock frequency at the SWIPT receiver can be adjusted between 32 kHz and 2 MHz which provides data rates from 8 to 500 kbps, respectively. The power consumption and area utilization are 12.3 µW and 0.81 mm².

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Nguyen, Thu L. N., Jin-Young Kim, and Yoan Shin. "Ambient Backscattering-Enabled SWIPT Relaying System with a Nonlinear Energy Harvesting Model." Sensors 20, no. 16 (August 13, 2020): 4534. http://dx.doi.org/10.3390/s20164534.

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Since radio frequency (RF) signals can be used for both information transmission and energy harvesting, RF-based energy harvesting is capable of integrating with other existing communication techniques for providing better rate–energy tradeoff and quality-of-service. Within the context of an RF-based energy harvesting relaying network, a relay node not only acts as an intermediate node to help the delivery from source to destination, but also harvests energy from an RF dedicated source to prolong its lifetime. Thus, it brings diversity gain and coverage extension as well as provides extra energy for data transmission. This paper investigates a system that enables ambient backscattering communication-assisted simultaneous wireless information and power transfer at the relay. In the proposed system, a backscatter device plays a role as a relay to meet sustainable network coverage and to harvest ambient energy as well. With a power splitting (PS) scheme, we first investigate a nonlinear energy harvesting model at the relay node. In order to adapt to the channel gains, a dynamic PS ratio is required to perform well in changing environments. Moreover, we derive mathematical expressions for the outage probability and the achievable system throughput. Numerical results show the effects of various system parameters on the outage probability and the system throughput performance.

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

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Low power and portable systems working at high frequency are becoming a significant force in the communication industry. SAW filters have been used in wireless communication systems since the early days of mobile phones. But applications at the higher handset frequencies run up against the capability of conventional SAW structures. Bulk Acoustic Wave (BAW) Technology, a relatively recent addition to this portfolio follows MEMS principle to design high performance microwave components for RF communication. Simulation of the Bulk Acoustic Resonator using Butterworth Van Dyke Model (BVD) Model and design of Ladder Filter with the designed resonator in the RF design platform Agilent ADS (Advanced Design System) have been presented. The simulated results confirm the tuning of operating frequency of designed BAW device at 2.4 GHz.

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Kim, Tae Youn, Seong Bin Lim, Yong Sik Chun, and Seok Weon Choi. "Development of RF System Performance Evaluation Test Set for KOMPSAT-2." Key Engineering Materials 277-279 (January 2005): 845–50. http://dx.doi.org/10.4028/www.scientific.net/kem.277-279.845.

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The satellite RF system is an essential part of the control and management of a satellite from the ground station and provides a communication link during the entire satellite mission life. The RF system should be fully evaluated for reliability and stability on the ground, as defined by the requirements of the satellite mission. The evaluation of an RF system can be verified by measuring the RF link parameter and then comparing and analyzing the result with the RF system requirements. Since the system test for satellites requires advanced technology and has a high cost with limited time, however, it is difficult to access technically for many parts. This paper describes the design and verification of the RFTS (Radio Frequency Test Set) and the RTS (RFTS Test Software), which AITC developed in KARI to evaluate a satellite RF system. The developed test system was used to perform an RF functional test on an ETB (Engineering Test Bed), and the RFTS’s full functions were debugged to provide a reliable function for the KOMPSAT-2 Satellite Test. The RFTS showed a high degree of reliability, conformity and repeatability for each test case at any time. It is now being applied to the RF system evaluation test of KOMPSAT-2 FM during KOMPSAT-2’s integration and environment test phases. Hereinafter, this system can be applied to the next generation of satellites as well as to the RF payload system as a unique KOMPSAT series RF test system.

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Rakia, Tamer, Hong-Chuan Yang, Fayez Gebali, and Mohamed-Slim Alouini. "Optimal Design of Dual-Hop VLC/RF Communication System With Energy Harvesting." IEEE Communications Letters 20, no. 10 (October 2016): 1979–82. http://dx.doi.org/10.1109/lcomm.2016.2595561.

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Wong, Thomas, and Ming Yan. "RF channel performance assessment for a multiple carrier millimeter-wave communication system *." Progress in Natural Science 14, no. 10 (October 1, 2004): 885–88. http://dx.doi.org/10.1080/10020070412331344501.

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Ma, Hao, Hao Liu, and Zhi Qing Ma. "The Design of Communication System for Wearable Health Monitoring Equipment." Applied Mechanics and Materials 599-601 (August 2014): 1106–10. http://dx.doi.org/10.4028/www.scientific.net/amm.599-601.1106.

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Viewing the health care problem facing the aging society, an intelligent wearable monitoring system is designed, which is able to collecting real-time data and analyze the data for physiological parameters for a plurality of monitoring object. The system, with CAN bus interface chip C8051F040 low power and wireless RF chip nRF24L01 as the core, collect real-time multiple physiological parameters of monitored objects through wireless mode, and send the data to the monitoring center through high reliability CAN bus mode, so as to achieve the intelligent home health care function.

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Sáez, Yessica, José Muñoz, Francisco Canto, Antony García, and Héctor Montes. "Assisting Visually Impaired People in the Public Transport System through RF-Communication and Embedded Systems †." Sensors 19, no. 6 (March 14, 2019): 1282. http://dx.doi.org/10.3390/s19061282.

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For a significant number of people with visual impairments, public transport plays an important role in productivity, community participation, and independence, since it may be the only feasible mobility option to participate in their education, work, medical care, food, and to attend many other places in their community. To use the public bus system safely, effectively, and autonomously, these people need to collect information about their physical environment and visible information at stops and terminals, such as timetables, routes, etc. Unfortunately, most people who are blind or visually impaired experience difficulties in getting on the right bus or getting off at the right destination. These situations usually force them to depend on other people that assist them in activities close to their homes, or settle for simpler jobs, or simply stay at home. Therefore, our efforts should aim to develop a system where technology is used to empower people with visual disabilities, allowing them to navigate autonomously in the public transport system. This paper presents a system based on radio frequency (RF) communication proposed within the framework of the MOVIDIS (Mobility for Visually Disabled People) research project (funded by the National Secretariat of Science, Technology and Innovation-SENACYT, under Grants No. 109-2015-4-FID14-073 and No. 99-2018-4-FID17-031), which provides an alternative to assist people with visual disabilities with their mobility in the public transport system. The various modules of this system communicate with each other by means of radio frequency and allow users to interact with buses and their respective stops. The first experimental results show that RF communication represents a viable option to help people with visual disabilities in public transport services.

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Xu, Xia, Wei Wei Yao, and Liang Gong. "Information Technology in Intelligent Warehouse Management System Based on ZigBee." Advanced Materials Research 977 (June 2014): 468–71. http://dx.doi.org/10.4028/www.scientific.net/amr.977.468.

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Currently, RF technology for applications in logistics management, national research institutions and researchers devoted considerable effort. We also used some foreign advanced technologies in order to come to launch their own products, such as Shanghai Petrochemical BPM technology and logistics system will combine the ZigBee technology, the magnitude of such a system and application level information management further spread, which is the use of white sand and logistics jobs demand RFID technology to access cargo management, cargo inventory, position adjustment step, the basic realization of innovative research in the warehouse management system. Therefore, in the current intelligent warehouse management systems, wireless communication network technology applied to the management system has become an inevitable trend, on the one hand due to the wireless network can provide greater flexibility and mobility, in terms of eliminating a lot of wiring cost and effort, on the other hand it is more in line with internal information storage system data communications features in the future wireless network communication technology will further forward, so it will be able to greatly promote intelligent storage systems, networking process.

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Khalid, Hira, Sajid Sheikh Muhammad, Hector E. Nistazakis, and George S. Tombras. "Performance Analysis of Hard-Switching Based Hybrid FSO/RF System over Turbulence Channels." Computation 7, no. 2 (June 6, 2019): 28. http://dx.doi.org/10.3390/computation7020028.

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The hybrid system of free space optic (FSO) and radio frequency (RF) has come forth as alternative good solution for increasing demand for high data rates in wireless communication networks. In this paper, wireless networks with hard-switching between FSO and RF link are analyzed, assuming that at a certain time point either one of the two links are active, with FSO link having higher priority. As the signal-to-noise ratio (SNR) of FSO link falls below a certain selected threshold, the RF link is activated. In this work, it is assumed that the FSO link follows Gamma-Gamma fading due to the atmospheric turbulence effect whereas RF link experiences Rayleigh fading. To analyze the proposed hybrid model, analytical expressions are derived for the outage probability, bit error rate and ergodic capacity. A numerical comparison is also done between the performances of the proposed hybrid FSO/RF model and the single FSO model.

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