Relevant bibliographies by topics / Time Division Multiple Access (TDMA)

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  2. Dissertations / Theses
  3. Books
  4. Book chapters
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Academic literature on the topic 'Time Division Multiple Access (TDMA)'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 September 2023

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Journal articles on the topic "Time Division Multiple Access (TDMA)"

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Yan, Zhongjiang, Qianqian Li, Bo Li, and Mao Yang. "A Link Distance Division Based Time Division Multiple Access Protocol for Directional Aeronautical Relay Networks." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 38, no. 1 (February 2020): 147–54. http://dx.doi.org/10.1051/jnwpu/20203810147.

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In directional aeronautical relay networks, the airplane relay explores the advantages of the directional antenna, in terms of long transmission distance, low transmission power, small interference range and so on, to help the ground nodes transmitting data. However, data transmission delay extension problem occurs when the distance of the transmission link extends, where the wireless signal transmission time approximates the data transmission time such that the wireless signal transmission time cannot be omitted. To address the data transmission delay extension problem, a link distance division based time division multiple access protocol, LDD-TDMA, is proposed in this paper. Different from the traditional TDMA protocol, where the time slots are equal and are determined by the longest transmission link, the length of the time slots are different and are determined by different transmission links. Furthermore, the concept of communication coverage ring is proposed where the nodes located in the same ring communicate with the relay utilizing the same time slot length. The relationships between the number of rings, the ring radius and the transmission range of the LDD-TDMA are modelled and derived as a closed formula, where the ring radius are optimized such that the gain is maximized. Simulation results show that LDD-TDMA outperforms TDMA by 13.37% when the transmission range is 200 km and the ring number is 4.
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Rom, Raphael, and Moshe Sidi. "Message Delay Distribution in Generalized Time Division Multiple Access (TDMA)." Probability in the Engineering and Informational Sciences 4, no. 2 (April 1990): 187–202. http://dx.doi.org/10.1017/s0269964800001546.

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In the classical TDMA, which has been the subject of extensive research in the past, a single slot is allocated to each and every user within every frame. In many situations this leads to an inefficient utilization of the channel calling for a nonhomogeneous allocation of slots. This paper focuses on a generalized TDMA scheme in which users are allocated more than a single slot per frame, not necessarily contiguous. We derive the delay distribution and buffer occupancy for such a scheme as well as the expected values of these quantities.
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Gupta, Ashi. "Faster and Efficient Time Division Multiple Access (TDMA) System." International Journal of Advanced Research in Computer Science and Software Engineering 8, no. 3 (March 30, 2018): 11. http://dx.doi.org/10.23956/ijarcsse.v8i3.586.

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In this paper the author has developed a new design to implement the TDMA(Time division multiple access) system. It is a verilog code that is simulated on the “Mentor graphics MODEL SIM- ALTERA 10.1d(QUARTUS II 13.0) “ software. It allows several users to share the same frequency channel by dividing the signal into different time slots. It takes requests from the users, processes them and provide grants to the users one by one according to the priority set, in one clock cycle per grant better than the previous design which takes more than 2 cycles to process 1 request.
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Elmissaoui, Taoufik. "Time Division Multiple Access for Remote Lab (TDMA-RL)." International Journal of Online and Biomedical Engineering (iJOE) 18, no. 07 (June 14, 2022): 4–13. http://dx.doi.org/10.3991/ijoe.v18i07.29773.

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The new technologies development has enabled us to build a remote lab system for multiple disciplines. The remote lab system becomes an essential for eLearning system. Multiple solution has been provided in the literature for building remote laboratory. All existing and commercialized system do not provide the multiusers process at the same time. In fact, each student must make a reservation before using the remote lab. In this paper, we have proposed and tested a new method that enable multi student to have the benefits of the remote laboratory at the same time. Our solution is based on the Time Division Multiple Access for Remote Lab (TDMA-RL). Each student can use the laboratory equipment at a fixed slot time. Our application can manage the frame send for each learner. The remotely learner can not feel the existing of the other persons due to the equipment speed and the good management time of application. The number of users varies the equipment lab characteristics.
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Akizuki, Osamu, Shingo Suzuki, Shinjirou Ooshita, and Kouichi Mutsuura. "Time division multiple access with parallel transmission: TDMA/PT." Electronics and Communications in Japan (Part I: Communications) 80, no. 5 (May 1997): 1–10. http://dx.doi.org/10.1002/(sici)1520-6424(199705)80:5<1::aid-ecja1>3.0.co;2-p.

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Miriampally, Venkata Raghavendra, G. Subba Rao, and V. Sudheer Raja. "Determination of Number of Channels in Multiple Access Techniques for Wireless Communications." International Journal of Informatics and Communication Technology (IJ-ICT) 4, no. 1 (April 1, 2015): 1. http://dx.doi.org/10.11591/ijict.v4i1.pp1-6.

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<p>In wireless communications system, it is desirable to allow the subscriber to send simultaneously information to the base station while receiving information from base station. Multiple access techniques are used to allow many mobile users to share simultaneously a finite amount of radio spectrum. Frequency division multiple access (FDMA), time division multiple access(TDMA), and code division multiple access (CDMA) are the three major access techniques used to share the available bandwidth in a wireless communication system. In this paper we calculated the number of channels required for FDMA &amp; TDMA techniques depending on various factors such as spectrum, channel band width etc.</p>
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Yun, Changho, and Yong-Kon Lim. "GSR-TDMA: A Geometric Spatial Reuse-Time Division Multiple Access MAC Protocol for Multihop Underwater Acoustic Sensor Networks." Journal of Sensors 2016 (2016): 1–14. http://dx.doi.org/10.1155/2016/6024610.

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The nonnegligible propagation delay of acoustic signals causes spatiotemporal uncertainty that occasionally enables simultaneous, collision-free packet transmission among underwater nodes (UNs). These transmissions can be handled by efficiently managing the channel access of the UNs in the data-link layer. To this end, Geometric Spatial Reuse-TDMA (GSR-TDMA), a new TDMA-based MAC protocol, is designed for use in centralized, multihop underwater acoustic sensor networks (UASNs), and in this case all UNs are periodically scheduled after determining a geometric map according to the information on their location. The scheduling strategy increases the number of UNs that send packets coincidentally via two subscheduling configurations (i.e., interhop and intrahop scheduling). Extensive simulations are used to investigate the reception success rate (RSR) and the multihop delay (MHD) of GSR-TDMA, and the results are compared to those of previous approaches, including C-MAC and HSR-TDMA. GSR-TDMA outperforms C-MAC; the RSR of GSR-TDMA is 15% higher than that of C-MAC, and the MHD of GSR-TDMA is 30% lower than that of C-MAC at the most. In addition, GSR-TDMA provides even better performance improvements over HSR-TDMA; the RSR of GSR-TDMA is 50% higher than that of HSR-TDMA, and the MHD of GSR-TDMA is an order of102lower than that of HSR-TDMA at the most.
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Li, Fuyou, Feng He, Zhen Dong, Manqing Wu, and Yongsheng Zhang. "General Signal Model for Multiple-Input Multiple-Output GMTI Radar." Sensors 18, no. 8 (August 6, 2018): 2576. http://dx.doi.org/10.3390/s18082576.

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Multiple-input multiple-output (MIMO) ground moving target indication (GMTI) radar has been studied recently because of its excellent performance. In this paper, a general signal model is established for the MIMO GMTI radar with both fast-time and slow-time waveforms. The general signal model can be used to evaluate the performance of the MIMO GMTI radar with arbitrary waveforms such as the ideal orthogonal, code division multiple access (CDMA), frequency-division multiple access (FDMA), time division multiple access (TDMA), and Doppler division multiple access (DDMA) waveforms. We proposed a range-compensation method to eliminate the range-dependence of the FDMA waveforms. The simulation results indicate that the improved performance of FDMA waveforms is achieved utilizing the range-compensation method.
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Saravanan, M., Rajeev Sukumaran, M. R. Christhuraj, and T. T. Manikandan. "Stochastic Network Calculus Model for Delay Distribution of Time Division Multiple Access and Carrier Sense Multiple Access in Underwater Acoustic Wireless Communication." Revista Gestão Inovação e Tecnologias 11, no. 4 (July 22, 2021): 2885–901. http://dx.doi.org/10.47059/revistageintec.v11i4.2325.

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Underwater Acoustic wireless communication becomes a popular research area for transmitting and receiving data between the communicators in the ocean environment. High accuracy in data communication can be succeeded by proficient modeling of carrier sense multiple access and time division access. For such innovations, the system has to proceed with an appropriate framework to make constant data traffic and limitations on start to finish data traffic delays. There are two major wireless communication multiple access methods that can be utilized in real-time underwater networks. One of the multiple access schemes is TDMA and another one is CSMA/CA. This paper concentrated on the modeling of TDMA and CSMA/CA also proposes the comparison of delay (end-end) of both multiple access protocols. The results using SNC to obtain delay bounds and are associated with simulation. The results show TDMA has a lesser efficiency than CSMA/CA in the acoustic environment.
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Nguyen, VanDung, Tran Anh Khoa, Thant Zin Oo, Nguyen H. Tran, Choong Seon Hong, and Eui-Nam Huh. "Time Slot Utilization for Efficient Multi-Channel MAC Protocol in VANETs." Sensors 18, no. 9 (September 10, 2018): 3028. http://dx.doi.org/10.3390/s18093028.

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In vehicular ad hoc networks (VANETs), many schemes for a multi-channel media access control (MAC) protocol have been proposed to adapt to dynamically changing vehicle traffic conditions and deliver both safety and non-safety packets. One such scheme is to employ both time-division multiple access (TDMA) and carrier-sense multiple access (CSMA) schemes (called a hybrid TDMA/CSMA scheme) in the control channel (CCH) interval. The scheme can adjust the length of the TDMA period depending on traffic conditions. In this paper, we propose a modified packet transmitted in the TDMA period to reduce transmission overhead under a hybrid TDMA/CSMA multi-channel MAC protocol. Simulation results show that a MAC protocol with a modified packet supports an efficient packet delivery ratio of control packets in the CCH. In addition, we analyze the hybrid TDMA/CSMA multi-channel MAC protocol with the modified packet under saturated throughput conditions on the service channels (SCHs). The analysis results show that the number of neighbors has little effect on the establishment of the number of time slots in TDMA periods and on SCHs under saturated throughput conditions.
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Dissertations / Theses on the topic "Time Division Multiple Access (TDMA)"

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Kane, Roma. "Multiuser TDMA channel estimation." Diss., Columbia, Mo. : University of Missouri-Columbia, 2004. http://hdl.handle.net/10355/5810.

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Thesis (M.S.)--University of Missouri-Columbia, 2004.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (June 30, 2006) Vita. Includes bibliographical references.
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Ren, Tiegeng. "Graph coloring algorithms for TDMA scheduling in wireless sensor networks /." View online ; access limited to URI, 2007. http://0-digitalcommons.uri.edu.helin.uri.edu/dissertations/AAI3298376.

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Joung, Jinsoup. "Cochannel interference canceling receivers for TDMA systems." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/21806.

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Eiselt, Jonas, and Danial Mahmoud. "Indoor positioning system using ultrasound combined with multilateration." Thesis, Malmö universitet, Fakulteten för teknik och samhälle (TS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-20729.

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Under det senaste decenniet har inomhuspositionering fått en ökad popularitet och stått i fokus för forskning och utveckling, eftersom det ger praktiska möjligheter till att spåra och navigera objekt och människor i inomhusmiljöer. Det finns ingen global lösning för inomhuspositionering baserat på en enstaka teknologi såsom det gör för utomhuspositionering med sin satellitbaserade globala positioneringssystem. Många inomhusteknologier står inför många utmaningar såsom låg positioneringsnoggrannhet samt dyr och stor hårdvara. Den här uppsatsen beskriver hur en simpel och kostnadseffektiv lösning, som addresserar problemen med noggrannheten och hårdvarukostnaden, genom en iterativ forskningsmetod, utvecklades. Vår lösning är ett ultraljudsbaserat passivt sändare-mottagare system som kombinerar multilateration som positioneringsteknik och tidsskillnad av ankomst (TDOA) som mätprincip för att beräkna en 3D-position inuti en 4x2x2 m testyta med en övergripande noggrannhet på 16 cm inom ett 95% konfidensintervall. Vi registrerade noggranna TDOA-värden med en komparatorkrets som fungerade som en amplitud-trigger. Det här tillvägagångssättet var mycket enklare än vad andra relaterade arbeten använde sig av, vilket var sampling för att bearbeta inkommande signaler från sändarna.
During the past decade, indoor positioning has gained more popularity and has become a focus of research and development as it provides practical possibilities to track and navigate objects and people in indoor environments. There is no overall solution for indoor positioning based on a single technology like the solution for outdoor positioning with its satellite-based global positioning system. Many indoor positioning technologies today face many challenges such as low positioning accuracy, expensive and large hardware. This thesis describes how a simple and cost-effective solution, that addresses the problem of accuracy and space cost with regards to hardware being used, was developed through an iterative research methodology. Our solution is an ultrasound-based passive receiver-transmitter system that combines multilateration as a positioning technique and time difference of arrival (TDOA) as a measuring principle. This combination is used to calculate a 3D position within a 4x2x2 m test area with an overall accuracy of 16 cm within a 95% confidence interval. We registered accurate TDOA values with a comparator circuit that acts as an amplitude trigger. This approach was much more simple than that of other related works which used sampling to process incoming signals from the transmitters.
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Louis, Lee Winnie. "Flexible-schedule-based TDMA protocols for supporting fault-tolerance, on-demand TDMA slot transfer, and peer-to-peer communication in wireless sensor networks." University of Western Australia. School of Computer Science and Software Engineering, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0028.

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[Truncated abstract] This thesis develops a scheduled protocol (time division multiple access, TDMA) called flexible-schedule-based TDMA Protocol (FlexiTP), to address the problem of providing end-to-end guarantees on data delivery, whilst also respecting severe resource constraints of wireless sensor networks. FlexiTP achieves this balance through a distributed, synchronised, and loose slot structure in which sensor nodes can build, modify, or extend their schedules based on their local information. In FlexiTP, it is not necessary to predetermine the number of slots required for a network. FlexiTP's local repair scheme allows nodes to adjust their schedules dynamically and autonomously to recover from node and communication faults. Hence, it maintains a reliable and selforganising multihop network. Most sensor network protocols designed for data gathering applications implicitly assume a periodic rate of data collection from all nodes in the network to the base station. However, nodes may want to report their data more rapidly or slowly depending on the significance and importance of their data to the end-user. The problem is that traditional TDMA-based protocols are not flexible to changes in traffic patterns because of their rigid slot structure schemes. This thesis aims to solve this problem by developing an ondemand TDMA slot transfer method that leverages the flexible-slot structure algorithm of FlexiTP to transfer time slots from one part of the network to another part. ... While these communication patterns are sufficient for monitoring applications, individual sensor nodes may need to send their data to multiple destination nodes across the network in order to execute a distributed cooperative-function based on their local environment. This peer-to-peer communication pattern makes sensor networks more reactive to triggers from the environment. This thesis attempts to solve the problem of lack of peer-to-peer communication in the design of a TDMA-driven protocol by extending the idea of on-demand TDMA slot transfer method to allow each sensor node in the network to claim extra time slots to communicate with any other nodes (peers) in the network, without going through the base station. Nodes in the network may have different priorities of data because of event-triggering sensor readings or various types of sensor readings (e.g., light, temperature, and humidity) they provide. When nodes with high priority packets increase the frequency of their data collections, the network bandwidth may be dominated by these nodes. It is desirable to allow nodes with low priority packets to aggregate their packets and so enabling these nodes to send their data to the base station under the current available network bandwidth. This thesis proposes an on-demand data aggregation algorithm that enables sensor nodes to perform an in-network-aggregation based on their current sensing requirements and network capacity constraints. In summary, this thesis describes the design, implementation, and evaluation of protocols for wireless sensor networks that focus on achieving energy-efficiency, provisioning performance assurances, and supporting reactivity and adaptability in constantly changing environment.
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Filho, Antonio Francisco Gomes Furtado. "Estudo do desempenho do Multiplexador/Demultiplexador add/dropbaseado na configuraÃÃo do InterferÃmetro de Michelson de fibras Ãpticas para aplicaÃÃes em sistemas OTDMA e OCDMA." Universidade Federal do CearÃ, 2012. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=7784.

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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico
CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior
Neste trabalho, alÃm dos capÃtulos que envolvem a teoria e definiÃÃes, foi basicamente divido em trÃs estudos: Primeiro (capÃtulo 4), apresentamos uma investigaÃÃo numÃrica do desempenho de um filtro passa-banda totalmente Ãptico composto por um acoplador direcional duplo seguido de duas grades de Bragg simetricamente iguais gravadas nos seus braÃos de saÃda. Esta configuraÃÃo caracteriza um InterferÃmetro de Michelson com caracterÃsticas de um filtro add/drop. As caracterÃsticas de transmissÃo (T), taxa de extinÃÃo (XR) e âcrosstalkâ (XT) foram estudadas a partir da aplicaÃÃo de um sinal CW (onda contÃnua) na entrada do dispositivo. A teoria de modos acoplados e o mÃtodo de Runge Kutta de 4a ordem foram aplicados, respectivamente para resolver as equaÃÃes diferenciais acopladas. Este à o primeiro estudo feito considerando a nÃo linearidade do acoplador e a linearidade das grades de Bragg. O dispositivo apresenta um comportamento altamente nÃo-linear em funÃÃo do defasamento entre as amplitudes dos feixes refletidos e em funÃÃo da potÃncia de entrada. Num segundo momento (capÃtulo 5) apresentamos a propagaÃÃo e chaveamento de pulsos ultracurto (~2ps) usando um interferÃmetro de Michelson de Fibras Ãpticas. Neste estudo o desempenho do interferÃmetro à estudado como uma funÃÃo das caracterÃsticas nÃo lineares do acoplador e das grades de Bragg. Os estudos numÃricos foram feitos a partir das equaÃÃes de modos acoplados resolvidas usando o mÃtodo de Runge-Kutta de 4 ordem. As caracterÃsticas de chaveamento do pulso foram analisadas em funÃÃo da potÃncia de entrada e do defasamento aplicado em uma das grades de Bragg. As caracterÃsticas de transmissÃo (T), coeficiente de ExtinÃÃo (XR), âcrosstalkâ (XT), fator de compressÃo (FC). Utilizamos trÃs valores de potÃncia de entrada: abaixo da potÃncia critica (P0=1W), igual a potÃncia crÃtica (P0=1,73W) e acima da potÃncia crÃtica (P0=1,95W). AtravÃs deste estudo, pode-se verificar que a transmissÃo, taxa de extinÃÃo, âcrosstalkâ e fator de compressÃo dependem da potÃncia da bombeio inserida no dispositivo e da defasagem aplicada. O interferÃmetro de Michelson em fibras implementa componente de grande importÃncia para aplicaÃÃes em redes Ãpticas, como os demultiplexadores add/drop. Este dispositivo tem atraÃdo bastante interesse no campo das telecomunicaÃÃes devido a sua alta capacidade de taxas de transmissÃo. Num terceiro momento foi apresentado um estudo de simulaÃÃo numÃrica do desempenho da codificaÃÃo e decodificaÃÃo de pulsos Ãpticos curtos (ps) em sistemas OCDMA (Optical Code Division Multiple Access â acesso VIII mÃltiplo por divisÃo de cÃdigo no domÃnio Ãptico) baseado em FBG (Fiber Bragg Grating â grade de Bragg em fibra Ãptica) onde os cÃdigos sÃo inseridos atravÃs de saltos discretos na fase Ãptica (Âπ). Para geraÃÃo de pulsos codificados foram utilizados cÃdigos de Gold obtidos analiticamente. Analisamos como a inserÃÃo de cÃdigos adicionais afetam a autocorrelaÃÃo e correlaÃÃo cruzada. O interferÃmetro de Michelson inicialmente estudado no capÃtulo 4 foi utilizado para propagaÃÃo e chaveamento de sinais codificados. Baseados nas caracterÃsticas de TransmissÃo (T) e Taxa de extinÃÃo (XR) fizemos um estudo do dispositivo como multiplexador /demultiplexador add/drop na recuperaÃÃo de pulsos codificados.
This work, in addition the chapters which involves both theory and definitions, was basically divided three studies: First (chapter 4),we present a numerical investigation of the performance of a bandpass filter composed of an all-optical directional coupler, followed by two double bars Bragg recorded symmetrically equal outputs in their arms. This configuration features a Michelson interferometer with characteristics of an add/ drop filter. The transmission characteristics (T), extinction rate (XR) and "crosstalk" (XT) were studied based on the application of a CW signal (continuous wave) into the device. Theory of coupled modes and the Runge Kutta fourth order were applied respectively to solve the coupled differential equations. This is the first study considering the nonlinearity of the coupler and the linearity of Bragg gratings. The device features a highly nonlinear behavior as a function of dephasing between the amplitudes of the reflected beams and depending on the input power. In a second step (section 5), the propagation and switching of ultrashort pulse (~ 2PS) Michelson interferometer using an optical fiber. In this study the performance of the interferometer is studied as a function of the nonlinear characteristics of the coupler and Bragg gratings. The numerical studies were made from the coupled mode equations solved using the Runge-Kutta 4th order. The pulse switching characteristics were analyzed as a function of input power and applied to one dephasing Bragg gratings. The transmission characteristics (T), extinction coefficient (XR), "crosstalk" (XT), the compression factor (CF)and shape of the pulses were analyzed for different values of phase and different input powers. We use three values of input power: below the critical power (1W = P0), equal to the critical power (P0 = 1.73W) and above the critical power (P0 = 1.95W). Through this study, it is found that the transmission rate of extinction, "crosstalk" and compression factor depends on the power of the pump device inserted into the gap and applied The Michelson interferometer fiber implement major component with applications in optical networks, such as demultiplexers add/drop. This device has attracted considerable interest in the field of telecommunications due to its ability of high transmission rates. In the third place was presented a numerical simulation study of the performance of encoding and decoding of short optical pulses (ps) systems OCDMA (Optical Code Division Multiple Access based on FBG (Fiber Bragg Grating ) where codes are inserted through discrete jumps in the optical phase (Â π). For generation of coded pulses were used Gold codes obtained analytically. We look at how the inclusion of additional codes affect the autocorrelation and cross correlation.The Michelson interferometer initially studied Chapters 4 was used for propagation and switching of encrypted signals. Based on the characteristics of transmission (T) and extinction rate (XR) did a study of the device as multiplexer/demultiplexer add / drop in the recovery of coded pulses.
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Santos, Frederico Miguel do Céu Marques dos. "Architecture for real-time coordination of multiple autonomous mobile units." Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/13969.

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Doutoramento em Engenharia Electrotécnica
Interest on using teams of mobile robots has been growing, due to their potential to cooperate for diverse purposes, such as rescue, de-mining, surveillance or even games such as robotic soccer. These applications require a real-time middleware and wireless communication protocol that can support an efficient and timely fusion of the perception data from different robots as well as the development of coordinated behaviours. Coordinating several autonomous robots towards achieving a common goal is currently a topic of high interest, which can be found in many application domains. Despite these different application domains, the technical problem of building an infrastructure to support the integration of the distributed perception and subsequent coordinated action is similar. This problem becomes tougher with stronger system dynamics, e.g., when the robots move faster or interact with fast objects, leading to tighter real-time constraints. This thesis work addressed computing architectures and wireless communication protocols to support efficient information sharing and coordination strategies taking into account the real-time nature of robot activities. The thesis makes two main claims. Firstly, we claim that despite the use of a wireless communication protocol that includes arbitration mechanisms, the self-organization of the team communications in a dynamic round that also accounts for variable team membership, effectively reduces collisions within the team, independently of its current composition, significantly improving the quality of the communications. We will validate this claim in terms of packet losses and communication latency. We show how such self-organization of the communications can be achieved in an efficient way with the Reconfigurable and Adaptive TDMA protocol. Secondly, we claim that the development of distributed perception, cooperation and coordinated action for teams of mobile robots can be simplified by using a shared memory middleware that replicates in each cooperating robot all necessary remote data, the Real-Time Database (RTDB) middleware. These remote data copies, which are updated in the background by the selforganizing communications protocol, are extended with age information automatically computed by the middleware and are locally accessible through fast primitives. We validate our claim showing a parsimonious use of the communication medium, improved timing information with respect to the shared data and the simplicity of use and effectiveness of the proposed middleware shown in several use cases, reinforced with a reasonable impact in the Middle Size League of RoboCup.
O interesse na utilização de equipas multi-robô tem vindo a crescer, devido ao seu potencial para cooperarem na resolução de vários problemas, tais como salvamento, desminagem, vigilância e até futebol robótico. Estas aplicações requerem uma infraestrutura de comunicação sem fios, em tempo real, suportando a fusão eficiente e atempada dos dados sensoriais de diferentes robôs bem como o desenvolvimento de comportamentos coordenados. A coordenação de vários robôs autónomos com vista a um dado objectivo é actualmente um tópico que suscita grande interesse, e que pode ser encontrado em muitos domínios de aplicação. Apesar das diferenças entre domínios de aplicação, o problema técnico de construir uma infraestrutura para suportar a integração da percepção distribuída e das acções coordenadas é similar. O problema torna-se mais difícil à medida que o dinamismo dos robôs se acentua, por exemplo, no caso de se moverem mais rápido, ou de interagirem com objectos que se movimentam rapidamente, dando origem a restrições de tempo-real mais apertadas. Este trabalho centrou-se no desenvolvimento de arquitecturas computacionais e protocolos de comunicação sem fios para suporte à partilha de informação e à realização de acções coordenadas, levando em consideração as restrições de tempo-real. A tese apresenta duas afirmações principais. Em primeiro lugar, apesar do uso de um protocolo de comunicação sem fios que inclui mecanismos de arbitragem, a auto-organização das comunicações reduz as colisões na equipa, independentemente da sua composição em cada momento. Esta afirmação é validada em termos de perda de pacotes e latência da comunicação. Mostra-se também como a auto-organização das comunicações pode ser atingida através da utilização de um protocolo TDMA reconfigurável e adaptável sem sincronização de relógio. A segunda afirmação propõe a utilização de um sistema de memória partilhada, com replicação nos diferentes robôs, para suportar o desenvolvimento de mecanismos de percepção distribuída, fusão sensorial, cooperação e coordenação numa equipa de robôs. O sistema concreto que foi desenvolvido é designado como Base de Dados de Tempo Real (RTDB). Os dados remotos, que são actualizados de forma transparente pelo sistema de comunicações auto-organizado, são estendidos com a respectiva idade e são disponibilizados localmente a cada robô através de primitivas de acesso eficientes. A RTDB facilita a utilização parcimoniosa da rede e bem como a manutenção de informação temporal rigorosa. A simplicidade da integração da RTDB para diferentes aplicações permitiu a sua efectiva utilização em diferentes projectos, nomeadamente no âmbito do RoboCup.
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Duff, Kevin Craig. "Network-layer reservation TDM for ad-hoc 802.11 networks." Thesis, Rhodes University, 2008. http://eprints.ru.ac.za/1146/.

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Chen, An. "Buffer-efficient RTA algorithms in optical TDM networks /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?ECED%202007%20CHENA.

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Kaba, James, and Barbara Connolly. "Overview of the Telemetry Network System (TMNS) RF Data Link Layer." International Foundation for Telemetering, 2012. http://hdl.handle.net/10150/581604.

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ITC/USA 2012 Conference Proceedings / The Forty-Eighth Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2012 / Town and Country Resort & Convention Center, San Diego, California
As the integrated Network Enhanced Telemetry (iNET) program prepares for developmental flights tests, refinements are being made to the Radio Access Network Standard that ensures interoperability of networked radio components. One key aspect of this interoperability is the definition of Telemetry Network System (TmNS) RF Data Link Layer functionality for conducting efficient communications between radios in a TDMA (Time Division Multiple Access) channel sharing scheme. This paper examines the overall structure of the TmNS RF Data Link Layer and provides an overview of its operation. Specific topics include Medium Access Control (MAC) scheduling and framing in the context of a burst-oriented TDMA structure, link layer encryption, the priority-enabled Automatic Repeat reQuest (ARQ) protocol, high-level network packet and link control message encapsulation, payload segmentation and reassembly, and radio Link Layer Control Messaging.
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Books on the topic "Time Division Multiple Access (TDMA)"

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G, Glisic Savo, and Leppänen Pentti A, eds. Wireless communications: TDMA versus CDMA. Boston: Kluwer Academic Publishers, 1997.

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Coursey, Cameron. Understanding digital PCS: The TDMA standard. Boston: Artech House, 1999.

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Adrian, Smith, and Jacobs Charles A, eds. IS-136 TDMA technology, economics, and services. Boston: Artech House, 1998.

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Glisic, Savo G. Wireless Communications: TDMA versus CDMA. Boston, MA: Springer US, 1997.

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Omar, Hassan Aboubakr, and Weihua Zhuang. Time Division Multiple Access For Vehicular Communications. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09504-2.

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Ivancic, William D. Satellite-matrix-switched, time-division-multiple-access network simulator. Cleveland, Ohio: Lewis Research Center, 1989.

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D, Ivancic William, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., eds. Satellite-matrix-switched, time-division-multiple-access network simulator. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1989.

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D, Ivancic William, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., eds. Satellite-matrix-switched, time-division-multiple-access network simulator. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1989.

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Nagy, Lawrence A. Satellite range delay simulator for a matrix-switched time division multiple-access network simulator. [Washington, D.C.]: NASA, 1990.

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United States. National Aeronautics and Space Administration., ed. Satellite range delay simulator for a matrix-switched time division multiple-access network simulator. [Washington, D.C.]: NASA, 1990.

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Book chapters on the topic "Time Division Multiple Access (TDMA)"

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Faruque, Saleh. "Time Division Multiple Access (TDMA)." In Radio Frequency Multiple Access Techniques Made Easy, 35–43. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-91651-4_4.

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Gagliardi, Robert M. "Time-Division Multiple Access." In Satellite Communications, 251–88. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-010-9760-4_6.

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Weik, Martin H. "time-division multiple access." In Computer Science and Communications Dictionary, 1787. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_19627.

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Chan, Tom S. "Time-Division Multiple Access." In Handbook of Computer Networks, 769–78. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118256114.ch49.

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Weik, Martin H. "switched time-division multiple access." In Computer Science and Communications Dictionary, 1699. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_18687.

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Riliskis, Laurynas, Jan Berdajs, Evgeny Osipov, and Andrej Brodnik. "Reality Considerations When Designing a TDMA-FDMA Based Link-Layer for Real-Time WSN." In Multiple Access Communications, 93–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-34976-8_11.

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Weik, Martin H. "satellite switched time-division multiple access." In Computer Science and Communications Dictionary, 1515. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_16601.

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Khorov, Evgeny, Anton Kiryanov, Alexander Krotov, Pierluigi Gallo, Domenico Garlisi, and Ilenia Tinnirello. "Joint Usage of Dynamic Sensitivity Control and Time Division Multiple Access in Dense 802.11ax Networks." In Multiple Access Communications, 57–71. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-51376-8_5.

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Burkard, Rainer E. "Time Division Multiple Access Systems and Matrix Decomposition." In Proceedings of the Fourth European Conference on Mathematics in Industry, 35–46. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-009-0703-4_3.

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Omar, Hassan Aboubakr, and Weihua Zhuang. "Introduction." In Time Division Multiple Access For Vehicular Communications, 1–7. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09504-2_1.

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Conference papers on the topic "Time Division Multiple Access (TDMA)"

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Dunlop, J. "Performance assessment of the advanced time division multiple access system by simulation." In IEE Colloquium on Advanced TDMA Techniques and Applications. IEE, 1996. http://dx.doi.org/10.1049/ic:19961232.

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Yazdani, Navid. "Multi-Frequency Time-Division multiple-access (MF-TDMA) resource packing." In MILCOM 2008 - 2008 IEEE Military Communications Conference (MILCOM). IEEE, 2008. http://dx.doi.org/10.1109/milcom.2008.4753482.

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Abumarshoud, Hanaa, and Harald Haas. "Index Time Division Multiple Access (I-TDMA) for LiFi Systems." In 2019 IEEE 89th Vehicular Technology Conference (VTC2019-Spring). IEEE, 2019. http://dx.doi.org/10.1109/vtcspring.2019.8746663.

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Burrowes, Gunilla E., Jason Brown, and Jamil Y. Khan. "Adaptive Space Time - Time Division Multiple Access (AST-TDMA) protocol for an underwater swarm of AUV's." In 2013 MTS/IEEE OCEANS. IEEE, 2013. http://dx.doi.org/10.1109/oceans-bergen.2013.6608031.

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Brown, T. J., Hamed S. Al-Raweshidy, Stewart D. Cusworth, and John M. Senior. "Delay-throughput and bit-error-rate analysis for the transmission of telephony across a passive optical network using a time division multiple access/code division multiple access (TDMA/CDMA) hybrid scheme." In Advanced Networks and Services, edited by Robert A. Cryan, P. Nalinaj Fernando, Pierpaolo Ghiggino, and John M. Senior. SPIE, 1995. http://dx.doi.org/10.1117/12.201305.

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Qiu, Xing-Zhi, Z. W. Yu, Xiaohua Wang, C. Botte, Jan Vandewege, Karel De Meyer, and Willy Trog. "Smart 155.52 Mb/s burst-mode transceiver with embedded intelligence for time division multiple access (TDMA) passive optical network (PON) applications." In Advanced Networks and Services, edited by S. Iraj Najafi and Henri Porte. SPIE, 1995. http://dx.doi.org/10.1117/12.201960.

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Chiriac, Victor Adrian, Tien-Yu Tom Lee, and David Lutz. "System and Package Level Thermal Optimization of Power Amplifier Modules With Application in Wireless Communication." In ASME 2003 International Electronic Packaging Technical Conference and Exhibition. ASMEDC, 2003. http://dx.doi.org/10.1115/ipack2003-35216.

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Increased functionality of microelectronic packages for commercial applications leads to the necessity of identifying packaging solutions with high standards for thermal performance, during its functioning lifetime as well as during various test conditions. A detailed numerical analysis examines the thermal characteristics of a power amplifier module for time division multiple access (TDMA), using commercially available software. The increasing trend in power levels and densities leads to the need of design thermal optimization, either at module level or system level. Under specific test conditions, the thermal performance of the module degrades gradually; therefore, alternative test designs are investigated for thermal performance optimization. Initial study focuses on assessing the thermal performance of a baseline design. The peak temperature reaches 144°C, about 60°C temperature increase over the reference temperature. The peak temperature value is below the limit of 150°C. Further investigation focuses on several systems level designs, by incorporating individual test contactors between the DUT and load board or with conductive elastomers or pedestal solid ground slug for thermal performance enhancement. The peak temperatures are calculated in this case for the system being exposed to the ambient at 85°C. The results indicate that the test design with solid ground slug provides the best thermal performance, ∼ 5% better than the other designs. The small difference between the first two designs (with individual contactors and separate solid ground slug with conductive elastomer) resides in the fact that the elastomer has a small thickness (0.25mm), thus a low thermal resistance (based on thermal conductivity greater than 1W/mK), with minimal impact on the overall thermal performance of the TDMA under current test conditions. The temperature difference between the top section of the contactor designs with the CBC pin/copper block/pedestal is small; in spite of this, the high temperature reached by the individual CBC pins induces possible failures in the elastomer. The designs with pedestal and solid ground slugs have a notable advantage over the design with individual contactors, due to no moving parts within the elastomer, being more robust. The peak temperature reached by the module under the best/worst testing scenarios varies by ∼ 4–5%.
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Chiriac, Victor Adrian, and Tien-Yu Tom Lee. "Thermal Assessment of a Power Amplifier Module in Wireless Handsets." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39179.

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Increased functionality of microelectronic packages for commercial applications leads to the necessity of identifying packaging solutions with high standards for thermal performance. A detailed numerical analysis examines the thermal characteristics of a power amplifier module for time division multiple access (TDMA), using commercially available software. The increasing trend in power levels and densities leads to the need of design thermal optimization, either at the module level or at the system (module board stack-up) level. Several designs are investigated for thermal performance and the best thermal design is identified. Initial study focuses on assessing the thermal performance of a baseline design. The peak temperature reaches 144°C, about 60°C temperature increase over the reference temperature. The peak temperature value is slightly below the limit of 150°C, and is calculated based on the optimal (temperature constant) heat sink scenario attached to the bottom face of the module. Several alternatives are investigated, by modifying the thermal via array structure and Cu plating thickness. The increase in copper plating from 0.025 mm to 0.05 mm (1 to 2 mils) has the largest impact on module’s thermal performance. The addition of solder material and radio board increases by almost 50% the overall thermal resistance, hence the estimated peak temperatures reached by the heat stages would exceed the limit. A detailed sensitivity study was completed to assess the importance of each element in the module-board stack-up. Finally, a comprehensive experimental study was completed to validate the numerical simulation. The results indicate that the error between measurements and simulation range between 5–8%.
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Monastero, Michael J., Stephen Weiss, Francois Pretorius, and Sheldon Burke. "SEPTA PTC Communications Systems." In 2012 Joint Rail Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/jrc2012-74041.

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The Southeastern Pennsylvania Transportation Authority (SEPTA), the 6th largest transit system in the U.S. by passenger miles travelled, is among the nation’s commuter rail agencies in the process of implementing Positive Train Control (PTC) that must be completed by the Federal mandate deadline of December, 2015. SEPTA will be implementing ACSES (Advanced Civil Speed Enforcement System), originally introduced on Amtrak on portions of the Northeast Corridor (NEC), as an overlay system applied upon a base of Automatic Train Control (ATC) cab signaling. Every SEPTA train travels on Amtrak territory as a “tenant” at some time during its daily run, and consequently ACSES is required for interoperable PTC operation on Amtrak. The application of ACSES on SEPTA territory will be complemented by a simultaneous upgrading of existing and new ATC on SEPTA. Among the many decisions faced by the SEPTA PTC design team, the PTC communications systems design has proven to be challenging. The communications systems include digital radios, communications managers, ground based networks, office systems, network management and network security. Some elements have been designed from the ground up, with few commercial “off the shelf” components available to meet the design requirements. Moreover, SEPTA had limited 220 MHz spectrum available for a PTC radio network in a relatively compact geographic area of dense commuter rail traffic. The radio network and communications managers, in particular, are breaking new ground for U.S. commuter rail operations with adoption of Time Division Multiple Access (TDMA) digital packet radios operating in the 220 MHz spectrum, under the control of communications managers. This paper will present an overview of SEPTA’s PTC communications systems, and focus upon the design process, subsequent field testing, and the rationale behind key decisions reached by the design team, that led to the selection of the technologies and network topologies that will be utilized in meeting the implementation of PTC at SEPTA.
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Zhang, Zhongping, Franz Seifert, and Robert Weigel. "Time code division multiple access: a multiple access technology for indoor wireless communications." In Advanced Networks and Services, edited by Robert A. Cryan, P. Nalinaj Fernando, Pierpaolo Ghiggino, and John M. Senior. SPIE, 1995. http://dx.doi.org/10.1117/12.201315.

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Reports on the topic "Time Division Multiple Access (TDMA)"

1

Islam, Mohammed N. 100 GB/S Time Division Multiplex (TDM) Access Nodes and Regenerators Based on Novel Loop Mirrors with High Nonlinearity Fibers. Fort Belvoir, VA: Defense Technical Information Center, July 2002. http://dx.doi.org/10.21236/ada408945.

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СИСТЕМА ОЦЕНКИ ЭНЕРГОЭФЕКТИВНОСТИ СИНХРОНИЗИРОВАННОГО ДОСТУПА В ИМИТАЦИОННОЙ МОДЕЛИ БЕСПРОВОДНОЙ СЕНСОРНОЙ СЕТИ. С. В. Капустин, Р. Ф. Халабия, April 2020. http://dx.doi.org/10.33236/2307-910x-2020-1-29-35-39.

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В статье исследуются энергоэффективность узлов в структуре имитационной модели синхронизированного доступа беспроводной сенсорной сети, приводятся обоснования и доказательства применения имитационного моделирования на основе метода Time Division Multiple Access (TDMA), для оценки надежности используется алгоритм определения пути f узла к базовой станции в нижней границе оценки стабильности. Основной задачей исследуемого синхронизированного доступа канального уровня является настройка временных параметров протокола. Предложенная имитационная модель исправляет дефекты спецификации сети и производит оценку объема в момент передачи и за единицу времени на раннем этапе настройки архитектуры сети. Основное преимущество имитационной модели заключается в высокой энергоэффективности беспроводных сенсорных узлов при развертывании беспроводной сенсорной сети.
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