Journal articles: 'Broadband communication systems'

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Prasad, R. "Wireless Broadband Communication Systems." IEEE Communications Magazine 35, no. 1 (January 1997): 18. http://dx.doi.org/10.1109/mcom.1997.568189.

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Kishimoto, R., and I. Yamashita. "HDTV communication systems in broadband communication networks." IEEE Communications Magazine 29, no. 8 (August 1991): 28–35. http://dx.doi.org/10.1109/35.83971.

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Wu, Hao, Tao Liu, Jin Xu, and Fang Wang. "Parallel CRC architecture for broadband communication systems." Electronics Letters 53, no. 21 (October 2017): 1439–41. http://dx.doi.org/10.1049/el.2017.1029.

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YANG, Biao, Ying-hua LÜ, and Hong-xin ZHANG. "Coexistence of broadband power line communication systems." Journal of China Universities of Posts and Telecommunications 16, no. 4 (August 2009): 125–28. http://dx.doi.org/10.1016/s1005-8885(08)60259-9.

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Maktoomi, Md Hedayatullah, Soheil Saadat, Omeed Momeni, Payam Heydari, and Hamidreza Aghasi. "Broadband Antenna Design for Terahertz Communication Systems." IEEE Access 11 (2023): 20897–911. http://dx.doi.org/10.1109/access.2023.3250270.

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Romero-Castro, Mario, Mario Reyes-Ayala, Edgar Alejandro Andrade-Gonzalez, Nicolas Reyes-Ayala, and Hilario Terres-Peña. "Broadband Printed Modified Dipole for Personal Communication Systems." WSEAS TRANSACTIONS ON COMMUNICATIONS 19 (January 13, 2021): 223–30. http://dx.doi.org/10.37394/23204.2020.19.26.

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In this paper a modified printed dipole is proposed for mobile terminals operating in the first band of Personal Communication System (PCS) that is ranging from 800 to 900 MHz. One of the most important features of this kind of antenna is its wide bandwidth as required in the mentioned band. The modified design of the proposed antenna allows the user to move in any direction as is usual in mobile communications. The results of this article include an analytical design, simulations that have been performed numerically using a Finite Element Method (FEM) computational tool, structure optimization in order to maximize the antenna bandwidth and experimental measurements with the aim of spatial evaluating of electromagnetic radiated fields.

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Belicheva, K. V., R. S. Yonushauskayte, and S. A. Pavlov. "Prospects for visible color for underwater wireless broadband communications." Applied photonics 10, no. 7 (December 28, 2023): 91–116. http://dx.doi.org/10.15593/2411-4375/2023.7.07.

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Nowadays, underwater wireless communications are realized through communication systems based on acoustic waves, electromagnetic waves (radiofrequency waves and low frequency waves), magnetic induction and visible light. This paper provides a basic problems and key aspects in the development of underwater wireless optical communication systems. The latter attracts considerable interest from science, industry and ecology as an effective solution to satisfy the rapidly increasing demands of underwater high data-rate transmission on at any depth. However, severe aquatic channel conditions (absorption, scattering, turbulence, etc.) significantly reduce the attainable communication ranges. The second serious problem limiting the functioning of wireless optical communication systems is the difficulty of aligning the transmitter beam with the receiver's field of view. Two main types between transmitter and receiver are considered: diffuse line-of-sign (wide-beam) configuration and point-to-point light-of-sign (narrow-beam) configuration. Diffuse line-of-sign communication have reduced alignment requirements, but data rates and distances are noticeably lower than in narrow-beam systems. The main technical solutions for adjusting the receiver and transmitter in narrow-beam communication systems are discussed in this paper.

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Osipov, D. L., and A. A. Gavrishev. "ANALYSIS OF THE USE OF CHAOTIC SIGNALS FILTERED WITH A BANDPASS FILTER FOR DATA TRANSFER OPERATION IN RADIO COMMUNICATION SYSTEMS." NAUCHNOE PRIBOROSTROENIE 31, no. 2 (May 25, 2021): 93–104. http://dx.doi.org/10.18358/np-31-2-i93104.

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The analysis of the use of chaotic signals filtered through a broadband bandpass filter to ensure stealth and reliability of data transmission operations in radio communication systems is carried out. Time realizations of chaotic signals generated by the well-known Chua and Rikitake generators are obtained. They were filtered using a broadband bandpass filter, and the data obtained was studied using BDS-statistic and crest factor. As a result of the studies, it was found that under certain research conditions, time realizations of Chua generator and Rikitake generator, obtained by broadband filtering, are suitable. Other considered time realizations are not suitable for radio communication systems, since either they have low stealth from the outside observer, or they have an unacceptable crest factor value for radio communication systems. From this we can conclude that filtering chaotic signals using a broadband bandpass filter as a whole is a promising approach to ensure the stealth and reliability of data transmission in radio communication systems. The authors, basing on the conducted research and conclusions from well-known works, consider it appropriate to use broadband filtering to ensure the stealth and reliability of data transmission in radio communication systems when using chaotic signals, along with widely used methods.

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Kim, Byung‐Chul, and I. ‐Tai Lu. "Underwater acoustic channel simulator for broadband communication systems." Journal of the Acoustical Society of America 109, no. 5 (May 2001): 2451. http://dx.doi.org/10.1121/1.4744688.

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Taira, Akinori, Fumio Ishizu, and Makoto Miyake. "AGC output characteristics in broadband mobile communication systems." Electronics and Communications in Japan (Part I: Communications) 86, no. 2 (October 16, 2002): 42–50. http://dx.doi.org/10.1002/ecja.1152.

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Maksymov, Volodymyr, Vyacheslav Noskov, and Igor Khrapovytsky. "NEW BARKER’s COMPOSITE CODES AS MODULATION SIGNALS IN BROADBAND COMMUNICATION SYSTEMS." Information and Telecommunication Sciences, no. 2 (December 19, 2022): 15–20. http://dx.doi.org/10.20535/2411-2976.22022.15-20.

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Background. Currently noise-like signals (NLS) are widely used and provide high level of jamming immunity and security in broadband communication systems (BСS) when transmitting confidential information in an open radio channel, especially in emergencies. Increasing the efficiency of the NLS is possible when using more advanced code structures. Objective. The purpose of this research is to study new Barker’s composite codes as modulation signals in broadband communication systems. Method. Simulation modeling based on MatLab software package and analytical calculation methods are used. Results. Modeling in the MatLab software package showed the possibility for using new Barker’s composite codes as modulation signals in direct spread spectrum systems but efficiency depends on code words length as well as type synchronization signal. Conclusions. Analysis of research results shows that the new Barker composite codes 21a, 33a, 49, 77a, 121 can be effectively used as modulation code words in broadband systems with direct spectrum expansion.

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Orhan, Oner, Deniz Gunduz, and Elza Erkip. "Energy Harvesting Broadband Communication Systems With Processing Energy Cost." IEEE Transactions on Wireless Communications 13, no. 11 (November 2014): 6095–107. http://dx.doi.org/10.1109/twc.2014.2328600.

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He, Kai, Shu‐Xi Gong, and Da Guo. "Broadband omnidirectional distributed antenna for indoor wireless communication systems." Electronics Letters 52, no. 16 (August 2016): 1361–62. http://dx.doi.org/10.1049/el.2016.0832.

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Jovic, Branislav. "Class of novel broadband chaos-based coherent communication systems." IET Communications 11, no. 12 (August 24, 2017): 1970–84. http://dx.doi.org/10.1049/iet-com.2016.0432.

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Seifouri, Mahmood, Parviz Amiri, and Majid Rakide. "Design of broadband transimpedance amplifier for optical communication systems." Microelectronics Journal 46, no. 8 (August 2015): 679–84. http://dx.doi.org/10.1016/j.mejo.2015.05.007.

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Pakravan, Mohammad Reza, and Mohsen Kavehrad. "Design considerations for broadband indoor infrared wireless communication systems." International Journal of Wireless Information Networks 2, no. 4 (October 1995): 223–38. http://dx.doi.org/10.1007/bf01538147.

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Chae, Chan-Byoun, Antonio Forenza, Robert Heath, Matthew McKay, and Iain Collings. "Adaptive MIMO transmission techniques for broadband wireless communication systems [Topics in Wireless Communications." IEEE Communications Magazine 48, no. 5 (May 2010): 112–18. http://dx.doi.org/10.1109/mcom.2010.5458371.

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Liang, Thow Yick. "Strategic exploitation of information and communication technology in the healthcare sector." Human Systems Management 21, no. 4 (November 11, 2002): 241–48. http://dx.doi.org/10.3233/hsm-2002-21403.

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Among the various industrial sectors in Singapore, healthcare was the first to exploit broadband technology. In 1997, the Singapore General Hospital installed a broadband backbone even before the technology was generally viable. Today, the system supports the transmission of high-quality X-rays, CT- and MRI-scanned images, and electrocardiogram. And the latest decision is to supplement the existing facilities with wireless technology. This paper examines the strategic use of infocomm technology in the healthcare sector focusing on some recent technologies such as electronic data interchange, the Internet, e-commerce, broadband network and wireless technology. The patient-friendliness and the intelligence level of the entire healthcare sector are also analyzed. Besides, the strong coupling between human minds and artificial infocomm systems in healthcare may have stretched the interactions between the two systems into the nonlinear domain. The consequences may be a more innovative development of new infocomm systems and a more strategic exploitation of infocomm technology.

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Buzenkov, I. I., A. A. Tyufanova, and E. P. Khaleeva. "On the possibility of organizing communication for e-Navigation in the coastal zone using radio-technical posts of the vessel traffic control system." Journal of Physics: Conference Series 2061, no. 1 (October 1, 2021): 012110. http://dx.doi.org/10.1088/1742-6596/2061/1/012110.

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Abstract The concept of e-Navigation is to unify activities for the collection, integration, exchange, presentation and analysis of information on vessels and in coastal services through electronic technologies to improve the navigation safety, and the quality and efficiency of the relevant services.The generalized analysis of the obtained data is used to determine the appropriate actions in the prevailing conditions, to improve the process of the vessel’s transition from berth to berth (in ports of departure and destination) and the corresponding services that ensure the safety of navigation, environmental protection, information exchange between intelligent transport systems.The basis for fulfilling the assigned tasks are three basic components of e-Navigation: vessel systems; coastal and satellite systems; communication infrastructure. The purpose of the paper is the possibility of applying broadband radio communications for unmanned navigation in the coastal zone. The research object is the analysis of broadband communication systems; the subject is the assumed range of the WiMAX radio communication zone. EMC Planner 1.1_170328 is used to simulate the anticipated WiMAX radio zone.

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Kubrak, O. M., V. O. Cholpanov, and I. M. Dyukov. "ESTIMATION OF BIT ERROR PROBABILITIES OF COMMUNICATION SYSTEMS WITH FM BROADBAND SIGNALS." Проблеми створення, випробування, застосування та експлуатації складних інформаційних систем, no. 18 (December 30, 2020): 23–31. http://dx.doi.org/10.46972/2076-1546.2020.18.03.

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Today, wireless communication is one of the most promising areas in the field of communications. Modern radio communication systems and facilities operate in a complex electronic environment. The development of next-generation wireless networks depends on both transmitting and receiving equipment, which must provide the high data rates needed to maintain a reliable level of interference protection. The main factors influencing the quality of radio communication are natural and intentional interference in the radio wave propagation channel, multi-beam propagation, bandwidth limitation and the need for asynchronous access. One of the possible methods of partial solution of the above problems is the use of extended spectrum communication systems. The article investigates the effectiveness of different types of phase modulation used for Direct Sequence Spread Spectrum systems. An idealized channel with additive white Gaussian noise was chosen as the radio wave propagation channel. It has been observed that Binary phase shift keying radio systems achieve better Bit error rate values than other systems. The research was conducted in the environment of dynamic interdisciplinary modeling of complex technical systems - Simulink (the main tool for model-oriented design), whose main interface is a graphical tool for charting and a flexible set of libraries of functional blocks. The simulation results showed that for a given data rate and under the influence of AWGN on the propagation channel, DSSS-BPSK was more resistant to the negative effects of white noise. Future research will focus on evaluating the effectiveness of the SSS communication system in the event of different types of interference.

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Liu, Zuo Xue, Jian Mei Dai, and Bo Liu. "The Design of Wireless Broadband Communication System Based on OFDMA." Applied Mechanics and Materials 241-244 (December 2012): 2275–78. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.2275.

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A Wireless Broadband Communication System has been made up based on OFDMA and AMC technologies. The system structure and working pattern is introduced, the OFDMA allocation model, the MIMO and AMC scheme are present, and the parameter such as transmitting power, receiver sensitivity, transmitting antenna gain and receiving antenna gain are designed. The system enables high quality wireless broadband communication. As a supplement with wired communication systems, the system could fulfill the requirement of recovery local communication rapidly when some accidents take place.

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Bekkadal, Fritz. "Arctic Communication Challenges." Marine Technology Society Journal 48, no. 2 (March 1, 2014): 8–16. http://dx.doi.org/10.4031/mtsj.48.2.9.

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AbstractThe vast geographic distances and the economic importance of activities in remote areas like the Arctic demand new innovative radio-based solutions. There are numerous unsolved research challenges pertaining to (broadband) radio communication coverage and satellite navigation reliability throughout the large region composed of the Norwegian Exclusive Economic Zone and the Arctic waters.This paper outlines these challenges and the current situation, in addition to identifying future systems capable of mitigating the crucial lack of adequate electronic communications infrastructure in the High North.

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Seymour, Tom, and Ali Shaheen. "History of Wireless Communication." Review of Business Information Systems (RBIS) 15, no. 2 (April 11, 2011): 37–42. http://dx.doi.org/10.19030/rbis.v15i2.4202.

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The history of communication is an exciting topic. This article reviews various areas that makeup the current history of wireless communication. These topics include: the wireless vision, generations of wireless, technical issues, current wireless systems, wireless LaNs, Wide Area Wireless Data Services, Broadband Wireless Access, Satellite Wireless Access, Satellite Networks, and Bluetooth and this material will stimulate you to do more research in these various areas of the wireless industry.

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Khezzar, Djamel, Djamel Khedrouche, and Tayeb A. Denidni. "60 GHz Broadband LTCC Antenna for 5G Mobile Communication Systems." Instrumentation Mesure Métrologie 20, no. 1 (February 28, 2021): 1–5. http://dx.doi.org/10.18280/i2m.200101.

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This paper provides a numerical investigation in designing wideband circularly polarized 60 GHz antenna using Low-Temperature Co-fired Ceramic technology (LTCC). The LTCC provides high-density multilayer integration, low dielectric loss, and low costs. The use of LTCC technology is advantageous for easy and flexible 3D integration and freer vias distribution in the substrate. The designed antenna focuses on obtaining a better trade-off in terms of size, gain, circular polarization (CP), and large bandwidth. The circular polarization was chosen in order to minimize the transmission errors caused by polarization inconsistency between the transmitter and the receiver. The antenna geometry is developed taking into consideration the design rules of the LTCC with a layer thickness of 100 µm after firing and a metal layer thickness of 9 µm. A bandwidth of more than 33% centered at 60 GHz was obtained for this designed multilayer antenna. The results are obtained by using the High-Frequency Structure Simulator (HFSS). The proposed integrated antenna can be used in future 5G wireless communication systems and other 60 GHz spectrum applications.

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UEHARA, Kazuhiro. "Trends in Broadband Wireless Communication Systems and Software Defined Radios." Interdisciplinary Information Sciences 12, no. 2 (2006): 163–72. http://dx.doi.org/10.4036/iis.2006.163.

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Zhengjuan, Tian, Chen Rui, Long Wenxuan, Zhou Hong, and Moretti Marco. "Broadband beam steering for misaligned multi-mode OAM communication systems." Journal of Systems Engineering and Electronics 32, no. 4 (August 2021): 779–88. http://dx.doi.org/10.23919/jsee.2021.000067.

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Wagner, J., N. Joram, R. Wolf, and F. Ellinger. "Broadband inductorless vector modulator IC for localisation and communication systems." Electronics Letters 51, no. 10 (May 2015): 767–69. http://dx.doi.org/10.1049/el.2015.0343.

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

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Gui, Guan, Wei Peng, and Fumiyuki Adachi. "High-resolution compressive channel estimation for broadband wireless communication systems." International Journal of Communication Systems 27, no. 10 (December 14, 2012): 2396–407. http://dx.doi.org/10.1002/dac.2483.

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Sathishkumar, N., Rajesh Natarajan, D. Divya, and S. Divya. "A broadband dual-polarized antenna for 5G wireless communication systems." Results in Optics 15 (May 2024): 100659. http://dx.doi.org/10.1016/j.rio.2024.100659.

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Azhmukhamedov, Iscandar Maratovich, and Evgeny Melnikov. "Upper bound of probability of receiving error of aperiodic pseudo-random sequence at jamming." Vestnik of Astrakhan State Technical University. Series: Management, computer science and informatics 2020, no. 1 (January 27, 2020): 64–72. http://dx.doi.org/10.24143/2072-9502-2020-1-64-72.

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The article discusses the obtained estimate of the upper bounds for the probable receiving error of the synchronizing sequence during sensor phasing of aperiodic pseudo-random sequences (CRR) in broadband communication systems in the channels of low quality with strong disturbances of natural and organized structure. The obtained results allow to design synchronization systems of pseudo-random sequences for the worst case, which guarantees their reliable operation in low-quality channels, and, unlike the well-known methods, the estimation of synchronization of aperiodic pseudo-random sequence sensors doesn’t depend on the error distribution in the communication channel and the period of sequence. The appointed differences simplify the evaluation of synchronization in the operation of broadband communication systems in low-quality channels.

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Tuzlukov, Vyacheslav. "Performance of Generalized Receiver Employed by Broadband Multicarrier DS-CDMA System Using Space-Time Spreading-Assisted Transmit Diversity." WSEAS TRANSACTIONS ON COMMUNICATIONS 20 (September 29, 2021): 152–71. http://dx.doi.org/10.37394/23204.2021.20.21.

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In this paper the multicarrier direct-sequence code-division multiple access (MC DS-CDMA) using space-time spreading assisted transmit diversity is investigated in the context of broadband wireless communi-cations systems constructed based on the generalized approach to signal processing in noise over frequency-se-lective Rayleigh fading channels. We consider the issue of parameter design for the sake of achieving high-ef-ficiency communications in various dispersive environments. In contrast to the conventional MC DS-CDMA wireless communication system employing the time (T)-domain spreading only, in the present paper the broad-band wireless MC DS-CDMA wireless communication schemes employ both the time (T)-domain and frequen-cy (F)-domain spreading, i.e., employ the TF-domain spreading. The bit-error rate (BER) performance of the space-time spreading assisted broadband MC DS-CDMA wireless communications system is investigated for down-link transmissions associated with the single user and multiuser generalized detectors and is compared with that of the single user correlation detector and the multiuser decorrelating detector. Our study demonstra-tes that with appropriately selecting the system parameters, the broadband MC DS-CDMA wireless communi-cation system using the space-time spreading assisted transmit diversity constitutes a promising downlink tran-smission scheme. This scheme is capable to support ubiquitous communications over diverse communication environments without the BER performance degradation

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Ancans, G., V. Bobrovs, and G. Ivanovs. "Spectrum Usage in Mobile Broadband Communication Systems / RADIOFREKVENČU IZMANTOŠANA MOBILO PLATJOSLAS SAKARU SISTĒMĀS." Latvian Journal of Physics and Technical Sciences 50, no. 3 (June 1, 2013): 49–58. http://dx.doi.org/10.2478/lpts-2013-0019.

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The increased demand of mobile broadband consumers on services in the mobile environment with high data rate and technologically developed mobile broadband communication systems will require more spectrum to be available in the future. The new technologies as well as the existing services require frequencies for their development. The authors investigate the available and potential future mobile terrestrial frequency bands - worldwide and in Europe. An insight into the spectrum management is provided, with radio access technologies, methods for more efficient use of mobile frequency bands and frequency cross-border coordination also addressed. It is stressed that the radio frequency spectrum is a limited national resource that will become increasingly precious in the future.

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Cui, Jian Hua, and Nai Ping Cheng. "Adaptive Algorithm for Anti-Jamming in Broadband Communication." Applied Mechanics and Materials 716-717 (December 2014): 1252–56. http://dx.doi.org/10.4028/www.scientific.net/amm.716-717.1252.

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This paper presents a method to suppress narrowband interference in the direct sequence spread spectrum communication based frequency domain adaptive algorithm. The method determines the interference threshold by N-sigma algorithm and calculates the cut-off condition by separating the signal. The method suppresses the narrowband interference by frequency domain batch algorithm. This paper gives a detailed design method and simulation results, and makes a performance comparison with other methods. The results show that, the method in this paper has better performance than other methods. It is suitable for narrowband interference suppression in broadband systems.

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Tsiligkaridis, Theodoros, and Douglas L. Jones. "PAPR Reduction Performance by Active Constellation Extension for Diversity MIMO-OFDM Systems." Journal of Electrical and Computer Engineering 2010 (2010): 1–5. http://dx.doi.org/10.1155/2010/930368.

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The V-BLAST wireless communication architecture, space-time block code (STBC), and space-frequency block code (SFBC) techniques are strong candidates for achieving very high data rates in 4G broadband wireless communications. This paper extends the efficient Active Constellation Extension Smart Gradient-Project (ACE-SGP) peak-to-average power (PAPR) reduction method to STBC, SFBC, and V-BLAST systems. Simulation results show 4.19 and 3.57 dB of PAPR reduction for the Alamouti STBC and SFBC, respectively.

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Li, Changzhen, Junyi Yu, Jie Xue, Wei Chen, Shoufeng Wang, and Kun Yang. "Maritime Broadband Communication: Wireless Channel Measurement and Characteristic Analysis for Offshore Waters." Journal of Marine Science and Engineering 9, no. 7 (July 20, 2021): 783. http://dx.doi.org/10.3390/jmse9070783.

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For a long time, the development of maritime communication has been restricted by the low data rate, high-latency and high cost of the current communication systems. The upgrade of new generation mobile communication technologies is attracting more and more attention to conduct a shore-based broadband mobile communication network with high-latency and high reliability to serve the maritime industries. This paper presents a solution by means of building a ship-to-infrastructure (S2I) and a ship-to-ship (S2S) wireless communication networks for an offshore region. We characterize the S2I and S2S channels at 5.9 GHz band based on the channel measurements in realistic environments. The channel characteristics, including power delay profile, delay spread, propagation path loss, are extracted and analyzed. In view of the difference between marine and terrestrial communications, we analyze the influencing factors of the offshore water, including effective reflection, divergence and shadowing from the water surface, and diffraction loss caused by the earth curvature. We also predict the power coverage range and the channel capacity for S2I and S2S wireless communications. Finally, the communication performance is evaluated according to the channel measurement and characterization analysis. The research results can be a reference for the construction of maritime communication networks.

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Perov, Sergey Yu, Olga V. Belaya, Quirino Balzano, and Nina B. Rubtsova. "The problems of mobile communication electromagnetic field exposure assessment today and tomorrow." Russian Journal of Occupational Health and Industrial Ecology 60, no. 9 (October 7, 2020): 597–99. http://dx.doi.org/10.31089/1026-9428-2020-60-9-597-599.

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New and necessary improvements of electromagnetic exposure assessment principles and methods are considered and presented. The electromagnetic field exposure assessment is the physical basis for hygienic and biological research and needs s to consider the new technological features of emerging 5G mobile systems in addition to existing 2-4G systems. The new generation of telecommunication networks will cause significantly novel electromagnetic field exposure, in particular for time-frequency and spatial parameters. A complex exposure assessment based on refined broadband measurements seems to be the proper and necessary approach to the enhancement of Russian EMF assessment guidelines. Simple broadband EMF measurements are the common approach for present exposure assessment and cannot be used any longer as the only measure for multiple 5G sources exposure evaluation. Then again broadband measurements are the simple and practical approach for mm wave in-situ exposure assessment. Frequency-selective and code-selective measurements provide detailed EMF level distribution in separate frequency channels, telecommunication services or sources and are a promising approach for objective exposure assessment.

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Vahid oğlu Nasiyev, Müslim. "Research and application of satellite communication networks as an alternative to modern communication systems." SCIENTIFIC WORK 68, no. 07 (July 22, 2021): 78–83. http://dx.doi.org/10.36719/2663-4619/68/78-83.

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Research work has been devoted to show how satellite technology can meet a variety of human needs and the ultimate measure of its effectiveness. Communication satellites, whether in geostationary Earth orbit (GEO) or non GEO, provide an effective platform to relay radio signals between points on the ground. The users who employ these signals enjoy a broad spectrum of telecommunication services on the ground, at sea, and in the air. In recent years, such systems have become practical to the point where a typical household can have its own satellite dish. That dish can receive a broad range of television programming and provide broadband access to the Internet. Key words: satellite, antenna, Earth orbit (GEO), transponder, VHF, frequency modulation (FM)10.36719/2663-4619/68/78-83 Müslim Vahid oğlu Nasiyev Azərbaycan Texniki Universiteti magistrant mnesiyev@gmail.com MÜASİR RABİTƏ SİSTEMLƏRİNƏ ALTERNATİV OLARAQ, PEYK RABİTƏ ŞƏBƏKƏLƏRİNİN ARAŞDIRILMASI VƏ TƏTBİQİ Açar sözlər: Peyk, antena, yer orbiti (GEO), transponder, VHF, tezlik modulyasiyası (FM) Research and application of satellite communication networks as an alternative to modern communication systems Summary Research work has been devoted to show how satellite technology can meet a variety of human needs and the ultimate measure of its effectiveness. Communication satellites, whether in geostationary Earth orbit (GEO) or non GEO, provide an effective platform to relay radio signals between points on the ground. The users who employ these signals enjoy a broad spectrum of telecommunication services on the ground, at sea, and in the air. In recent years, such systems have become practical to the point where a typical household can have its own satellite dish. That dish can receive a broad range of television programming and provide broadband access to the Internet. Key words: satellite, antenna, Earth orbit (GEO), transponder, VHF, frequency modulation (FM)

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Li, Hao, Lu Xu, Feng Qian, and Yong Zhou. "Train-mounted Broadband Monopole Antenna for 5G Communication." Applied Computational Electromagnetics Society 36, no. 7 (August 19, 2021): 879–84. http://dx.doi.org/10.47037/2021.aces.j.360709.

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As a convenient and efficient public transport system, high speed railway (HSR) was rapidly deployed in China. Since the fifth generation (5G) mobile communication system is commercially applied, it is necessary for mobile terminals antennas to cover multiple operating bands to be compatible with various communication systems. Here a HSR-mounted broadband and high-gain monopole antenna is proposed. By using the meander technology and introducing the tapered structure, the proposed antenna operates over a bandwidth of 694-960 MHz and 1350-5975 MHz (VSWR<1.8), which covers both 2G-5G mobile communication and WiFi frequency bands. The dimensions of the proposed antenna are 400 mm × 330 mm × 78 mm. The measured average gain is 6.11 dBi over the entire bandwidth.

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Manoufali, Mohamed, Hamada Alshaer, Peng-Yong Kong, and Shihab Jimaa. "An Overview of Maritime Wireless Mesh Communication Technologies and Protocols." International Journal of Business Data Communications and Networking 10, no. 1 (January 2014): 1–29. http://dx.doi.org/10.4018/ijbdcn.2014010101.

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Maritime wireless mesh networks (MWMNs) are conceived to provide network connectivity for maritime users and enable them to communicate with correspondent users connected to terrestrial communication networks. The high cost and low data-rate of satellite and other legacy maritime communication technologies and systems deployed in MWMNs pose major limitation to establish reliable and affordable maritime communications. In addition, the design of routing protocols in MWMNs remains a significant challenge due to the lack of reliable communication infrastructure and complexity of maritime environment. This paper explains the existing maritime communication technologies and routing protocols which could be deployed in implementing reliable MWMNs. Comprehensive guidelines are outlined to easily understand and critically assess the different deployed maritime communication networks and systems with routing protocols, and identify the milestones in the process of developing and implementing broadband MWMNs.

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Esa, Mazlina, Nik Noordini Nik Abd. Malik, Mohd Khairul Hisham Ismail, and Shipun Anuar Hamzah. "Performance Investigation of Microstrip Klopfenstein Tapered Line Impedance Transformer Using MathCAD Software for Communication System." Applied Mechanics and Materials 781 (August 2015): 57–60. http://dx.doi.org/10.4028/www.scientific.net/amm.781.57.

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Impedance transformer is highly desirable in systems such as microwave communication systems for compensating impedance mismatches. Such device that can perform over broadband frequencies find numerous applications. This article presents the design and investigation of a microstrip Klopfenstein tapered line impedance transformer, KTLI. In ideal condition, it must possess minimum passband reflection coefficient for a given taper length. For specific reflection coefficient, there is a minimum value of taper length. The investigation is based on analytical equations which were computed using MathCAD. The reflection coefficient and return loss responses were found to be in good agreement with theory. Broadband characteristics were observed.

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Dasari, Anusha. "Optical Fiber Communication Evolution,Technology and Future Trends." Journal of Advance Research in Electrical & Electronics Engineering (ISSN: 2208-2395) 2, no. 8 (August 31, 2015): 28–35. http://dx.doi.org/10.53555/nneee.v2i8.181.

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Fiber optic systems are important telecommunication infrastructure for world-wide broadband networks. Wide bandwidth signal transmission with low delay is a key requirement in present day applications. Optical fibers provide enormous and unsurpassedtransmission bandwidth with negligible latency, and are now the transmission medium of choice for long distance and high data ratetransmission in telecommunication networks. This paper gives an overview of fiber optic communication systems including their keytechnologies, and also discusses their technological trend towards the next generation.

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Qiu, Chencheng, Liu Liu, Botao Han, Jiachi Zhang, Zheng Li, and Tao Zhou. "Broadband Wireless Communication Systems for Vacuum Tube High-Speed Flying Train." Applied Sciences 10, no. 4 (February 18, 2020): 1379. http://dx.doi.org/10.3390/app10041379.

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A vactrain (or vacuum tube high-speed flying train) is considered as a novel proposed rail transportation approach in the ultra-high-speed scenario. The maglev train can run with low mechanical friction, low air resistance, and low noise mode at a speed exceeding 1000 km/h inside the vacuum tube regardless of weather conditions. Currently, there is no research on train-to-ground wireless communication system for vactrain. In this paper, we first summarize a list of the unique challenges and opportunities associated with the wireless communication for vactrain, then analyze the bandwidth and Quality of Service (QoS) requirements of vactrain’s train-to-ground communication services quantitatively. To address these challenges and utilize the unique opportunities, a leaky waveguide solution with simple architecture but excellent performance is proposed for wireless coverage for vactrains. The simulation of the leaky waveguide is conducted, and the results show the uniform phase distribution along the horizontal direction of the tube, but also the smooth field distribution at the point far away from the leaky waveguide, which can suppress Doppler frequency shift, indicating that the time-varying frequency-selective fading channel could be approximated as a stationary channel. Furthermore, the train-to-ground wireless access architectures based on leaky waveguide are studied and analyzed. Finally, the moving scheme is adopted based on centralized, cooperative, cloud Radio Access Network (C-RAN), so as to deal with the extremely frequent handoff issue.

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Типаков, Василий, Vasily Sergeevich Tipakov, Тимур Яковлев, and Timur Aleksandrovich Yakovlev. "Problems of constructing broadband radio access systems of mobile radio communication." Vestnik of Astrakhan State Technical University 2019, no. 2 (November 19, 2019): 24–30. http://dx.doi.org/10.24143/1812-9498-2019-2-24-3.

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The article is focused on the problem of degrading the signals of broadband 3G / 4G mobile radio access systems in places of subscribers clustering and in so-called “dead zones”. The analysis of the actual principles of building mobile networks has been carried out, the main disadvantages of the approaches to the development of cellular networks have been identified. The current trend of building macro cells in the urban environment has lost its effectiveness due to the increasing frequencies used; it has to be replaced by a fundamentally new way of planning mobile networks. A new principle of providing access to mobile communications “from inside to outside” is proposed, which takes into account the needs of a large number of subscribers in the premises. It is based on setting the maximum number of internal base stations fully meeting the needs of internal network users. Such a distinction will positively affect all subscribers and improve the experience from using the high-quality services of the mobile operators, which will result in increasing the economic performance

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Liu, Yuanzhi, and Mustapha C. E. Yagoub. "Compact, Broadband, and Omnidirectional Antenna Array for Millimeter-Wave Communication Systems." Journal of Microwaves, Optoelectronics and Electromagnetic Applications 20, no. 2 (June 2021): 297–306. http://dx.doi.org/10.1590/2179-10742021v20i21114.

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Zhao, Bai, Huaicong Kong, Xiaoyu Liu, Min Lin, Jian Ouyang, and Wei-Ping Zhu. "Transmit diversity and performance analysis for aeronautical broadband satellite communication systems." Physical Communication 48 (October 2021): 101424. http://dx.doi.org/10.1016/j.phycom.2021.101424.

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Lisboa, A. C., D. A. G. Vieira, J. A. Vansconcelos, R. R. Saldanha, and R. H. C. Takahashi. "Decreasing Interference in Satellite Broadband Communication Systems Using Modeled Reflector Antennas." IEEE Transactions on Magnetics 44, no. 6 (June 2008): 958–61. http://dx.doi.org/10.1109/tmag.2008.916536.

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Rakide, Majid, Mahmood Seifouri, and Parviz Amiri. "A folded cascade-based broadband transimpedance amplifier for optical communication systems." Microelectronics Journal 54 (August 2016): 1–8. http://dx.doi.org/10.1016/j.mejo.2016.05.003.

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Yeh, Szu-Ming, Sheng-Lung Huang, Yi-Jen Chiu, Hidenori Taga, Pi Ling Huang, Yi-Chung Huang, Yu-Kuan Lu, et al. "Broadband Chromium-Doped Fiber Amplifiers for Next-Generation Optical Communication Systems." Journal of Lightwave Technology 30, no. 6 (March 2012): 921–27. http://dx.doi.org/10.1109/jlt.2012.2182758.

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Lee, Hyunwoo, and Byungje Lee. "Compact Broadband Dual-Polarized Antenna for Indoor MIMO Wireless Communication Systems." IEEE Transactions on Antennas and Propagation 64, no. 2 (February 2016): 766–70. http://dx.doi.org/10.1109/tap.2015.2506201.

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Journal articles on the topic 'Broadband communication systems'

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