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Journal articles on the topic 'Telecommunication systems – Noise'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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1

Kropotov, Y. A., A. A. Belov, and A. Y. Prockuryakov. "Increasing signal/acoustic interference ratio in telecommunications audio exchange by adaptive filtering methods." Information Technology and Nanotechnology, no. 2416 (2019): 271–76. http://dx.doi.org/10.18287/1613-0073-2019-2416-271-276.

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The paper deals with the issues of increasing signal/noise ratio in telecommunication audio exchange systems. The study of characteristics of speech signals and acoustic noises, such as mathematical expectation, dispersion, relative intensity of acoustic speech signals and various types of acoustic noises and interference is carried out. It is shown that in the design of telecommunications systems, in particular loudspeaker systems operating under the influence of external acoustic noise of high intensity, it is necessary to solve the problem of developing algorithms to effectively suppress th

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Кропотов, Юрий, Yuriy Kropotov, Алексей Белов, Aleksey Belov, Александр Проскуряков, and Aleksandr Proskuryakov. "EFFECTIVENESS INCREASE IN AUDIO EXCHANGE TELECOMMUNICATION SYSTEMS UNDER CONDITIONS OF EXTERNAL ACOUSTIC NOISE BY METHODS OF ADAPTIVE FILTERING." Bulletin of Bryansk state technical university 2019, no. 3 (2019): 71–77. http://dx.doi.org/10.30987/article_5c8b5cebac6217.27543313.

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Signal processing in the telecommunication systems of audioinformation exchange is conditioned on the requirement in the separation of useful speech acoustic information, in the increase of the verification of information perception by subscribers of a communication system, in the stability increase of telecommunication systems at the suppression of external acoustic interference and echosignal compensations. Therefore during designing telecommunication systems, in particular, speakerphone systems (SS) operating under conditions of an active impact of external acoustic interference and echosig

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Abbasova, T. S. "Development of rules in expert systems for the analysis and evaluation of telecommunications." Informacionno-technologicheskij vestnik 12, no. 2 (2017): 47–63. http://dx.doi.org/10.21499/2409-1650-2017-2-47-63.

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Typical malfunctions that may occur in telecommunication systems due to the failure to meet the noise immunity requirements, as well as the characteristic features that can identify these problems, are analyzed. In the process of developing the knowledge base for the expert system for assessing the telecommunications infrastructure, the existing tools for developing knowledge bases have been improved.

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Lyakhovetsky, L. "Method of estimation of interference noise in transmission systems with orthogonal harmonic signals." Metrology and instruments, no. 3 (March 7, 2018): 17–20. http://dx.doi.org/10.33955/2307-2180(3)2018.17-20.

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The method of estimation of interference noise that arises in transmission systems with orthogonal harmonic signals due to linear distortions of signals in the telecommunication channel is proposed. The method can be used both for simulation of telecommunication systems, and for the construction of measuring devices with the function of estimation of interference noise based on the results of measuring the characteristics of the telecommunication channel.The results of estimation of interference noise for ADSL2 + subscriber access transmission system are presented.

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Kropotov, Yu A., A. A. Belov, A. A. Kolpakov, and A. Yu Proskuryakov. "The syllable intelligibility in the system of information transmission by speech signals depending on the intensity of acoustic noise." Information Technology and Nanotechnology, no. 2416 (2019): 277–82. http://dx.doi.org/10.18287/1613-0073-2019-2416-277-282.

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The paper investigates the effect of the signal-to-noise ratio on syllable intelligibility under the intense influence of external acoustic interference when exchanging voice messages in telecommunication systems of public address systems. The article discusses the effect on the syllable intelligibility of the signal / external acoustic noise ratio, examines the effect of the integral articulation index, the dependence of the perception coefficient of formants on the relative level of formant intensity, the dependence of the formant parameter on the geometric mean frequency of the i-th spectru

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Abbasova, Tatiana Sergeevna, Natalya Petrovna Sidorova, Natalya Nikolaevna Teodorovich, and Elshan Maggeram Oglu Abbasov. "Evaluation of Telecommunications Electromagnetic Compatibility with the Use of Three-Dimensional Modeling Technology." Modern Applied Science 10, no. 10 (2016): 224. http://dx.doi.org/10.5539/mas.v10n10p224.

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Three-dimensional modeling is used as a new way of presenting information about the electromagnetic compatibility of telecommunications infrastructure equipment. We analyzed the problem of modeling of electromagnetic noise waves equipment and communication channels of telecommunications monitoring systems. Conducted the analysis of control problems of telecommunications equipment electromagnetic compatibility. Described the real conditions of installing the electronic equipment in computational complexes. Using tools of 3D-modeling was formed cable route, taking into account the suppression of

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Kholkina, Natalya. "INFORMATION TRANSFER EFFECTIVENESS OF WARNING AND TELECOMMUNICATION SYSTEMS OF AUDIO-EXCHANGE UNDER NOISE CONDITIONS." Bulletin of Bryansk state technical university 2020, no. 5 (2020): 49–55. http://dx.doi.org/10.30987/1999-8775-2020-5-49-55.

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In the paper shown there is presented an approach to the solution of the problem of the effectiveness parameter assessment in telecommunication systems of operational and command communication, systems of warning speakerphone and audio-exchange.  There are considered the matters of the dependence investigation of the acoustic speech signal/noise ratio to the assurance of the required syllabic legibility for the possibility to increase the function effectiveness of telecommunication systems and information exchange operated under complex noise situation. There is shown the dependence of f

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Semenko, Anatoliy, Nikolaj Kushnir, Natalia Bokla, and Yevhen Shestopal. "SYNTHESIS OF STRIP-BAND TELECOMMUNICATION SYSTEM WITH INCREASED CONFIDENTIALITY OF INFORMATION TRANSMISSION THROUGH USE OF PSSEVDOVIDOVYPOVY." Visnyk Universytetu “Ukraina”, no. 1 (28) 2020 (2020): 65–74. http://dx.doi.org/10.36994/2707-4110-2020-1-28-06.

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Currently, special attention is paid to the creation of broadband telecommunications systems with a noise-like signal. Such systems have indisputable advantages in noise immunity, in the confidentiality of information transmission, electromagnetic compatibility with neighboring electronic devices. The formation of a broadband signal in most cases is carried out by the method of direct spreading of the spectrum by manipulating the carrier frequency signal by a pulse pseudo-random sequence (PVP) –m-sequence, Gold, Kasami, Walsh sequence. Sequences such as a well-known attacker can pick up in the

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Pliushch, Oleksandr, Viktor Vyshnivskyi, Volodymyr Tolubko, et al. "Performance Study of Spread Spectrum Systems with Hard Limiters." International Journal of Computer Network and Information Security 12, no. 5 (2020): 1–15. http://dx.doi.org/10.5815/ijcnis.2020.05.01.

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Use of spread spectrum systems in telecommunications is studied. It is shown that spread spectrum techniques can substantially enhance noise and interference immunity in the currently deployed information transmission networks. Primitive polynomials are proposed to obtain respective spreading codes. A spreading code consisting of 1023 chips is synthesized and its characteristics are studied. It is deduced that powerful interferences can exceed dynamic range of the receiving part of the system and, as a result, deteriorate information transmission. To overcome this problem, utilization of limit

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Matsenko, S., O. Borysenko, S. Spolitis, and V. Bobrovs. "Noise Immunity of the Fibonacci Counter with the Fractal Decoder Device for Telecommunication Systems." Latvian Journal of Physics and Technical Sciences 56, no. 5 (2019): 12–21. http://dx.doi.org/10.2478/lpts-2019-0027.

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Abstract The paper presents the improved method of noise immune Fibonacci counting in the minimal form of representation. The method was tested and investigated in the developed noise immune pulse counter based on a minimal form of Fibonacci code with a fractal decoding device. The proposed device, which is simulated in the NI Multisim software, possesses a homogenous structure, increased noise immunity, performance and detection of bit errors in the process of its operation.

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Artyushenko, Vladimir Mikhailovich, and Tatyana Sergeevna Abbasova. "Increasing Noise Immunity of Electric Communication Channels in High-speed Telecommunication Systems." Biosciences Biotechnology Research Asia 11, Spl Edition Nov. 14 (2014): 277–79. http://dx.doi.org/10.13005/bbra/1475.

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Shefer, О., B. Topikha, V. Shefer, and S. Myhal. "SYNTHESIS OF INVENTORIES TO THE INTERFERENCE OF INFORMATION AND TELECOMMUNICATION SYSTEMS." Системи управління, навігації та зв’язку. Збірник наукових праць 6, no. 58 (2019): 115–22. http://dx.doi.org/10.26906/sunz.2019.6.115.

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The article deals with the development of analytical algorithms of information and telecommunication systems formation that are invariant to the obstacle (additiveornon-aditiveone). The basic approaches to determine the class of obstacles for which an invariant system can be constructed are discussed and analyzed in detail. It is established that the invariance property of a feedback system guarantees the given probability of receiving information, but it does not guarantee a preset speed of information transmission. Studies have shown that invariance is achieved by reducing the noise immunity

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13

Miller, S. E. "On the injection laser contribution to mode partition noise in fiber telecommunication systems." IEEE Journal of Quantum Electronics 25, no. 8 (1989): 1771–81. http://dx.doi.org/10.1109/3.34035.

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Miry, Mohammed, Ali Miry, and Hussain Khleaf. "Adaptive Noise Cancellation for speech Employing Fuzzy and Neural Network." Iraqi Journal for Electrical and Electronic Engineering 7, no. 2 (2011): 94–101. http://dx.doi.org/10.37917/ijeee.7.2.2.

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Adaptive filtering constitutes one of the core technologies in digital signal processing and finds numerous application areas in science as well as in industry. Adaptive filtering techniques are used in a wide range of applications such as noise cancellation. Noise cancellation is a common occurrence in today telecommunication systems. The LMS algorithm which is one of the most efficient criteria for determining the values of the adaptive noise cancellation coefficients are very important in communication systems, but the LMS adaptive noise cancellation suffers response degrades and slow conve

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Boiko, Juliy, Ilya Pyatin, Oleksander Eromenko, and Mykhailo Stepanov. "Method of the adaptive decoding of self-orthogonal codes in telecommunication." Indonesian Journal of Electrical Engineering and Computer Science 19, no. 3 (2020): 1287. http://dx.doi.org/10.11591/ijeecs.v19.i3.pp1287-1296.

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<p>The methodology description of the adaptive multi-threshold decoding of self-orthogonal codes in the telecommunication channels of information transfer is shown in this paper. The method of multi-threshold decoder modification is described on the basis of adaptive filtration algorithms. Principles of adaptive algorithms application provide for necessary data transmission validity in the case of the multi-threshold decoding are explored. The graphic charts of multi-threshold decoders noise immunity of self-orthogonal block and convolutional codes are presented. It is determined the cod

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Martín, Antonio J. López. "Web-Based Remote Learning of Communication Systems: A Successful Experience." International Journal of Electrical Engineering & Education 40, no. 3 (2003): 169–74. http://dx.doi.org/10.7227/ijeee.40.3.1.

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A web-based on-line framework has been created to augment an undergraduate course in communication theory aimed at Spanish telecommunication engineering students. Its aim is to enrich the students' understanding on basic topics such as analogue and digital communication systems, information theory, random signals and noise, as well as to provide remote support, additional information and interactive tools. As an ultimate goal, it tries to contribute to a redefinition of the role of the student as the principal actor of his or her own learning.

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Satar, Baris, Gokhan Soysal, Xue Jiang, Murat Efe, and Thiagalingam Kirubarajan. "Robust Weighted l1,2 Norm Filtering in Passive Radar Systems." Sensors 20, no. 11 (2020): 3270. http://dx.doi.org/10.3390/s20113270.

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Conventional methods such as matched filtering, fractional lower order statistics cross ambiguity function, and recent methods such as compressed sensing and track-before-detect are used for target detection by passive radars. Target detection using these algorithms usually assumes that the background noise is Gaussian. However, non-Gaussian impulsive noise is inherent in real world radar problems. In this paper, a new optimization based algorithm that uses weighted     l 1    and     l 2   &#

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18

Makri, R., M. Gargalakos, and N. K. Uzunoglu. "Design and Development of Monolithic Microwave Integrated Amplifiers and Coupling Circuits for Telecommunication Systems Applications." Active and Passive Electronic Components 25, no. 1 (2002): 1–22. http://dx.doi.org/10.1080/08827510211275.

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Recent advances in printed circuit and packaging technology of microwave and millimeter wave circuits result to the increasing use of MMICs in telecommunication systems. At Microwave and Fiber Optics Lab of NTUA several designs of various MMICs were conducted using the HP Eesof CAD Tool and FET and HEMT models of F20 and H40 GaAs foundry process of GEC Marconi. The designed MMICs are constructed in Europractice Organization while on-wafer probe measurements are performed in the Lab. In that framework, MMIC technologies are employed in the design of power and low noise amplifiers and couplers t

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Eng, Png Ching, Sun Song, and Bai Ping. "State-of-the-art photodetectors for optoelectronic integration at telecommunication wavelength." Nanophotonics 4, no. 3 (2015): 277–302. http://dx.doi.org/10.1515/nanoph-2015-0012.

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AbstractPhotodetectors hold a critical position in optoelectronic integrated circuits, and they convert light into electricity. Over the past decades, high-performance photodetectors (PDs) have been aggressively pursued to enable high-speed, large-bandwidth, and low-noise communication applications. Various material systems have been explored and different structures designed to improve photodetection capability as well as compatibility with CMOS circuits. In this paper, we review state-of-theart photodetection technologies in the telecommunications spectrum based on different material systems

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Lucks, Marcio Barbosa, and Heuller A. C. Procópio. "Analysis of Companding Techniques Applied to Onboard Telemetry Systems." Applied Mechanics and Materials 232 (November 2012): 915–18. http://dx.doi.org/10.4028/www.scientific.net/amm.232.915.

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In order to increase the dynamic range and the signal-to-quantization noise ratio (SQNR) of telecommunication systems, companding techniques were developed, such as the μ-law and the A-law. These techniques allow a non-uniform quantization of the signal using a compressor circuit followed by a uniform quantizer in the transmitter and the reconstruction of the original signal on the receiver by means of an expander circuit. Some types of signals monitored during the flight of sounding vehicles and satellite launchers have a very wide dynamic range. In this paper, we propose and analyze the use

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Borgosz, Jan, and Bogusław Cyganek. "Wavelet Based Method for an Analysis of Jitter in Telecommunication Signals." International Journal of Wavelets, Multiresolution and Information Processing 01, no. 03 (2003): 307–23. http://dx.doi.org/10.1142/s0219691303000207.

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This article describes a new method of the measure and analysis of the jitter phenomenon. Presented analysis is focused on the case of the telecommunication systems, but can be easily extended to other systems. This research is a continuation of the earlier work on the phase noise and jitter measurement systems. Method shown in this paper does not require generation of the reference clock in contrast to classic methods. It is rather based on the combination of the wavelet analysis and relational pattern recognition. This new approach to the jitter measurement problem gives very interesting res

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22

Gorbenko, I. D., А. А. Zamula, and V. L. Morozov. "INFORMATION SECURITY AND NOISE IMMUNITY OF TELECOMMUNICATION SYSTEMS UNDER CONDITIONS OF VARIOUS INTERNAL AND EXTERNAL IMPACTS." Telecommunications and Radio Engineering 76, no. 19 (2017): 1705–17. http://dx.doi.org/10.1615/telecomradeng.v76.i19.30.

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Kittisuwan, Pichid. "Image Denoising via Bayesian Estimation of Statistical Parameter Using Generalized Gamma Density Prior in Gaussian Noise Model." Fluctuation and Noise Letters 14, no. 02 (2015): 1550017. http://dx.doi.org/10.1142/s0219477515500170.

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The application of image processing in industry has shown remarkable success over the last decade, for example, in security and telecommunication systems. The denoising of natural image corrupted by Gaussian noise is a classical problem in image processing. So, image denoising is an indispensable step during image processing. This paper is concerned with dual-tree complex wavelet-based image denoising using Bayesian techniques. One of the cruxes of the Bayesian image denoising algorithms is to estimate the statistical parameter of the image. Here, we employ maximum a posteriori (MAP) estimatio

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Xiao, Y., and C. F. Mackenzie. "Remote Diagnosis in Dynamic Task Environments." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 40, no. 4 (1996): 218–22. http://dx.doi.org/10.1177/154193129604000416.

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Increasingly telecommunication systems have become an integral part of many professions. However, little empirical data and guidelines exist for designing telecommunication systems to facilitate decision makers in cooperative efforts in dynamic task environments. A preliminary experiment was conducted in which the subjects (all experienced in the domain concerned) were presented with video-tapes of previously recorded real-life trauma patient resuscitation. The experiment examined the subjects' ability to understand the status of the patient and resuscitation efforts shown in the video. The ex

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Emagbetere, J. O., and P. A. Kuale. "Investigation of Harmonics in Power Generating Systems." Advanced Materials Research 18-19 (June 2007): 99–106. http://dx.doi.org/10.4028/www.scientific.net/amr.18-19.99.

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This paper investigates harmonics in power systems especially harmonics produced by synchronous generators as well as those by distributed generation systems, particularly these days when private generating systems are on the increase in Nigeria. For the work done so far, we found that some generators have near square waves, and these are characterized by their odd harmonics. An investigation of the harmonic emf waves conducted shows that these generators produces harmonic alternating mmf’s and fluxes. All harmonic fluxes produce emfs which are undesirable. The effect of these harmonics result

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Ikamas, Kęstutis, Dmytro B. But, Albert Cesiul, et al. "All-Electronic Emitter-Detector Pairs for 250 GHz in Silicon." Sensors 21, no. 17 (2021): 5795. http://dx.doi.org/10.3390/s21175795.

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The spread of practical terahertz (THz) systems dedicated to the telecommunication, pharmacy, civil security, or medical markets requires the use of mainstream semiconductor technologies, such as complementary metal-oxide-semiconductor (CMOS) lines. In this paper, we discuss the operation of a CMOS-based free space all-electronic system operating near 250 GHz, exhibiting signal-to-noise ratio (SNR) with 62 dB in the direct detection regime for one Hz equivalent noise bandwidth. It combines the state-of-the-art detector based on CMOS field-effect-transistors (FET) and a harmonic voltage-control

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Hasso, Alaaldin, and Karwan Jacksi. "Effects of Rounding and Truncating Methods of Quantization Error and SQNR for Sine Signal." Journal of Applied Science and Technology Trends 1, no. 1 (2020): 08–12. http://dx.doi.org/10.38094/jastt113.

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Within the Analog to Digital Conversion (ADC), quantization noise is a duplicate of a Quantization Error (QE) which is introduced by quantization. In signal processing and telecommunication systems, the noise is non-linear and depends on the signal type. During the analog, Sine signal converts to the digital (ADC) process, the two methods are used Rounding and Truncating in-order to eliminate the error produced in the digitization process. The rounding method quantize assigns each sample of sine signal to the nearest quantization level. However, making the Truncating would have assigned each s

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Pradhan, Dipika D., and Abhilash Mandloi. "Performance Analysis of Flat Gain Wideband Raman Amplifier for S+C and C+L Band DWDM System." Advances in OptoElectronics 2018 (August 15, 2018): 1–7. http://dx.doi.org/10.1155/2018/5703805.

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Raman amplifier is an open area of research in telecommunication field. This paper discusses the performance of 64 channels of 10 Gbps WDM systems with backward multipump Raman amplifier. The main goal of this paper is the optimization of Raman amplifier to minimize its gain variation without using any gain flattening techniques. To increase the transmission capacity of DWDM system, Raman amplifier with backward multipump configuration is implemented. The optimized parameters such as pump power and frequencies are used to deliver both ground and excited state absorption for amplification in S+

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Rosenblum, Lawrence D., Jennifer A. Johnson, and Helena M. Saldaña. "Point-Light Facial Displays Enhance Comprehension of Speech in Noise." Journal of Speech, Language, and Hearing Research 39, no. 6 (1996): 1159–70. http://dx.doi.org/10.1044/jshr.3906.1159.

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Seeing a talker's face can improve the perception of speech in noise. There is little known about which characteristics of the face are useful for enhancing the degraded signal. In this study, a point-light technique was employed to help isolate the salient kinematic aspects of a visible articulating face. In this technique, fluorescent dots were arranged on the lips, teeth, tongue, cheeks, and jaw of an actor. The actor was videotaped speaking in the dark, so that when shown to observers, only the moving dots were seen. To test whether these reduced images could contribute to the perception o

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Samad, Md Abdus, Md Razu Ahmed, and Syed Zahidur Rashid. "An overview of rain attenuation research in Bangladesh." Indonesian Journal of Electrical Engineering and Computer Science 23, no. 2 (2021): 902. http://dx.doi.org/10.11591/ijeecs.v23.i2.pp902-909.

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The demands of shifting to the operating frequency of wireless telecommunication systems at new higher frequency bands increase as day by day the necessity to transfer more data volume through wireless networks. Bangladesh has launched its first satel-lite, Bangabandhu-1, with 40 communication channels in the C and Ku frequency bands. Besides, a huge volume of terrestrial microwave backbone networks suffer from fading during rain across the country. Bangladesh experiences heavy rainfall in June-July-August. The rain has a remarkable impact on deteriorating the signal-to-noise ratio at the rece

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Assaf, Mohammad Razk, and Abdel-Nasser Assimi. "Iterative Interference Cancellation for Coded Filter Bank Multicarrier Systems." International Journal of Embedded and Real-Time Communication Systems 10, no. 4 (2019): 81–93. http://dx.doi.org/10.4018/ijertcs.2019100105.

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Filter bank multicarrier is one of the candidates for future communication systems. Simple equalization methods cannot be directly applied due to the high interference from adjacent channels. In this article, the authors derive a soft-input/soft-output (SISO) equalizer based on the minimum mean square error (MMSE) criterion for the bit-interleaved coded system using a filter bank multi-carrier scheme with offset quadrature amplitude modulation (FBMC/OQAM). The authors use this SISO-MMSE equalizer in a turbo-equalization scheme for each sub-carrier. The difficulty in this implementation comes f

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Kropotov, Y. A., A. A. Belov, A. Y. Proskuryakov, and A. A. Kolpakov. "Investigation of signal models and methods for evaluating structures of processing telecommunication information exchange systems under acoustic noise conditions." Journal of Physics: Conference Series 1015 (May 2018): 022010. http://dx.doi.org/10.1088/1742-6596/1015/2/022010.

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M. El-Hageen, Hazem, Aadel M. Alatwi, and Ahmed Nabih Zaki Rashed. "Spatial optical transmitter based on on/off keying line coding modulation scheme for optimum performance of telecommunication systems." Indonesian Journal of Electrical Engineering and Computer Science 21, no. 1 (2021): 305. http://dx.doi.org/10.11591/ijeecs.v21.i1.pp305-312.

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<p><span>This study has presented a spatial optical transmitter based on on off keying line coding modulation scheme for the optimum performance of telecommunication systems. The encircled flux versus fiber core radius, the 3D graph for fiber mode versus core radius, and the signal power level in dBm versus wavelength through coarse wavelength division multiplexing with a fiber length of 20 km are presented and discussed in detail. The total power measured in W and dBm as well as the signal power amplitude level obtained through the infinite impulse response (IIR) filter based on b

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Uryvsky, Leonid, Andriy Korniienko, and Bohdan Shmigel. "ANALYSIS OF TELECOMMUNICATION CHANNEL SPECTRAL CHARACTERISTICS WITH BLOCK CODING AT A CONSTANT SPEED OF THE MESSAGE SOURCE." Information and Telecommunication Sciences, no. 1 (June 29, 2021): 55–61. http://dx.doi.org/10.20535/2411-2976.12021.55-61.

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Background. The direction of development of modern electronic communication systems tends to increase the speed of information transmission. In turn, increasing the speed requires the use of additional resources of the communication channel and tools to maintain the specified reliability of the transmission under limited conditions. But resources are not free. That is why there is a need to establish a relationship between the conditions for reliable transmission in high-speed channels and the spectral and energy parameters of the information transmission system. Objective. The purpose o

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Hamidkhani, Mehdi, Rasool Sadeghi, and Mohamadreza Karimi. "Dual-Band High Q-Factor Complementary Split-Ring Resonators Using Substrate Integrated Waveguide Method and Their Applications." Journal of Electrical and Computer Engineering 2019 (September 9, 2019): 1–11. http://dx.doi.org/10.1155/2019/6287970.

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In modern microwave telecommunication systems, especially in low phase noise oscillators, there is a need for resonators with low insertion losses and high Q-factor. More specifically, it is of high interest to design resonators with high group delay. In this paper, three novel dual-band complementary split-ring resonators (CSRRs) featuring high group delay etched on the waveguide surface by using substrate integrated waveguides are investigated and proposed. They are designed for a frequency range of 4.5–5.5 GHz. Group delay rates for the first, second, and third resonators were approximated

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Daneshvar, Milad, Naser Parhizgar, and Homayoon Oraizi. "Design and implementation of the subsystem subject to emission of multicomponent high-frequency signals to ensure its reliability." International Journal of Electrical and Computer Engineering (IJECE) 9, no. 5 (2019): 4204. http://dx.doi.org/10.11591/ijece.v9i5.pp4204-4216.

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Telecommunication systems, especially digital ones, are mostly known to be immune to noise given their extensive range of applications. This study aimed to investigate the methods and tools used for the analysis of multicomponent signals input to high-frequency digital subsystems, including the analysis of changes in its electrical behavior. This research mainly focuses on analyzing a high-frequency telecommunication subsystem, recording the results, investigating the system behavior against signals with different amplitudes and phases, detecting the received signals, and measuring the phase d

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Moazzeni, Taleb, Henry Selvaraj, and Yingtao Jiang. "A Novel Multi-Exponential Function-based Companding Technique for Uniform Signal Compression over Channels with Limited Dynamic Range." International Journal of Electronics and Telecommunications 56, no. 2 (2010): 125–28. http://dx.doi.org/10.2478/v10177-010-0016-1.

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A Novel Multi-Exponential Function-based Companding Technique for Uniform Signal Compression over Channels with Limited Dynamic Range Companding, as a variant of audio level compression, can help reduce the dynamic range of an audio signal. In analog (digital) systems, this can increase the signal-to-noise ratio (signal to quantization noise ratio) achieved during transmission. The μ-law algorithm that is primarily used in the digital telecommunication systems of North America and Japan, adapts a companding scheme that can expand small signals and compress large signals especially at the prese

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Kozel, V. M., D. A. Podvornaya, and K. A. Kovalev. "Peal factor of signals of 5G mobile service systems." Doklady BGUIR 18, no. 6 (2020): 5–10. http://dx.doi.org/10.35596/1729-7648-2020-18-6-5-10.

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This article discusses the possible formats of signals of 5G mobile communication networks (NR, IMT-2020): configurations of the number of resource blocks and frequency shifts of subcarriers. modulation schemes, organizations of the physical level, as well as the broadband signals of these networks and, as a result, the need for introducing a margin on the linearity of the transceiver’s paths to eliminate distortion or the manifestation of blocking effects when the signal interferes with third-party means. We analyze the characteristics of the dynamic range of the signals from IMT-2020 ground

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Sombrin, Jacques B. "Optimization criteria for power amplifiers." International Journal of Microwave and Wireless Technologies 3, no. 1 (2011): 35–45. http://dx.doi.org/10.1017/s1759078710000863.

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This paper describes existing and new criteria for comparison and optimization of non-linear power amplifiers such as RF or microwave transmitters. In addition to intermodulation, receiver noise, and losses in the transmission system, the proposed new criteria take into account efficiency or consumed power. This results in the global optimization of a combined signal-to-noise-plus-intermodulation ratio as a function of saturated or nominal power but also consumed or dissipated power. Saturated power is limited by available technology. Consumed power and dissipated power are some of the main co

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Muhammad, Fazal, Farman Ali, Usman Habib, Muhammad Usman, Imran Khan, and Sunghwan Kim. "Time Domain Equalization and Digital Back-Propagation Method-Based Receiver for Fiber Optic Communication Systems." International Journal of Optics 2020 (February 12, 2020): 1–13. http://dx.doi.org/10.1155/2020/3146374.

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Fiber optic communication systems (FOCSs) have attained a lot of attention by revolutionizing the telecommunication industry and offering new possibilities with the technical advancements in state-of-the-art high speed digital electronics. Advanced modulation formats make use of the phase, amplitude, and polarization of the optical signals at the same time to provide high spectral efficiency as compared with 1 bit/s/Hz for the intensity modulation direct detection system (IMDD), but are highly prone to transmission impairments. Thus, the effects that add up to the optical fiber impairments suc

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Ермолаев, Валерий, Valeriy Ermolaev, Юрий Кропотов, and Yuriy Kropotov. "MODEL PARAMETER IDENTIFICATION OF ACOUSTIC SIGNALS IN AUDIO EXCHANGE TELECOMMUNICATION SYSTEMS UNDER CONDITIONS OF INTERFERENCE AND ACOUSTIC FEEDBACK SYSTEM." Bulletin of Bryansk state technical university 2019, no. 10 (2019): 25–38. http://dx.doi.org/10.30987/article_5db95e85b8bb12.44709607.

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The paper reports the solution description for the problem of designing the models of the systems of information exchange with the acoustic feedback with the use of the methods of the linear functional-differential equation theory. With the aid of them it is ensured a stability increase in systems of operational-command loud-speaker communication and notice, and also the problem of echo decrease at the inputs of speech transforming devices is solved that conditions on quality increase of their functioning. In the paper there are presented models having a continuous consequence and taking into

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Sedunov, D. P., and A. S. Zhunusova. "Development of algorithm for receiving and decoding input signal using MTD decoder for subscriber terminals operating with low-orbit spacecraft." Omsk Scientific Bulletin, no. 175 (2021): 59–63. http://dx.doi.org/10.25206/1813-8225-2021-175-59-63.

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The relevance of the topic is determined by the need to increase the speed of data transmission in satellite telecommunication systems through the use of noise-proof coding. The speed of data transmission in a radio channel is actually determined by the level of interference present due to the fact that the radio transmission medium is a public environment and other electronic devices operate in it. The purpose of the article is to develop an algorithm for encoding and decoding the input signal using a multithreshold decoder (MTD) of rigid solutions for subscriber terminals operating with low-

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Zabala-Blanco, David, Marco Mora, Cesar A. Azurdia-Meza, and Ali Dehghan Firoozabadi. "Extreme Learning Machines to Combat Phase Noise in RoF-OFDM Schemes." Electronics 8, no. 9 (2019): 921. http://dx.doi.org/10.3390/electronics8090921.

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Radio-over-fiber (RoF) orthogonal frequency division multiplexing (OFDM) systems have been revealed as the solution to support secure, cost-effective, and high-capacity wireless access for the future telecommunication systems. Unfortunately, the bandwidth-distance product in these schemes is mainly limited by phase noise that comes from the laser linewidth, as well as the chromatic fiber dispersion. On the other hand, the single-hidden layer feedforward neural network subject to the extreme learning machine (ELM) algorithm has been widely studied in regression and classification problems for d

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BENNANI, YOUNÈS, and FABRÌCE BOSSAERT. "MODULAR CONNECTIONIST MODELLING AND CLASSIFICATION APPROACHES FOR LOCAL DIAGNOSIS IN TELECOMMUNICATION TRAFFIC MANAGEMENT." International Journal of Computational Intelligence and Applications 01, no. 01 (2001): 53–70. http://dx.doi.org/10.1142/s146902680100007x.

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In Neural Networks (NN) applications, it is common practice to train several different networks and select the best one on the basis of performance on a validation set. There is a major disadvantage of such an approach: the network with the best performance on the validation set might not be the best one on new test data. In fact, the generalization performance on the validation set has a random component that is due to the data noise. An alternative approach to this problem is to use a combination of multiple NN classifiers. It is well known that such combinations can produce better performan

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Supe, Andis, Kaspars Zakis, Lilita Gegere, et al. "Raman Assisted Fiber Optical Parametric Amplifier for S-Band Multichannel Transmission System." Fibers 9, no. 2 (2021): 9. http://dx.doi.org/10.3390/fib9020009.

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In this paper we present results from the study of optical signal amplification using Raman assisted fiber optical parametric amplifier with considerable benefits for S-band telecommunication systems where the use of widely used erbium-doped fiber amplifier is limited. We have created detailed models and performed computer simulations of combined Raman and fiber optical parametric amplification in a 16-channel 40 Gbps/channel wavelength division multiplexed transmission system. Achieved gain bandwidth, as well as transmission system parameters—signal-to-noise ratio and bit-error-ratio—were ana

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Malykhina, Galina, Dmitry Tarkhov, Viacheslav Shkodyrev, and Tatiana Lazovskaya. "Intelligent LED Certification System in Mass Production." Sensors 21, no. 8 (2021): 2891. http://dx.doi.org/10.3390/s21082891.

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It is impossible to effectively use light-emitting diodes (LEDs) in medicine and telecommunication systems without knowing their main characteristics, the most important of them being efficiency. Reliable measurement of LED efficiency holds particular significance for mass production automation. The method for measuring LED efficiency consists in comparing two cooling curves of the LED crystal obtained after exposure to short current pulses of positive and negative polarities. The measurement results are adversely affected by noise in the electrical measuring circuit. The widely used instrumen

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Giansanti, Daniele, Andrea Giordano, and Sandra Morelli. "Validation of an automatic tool for the assessment of image quality in digital tele-echocardiography." Journal of Telemedicine and Telecare 14, no. 7 (2008): 342–44. http://dx.doi.org/10.1258/jtt.2008.007004.

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We investigated a novel tool for assessing image degradation in tele-echocardiography. Different video recordings from an echocardiographic examination were transmitted using commercial videoconferencing equipment via a local area network. Different compression schemes were selected, ranging from MPEG 1 to MPEG 4, with transmission at different bit rates ranging from 1.0 to 4.5 Mbit/s. Three methods were used to compare the transmitted and received video sequences: the peak signal to noise ratio, the Double Stimulus Impairment Scale (DSIS) and the National Telecommunication and Information Adm

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Науменко, Виктория Владимировна, Галина Анатольевна Проскура, Александр Владимирович Тоцкий та Валерий Борисович Шаронов. "ИСПОЛЬЗОВАНИЕ РАЗВЕТВЛЕННОГО БИСПЕКТРАЛЬНО-ОРГАНИЗОВАННОГО КОДА В НЕСТАЦИОНАРНЫХ КАНАЛАХ СВЯЗИ С ЗАМИРАНИЯМИ". RADIOELECTRONIC AND COMPUTER SYSTEMS, № 1 (23 березня 2019): 44–57. http://dx.doi.org/10.32620/reks.2019.1.05.

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One of the main problems in modern wireless telecommunication systems and networks is the transmission and reception of signals in a multipath environment. Due to the nonideal impulse response of the communication channel, the frequency selective fading of the transmitted signal occurs. Diffraction and interference effects create a complex non-stationary structure of the electromagnetic field, which varies greatly in space and time. The method of branched BIS is organized - redundant coding, which allows you to receive and recognize a signal in a digital communication system in the presence of

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Asif, Rameez, and William J. Buchanan. "Quantum-to-the-Home: Achieving Gbits/s Secure Key Rates via Commercial Off-the-Shelf Telecommunication Equipment." Security and Communication Networks 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/7616847.

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There is current significant interest in Fiber-to-the-Home (FTTH) networks, that is, end-to-end optical connectivity. Currently, it may be limited due to the presence of last-mile copper wire connections. However, in near future, it is envisaged that FTTH connections will exist, and a key offering would be the possibility of optical encryption that can best be implemented using Quantum Key Distribution (QKD). However, it is very important that the QKD infrastructure is compatible with the already existing networks for a smooth transition and integration with the classical data traffic. In this

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Mladenovic, Vladimir, and Danijela Milosevic. "A novel-iterative simulation method for performance analysis of non-coherent FSK/ASK systems over Rice/Rayleigh channels using the wolfram language." Serbian Journal of Electrical Engineering 13, no. 2 (2016): 157–74. http://dx.doi.org/10.2298/sjee151118002m.

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In this paper, a new approach in solving and analysing the performances of the digital telecommunication non-coherent FSK/ASK system in the presence of noise is derived, by using a computer algebra system. So far, most previous solutions cannot be obtained in closed form, which can be a problem for detailed analysis of complex communication systems. In this case, there is no insight into the influence of certain parameters on the performance of the system. The analysis, modelling and design can be time-consuming. One of the main reasons is that these solutions are obtained by utilising traditi

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