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Journal articles on the topic 'Channel access methods'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

Shkitov, Andrii. "Methods of protecting uav radio channels against unauthorized Access." Management of Development of Complex Systems, no. 59 (September 27, 2024): 242–47. http://dx.doi.org/10.32347/2412-9933.2024.59.242-247.

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The adoption and widespread use of unmanned aerial vehicles (UAVs) is constantly increasing in many areas. This is due to the ability of drones to record and relay real-time video and images along with the ability to fly and carry cargo. However, when using drones, a number of problems arise, because outsiders can gain access to information transmission channels to meet their own needs. Information attacks on UAVs lead to significant consequences, including commercial and non-commercial losses. The purpose of this work is to study UAVs and their vulnerability and protection during flight. To a

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Cao, Zhan Mao, and Jian Chao Tang. "Routing Methods and Scheduling Patterns in MIMO WMN Virtual Model." Applied Mechanics and Materials 519-520 (February 2014): 216–21. http://dx.doi.org/10.4028/www.scientific.net/amm.519-520.216.

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Multi-input multi-output wireless mesh networks (MIMO WMNs) act as backbone broadband networks for ubiquitous access. Topology model is a crucial factor in interference avoidance, simplifying channel allocation, and discussing optimal scheduling and routing. Cartesian product of graphs (CPG) is introduced for MIMO WMN as a virtual topology. By putting orthogonal channels into different channel layer meshes, some conclusions are explored on channel allocation, routing and scheduling. A path coherent realization is composed of combinatorial edges over multiple channels for all hops. Some importa

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Dai, Yuan-Kao, Li-Hsing Yen, and Jia-Wei Su. "Toward an Access Infrastructure for Mobile Cloud." International Journal of Grid and High Performance Computing 5, no. 3 (2013): 6–19. http://dx.doi.org/10.4018/jghpc.2013070102.

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The provision of mobile cloud service calls for a wireless access infrastructure that offers high bandwidth to mobile users. Among all enabling technologies, wireless mesh networks (WMNs) have the advantage of low deployment cost and widely available user equipments. To provide more bandwidth, access points in WMNs are commonly equipped with multiple wireless interfaces (radios) that can operate on multiple non-overlapping channels in parallel. The objective of channel assignments in a multi-channel, multi-radio MWN is to reduce co-channel interference experienced by links so as to increase ne

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Boutalline, Mohammed, Belaid Bouikhalene, and Said Safi. "Channel Identification and Equalization based on Kernel Methods for Downlink Multicarrier-CDMA Systems." Journal of Electronic Commerce in Organizations 13, no. 2 (2015): 14–29. http://dx.doi.org/10.4018/jeco.2015040102.

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In this paper the authors are focused on channel identification and equalization for Multi-Carrier Code Division Multiple Access (MC-CDMA) system. For this, they identify the impulse response of two practical selective frequency fading channels called Broadband Radio Access Network (BRAN A and BRAN B) normalized by the European Telecommunications Standards Institute (ETSI). To identify the channel parameters, they have the positive definite kernels to build on algorithm. The simulations show that the presented method confirms the good performance for different SNR values. In part of equalizati

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Hong, Jingxiang, Jose Rodriguez-Pineiro, and Xuefeng Yin. "FDD Channel Inference Methods With Experimental Performance Evaluation." IEEE Access 8 (2020): 10491–502. http://dx.doi.org/10.1109/access.2020.2965290.

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Farhan, Ikhlas Mahmoud, Dhafer R. Zaghar, and Hadeel Nasrat Abdullah. "Enhancement of code division multiple access system performance using raptor codes." Indonesian Journal of Electrical Engineering and Computer Science 26, no. 3 (2022): 1460. http://dx.doi.org/10.11591/ijeecs.v26.i3.pp1460-1468.

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Some kinds of communication systems work in very low signal-to-noise (LSNR) environments. For these systems to function reliably, <span>specific techniques and methodologies have to be used to mitigate the degrading effects of the channel. The channel coding method is the key element in most LSNR communication systems, but emphasizing the code division multiple access (CDMA) is a new transmission technique in these channels. To enhance the CDMA scheme's system capacity and reach unprecedented ranges of LSNR values in wireless sensor network. This paper suggests combining CDMA with certai

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Farhan, Ikhlas Mahmoud, Dhafer R. Zagha, and Hadeel Nasrat Abdullah. "Enhancement of code division multiple access system performance using raptor codes." Indonesian Journal of Electrical Engineering and Computer Science 26, no. 3 (2022): 1460–68. https://doi.org/10.11591/ijeecs.v26.i3.pp1460-1468.

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Some kinds of communication systems work in very low signal-to-noise (LSNR) environments. For these systems to function reliably, specific techniques and methodologies have to be used to mitigate the degrading effects of the channel. The channel coding method is the key element in most LSNR communication systems, but emphasizing the code division multiple access (CDMA) is a new transmission technique in these channels. To enhance the CDMA scheme's system capacity and reach unprecedented ranges of LSNR values in wireless sensor network. This paper suggests combining CDMA with certain types

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Khan, Zaheer, and Janne Lehtomäki. "Adaptive and Autonomous Channel Access Methods for Distributed Cognitive Radios." Wireless Personal Communications 81, no. 2 (2014): 861–80. http://dx.doi.org/10.1007/s11277-014-2161-9.

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Khan, Zaheer, Janne Lehtomaki, Simon Scott, Zhu Han, Marwan Krunz, and Alan Marshall. "Distributed and Coordinated Spectrum Access Methods for Heterogeneous Channel Bonding." IEEE Transactions on Cognitive Communications and Networking 3, no. 3 (2017): 267–81. http://dx.doi.org/10.1109/tccn.2017.2709753.

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Zidane, Mohammed, Said Safi, Mohamed Sabri, and Ahmed Boumezzough. "Bit Error Rate Analysis of MC-CDMA Systems with Channel Identification Using Higher Order Cumulants." Indonesian Journal of Electrical Engineering and Computer Science 1, no. 1 (2016): 138. http://dx.doi.org/10.11591/ijeecs.v1.i1.pp138-152.

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The aim of this paper is to contribute to study the problems of the blind identification and equalization using Higher Order Cumulants (HOC) in downlink Multi-Carrier Code Division Multiple Access (MC-CDMA) systems. For this problem, two blind algorithms based on HOC for Broadband Radio Access Network (BRAN) channel are proposed. In the one hand, to assess the performance of these approaches to identify the parameters of non minimum phase channels, we have considered two theoretical channels, and one practical frequency selective fading channel called BRAN C, driven by non gaussian signal. In

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Gizzini, Abdul Karim, and Marwa Chafii. "Low Complex Methods for Robust Channel Estimation in Doubly Dispersive Environments." IEEE Access 10 (2022): 34321–39. http://dx.doi.org/10.1109/access.2022.3162928.

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Abbass, Waseem, Riaz Hussain, Jaroslav Frnda, Nasim Abbas, Muhammad Awais Javed, and Shahzad A. Malik. "Resource Allocation in Spectrum Access System Using Multi-Objective Optimization Methods." Sensors 22, no. 4 (2022): 1318. http://dx.doi.org/10.3390/s22041318.

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The paradigm of dynamic shared access aims to provide flexible spectrum usage. Recently, Federal Communications Commission (FCC) has proposed a new dynamic spectrum management framework for the sharing of a 3.5 GHz (3550–3700 MHz) federal band, called a citizen broadband radio service (CBRS) band, which is governed by spectrum access system (SAS). It is the responsibility of SAS to manage the set of CBRS-SAS users. The set of users are classified in three tiers: incumbent access (IA) users, primary access license (PAL) users and the general authorized access (GAA) users. In this article, dynam

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Chan, Chiu Chun, Bassel Al Homssi, and Akram Al-Hourani. "Performance Evaluation of Random Access Methods for IoT-over-Satellite." Remote Sensing 14, no. 17 (2022): 4232. http://dx.doi.org/10.3390/rs14174232.

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Low Earth orbit (LEO) satellite constellations are currently being explored to provide global and seamless coverage for IoT-over-Satellite applications. Random access techniques require low transmission overhead providing a compatible route for IoT-over-Satellite applications, however, coming at the expense of the offered quality-of-service. In this paper, we develop a realistic uplink performance framework that incorporates many practical parameters such as the satellite availability, packet collision and interference, Doppler shift, and impairments experienced in a typical Satellite-to-Groun

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Findlay, N., and GP Findlay. "Single Ion Channel Current Data from the Plasmalemma of Cytoplasmic Fragments of the Green Alga, Hydrodictyon africanum." Functional Plant Biology 22, no. 4 (1995): 571. http://dx.doi.org/10.1071/pp9950571.

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To measure, by patch clamping, electric current through ion channels in the plasmalemma of plant cells, access to the membrane surface is required. In higher plants, this access is gained by the preparation of protoplasts by enzymic methods. In plants such as the freshwater alga Hydrodictyon africanum, which have large cells, the preparation of protoplasts by enzymic methods is not possible. In this paper we describe a non-enzymic method for gaining access to the plasmalemma of Hydrodictyon. Our initial attempts to gain access to the plasmalemma of these cells by first plasmolysing the cells,

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Lai, Lianyou, Zhongzhe Song, and Weijian Xu. "A Novel Framed Slotted Aloha Medium Access Control Protocol Based on Capture Effect in Vehicular Ad Hoc Networks." Sensors 24, no. 3 (2024): 992. http://dx.doi.org/10.3390/s24030992.

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The capture effect is a frequently observed phenomenon in vehicular ad hoc networks (VANETs) communication. When conflicts arise during time slot access, failure to access does not necessarily occur; instead, successful access may still be achieved. The capture effect can enhance the likelihood of multiple access and improve communication efficiency. The security of VANETs communication is undoubtedly the primary concern. One crucial approach to enhance security involves the design of an efficient and reliable medium access control (MAC) protocol. Taking into account both aspects, we propose a

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Tomović, Slavica, and Igor Radusinović. "Dynamic spectrum access with deep Q-learning in densely occupied and partially observable environments." Telfor Journal 13, no. 1 (2021): 1–6. http://dx.doi.org/10.5937/telfor2101001t.

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In this paper, we propose a new Dynamic Spectrum Access (DSA) method for multi-channel wireless networks. We assume that DSA nodes do not have prior knowledge of the system dynamics, and have only partial observability of the channels. Thus, the problem is formulated as a Partially Observable Markov Decision Process (POMDP) with exponential time complexity. We have developed a novel Deep Reinforcement Learning (DRL) based DSA method which combines a double deep Q-learning architecture with a recurrent neural network and takes advantage of a prioritized experience buffer. The simulation analysi

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Borodin, Vyacheslav V., Valentin E. Kolesnichenko, and Vyacheslav A. Shevtsov. "Analysis of the Efficiency of Various Receipting Multiple Access Methods with Acknowledgement in IoT Networks." Inventions 8, no. 4 (2023): 105. http://dx.doi.org/10.3390/inventions8040105.

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An Internet of things (IoT) network is a distributed set of “smart” sensors, interconnected via a radio channel. The basic method of accessing the radio channels for these networks is Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA), in which access is carried out on the basis of contention, and confirmation of the correct reception of the packet is achieved using a receipt. If the sizes of information packets are small and comparable to the sizes of receipts, then the transmission of receipts requires a significant bandwidth of the channel, which reduces the efficiency of the netwo

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Aandrei, J. Jha, Kumar Tushar, Kumar Madhav, Avaneesh Sheil, and Singh Ruchi. "Dual Channel Brachial AVF- A Case Series of Six Patients." International Journal of Pharmaceutical and Clinical Research 13, no. 5 (2021): 43–48. https://doi.org/10.5281/zenodo.14212732.

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<strong>Background:</strong> Vascular access for Hemodialysis is the commonest mode of renal replacement therapy for end stage renal failure patients. Such fistulae have significant access related complications that translate to reduced durability. This paper reviews a new technique of a “dual channel” brachial arteriovenous fistula creation that provides used both basilic and cephalic veins thereby providing greater area for access and potentially reduced complications. <strong>Objectives:</strong> To study technical feasibility of creation and immediate patency of

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Carrera, Diego Fernando, Cesar Vargas-Rosales, Noe M. Yungaicela-Naula, and Leyre Azpilicueta. "Comparative Study of Artificial Neural Network Based Channel Equalization Methods for mmWave Communications." IEEE Access 9 (2021): 41678–87. http://dx.doi.org/10.1109/access.2021.3065337.

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Sun, Hui, and Han Han. "Analysis of Spectrum Selection Methods Based on Platform-Qualnet in Cognitive Radio Networks." International Journal of Online and Biomedical Engineering (iJOE) 15, no. 03 (2019): 124. http://dx.doi.org/10.3991/ijoe.v15i03.9517.

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Dynamic spectrum Access （DSA）is used to make use of the spectrum in wireless network. In most situations, control channel is a common approach to negotiation between secondary users. But, based on this feature, the attacker can destroy the communication network only influence the control center. So, in this paper, two methods without control channel are simulated in Qualent platform. The results prove that those methods are available, and the Receiver-directed channel selection is more match to the regular control channel standards in throughput.

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N. Thakre, Prasheel, Sanjay Pokle, Radhika Deshpande, Samruddhi Paraskar, Shashwat Sinha, and Yash Lalwani. "Performance analysis of NOMA in Rayleigh and Nakagami Fading channel." 3C TIC: Cuadernos de desarrollo aplicados a las TIC 11, no. 2 (2022): 183–93. http://dx.doi.org/10.17993/3ctic.2022.112.183-193.

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Cellular connectivity is expanding rapidly in the modern world. The multiple access strategy is one of the highly used methods for allocating the range of users in cellular network. Spectrum allocation is a crucial element to take into account since cellular communication is becoming more and more popular. NOMA is a channel access mechanism used in 5G mobile communication. It is also known as non-orthogonal multiple access. NOMA is a potential strategy for enhancing spectral efficiency and sum rate. Using the NOMA method, we evaluated the BER versus transmitted power of two users in rayleigh a

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Yang, Xu, Athman Bouguettaya, and Xumin Liu. "Semantic-Based Access to Composite Mobile Services." International Journal of Web Services Research 8, no. 3 (2011): 70–100. http://dx.doi.org/10.4018/jwsr.2011070104.

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In this paper, the authors propose novel access methods and a multi-channel organization for mobile users to effectively access composite M-services in wireless broadcast networks. The authors first propose a broadcast-based infrastructure to address the challenges of efficient usages of composite M-services. They then define a few semantics for accessing broadcast based M-services and discuss the strategies of efficiently accessing M-services based on the semantics. The authors also propose several channel organization that are suitable for the broadcast-based M-service structure and provide

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Xu, Yangzhou, Jia Lou, Tiantian Wang, et al. "Multiple Access for Heterogeneous Wireless Networks with Imperfect Channels Based on Deep Reinforcement Learning." Electronics 12, no. 23 (2023): 4845. http://dx.doi.org/10.3390/electronics12234845.

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In heterogeneous wireless networks, when multiple nodes need to share the same wireless channel, they face the issue of multiple access, which necessitates a Medium Access Control (MAC) protocol to coordinate the data transmission of multiple nodes on the shared communication channel. This paper presents Proximal Policy Optimization-based Multiple Access (PPOMA), a novel multiple access protocol for heterogeneous wireless networks based on the Proximal Policy Optimization (PPO) algorithm from deep reinforcement learning (DRL). Specifically, we explore a network scenario where multiple nodes em

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Musaev, Alexey, and Sergey Zinkin. "Theoretical analysis of interference in satellite communication systems when using multistation access with code division of channels." Informatization and communication 4 (November 2020): 7–12. http://dx.doi.org/10.34219/2078-8320-2020-11-4-7-12.

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Abstract. To ensure the most effective use of the limited radio resource of the repeater, various methods of multistation access of earth stations to the repeater are developed and applied, based on one or another method of channel separation. The article presents a theoretical analysis of the occurrence of mutual and combination interference in satellite communication systems when using multi -station access with code separation of channels. Recommendations for further experimental studies are proposed.

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Jayant, P. Pawar, and V. Ingole Prashant. "Hidden Markov model technique for dynamic spectrum access." TELKOMNIKA Telecommunication, Computing, Electronics and Control 18, no. 5 (2020): 2780~2786. https://doi.org/10.12928/TELKOMNIKA.v18i5.14470.

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Dynamic spectrum access is a paradigm used to access the spectrum dynamically. A hidden Markov model (HMM) is one in which you observe a sequence of emissions, but do not know the sequence of states the model went through to generate the emissions. Analysis of hidden Markov models seeks to recover the sequence of states from the observed data. In this paper, we estimate the occupancy state of channels using hidden Markov process. Using Viterbi algorithm, we generate the most likely states and compare it with the channel states. We generated two HMMs, one slowly changing and another more dynami

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Tonin, Jean Marcel Faria, and Taufik Abrao. "Linear detectors and precoding methods for massive MIMO." Semina: Ciências Exatas e Tecnológicas 42, no. 2 (2021): 209. http://dx.doi.org/10.5433/1679-0375.2021v42n2p209.

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Detection in multiple-input-multiple-output (MIMO) wireless communication systems is a crucial procedure in receivers since the multiple access transmission schemes generate interference due to the simultaneous transmission along with the several antennas, unlike single-input-single-output (SISO) transmission schemes. Precoding is a technique in MIMO systems used to mitigate the effects of the channel over the received signal. Hence, it is possible to adjust continuously the transmitted information to reverse the effect of the wireless channel at the receiver side. In this work, linear sub-opt

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Wang, Xiaoyan, Yuto Teraki, Masahiro Umehira, Hao Zhou, and Yusheng Ji. "A Usage Aware Dynamic Spectrum Access Scheme for Interweave Cognitive Radio Network by Exploiting Deep Reinforcement Learning." Sensors 22, no. 18 (2022): 6949. http://dx.doi.org/10.3390/s22186949.

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Future-generation wireless networks should accommodate surging growth in mobile data traffic and support an increasingly high density of wireless devices. Consequently, as the demand for spectrum continues to skyrocket, a severe shortage of spectrum resources for wireless networks will reach unprecedented levels of challenge in the near future. To deal with the emerging spectrum-shortage problem, dynamic spectrum access techniques have attracted a great deal of attention in both academia and industry. By exploiting the cognitive radio techniques, secondary users (SUs) are capable of accessing

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Rogozhnikov, Eugeniy, Yakov Kryukov, Dmitriy Pokamestov, Edgar Dmitriev, and Renat Abenov. "Analysis of factors affecting the operation of the communication system with nonorthogonal multiple access." ITM Web of Conferences 30 (2019): 04003. http://dx.doi.org/10.1051/itmconf/20193004003.

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NOMA is a group of non-orthogonal multiple access methods [1]. In this article, we talk about the Power Domain (Division) NOMA method. It is a non-orthogonal multiple access method with channel separation by power [2]. NOMA compaction uses controlled inter-channel interference, which is removed in the receiver when channel separation using special algorithms. PD-NOMA can be used in conjunction with various types of modulation, including OFDM.

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Subramanian, Radhika. "UNLOCKING THE POWER OF OMNI CHANNEL RETAILING: A COMPREHENSIVE ANALYSIS OF ITS BENEFITS FOR CUSTOMERS, SHOPPERS, AND ORGANIZATIONS." Shodha Prabha 48, no. 03 (2023): 190–96. https://doi.org/10.5281/zenodo.8189064.

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Omni-channel retailing has emerged as a transformative approach in the retail industry, offering seamless integration of multiple channels to deliver a unified and enhanced shopping experience. This research paper aims to provide a comprehensive analysis of the benefits of omni-channel retailing for customers, shoppers, and organizations. The study employs a mixed-methods approach, combining both qualitative and quantitative data collection methods. In-depth interviews, surveys, and case studies are utilized to gather insights from customers, shoppers, and retail organizations operating in div

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Lai, Junyu, James C. F. Li, Alireza Abdollahpouri, Jianhua Zhang, and Ming Lei. "A Fairness-Based Access Control Scheme to Optimize IPTV Fast Channel Changing." Mathematical Problems in Engineering 2014 (2014): 1–12. http://dx.doi.org/10.1155/2014/207402.

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IPTV services are typically featured with a longer channel changing delay compared to the conventional TV systems. The major contributor to this lies in the time spent on intraframe (I-frame) acquisition during channel changing. Currently, most widely adopted fast channel changing (FCC) methods rely on promptly transmitting to the client (conducting the channel changing) a retained I-frame of the targeted channel as a separate unicasting stream. However, this I-frame acceleration mechanism has an inherent scalability problem due to the explosions of channel changing requests during commercial

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Du, Chenglin, Ran Ye, Xiaolong Cai, et al. "A review on GaN HEMTs: nonlinear mechanisms and improvement methods." Journal of Semiconductors 44, no. 12 (2023): 121801. http://dx.doi.org/10.1088/1674-4926/44/12/121801.

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Abstract The GaN HEMT is a potential candidate for RF applications due to the high frequency and large power handling capability. To ensure the quality of the communication signal, linearity is a key parameter during the system design. However, the GaN HEMT usually suffers from the nonlinearity problems induced by the nonlinear parasitic capacitance, transconductance, channel transconductance etc. Among them, the transconductance reduction is the main contributor for the nonlinearity and is mostly attributed to the scattering effect, the increasing resistance of access region, the self-heating

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Li, Guoyan, Tian Li, Xinwei Yue, Tianwei Hou, and Bin Dai. "High Reliable Uplink Transmission Methods in GEO–LEO Heterogeneous Satellite Network." Applied Sciences 13, no. 15 (2023): 8611. http://dx.doi.org/10.3390/app13158611.

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As a significant component of non-terrestrial networks, satellite communication has gradually evolved into a heterogeneous topology where the network nodes are classified as low Earth orbit (LEO) and geostationary Earth orbit (GEO) nodes. Considering the advantage of low transmission delay of LEO satellites in a heterogeneous network, ground users are arranged to access LEO satellites in the first priority. By fully understanding the equivalent channel gain difference in the beam-edge and beam-center users, we develop non-orthogonal multiple access (NOMA) in an LEO network where different user

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Narasu, Krishnamoorthy Raghavan, Immanuel Rajkumar, Jerry Alexander, and Marshiana Devaerakkam. "Impact of Equalizer step size in Underwater Acoustic Communication Channel." International Journal of Computer Network and Information Security 13, no. 1 (2021): 29–38. http://dx.doi.org/10.5815/ijcnis.2021.01.03.

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The Underwater Acoustic Channel (UAC) is a time variant channel and its multipath effects create ISI. This is one of the most important obstacles in the UAC channel which reduces the transmission rate. To remove this obstacle, a proper filter has to be designed in the receiver section. In this article, optimal step size for equalizer is computed and compared the results with the known techniques namely Decision Feedback Equalizer with interleave division multiple access (DFE IDMA) and Cyclic Prefix - Orthogonal Frequency Division Multiplexing (CP-OFDM) Equalizer. Channels are modeled using ray

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Zhu, Guohun, Fangrong Zong, Hua Zhang, Bizhong Wei, and Feng Liu. "Cognitive Load During Multitasking Can Be Accurately Assessed Based on Single Channel Electroencephalography Using Graph Methods." IEEE Access 9 (2021): 33102–9. http://dx.doi.org/10.1109/access.2021.3058271.

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Zhang, Yan, Ammar Ghazal, Cheng-Xiang Wang, Hongrui Zhou, Weiming Duan, and El-Hadi M. Aggoune. "Accuracy-Complexity Tradeoff Analysis and Complexity Reduction Methods for Non-Stationary IMT-A MIMO Channel Models." IEEE Access 7 (2019): 178047–62. http://dx.doi.org/10.1109/access.2019.2957820.

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Zhu, Feng Xia, Zai Yu Zhang, and Ma Jia Wu. "Broadband Self-Organizing Network Channel Allocation." Applied Mechanics and Materials 631-632 (September 2014): 910–13. http://dx.doi.org/10.4028/www.scientific.net/amm.631-632.910.

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This paper discussed the current variety of effective multi-channel self-organizing network channel allocation techniques and proposed a combination of two access methods CSMA and TDMA. By using broadband wireless self-organizing network channel and OPNET simulation tools,the methods can build self-organizing network simulation scenarios that proposed network protocols performance analysis. This self-organizing network channel allocation can effectively transmit information and avoid the conflict of different communication node distribution of the corresponding channel.

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Бабурин, Александр Вильямович, Лариса Александровна Глущенко, Борис Николаевич Добряков, Григорий Александрович Остапенко, and Андрей Петрович Преображенский. "PROTECTION AGAINST UNAUTHORIZED ACCESS TO INFORMATION CIRCULATING IN WIRELESS INFRARED CHANNELS OF DATA TRANSMISSION." ИНФОРМАЦИЯ И БЕЗОПАСНОСТЬ, no. 4(-) (December 25, 2020): 511–18. http://dx.doi.org/10.36622/vstu.2020.23.4.003.

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Цель исследования состоит в разработке методов защиты от несанкционированного доступа информации, циркулирующей в беспроводных ИК-каналах передачи данных. Показаны возможные способы несанкционированного доступа к каналу передачи данных от ИК-клавиатуры к компьютеру. Основной способ несанкционированного доступа к ИК-каналу передачи данных - это регистрация диффузно-отраженного от элементов интерьера излучения. Проведены теоретические оценки, подтверждающие возможность получения информации, циркулирующей в беспроводных ИК-каналах передачи данных при несанкционированном доступе. Рассмотрен типичн

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Pokamestov, Dmitriy, Yakov Kryukov, Eugeniy Rogozhnikov, Georgiy Shalin, Artem Shinkevich, and Serafim Novichkov. "Adaptation of Signal with NOMA and Polar Codes to the Rayleigh Channel." Symmetry 14, no. 10 (2022): 2103. http://dx.doi.org/10.3390/sym14102103.

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Polar codes are one of the most effective methods of error correction coding. Currently, these codes are used in 5G communication systems and are the main candidate for 6G. Symmetry plays an important role in coding and decoding algorithms for polar codes. Modulation and multiple access methods are the basis for a physical layer along with error correction codes. Non-Orthogonal Multiple Access (NOMA) methods are a promising technology for future telecommunication systems. They allow the increase of both spectral efficiency and the quantity of subscribers of a communication system. In this pape

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Rahayu, Heni Sulistyawati Purwaning, Mardiana Dewi, and Muhammad Abid. "Analysis of Marketing Margins and Farmers’ Shares on Corn in Sigi Regency, Central Sulawesi, Indonesia." Caraka Tani: Journal of Sustainable Agriculture 36, no. 2 (2021): 355. http://dx.doi.org/10.20961/carakatani.v36i2.49409.

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<p>An increase in corn productivity is not always followed by an increase in farmer income and welfare. The sustainability of farms must be supported by its economic viability including the marketing aspect. This study aimed to analyze the marketing of corn in Sigi Regency, Central Sulawesi Province. This research applied qualitative and quantitative methods. Marketing channel and marketing margin were analyzed descriptively, while farmer share was analyzed quantitatively using variance analysis (ANOVA). The results have shown three types of corn marketing channels, namely: 1) channel I,

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Hussain, Syed Aamer, Norulhusna Ahmad, Ibraheem Shayea, et al. "A review of codebook design methods for sparse code multiple access." Indonesian Journal of Electrical Engineering and Computer Science 22, no. 2 (2021): 927–35. https://doi.org/10.11591/ijeecs.v22.i2.pp927-935.

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The progressions in telecommunication beyond the 5th generation have created a need to improve research drifts. The current 5G study has an important focus on non-orthogonal multiple access (NOMA) technology. Sparse code multiple access (SCMA) is a promising technique within NOMA, enhancing the multi-user handling capability of next-generation communication. In the SCMA sphere, codebook designing and optimisation are essential research matters. This study conversed with different codebook design practises existing in the literature, analysing them for numerous parameters, including bit error r

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Moreira, Darlan Cavalcante, Lászlon R. Costa, Yuri C. B. Silva, and Igor M. Guerreiro. "Interference Mitigation for Dynamic TDD Networks Employing Sounding Signals." Journal of Communication and Information Systems 35 (2020): 320–32. https://doi.org/10.14209/jcis.2020.32.

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The requirements of fifth-generation (5G) mobile communications include services with low delay and high throughput. Network densification is pointed to as a promising method to increase the network capacity. However, this solution brings new problems, such as the fast variation in traffic demands among access nodes (ANs) and between uplink and downlink, leading to high delays. To solve the traffic issues in dense networks, dynamic time division duplex (DTDD) is pointed as a possible solution. This strategy creates a new kind of interference between ANs and user equipments (UEs) called cross-i

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Huda, Anwar, A. Alabdel Abass Ahmed, and Kadhim Rawaa. "Performance of Relaying System with NOMA over Symmetric a-Stable Noise Channels." Indian Journal of Science and Technology 17, no. 17 (2024): 1745–54. https://doi.org/10.17485/IJST/v17i17.432.

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Abstract <strong>Objectives:</strong> This paper investigates the performance of a candidate 5G transmission system technique that is Non-Orthogonal Multiple Access (NOMA) over α-stable channels. This type of channel gets more attention in the research community because of its ability to model new IoT scenarios. However, there is a research gap in applying this type of channel to different wireless communications scenarios. In this work, we envision a scenario where users employ NOMA communications in the presence of an obstacle. As our mathematical analysis and simulation results s

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Matveev, Nikolay, and Andrey Turlikov. "Review of random multiple access methods for massive machine type communication." Information and Control Systems, no. 6 (January 16, 2020): 54–67. http://dx.doi.org/10.31799/1684-8853-2019-6-54-67.

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Introduction: Intensive research is currently underway in the field of data transmission systems for the Internet of Things in relation to various scenarios of Massive Machine Type Communication. The presence of a large number of devices in such systems necessitates the use the methods of random multiple access to a common communication channel. It is proposed in some works to increase the channel utilization efficiency by the use of error correction coding methods for conflict resolution (Coded Random Access). The vast variety of options for using such communication systems has made it imposs

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Zhou, Kaijie, and Navid Nikaein. "Random access with adaptive packet aggregation in LTE/LTE-A." EURASIP Journal on Wireless Communications and Networking 2016, no. 1 (2016): 36. https://doi.org/10.1186/s13638-016-0531-6.

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While random access presents a promising solution for efficient uplink channel access, the preamble collision rate can significantly increase when massive number of devices simultaneously access the channel. To address this issue and improve the reliability of the random access, an adaptive packet aggregation method is proposed. With the proposed method, a device does not trigger a random access for every single packet. Instead, it starts a random access when the number of aggregated packets reaches a given threshold. This method reduces the packet collision rate at the expense of an extra lat

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Anwar, Huda, Ahmed A. Alabdel Abass, and Rawaa Kadhim. "Performance of Relaying System with NOMA over Symmetric a-Stable Noise Channels." Indian Journal Of Science And Technology 17, no. 17 (2024): 1745–54. http://dx.doi.org/10.17485/ijst/v17i17.432.

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Objectives: This paper investigates the performance of a candidate 5G transmission system technique that is Non-Orthogonal Multiple Access (NOMA) over α-stable channels. This type of channel gets more attention in the research community because of its ability to model new IoT scenarios. However, there is a research gap in applying this type of channel to different wireless communications scenarios. In this work, we envision a scenario where users employ NOMA communications in the presence of an obstacle. As our mathematical analysis and simulation results show, there is a significant differenc

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46

Hussain, Syed Aamer, Norulhusna Ahmad, Ibraheem Shayea, et al. "A review of codebook design methods for sparse code multiple access." Indonesian Journal of Electrical Engineering and Computer Science 22, no. 2 (2021): 927. http://dx.doi.org/10.11591/ijeecs.v22.i2.pp927-935.

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<span lang="EN-GB">The progressions in telecommunication beyond the 5<sup>th</sup> generation have created a need to improve research drifts. The current 5G study has an important focus on non-orthogonal multiple access (NOMA) technology. sparse code multiple access (SCMA) is a promising technique within NOMA, enhancing the multi-user handling capability of next-generation communication. In the SCMA sphere, codebook designing and optimisation are essential research matters. This study conversed with different codebook design practises existing in the literature, analysing the

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Pokamestov, Dmitriy, Yakov Kryukov, Eugeniy Rogozhnikov, Islam Kanatbekuli, and Edgar Dmitriyev. "SCMA-MIMO system with adaptation to the channel state." Journal of Physics: Conference Series 2134, no. 1 (2021): 012025. http://dx.doi.org/10.1088/1742-6596/2134/1/012025.

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Abstract Sparse code multiple access (SCMA) is one of the promising implementations of non-orthogonal multiple access (NOMA) methods. SCMA provides high spectral efficiency and a large number of network resources. We describe a communication system with SCMA, space-time block coding (STBC), multiple input multiple output (MIMO) technology, and orthogonal frequency division multiplexing (OFDM). The architecture of such systems, including algorithms of formation and processing of signals is considered. A method for adapting signals to the state of the spatial channel transmission based on inform

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van Dijk, Wout M., Jana R. Cox, Jasper R. F. W. Leuven, et al. "The vulnerability of tidal flats and multi-channel estuaries to dredging and disposal." Anthropocene Coasts 4, no. 1 (2021): 36–60. http://dx.doi.org/10.1139/anc-2020-0006.

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Shipping fairways in estuaries are continuously dredged to maintain access for large vessels to major ports. However, several estuaries worldwide show adverse side effects to dredging activities, in particular affecting morphology and ecologically valuable habitats. We used physical scale experiments, field assessments of the Western Scheldt estuary (the Netherlands), and morphodynamic model runs to analyse the effects of dredging and future stresses (climate and sediment management) on a multi-channel system and its ecologically valuable intertidal flats. All methods indicate that dredging an

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Mykhalevskiy, D. V. "TECHNICAL DIAGNOSIS OF WIRELESS CHANNELS OF 802.11 STANDARD." Proceedings of the O.S. Popov ОNAT 1, no. 2 (2020): 111–20. http://dx.doi.org/10.33243/2518-7139-2020-1-2-111-120.

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The main task when designing 802.11 wireless networks is to create access with the highest possible channel bandwidth for an individual subscriber. This problem is solved in two ways: calculation and test diagnostics of networks at the design stage; optimization of networks during operation based on technical diagnostics and monitoring. This paper investigates and clarifies the existing terminology for technical diagnostics and control for 802.11 wireless channels. As a result, it is established that radio monitoring is the first stage of technical diagnostics on the basis of which it is possi

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Min, Moonsik, Jae-Ik Kong, and Tae-Kyoung Kim. "Non-Orthogonal Multiple Access with One-Bit Analog-to-Digital Converters Using Threshold Adaptation." Sensors 23, no. 13 (2023): 6004. http://dx.doi.org/10.3390/s23136004.

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In digital communication systems featuring high-resolution analog-to-digital converters (ADCs), the utilization of successive interference cancellation and detection can enhance the capacity of a Gaussian multiple access channel (MAC) by combining signals from multiple transmitters in a non-orthogonal manner. Conversely, in systems employing one-bit ADCs, it is exceedingly difficult to eliminate non-orthogonal interference using digital signal processing due to the considerable distortion present in the received signal when employing such ADCs. As a result, the Gaussian MAC does not yield sign

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