Дисертації з теми "IEEE802.11.4"
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Skládaný, Vojtěch. "Technologie IEEE802.15.4, ZigBee a příklady jejích aplikací." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217678.
Повний текст джерелаHameed, Mohsin. "Performance Investigation of IEEE802 : 11e for Industrial Wireless Network." Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-4250.
Повний текст джерелаThe advantages of using IEEE 802.11-based Wireless Local Area Networks (WLAN) in industrial automation applications are substantial and include: mobility, ease and speed of installation, flexibility and costs. But wireless applications for industrial automation applications have rigorous requirements on quality of service (QoS) for the transmission of real-time critical process data. IEEE 802.11-based WLANs, which were initially designed only for best effort traffic, did not provide any QoS support for this kind of traffic. Therefore the IEEE 802.11e standard amendment was introduced and ratified in 2005. It defines the concept of a Hybrid Co-ordination Function (HCF) at the MAC layer for medium access control. HCF is a combination of HCF Controlled Channel Access (HCCA) with parameterized quality of service (QoS) and Enhanced Channel Access (EDCA) with prioritized QoS.
The contemporary work deals with the performance evaluation of HCCA for industrial wireless network. A HCCA simulation model has been implemented using OPNET modeler. The simulation results are compared with EDCA in terms of delays for various scenarios.
Heyi, Binyam Shiferaw. "Implementation of Indoor Positioning using IEEE802.15.4a (UWB)." Thesis, KTH, Kommunikationsnät, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-117920.
Повний текст джерелаLiu, Zuo. "Supporting VoIP in IEEE802.11 distributed WLANs." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/supporting-voip-in-ieee80211-distributed-wlans(1a6225c3-770e-4ce1-8fbb-b1e3f05534d2).html.
Повний текст джерелаOlsson, Mattias. "A Rapid Prototype of an IEEE802.11a Synchronizer." Thesis, Linköping University, Department of Electrical Engineering, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1457.
Повний текст джерелаThe first part of the thesis consists of a theoretical overview of OFDM, the effects of different imperfections like carrier frequency offset, timing offset and phase noise followed by a short overview of the IEEE802.11a standard for WLAN. The second part consists of an overview of a number of different techniques for synchronization that have been published. A technique based on correlation in the time domain is chosen and implemented as a floaing-point model and later as a fixed-point model using Matlab, Simulink and Xilinx System Generator. The fixed-point model is then synthesized to an FPGA to verify that the design flow works and that a required clock frequency can be achieved.
Bergamo, Pierpaolo, Daniela Maniezzo, Kung Yao, Matteo Cesana, Giovanni Pau, Mario Gerla, and Don Whiteman. "IEEE802.11 WIRELESS NETWORK UNDER AGGRESSIVE MOBILITY SCENARIOS." International Foundation for Telemetering, 2003. http://hdl.handle.net/10150/605385.
Повний текст джерелаWireless LAN (WLAN) has been extensively deployed in commercial, scientific and home applications due to the availability of low-cost wireless Network lnterace Cards (NICs) based on the IEEE802.11 standard. The purpose of this work is to study experimentally the behavior of an IEEE802.11 wireless network when the nodes arc characterized by mobility up to the speed of 240 km/h. This study leads to the understanding of the survivability and the performance of a connection under various aggressive mobility conditions. These studies may be adapted for data telemetry from mobile airborne nodes to fixed networks or between airborne nodes.
Edbom, Emil, and Henrik Henriksson. "Design comparison between HiperLAN/2 and IEEE802.11a services." Thesis, Linköping University, Department of Science and Technology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1358.
Повний текст джерелаThis paper is a study and comparison between the two Wireless LAN (WLAN) standards HiperLAN/2 and IEEE 802.11a. WLANs are used instead or together with ordinary LANs to increase mobility in for example an office. HiperLAN/2 is an European standard developed by ETSI and the IEEEs standard is American.
A WLAN-card consists roughly of a Medium Access Control (MAC), Physichal layer (PHY) and an antenna. The antenna is the same for the different standards.
Both standards operates at 5.4 GHz with a maximum transmission rate at 54 Mbit/s and they use OFDM to modulate the signal. This means that the physical layer in the two standards is similar.
The differences between the standards are in the Medium Access Control (MAC) layer. HiperLAN/2 has a much more complex MAC since it is developed with the starting point in cellular phones. Therefore this MAC is not very similar to ETHERNET that is the protocol used by regular network. On the other hand it is built to be compatible with cellular phones and other applications.
The 802.11a MAC is very much the same as in the 802.11b standard that is the most used standard at present. The difference is that 802.11a can send at much higher data rates. This MAC is build with starting point in ETHERNET so it has a similar interface to the computer. This makes it less complex.
The different MACs can provide different services. The greatest difference is that 802.11a can use a distributed send mode where any STA can send if the medium is idle. This reminds a lot of ETHERNET but they use different methods to sense if the medium is idle. In HiperLAN/2 are all transmissions scheduled by the AP. 802.11a can operate in a similar way but at the moment this mode is not as fully developed as in HiperLAN/2. There are working groups in IEEE that works toward an improvement of 802.11a so it can use queues with different priorities, this is already implemented in HiperLAN/2.
Another important issue in wireless environment is security. Both standards use encryption to protect their messages. The difference is that HiperLAN/2 changes their encryption key for every connection where 802.11a uses the same key the whole time. This gives HiperLAN/2 a better security with todays standard but thereare working groups dealing with implementing key-exchange functions and Kerberos use in 802.11a. Chapter 8 is a description of a program that we developed in C++. The program is used to monitor the different registers and ports a WLAN-card use. It is written for a 802.11b card and should be used together with Windows 2000. The source code can be found in appendix C.
Adebomehin, Akeem A. "Ultrawideband IEEE802.15.4a cognitive localization methods for the 5G environment." Thesis, University of Essex, 2017. http://repository.essex.ac.uk/20006/.
Повний текст джерелаShrestha, Sanjeeb. "Addressing the hidden terminal problem in MU-MIMO WLANs with relaxed zero-forcing approach." Thesis, Optimal ZF precoding vector, 2017. http://hdl.handle.net/10453/116766.
Повний текст джерелаAn ever-increasing data rate demand, mainly due to the proliferation of numerous smart devices, enterprises’ mission critical networks, and industry automation, has mounted tremendous pressure on today’s Wireless Local Area Networks (WLANs). Several avenues such as bandwidth, constellation density, the Multiple Input Multiple Output (MIMO) technique, etc., have been explored, e.g., IEEE802.11n/ac standards, to keep up with the demand. Future WLAN standard, e.g., IEEE802.11ax, with potential technologies such as uplink Multi-User (MU)-MIMO, full duplex transmission, etc., is anticipated by 2019. Having said that, there has been a strong emphasis on solving the technical issues with WLANs along with the addition of new frontiers in order to cope with the data rate demanded. One such appending decade-long issue is the inevitable Hidden Terminal (HT) problem in a distributive, decentralised and densely deployed WLANs, which fundamentally arises because of the transmission time overlaps between different transmitters operating at a particular frequency. The consequence is that it causes collisions of signals, which sharply reduces the system throughput. In the context of MU-MIMO based WLANs, several designs for a general network scenario, without the consideration of the HT problem, have been proposed, bringing efficiency by avoiding the collision of signals. However, a dedicated design, which could effectively address the HT problem in MU-MIMO WLANs and also become interoperable (with legacy standards) and feasible with existing hardware, is lacking to the best of our knowledge. In this thesis, we propose a solution for the HT problem which has three fundamental attributes. First, a) at the Physical (PHY) layer, the Zero-forcing (ZF) transmission strategy with fairness and throughput aware precoding is proposed, b) a hybrid scheduling scheme, combining the packet position-based First In First Out (FIFO) and channel quality-based scheme, namely the Best of the Two Choices, is designed, c) at the Medium Access Control (MAC) layer, Degrees-of-Freedom (DoF) based Transmission Opportunity (TXOP) for Access Points (APs) is developed which is backed by an extended Point Coordination Function (PCF), d) an explicit channel acquisition framework is proposed for ZF which has a reduced signaling time overhead of 98.6740 μs compared to IEEE802.11ac. e) performance evaluation methodologies are: i) hardware testbed results of the PHY strategy, which shows a received SNR gain of about 6 dB on average, and about 10 dB in comparison to the HT scenario, ii) simulation results of the MAC design, which shows a constant throughput gain of 4 − 5 times w.r.t. the popular Request to Send/Clear to Send (RTS/CTS) solution. Second, to address the interoperability issue, we purposefully use the standard frame format except for some required logical changes. Notably, the transition mechanism of our design, and for any MAC that uses standard frame formats, is investigated meticulously. The transition condition, transition steps and transition frame formats are detailed. Third, to address a practical constraint of an imperfect Channel State Information (CSI) at APs, a) we incorporate the Finite Rate Feedback (FRF) model in our solution. The effects on system parameters such as quantisation error bounds, throughput loss w.r.t. perfect CSI, etc., are discussed with closed-form analytical expressions, b) instead of an ideal ZF technique, a Relaxed ZF (RZF) framework is considered, in which the interference and power constraints of the optimisation problem are relaxed to the interference upper bound and to the maximum transmit power respectively. Our results lead to a distributive algorithm for calculating the optimal ZF precoding vector which suits the distributive, decentralised and uncoordinated nature of MU-MIMO WLANs.
Yousef, Michael Mousa. "Modellering i SIMULINK av synkronisering i nätverk enligt IEEE802.11a." Thesis, Linköping University, Department of Electrical Engineering, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5220.
Повний текст джерелаInom detta examensarbete implementeras i SIMULINK en modell av ett trådlöst överföringssystem enligt IEEE802.11a standarden. Modellen klarar av att hantera störningskällor som är vanligt förekommande i den miljö applikationen operar på. Denna modell utvärderas sedan för att avgöra dess belastningsförmåga och vid vilka värden den brister.
Första delen av rapporten beskriver målsättningen och syftet med detta examensarbete, samt metodvalet och rapportens uppläggning som tillämpats.
Rapportens andra del innehåller en allmän beskrivning av digital radiokommunikation och OFDM-baserade system. Därefter beskrivs teorin av både sändaren och mottagaren enligt IEEE802.11a standarden. Slutligen behandlas ett flertal vanligt förekommande synkroniseringsalgoritmer som har blivit publicerade.
I rapportens tredje del diskuteras de verktyg som har använts för att bygga modellen. Denna del fortsätter sedan med att kort beskriva valen av de algoritmer som har tillämpats i modellen.
Fjärde och sista delen av rapporten delas in i två kapitel. I första kapitlet sker de simuleringar som erfordras för att kunna utvärdera modellen. Examensarbetet knyts sedan ihop vid resultatkapitlet, där även förslag på fortsatt arbete diskuteras.
En ny version av examensarbetet har lagts till i listan (nr. 2) på begäran av författaren med anledning av att författaren har bytt namn.
Vyčítal, Jaroslav. "Šíření signálů bezdrátových komunikačních systémů IEEE 802.11." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377156.
Повний текст джерелаBiazotto, Luiz Henrique. "Consumo de energia e qualidade do servi?o em redes IEEE802.11." Pontif?cia Universidade Cat?lica de Campinas, 2012. http://tede.bibliotecadigital.puc-campinas.edu.br:8080/jspui/handle/tede/523.
Повний текст джерелаNowadays, the growth of energy consumption is a global concern due to the possibility of having lack of primary sources. Specially, the consume of electrical energy associated with communications network also eached significantly levels. In this context, researches related to energy efficiency are extremely important.Therefore, this work aims to evaluate the consumption of electrical energy related to IEEE802.11 networks, searching for the relation between this consumption and different parameters of QoS.
Atualmente, o crescimento do consumo de energia el?trica se constitui em preocupa??o mundial, devido ? possibilidade de escassez das fontes prim?rias. Em especial, o consumo de energia el?trica associado ?s redes de comunica??o tamb?m atingiu n?veis significativos. Nesse contexto, pesquisas associadas ? ?rea de efici?ncia energ?tica s?o de fundamental import?ncia. Assim, este trabalho teve por objetivo avaliar o consumo de energia el?trica associado a redes IEEE802.11, investigando a rela??o dessa grandeza com diferentes par?metros de Qualidade de Servi?o (QoS).
Ribeiro, Bruno Jorge Ferreira. "Um sistema distribuído para a automação de espaços residencias e de serviços." Doctoral thesis, Universidade da Beira Interior, 2008. http://hdl.handle.net/10400.6/681.
Повний текст джерелаNarisetti, Mary. "Implementation of Vertical Handoff Algorithm between IEEE802.11 WLAN and CDMA Cellular Network." Digital Archive @ GSU, 2006. http://digitalarchive.gsu.edu/cs_theses/24.
Повний текст джерелаKasch, William T., Jack L. Burbank, Julia Andrusenko, and Mark H. Lauss. "Performance of the IEEE 802.11b WLAN Standards for Fast-Moving Platforms." International Foundation for Telemetering, 2003. http://hdl.handle.net/10150/605384.
Повний текст джерелаThis paper addresses the physical and MAC layer performance of the IEEE 802.11b wireless local area networking (WLAN) standard in range-extended outdoor applications for high speed network platforms. Physical layer performance is quantified by bit error rate (BER) and packet error rate (PER) vs. range performance as well as acquisition and tracking performance considering Doppler effects caused by such high-speed platforms. This performance assessment is ascertained through the use of modeling and simulation and hardware-in-the-loop testing.
Martynek, Tomáš. "Implementace bezkotevní lokalizační techniky do simulačního prostředí ns2." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218279.
Повний текст джерелаPavlata, Karel. "Propojení sítí IEEE 802.15.4 a Ethernet." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219232.
Повний текст джерелаCouto, Paula Cristina da Silva. "Redes de área local sem fios: estudo e desenvolvimento da subcamada MAC IEEE802.11." Master's thesis, Universidade de Aveiro, 1996. http://hdl.handle.net/10773/17779.
Повний текст джерелаO trabalho desenvolvido enquadra-se no domínio científico das redes de área local sem fios. Esta dissertação descreve a especificação, implementação e teste da subcamada MAC da rede de área local sem fios definida pela especificação IEEE802.11. Introdutoriamente são apresentados os diferentes tipos de rede de área local sem fios e é feita uma breve comparação entre as duas tecnologias de suporte (radio fiequência e int?avermelhos). São também mencionados os principais organismos que desenvolvem actividades de normalização para este tipo de redes. O protocolo de acesso ao meio é uma das funcionalidades implementadas pela subcamada MAC. Os principais protocolos de acesso ao meio para redes de comunicação de área local são descritos e é feita uma análise qualitativa da aplicabilidade destes em redes de área local sem fios. Concluí-se que um protocolo híbrido, integrando acesso aleatório e não aleatório, está melhor adaptado às características do canal de transmissão e à diversidade de padrões de tráfego. A especificação IEEE802.11 define um protocolo híbrido para a subcamada MAC. Antecedendo a descrição detalhada das fases de desenvolvimento da subcamada MAC é feita uma apresentação da especificação IEEE802.11. São descritas as funções de coordenação do acesso ao meio (distribuída e centralizada), a função de fragmentação e as funções de gestão (sincronismo temporal, conservação do consumo de potência, associação e reassociação). O desenvolvimento da subcamada MAC comporta duas componentes: hardware e software. A componente hardware, baseada no processador RISC ARMóO, não foi desenvolvida no âmbito desta dissertação. Apenas é dada uma visão geral dos principais blocos funcionais que a constituem. A descrição detalhada do desenvolvimento da componente sofbvare inclui as três fases por que este passou: especificação, implementação e teste. A primeira fase incide sobre a função de coordenação do acesso ao meio distribuída (CSWCA) e funções de gestão da especificação IEEE802.11. As duas fases seguintes apenas consideram a função de coordenação do acesso ao meio. A especificação decorreu em duas etapas: na primeira construíram-se os diagramas de transição de estados utilizando a sintaxe da linguagem SDL; na segunda traduziram-se os diagramas para uma linguagem estruturada próxima da linguagem de programação Pascal (pseudo-código). A implementação consistiu na codificação em linguagem C da função de coordenação do acesso ao meio distribuída, especificada na fase anterior. O código foi optimizado no sentido de minimizar o tempo de processamento. Na fase de teste realizaram-se testes funcionais ao nível dos procedimentos e ao nível do protocolo com uma e duas estações, tendo por objectivo a detecção de qualquer erro de lógica na especificação. Todos os testes foram realizados com sucesso permitindo a validação da especificação inicial.
Hajjar, Charbel el. "Synchronization algorithms for OFDM systems (IEEE802.11a, DVB-T) analysis, simulation, optimization and implementation aspects." Stuttgart Fraunhofer-IRB-Verl, 2007. http://d-nb.info/988796562/04.
Повний текст джерелаD’Amico, William P., Patrick A. Stadter, Mark H. Lauss, and Andrew Hooper. "Network Telemetry: Practical Experiences and Unique Features." International Foundation for Telemetering, 2002. http://hdl.handle.net/10150/606321.
Повний текст джерелаThe US Army’s Yuma Proving Ground (YPG) uses a wireless local area network (WLAN) to gather test data. It is desired to extend this WLAN to support tests of gun-launched munitions where miniature and rugged data acquisition hardware will be required. The Two Way Robust Acquisition of Data (2-RAD) program has been initiated under the Central Test and Evaluation Investment Program (CTEIP) to develop a process to expand the use of WLAN technology, which is now primarily used at YPG for internal ballistic test data acquisition.
Chakroun, Omar. "Techniques de contrôle de congestion et de dissémination d'informations dans les réseaux véhiculaires." Thèse, Université de Sherbrooke, 2014. http://hdl.handle.net/11143/5893.
Повний текст джерелаKoujah, Fahad. "A Power-Aware Routing Scheme for Ad Hoc Networks." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/28248.
Повний текст джерелаPh. D.
Joakim, Carlsson. "CloudMAC Frame Prioritization : QoS and routing of IEEE802.11 frames in a Opendaylight controlled network." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-36313.
Повний текст джерелаRademacher, Michael [Verfasser]. "Evaluation and Optimization of IEEE802.11 multi-hop Backhaul Networks with Directional Antennas / Michael Rademacher." München : Verlag Dr. Hut, 2020. http://d-nb.info/1219476943/34.
Повний текст джерелаD’Amico, W., J. Burbank, W. Kasch, J. Andrusenko, and G. Barrett. "A WLAN Concept for Data Acquisition from Multiple Target Vehicles." International Foundation for Telemetering, 2003. http://hdl.handle.net/10150/605365.
Повний текст джерелаTests for missile defense systems are very complex, and present challenging issues for the extraction of target lethality data. Future tests will involve the use of multiple interceptors and targets with some of these assets following over-the-horizon (OTH) trajectories. The use of wireless local area network (WLAN) technologies for the acquisition of test data offers a novel approach to manage data bandwidths and link margins over-the-air (OTA) as functions of time and asset. Notional test scenarios are examined for the suitability of WLAN technologies to missile defense intercept testing.
CORDEIRO, CARLOS DE MORAIS. "MEDIUM ACCESS CONTROL PROTOCOLS AND ROUTING STRATEGIES FOR WIRELESS LOCAL AND PERSONAL AREA NETWORKS." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1070579302.
Повний текст джерелаKarlsson, Carl. "IMPULSIVE NOISE MODELING AND COEXISTENCE STUDY OF IEEE 802.11 AND BLUETOOTH." Thesis, University of Gävle, Department of Technology and Built Environment, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-308.
Повний текст джерелаThis thesis describes the interference problem between IEEE 802.11 and Bluetooth. These well established communication standards are often used together simultaneously. Since both standards operate in the ISM-band at 2.45 GHz, they interfere with each other. In addition to this, interference from e.g. microwave ovens, heating processes, electric motors and cordless phones also occurs on the ISM-band. Due to this interference problem, a model has been developed in MATLAB to further investigate these interferences and the effects for the user.
The interference is modelled using the well known Class-A model for impulsive noise. The interference model is parameterized in the model and therefore the noise source(s) is described by a set of parameters derived from real measurements. Models for IEEE 802.11 legacy/b and Bluetooth are based on work published on the user community of MATHWORKS. To get a measure of performance, results from the model are presented as BER (Bit Error Rates) and PER (Packet Error Rates). When Bluetooth is used as a voice link, sound quality can also be performance evaluated directly by simply listening to a voice output file. To be able to track down a specific problem cause, measuring tools have also been included in the model to gain insight into what is causing bit/packet error.
A model describing the interference problem has been developed describing the real world usage of the standards by the use of state machines. Due to the complexity of the problem, and also for the model to be user friendly, this thesis is not composed of a thorough mathematical derivation describing BER probability for different modulation forms. The derivations for these has already been done and is therefore summarized and compared to when the model is validated. The model has been developed as a proof of concept for further work to fully support the current and coming IEEE standards for IEEE 802.11 and Bluetooth.
Myers, Robert L. "SMART SENSORS VS DISTRIBUTED DATA ACQUISITION." International Foundation for Telemetering, 2001. http://hdl.handle.net/10150/606371.
Повний текст джерелаDistributed processing is coming to data acquisition. The desire for smart sensors that can preprocess data, is growing. Making sensors themselves intelligent will reverse the historic trend toward smaller and cheaper sensors. Incorporating current sensor technology into data acquisition nodes in a network will create a distributed data acquisition, DAQ, environment that can acquire data from around the world over the Internet. The future is now.
Parks, Jeremy. "A Texas Instruments C33 DSP PCI platform for high-speed real-time implementation of IEEE802.11a Wireless LAN algorithms." [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0002880.
Повний текст джерелаLI, XUEYUN. "Enabling communication between border router and 6LoWPAN-based WSN for Healthcare." Thesis, Mittuniversitetet, Institutionen för informationsteknologi och medier, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-14155.
Повний текст джерелаZhang, Lei. "Architecture et mecanismes de bout en bout pour les communications mobiles et sans fil dans l'internet." Phd thesis, Institut National Polytechnique de Toulouse - INPT, 2009. http://tel.archives-ouvertes.fr/tel-00435868.
Повний текст джерелаMancini, Mattia. "Caratterizzazione sperimentale di sistemi per il ranging basati su tecnologia uwb." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9298/.
Повний текст джерелаZhang, Xiaohu. "VHF & UHF energy harvesting radio system physical and MAC layer considerations." Thesis, Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/1435.
Повний текст джерелаFontolan, Luis Fernando. "Pol?tica de QoS para redes IEEE802.11 com sele??o de taxa de servi?o baseada em ?ndice de justi?a." Pontif?cia Universidade Cat?lica de Campinas, 2010. http://tede.bibliotecadigital.puc-campinas.edu.br:8080/jspui/handle/tede/515.
Повний текст джерелаThe IEEE802.11 standard assumes that the stations (STAs) of a communications network have the same condictions during medium access, through the usage of the DCF (Distributed Coodination Function). The DCF states that all stations have the same probability of medium access, regardless of transmission rates or signal to noise ratios. Furthermore, such networks also presents an anomaly by which it is possible that a station with low transmission rate may request the channel for an extended period of time. In this context, this work proposes a QoS policy-based implementation based on the 802.11e standard, which aims to maintain a scenario of greater justice in IEEE802.11 networks. In doing so, it is proposed an algorithm to determine a Justice Index associated to a specific network, by examining the STAs connection rate, their type of service and the requirements for customer service. Thus, stations are served at rates that consider the physical characteristics of the network, in order to optimize their resources, from the viewpoint of the service provider. Results were obtained on simulated networks using the NS2 software considering the proposed policy of justice and show that the analyzed scenarios yield network troughput gain or at least result in a condition similar to that obtained without the use of the proposed justice policy.
O padr?o IEEE802.11 foi especificado presumindo condi??es de igualdade em rela??o ao acesso ao meio por parte das STAs de uma rede, pelo emprego do m?todo DCF , onde todas as STAs possuem a mesma probabilidade de acesso ao meio, sem levar em considera??o sua taxa de transmiss?o ou sua rela??o sinal-ru?do. No entanto, ? necess?rio ressaltar que tais redes apresentam uma anomalia, atrav?s da qual ? poss?vel que uma STA com baixa taxa de transmiss?o venha a ocupar o canal por um grande per?odo de tempo. Nesse contexto, esse trabalho apresenta uma proposta de pol?tica de QoS baseada na implementa??o do padr?o 802.11e, que objetiva manter um cen?rio de maior justi?a em redes IEEE802.11. Para isso ? proposto um algoritmo de c?lculo de ?ndice de justi?a atrav?s da an?lise da taxa de conex?o, do tipo de servi?o e dos requisitos necess?rios para atendimento do servi?o. Assim, as STAs s?o servidas a taxas que levam em conta as caracter?sticas f?sicas da rede, de forma a otimizar os seus recursos, do ponto de vista do provedor. Resultados obtidos com a pol?tica proposta em redes simuladas atrav?s do software NS2 demonstram que os cen?rios analisados resultaram em um ganho em rela??o ao troughput da rede ou, no m?nimo, em uma condi??o semelhante ? obtida sem a utiliza??o da pol?tica.
Azizian, Meysam. "Partage des ressources dans le nuage de véhicules." Thèse, Université de Sherbrooke, 2017. http://hdl.handle.net/11143/11526.
Повний текст джерелаAbstract : In recent years, we have observed a growing interest in information accessibility and especially innovative approaches for making distant services accessible from mobile devices across the world. In tandem with this growth of interest, there was the introduction of vehicular communication, also known as vehicular ad hoc networks (VANET), leveraging onboard sensors and wireless communication devices to enhance road safety and driving experience. Vehicles wireless accessibility to the internet has triggered the emergence of service packages that can be available to or from vehicles. Recently, an extension of the vehicular networks paradigm has been promoted to a new level. Vehicular cloud (VC) is the ultimate convergence between the cloud computing concept and vehicular networks for the purpose of service provisioning and management. Vehicles can get connected to the cloud, where a multitude of services are available to them. Also vehicles can offer services and act as service providers rather than service consumers. This is possible because of the variety of resources available in vehicles: computing, bandwidth, storage and sensors. In this thesis, we propose novel and efficient methods to enable vehicle service delivery in VC. Several schemes including cluster/cloud formation, transmission scheduling, interference cancellation, and frequency assignment using software defined networking (SDN) have been developed and their performances have been analysed. The proposed cluster formation schemes are DHCV (a distributed D-hop clustering algorithm for VANET) and DCEV (a distributed cluster formation for VANET based on end-to-end relative mobility). These clustering schemes are used to dynamically form vehicle clouds. The schemes group vehicles into non-overlapping clouds, which have adaptive sizes according to their mobility. VCs are created in such a way that each vehicle is at most D-hops away from a cloud coordinator. The proposed transmission scheduling implements a contention-free-based medium access control where physical conditions of the channel are fully analyzed. The interference cancellation scheme makes it possible to remove the strongest interferences; this improves the scheduling performance and resource sharing inside the constructed clouds. Finally, we proposed an SDN based vehicular cloud solution where different frequency bands are assigned to different transmission links to improve the network performance.
Zheng, Guei-Tai, and 鄭貴太. "In-Building Localization Using ZigBee IEEE802.15.4." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/56607398505845054597.
Повний текст джерела元智大學
電機工程學系
97
Positioning technologies and applications of a wireless sensor network have become a hot topic due to its rapid growth. RSSI (Received Signal Strength Indicator) technology is investigated and adopted for positioning in this study. In case of indoor environment, radio signals are usually influenced with building interferences which produce reflection, scattering, and diffraction effects. This results in an unstable data if signal reception strength index used for positioning. In addition to the use of RSSI for localization and distance measurement, in this thesis, neighboring method is also used, where two nodes having a SS (Strongest signal) and a NSS (Next strongest strength) are localized. A RSSI database involving the ranging energy and an interpolation scheme are further used to obtain more accurate position information. Based on our experimental results in Building 7 at Yuan Ze University, the feasibility of the proposed approach has been confirmed.
HUANG, HSIN-FU, and 黃信富. "Analysis of IEEE802.15.4 in perfect channels." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/33625049280209369255.
Повний текст джерела元智大學
電機工程學系
93
The IEEE has announced the 802.15.4 standard for Low Data Rate Wireless Personal Area Networks (LR-WPAN). It can be used in wireless sensor networks . The main features of LR-WPAN are ease of installation, reliable data transfer, short-range operation, and low-cost. The MAC layer of IEEE802.15.4 employs the CSMA/CA mechanism for multiple access. In the thesis, theoretical analysis of the throughput and delay for the CSMA/CA in IEEE802.11.4 is addressed, and the Matlab is applied to obtain the corresponding numerical performance of throughput and delay for channel assessment and access.
Huang, Chia-Chin, and 黃家進. "Implementation of a wireless communication device using IEEE802.15.4." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/33773015299061044364.
Повний текст джерела輔仁大學
電子工程學系
98
The thesis in fact to use ZigBee chip of CC2430 on IEEE 802.15.4, can setup ZigBee network structure, and we have designed USB function. We will get the temperature and voltage data from the computer, that receive data form the ZigBee End Device by IEEE 802.15.4 protocol, and these data can pass on our modular-system through ZigBee Router, will convey the distance to lengthen, We have realized ZigBee network structure, and reads the temperature and voltage with ZigBee protocol, and shown the status in demo screen.
Ghose, Debasish, and Debasish Ghose. "Soft Detection for STBCs in IEEE802.11ac." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/98616337050685200719.
Повний текст джерела國立臺北大學
通訊工程研究所
102
The Multiple-Input Multiple-Output (MIMO) system applications are very important for many next generation communication standards, i.e. LTE, LTE-Advance and IEEE 802.11ac etc. Multiple-Input Multiple-Output (MIMO) techniques are used to improve the throughput and link quality of wireless systems. One of the MIMO techniques is space-time block coding (STBC), which improves the system performance by providing a higher diversity order. Gradually STBCs became popular because of its fast signal detection profile at the receiver end. The Maximum Likelihood (ML) detector is optimum, but its complexity is too high. The purpose of this thesis is to propose a well organized and fixed complexity soft-output STBC detection criterion for an important standard IEEE 802.11ac which will be easier for hardware implementation. In the first part of this thesis, we investigate the performance of various sub-optimum detection methods. Then we focus on the near optimal detection scheme that combines efficient candidate selection technique and derive its general solutions. Finally, a fixed complexity soft-output STBC detector is proposed based on the modified ML detection metric and parallel smart candidate adding algorithm which has a wide range of trade-off between performance and complexity.
Lin, Yu-De, and 林育德. "IEEE802.11b WLAN Circuits Design and Test." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/35360347316243800065.
Повний текст джерела國立臺灣大學
電信工程學研究所
93
In this thesis, the design and test of IEEE 802.11b WLAN circuits are described. The circuit blocks consist of baseband processor RF3002, IF and RF transceiver RF2958, power amplifier RF5189, RF filter, RF switches, IF SAW filter and regulators. The circuits are fabricated with four-layer PCB process. The implemented wireless LAN card can provide four kinds of data rates which are 1Mbps(DSSS), 2Mbps(DSSS), 5.5Mbps(CCK), and 11Mbps(CCK) based on IEEE802.11b specification. For the software implementation, the C language code compiled by Keil is downloaded to the microprocessor by the USB interface to control and coordinate the functions between the circuit blocks of WLAN card. The introduction of IEEE 802.11 WLAN standard is presented in Chapter 1. Chapter 2 describes the specification of the 802.11b WLAN physical layer and circuit system design. The circuit design consisted of baseband processor, IF and RF transceiver, power amplifier, front-end circuit, dc power circuits, PHY interface circuits, MAC control circuits, and link budget are described in Chapter 3. Chapter 4 gives the circuit layout to realize the designed circuit on a four layer PCB. Chapter 5 describes the test results of each circuit and demonstrates the data transmitting and receiving of the developed WLAN cards. Finally, the conclusion is given in the Chapter 6.
Huang, Shi-Jie, and 黃世傑. "Power Analysis for IEEE802.11 Wireless LAN." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/79424005906752337808.
Повний текст джерела國立成功大學
電腦與通信工程研究所
93
Power consumption is one of the bottlenecks for mobile devices。 In thesis， a new Markov model is developed to analyze the power efficiency of IEEE 802.11 Wireless LANs Distributed Coordination Function (DCF) protocol by taking into account the idle channel and the error channel， collisions， packet retry limits and no retry limit and freezing mechanism in backoff。 Based on the proposed mathematical model and power dissipation due to transmission and receiving， the power consumptions in different states of a tagged station performing the DCF protocol are computed。 The total power consumption and power efficiency of the DCF protocol is calculated accordingly。 We then investigate the influence of the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) protocol upon the power efficiency of IEEE 802.11a and IEEE 802.11b Wireless LANs through combining the joint effect of MAC and PHY layers。 Finally， system performance and design criterions for IEEE 802.11 Wireless LANs are concluded。
Tzeng, Sheng-Tai, and 曾聖太. "IEEE802.11 Wireless LAN and Multimedia Transmission." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/79208171972149136938.
Повний текст джерела國立成功大學
電腦與通信工程研究所
93
In recent years,mobile ad hoc network has become a widely used technology which is based on IEEE 802.11 standards.First,we study FCR(FAST COLLISION RESULOTION and compare with DCF(Distributed Coordination Function). Recently,more and more attention has been attracted to providing quality of service (QoS) for real-time traffic in wireless ad hoc networks as the increase of real-time applications. However, the Distributed Coordination Function (DCF), the popular communication protocol in IEEE 802.11 standard, fails to provide QoS guarantee for real-time applications. In this thesis, we proposed a dynamic adaptive area based on Utilization Ratio control to improve the throughput and delay and then to transmit multimedia in wireless local area network.
Hsiung, Po-Hsiang, and 熊柏翔. "IEEE802.11 Hardware Implementation of Collision Protocol." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/45615314937834277350.
Повний текст джерела國立臺灣科技大學
電子工程系
104
IEEE 802.11 defined MAC and PHY layers which built network between base station (BS) and access point (AP). IEEE 802.11 use collision protocol which define inter-frame space (IFS), utilize RTS/CTS and ACK in every transmission to avoid collisions. WARP v3 FPGA board design by Mango Company has been well-known reference design for IEEE 802.11. This reference design implements collision protocol with software. To further improve this reference, this thesis uses hardware implementation.
Hsu, Ming-Shean, and 許銘顯. "IEEE802.11b WLAN RF Front Research and Implement." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/08409835968512413480.
Повний текст джерела中華技術學院
電子工程研究所碩士班
92
There are two types of transceiver framework. One is the super heterodyne framework and the other is the framework with zero intermediate frequency (ZIF). In the report, we present the procedure for how to realize the RF front circuit (including transceiver and power amplifier) of a super heterodyne transceiver. How to make the simulation and how to realize the RF circuit will be presented. The SystemView software is used to simulate a 2.4GHz IEEE802.11b RF front circuit. In the circuit realization part, the PowerLogic software was used for routing the implementation circuit, and then, the PowerPCB software was used to accomplish the printed circuit board layout. This paper is also talked about how to build up the routing rules for the realization of a 2.4GHz RF circuit and how to reduce the size of the realized printed circuit board for mass production cost down. Finally, if the designer is lack of passive components such as accurate chip capacitors, accurate chip inductances, or filters, the designer can replace these passive components by transmission line circuits and use HP ADS software for simulation.
Lin, Po-Niang, and 林柏年. "5GHz CMOS Transmitter Front-End for IEEE802.11a." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/29179402015658858114.
Повний текст джерела國立交通大學
電子工程系
91
In this thesis, a direct-conversion transmitter front-end for IEEE 802.11a is designed and fabricated using UMC 0.18μm 1P6M CMOS technology. The transmitter front-end contains quadrature mixer in I, Q branches and a preamp. Both chip and package assembly had been implemented. The measurement result of the on-wafer version shows that the conversion gain is 0.94 dB, 1-dB compression voltage is 315 mV and maximum output power of 0 dBm which can meet the specification of our IEEE 802.11a system. The packaged version has the spurious suppression of at least 30 dBc and carrier suppression of 29 dBc. However, due to the PCB and imprecise package model the conversion gain is lower than expected. The conversion gain is -14.5 dB, 1-dB compression voltage is 880 mV and maximum output power is -6.6 dBm.
Kuan, Ching-Chien, and 管清健. "A QoS Provision Multipolling Mechanism for IEEE802.11e Standard." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/27422230230684166495.
Повний текст джерела東海大學
資訊工程與科學系
93
With flexibility and mobility, Wireless Local Area Network (WLAN) has rapidly become one of the most emergent computer research fields. It attracts significant interests both in academic and industry communities. IEEE 802.11, the standard of WLAN, encompasses Distributed Coordination Function (DCF) and Point Coordination Function (PCF) operational modes to process asynchronous and time-bounded traffic respectively. However, the protocol suffers from lacking priority and access control policy so that it is hard to cope with various types of multimedia traffic as well as user mobility (handoff). For applying a higher Quality of Service (Qos) to network applications, the 802.11e Task Group has deployed hybrid coordination function (HCF) to improve the original IEEE 802.11 Medium Access Control (MAC) protocol. The HCF defines two medium access mechanisms, one of them is channel access control. Nevertheless, how to choose the right MAC parameters and QoS mechanism so as to achieve a predictable performance still remain unsolved. In this paper, we propose a Qos Provision Multi-polling Mechanism(QPMM) which is in the PCF mode deploys non-preemptive priority in order to transfer voice packets more efficiently. The voice traffic characterized by packet rate of voice source and the maximum tolerable jitter (packet delay variation) is forecasted. We record the scheduling results in a queue, with which AP (Access Point) can poll and then enable mobile users to communicate with their opposite sites. This occurrence also solves the problem that some voice packets do not suit QoS in IEEE 802.11e standard with multi-polling. During the time-gap while transmitting no voice packets, the scheme changes to DCF mode to transfer data packets. Furthermore we simulate and analyze the performance of the scheme in a WLAN environment. The experimental results show that our approach can dramatically improve the quality of network service.
Liu, Hsuan-Yu, and 劉軒宇. "An OFDM Baseband Transceiver for IEEE802.11a WLAN Application." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/19789458897091376209.
Повний текст джерела國立交通大學
電子工程系
89
Orthogonal frequency division multiplexing (OFDM) system has been applied for high-speed baseband transceiver for IEEE802.11a standard such the wireless LAN (WLAN) in 5GHz band. Due to that OFDM system is an effective modulation technique for high-rate and high-speed transmission over frequency selective fading channels, OFDM baseband transceiver has been applied for advanced high-speed WLAN. This thesis presents a complete architecture of OFDM baseband transceiver. Both high-level simulation and hardware optimization improve the hardware architecture to get high data rate, high transmission performance, and low hardware cost. The simulation environment with OFDM system and AWGN channel has been established in order to estimate performance of overall WLAN transmission system. Due to quantization error induced by OFDM baseband transceiver such a fixed-point approach, the wordlength of FFT, resolution of both digital-to-analog converter (DAC) and analog-to-digital converter (ADC) will influence the error rate performance of OFDM system. So high-level simulation proceeds with AWGN channel. Radix-64 64-point pipeline FFT processor is proposed for low memory requirement. Hardware optimization improves it to a high efficiency of hardware sharing design. For lower synchronization error, dynamic ADC sampling methodology with a digital frequency synthesizer (DFS) is proposed for timing recovery. The all cell-base DFS can reduce turnaround time and improve synchronization performance of OFDM baseband transceiver. The complete hardware architecture of OFDM baseband transceiver, algorithm of radix-64 64-point pipeline FFT processor, and the simulation of OFDM system with AWGN channel will be introduced and discussed particularly in this thesis.
Peng, Chih-An, and 彭志安. "Cooperative Communications with IEEE802.11a/g Wireless LAN Systems." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/64241450747484162189.
Повний текст джерела國立交通大學
電機學院碩士在職專班電信組
96
Diversity is a well-known technology combating fading effects in wireless communications. Diversity, in time, frequency or space, can be obtained with signals transmited through independent fading channels, and received by some combining technique. Spatial or antenna diversity has the advantage that it does not have to increase the transmition time and bandwidth. However, in many case, the transmitter have limits on its phisical size or cost. As a result, multiple antennas are either not allowed, or the diversity gain is not significant. Cooperative diversity is a recently developed diversity technique. With the technique, a transmitter with only one antenna can have spatial diversity provided by the virtual antenna array, joined formed with other transmitters. In the literature, most works in cooperative communications focus on theoretic inverstigation. Few results are reported in the performance evaluation of real-world systems. In this thesis, we fill this gap by investigating the cooperative communications with IEEE 802.11a/g wireless LAN systems. Using well-knonw cooperative protocols, we conduct performance evaluation with extensive simulations. The results show that the performance of the wilress LAN system can be significantly enhanced through user cooperation.
Zhang, Jie, and 張傑. "IEEE802.11 ac WLAN 5.25GHz CMOS RF Transmitter Design." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/83583404376247869109.
Повний текст джерела國立臺灣海洋大學
電機工程學系
102
In this thesis, we design a 5.25GHz RF transmitter front-end, mainly used in IEEE 802.11ac system and composed of a voltage-controlled oscillator, a mixer, and a power amplifier. The circuit components are simulated using TSMC 0.18 um 1P6M CMOS Mixed-Signal model and the Agilent Advanced Design System (ADS) software provided by National Chip Implementation Center. The voltage controlled oscillator uses current reused architecture and gm boosting technique to reduce power consumption and uses the mutual inductance to increase the circuit Q value and reduce the chip area. Measurement results show that the tuning range is up to 11.7%. When the oscillation frequency is 5.03GHz, the output power is -4.5dBm, the phase noise is -110dBc/Hz at 1MHz offset, the performance indicators FOMT is -173.7dBc. When the supply voltage is 1.8V, the power consumption is 15.3mW and the chip area is 0.725 #westeur024# 0.540mm2. The mixer is designed with double balanced mixer architecture and common mode feedback architecture for the load level to improve conversion gain. In the transconductance stage, we use a modified two common source architecture to amplify the IF signal. Measurement results show that the output signal frequency is 5.25GHz, the conversion gain is 9.11dB, input 1dB compression point is -16dBm, input third-order intercept point is -5dBm, LO-RF isolation is 29.3dB, LO-IF isolation is 45.6dB, IF-RF isolation is 113.3dB. When the supply voltage is 1.8V, the power consumption is 9.54mW and the chip area is 1.209 #westeur024# 1.421 mm2. The overall architecture of power amplifier is divided into two stages. The first stage adopts current reused architecture to reduce power consumption, and uses the folded cascode architecture to increase the gain. The second stage uses a common source architecture to increase the output power and the linear bias circuit to improve the linearity. Measurement results show that the output signal frequency is 5.25GHz, the conversion gain is 10.248dB, output 1dB compression point is 6.5dBm, output third-order intercept point is 19dBm, power added efficiency is 12.8%. When the supply voltage is 1.8V, the power consumption is 79.7mW and the chip area is 1.291 #westeur024# 0.857mm2. The RF transmitter front-end is designed with direct up-conversion architecture to reduce passive components and power consumption. Simulation results show that when the input IF signal frequency is 10MHz and local oscillator signal frequency is 5.24GHz, the output RF signal is 5.25GHz, power gain is 38.543dB, output 1dB compression point is 14.568dBm, input 1dB compression point is -22dBm, output third-order intercept point is 40dBm, input third-order intercept point is 1.5dBm. When the supply voltage is 1.8V, the power consumption is 110.52mW.
Martins, Marco Filipe Luz. "Plataforma de Visualização de Dados para uma Rede Wi-Fi." Master's thesis, 2021. http://hdl.handle.net/10348/10558.
Повний текст джерелаNuma sociedade cada vez mais evoluída e com o aumento de dispositivos eletrónicos ligados à Internet que cada utilizador possui, verificamos que alguns métodos de análise de tráfego na rede Wi-Fi não acompanham as novas tendências. Desde que existe Internet, existe necessidade de a monitorizar para manter um acesso estável e de qualidade de serviço, essa necessidade é maior nos dias atuais devido à quantidade de serviços dos quais a Internet é o elemento chave para a sua realização. Atualmente procuramos sempre a rede com o melhor serviço e é com isto em mente que foi desenvolvido um sistema para monitorizar o tráfego na rede através de testes de largura de banda, análise da potência e disponibilidade de rede. Para o desenvolvimento deste projecto serão utilizadas sondas para analisar tráfego da rede Wi-Fi gerado pelos APs (Access Points) colocados na UTAD (Universidade de Trás os Montes e Alto Douro), a rede será analisada a partir da sonda que fará a recolha de dados e os envia para um servidor do qual será realizada uma avaliação de performance. Esses dados podem ser utilizados no futuro para tomada de decisão dos órgãos gestores como a UTAD - SIC (Universidade Montes e Alto Douro - Serviços de Informática e Comunicações). A aplicação desenvolvida foi testada usando a eduroam na UTAD. O objetivo desta dissertação é desenvolver uma aplicação Web que leve em consideração o uso da rede, permitindo ao administrador tomar uma decisão de forma facilitada e fundamentada no caso de ocorrer um problema.
In a developed society and with an increase in the numbers of electronic devices connected to the Internet that each user possesses, we find that some methods for analyzing traffic on the Wi-Fi network do not keep up with the new trends. Since there is an Internet, there is a need to monitor it to maintain stable access and quality of service, this need is greater nowadays due to the quantity of services of which the Internet is the key element for its realization. Currently we always look for the network with the best service and it is with this in mind that a system has been developed to monitor traffic on the network, perform coverage tests and test the authentication of users who want to access the network. For the development of this project, probes will be used to analyze Wi-Fi network traffic generated by the Access Points placed at UTAD (Universidade de Trás os Montes e Alto Douro), the network will be analyzed from the probe that will collect data data and sends it to a server from which a performance evaluation will be carried out. These data can be used in the future for decision-making by management bodies such as UTAD - SIC (Universidade Montes and Alto Douro - Serviços de Informática e Comunicações). The developed application was tested using textit eduroam at UTAD. The objective of this dissertation is to develop a Web application that takes into account the use of the network, allowing the administrator to make an easy and fundamentally decision in the event of a problem.