Готові списки джерел за темами / IEEE802.11.4

Добірка наукової літератури з теми "IEEE802.11.4"

Автор: Grafiati

Опубліковано: 14 березня 2023

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями

Оберіть тип джерела:

Зміст

Статті в журналах
Дисертації
Книги
Частини книг
Тези доповідей конференцій

Ознайомтеся зі списками актуальних статей, книг, дисертацій, тез та інших наукових джерел на тему "IEEE802.11.4".

Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.

Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.

Статті в журналах з теми "IEEE802.11.4"

Mohi Uddin, Khandaker Mohammad, Nayeema Islam, Nur-A. Alam, and Jahanara Akhtar. "Performance Comparison of IEEE802.11a, IEEE802.11b, IEEE802.11g and IEEE802.11n in Multiple Routers." Asian Journal of Applied Science and Technology 04, no. 04 (2020): 65–72. http://dx.doi.org/10.38177/ajast.2020.4406.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Ali Mohammed, Almutaz, and Ibrahim Elimam Abdalla. "Performance Analysis of FTP, HTTP and Database for IEEE802.11, IEEE802.11a, IEEE802.11b and IEEE802.11g using OPNET Simulator." International Journal of Computer Trends and Technology 38, no. 2 (August 25, 2016): 57–62. http://dx.doi.org/10.14445/22312803/ijctt-v38p111.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Ammar, F., and Hanafi Hanafi. "ANALISIS TRANSFER RATE WIRELESS LOCAL AREA NETWORK DENGAN STANDAR IEEE 802.11A DAN IEEE 802.11G PADA KANAL LINE OF SIGHT." Jurnal Ecotipe (Electronic, Control, Telecommunication, Information, and Power Engineering) 3, no. 1 (April 26, 2016): 31–39. http://dx.doi.org/10.33019/ecotipe.v3i1.28.

Повний текст джерела

Анотація:

WiFi bekerja pada band 2,4 GHz dan 5 GHz. Standar WiFi yang bekerja pada frekuensi ini antara lain IEEE802.11g dan IEEE802.11a. Pada penelitian ini dilakukan pengukuran terhadap transfer rate download dan upload data dengan standar IEEE802.11g dan IEEE802.11a. Pengukuran dilakukan pada kanal Line of Sight (LOS), menggunakan dua buah laptop yang dihubungkan dengan Access Point (AP) standar IEEE802.11g dan IEEE802.11a. Hasil penelitian diperoleh, pada standar IEEE802.11g, transfer rate download dan upload data tertinggi 2.662,54.KB/s dan 2.549,60 KB/s, dan terendah 484,50.KB/s dan 477,40 KB/s, sedangkan pada standar IEEE802.11a, transfer rate download dan upload data tertinggi 8.104,68 KB/s dan 5.744,24 KB/s, dan terendah 872,24 KB/s dan 465,38.KB/s. Pada standar IEEE802.11g, transfer rate download dan upload data pada sinyal terendah hingga di bawah 35% dan 30%, dari transfer rate download dan upload data tertinggi. Pada standar IEEE802.11a, transfer rate download dan upload data pada kualitas sinyal terendah hingga di bawah 20% dan 30%, dari transfer rate download dan upload data tertinggi. Kemampuan transfer rate download data Standar IEEE802.11a, 2–3 kali lebih baik pada kondisi kualitas sinyal tertinggi, dan tidak lebih dari 2 kali pada kondisi kualitas sinyal terendah, dibandingkan kemampuan transfer rate download data standar IEEE802.11g. Kemampuan transfer rate upload data Standar IEEE802.11a, 1,4–3 kali lebih baik pada kondisi kualitas sinyal tertinggi, dan 1-3 kali lebih baik pada kondisi kualitas sinyal terendah, dibandingkan kemampuan transfer rate upload data standar IEEE802.11g.

Стилі APA, Harvard, Vancouver, ISO та ін.

Alwer, Abdulkader O., Jawad Rasheed, Adnan M. Abu-Mahfouz, and Parvaneh Shams. "Study and Evaluation of Quality of Services in Mobile Internet Protocol v6 Using IEEE802.11e." Wireless Communications and Mobile Computing 2022 (November 17, 2022): 1–11. http://dx.doi.org/10.1155/2022/3092512.

Повний текст джерела

Анотація:

Mobile Internet Protocol v6 (MIPv6) is a protocol that allows a mobile node (MN) to transparently maintain connections while moving from one subnet to another. Using the route optimization (RO) method in MIPv6 gives optimized routing and helps avoid triangular routing. In real-time applications such as video conference applications, quality of service (QoS) issues will increase especially in the handover process between subnets. This study investigates the performance of MIPv6 handover in IEEE802.11e standard in wireless environments. The investigation considers that handover for the MN moves between 2 home agents (HA). The system model’s fundamental performance limits are measured by packet delay variation, HA binding delay, and wireless local area network (WLAN) media access delay analysis metrics in video conference applications. According to the results of real-time simulations, network performance during the handover process can be effectively improved as the packet lost during handover decreased significantly from 43% in IEEE802.11b distributed coordination function (DCF) to 36% in IEEE802.11e hybrid coordination function (HCF). Furthermore, experimental results prove that IEEE802.11e connects to new HA roughly 20% quicker than IEEE802.11b, and IEEE802.11b has 100 times more time delay than IEEE802.11e. In addition to this, the WLAN media access delay of IEEE802.11b often reaches 0.00011 s as compared to 0.000005 s of IEEE802.11e. Thus, it is evident that the performance of IEEE802.11e in terms of packet delay variation, HA binding delay, and WLAN media access delay is better than IEEE802.11b. Likewise, it is noted that network speed during the handover process in IEEE802.11e can be considerably improved in a MIPv6 scenario.

Стилі APA, Harvard, Vancouver, ISO та ін.

Fapohunda, Kofoworola, Eberechukwu Numan Paulson, Zubair Suleiman, Oladimeji Saliu, David Michael, and Kamaludin Mohammed Yusof. "Application of Bat Algorithm for The Detection of Hidden Nodes in IEEE802.11ah Networks." ELEKTRIKA- Journal of Electrical Engineering 18, no. 1 (April 24, 2019): 11–15. http://dx.doi.org/10.11113/elektrika.v18n1.129.

Повний текст джерела

Анотація:

Hidden node problem sometimes referred to as frequent packets collision that mostly leads to loss of packets is no longer new in wireless networks because it affects the previous IEEE802.11 standards. The new IEEE802.11ah standard which is also a sub-standard of IEEE 802.11 is no exemption. As a matter of fact, IEEE802.11ah suffers from a hidden node problem more than networks (IEEE 802.11a/b/n/ac) due to their wider coverage which is up to 1km, high number of devices they can support (over 8000 nodes to one AP) and frequent simultaneous sleeping and sending of the nodes (power saving mode). A few researchers have worked on this hidden node problem in IEEE802.11ah but could not get a lasting solution to it. Therefore, this paper proposes an algorithm which detects hidden nodes and also proposes a theoretical solution based on previous works which was also experimentally verified through the BIHD-CM.

Стилі APA, Harvard, Vancouver, ISO та ін.

Sharif, Atif, Vidyasagar M. Potdar, and A. J. D. Rathnayaka. "Dependency of Transport Functions on IEEE802.11 and IEEE802.15.4 MAC/PHY Layer Protocols for WSN." International Journal of Business Data Communications and Networking 6, no. 3 (July 2010): 1–30. http://dx.doi.org/10.4018/jbdcn.2010070101.

Повний текст джерела

Анотація:

In WSN transport, layer protocol plays a significant role in maintaining the node’s energy budget. To find out the dependency of Transport layer on MAC/PHY layer, the authors have extensively tested various transport protocols using IEEE 802.11, IEEE 802.15.4 MAC/PHY protocols for WSN. For IEEE802.11 and IEEE802.15.4 with RTS/CTS ON the TCP variants has shown >80% packet delivery ratio and 5-20% packet loss, while for UDP it is around >63% and 19.54-35.18% respectively. On average 1-3% additional energy is consumed for packet retransmissions in IEEE 802.11 with RTS/CTS OFF whereas significant energy efficiency is observed in IEEE802.15.4 case. For IEEE 802.11 with RTS/CTS ON high throughput, low packet drop rate and increased E-2-E delay is observed, while for IEEE 802.15.4 improved power efficiency and jitter behavior is observed. This has led the foundation for the future development of the cross-layered energy efficient transport protocol for WSN.

Стилі APA, Harvard, Vancouver, ISO та ін.

Fertig, Katharine, Odilson Tadeu Valle, Eraldo Silveira e Silva, and Tiago Semprebom. "Redes sem fio no monitoramento de falhas de máquinas: uma comparação de tecnologias sem fio com baixa densidade de nodos." Revista Brasileira de Computação Aplicada 14, no. 3 (November 21, 2022): 115–26. http://dx.doi.org/10.5335/rbca.v14i3.13128.

Повний текст джерела

Анотація:

A utilização de redes sem fio em ambientes industriais vem se tornando cada vez mais uma realidade. As principais motivações são o baixo custo de implantação e manutenção, em contraposição às redes cabeadas. Dentro da miríade de aplicações na indústria, o monitoramento de máquinas é particularmente importante pois permite predizer ou detectar a ocorrência de falhas, mitigando custos devido a uma sequência de eventos disruptivos. Principalmente em sistemas legados, os sensores sem fio podem requerer baterias que possibilitem uma longa sobrevivência da rede. O padrão IEEE802.11 por sua popularidade, vem sendo usado no monitoramento de máquinas, apesar do alto consumo de energia. Uma das alternativas é a tecnologia unslotted IEEE802.15.4 e a variante determinista DSME, que, apesar de baixas taxas de transmissão, possuem um perfil de consumo de energia muito baixo. Este trabalho visa avaliar um cenário em topologia estrela, com um salto e com baixa densidade de sensores, comparando estas tecnologias em termos de taxa de pacotes recebidos e energia residual. A avaliação é por simulação e confirma o alto consumo IEEE802.11, porém mostra que as vantagens do DSME, não são tão evidentes, podendo ser melhorado se explorado nas suas características de multifrequência.

Стилі APA, Harvard, Vancouver, ISO та ін.

Zhang, Jian Ping, and Xiao Ling Zeng. "Research and Solution on Bottleneck Problem in Zigbee." Advanced Materials Research 989-994 (July 2014): 4115–18. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.4115.

Повний текст джерела

Анотація:

When the root is collecting data at a tree-based network, more upper nodes is usually with more packets usually. We called this bottleneck problem. The goal of this paper is to solve the bottleneck problem in ZigBee tree network. We use The Beacon-Only Period Approach which has been proposed by IEEE802.15.4b to avoid the collision caused by beacon frame. Moreover, we propose a centralized algorithm (TDMLF) that enables the nodes to fully use the GTS transmission. TDMLF not only avoides the hidden node problem which occurs in IEEE802.15.4, but also enables the entire network to achieve a more effective parallel transmission. Simulation results show that the TDMLF algorithm effectively reduces the bottleneck problem, and thus achieves a high delivery ratio. Moreover, because of no collision, the TDMLF also reduces the waste of time and energy by retransmission.

Стилі APA, Harvard, Vancouver, ISO та ін.

Zheng, Zhe, Wenpeng Cui, Lei Qiao, and Jinghong Guo. "Performance and Power Consumption Analysis of IEEE802.11ah for Smart Grid." Wireless Communications and Mobile Computing 2018 (July 25, 2018): 1–8. http://dx.doi.org/10.1155/2018/5286560.

Повний текст джерела

Анотація:

IEEE802.11ah is a Wireless Local Area Network (WLAN) designed for the application of Internet of Things (IoT) and Machine to Machine (M2M), mainly used in sensor network, smart metering, car network, health care, and other emerging fields. IEEE802.11ah inherits the IEEE802.11n∖ac technology. At present, smart grid has completed the installation of optical fiber communication as its backbone network; WLAN can be used to build new wireless sensor network for smart grid by improving the transmission distance, speed, and power efficiency. The critical features of 802.11ah make it a powerful candidate for WLAN in smart grid, such as intelligent substation sensor network and automatic metering system (AMS). This paper simulates the new added highly robust 1MHz bandwidth and Modulation Coding Scheme (MCS) 10 in the 802.11ah physical layer and analyzes the coverage range and energy-saving performance of 802.11ah based on the simulation results. The analysis shows that the 802.11ah at 1 MHZ MCS 10 mode can obtain 2.5-3 dB gain. Combined with advantages of Sub-1GHz working frequency, 802.11ah could enlarge the coverage range by five times, compared to 2.4 GHz Wi-Fi. On the other side, 802.11ah module used in the smart grid can greatly reduce power consumption, especially in the AMS with a 1.1 kW.H power savings per year. 802.11ah not only provides the flexibility and low cost features of wireless communication, but also brings coverage and energy-saving performance improvements, which leads to good economic benefit.

Стилі APA, Harvard, Vancouver, ISO та ін.

Adachi, Tomoko. "IEEE802.11n." Journal of The Institute of Image Information and Television Engineers 65, no. 7 (2011): 950–53. http://dx.doi.org/10.3169/itej.65.950.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Більше джерел

Дисертації з теми "IEEE802.11.4"

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 джерела

Анотація:

The main goals of diploma thesis are application and realization of tool for projection and installation wireless networks according to IEEE802.15.4. The thesis is specialized in construction of transmitter and receiver device in term of mobility and visualization of data measured in terrain. Than the software support for measuring and control appropriate periphery are summarised and described. The system is defined in C programming language and uses OpenMAC library. Last part of thesis is focus on practical measurement and testing tool for projection and installation wireless network.

Стилі APA, Harvard, Vancouver, ISO та ін.

Hameed, 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 джерела

Анотація:

The 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.

Стилі APA, Harvard, Vancouver, ISO та ін.

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 джерела

Анотація:

Indoor positioning is a technique that is used to locate a mobile device in indoor environment in real or near real-time. The demand for indoor positioning system as a location based system is becoming more and more widespread. However, the field has not gain much success as outdoor positioning system. The objective of this thesis work is to design and implement an indoor positioning system that relies on ultra wide band technology. The report also describes the way how to implement IEEE802.15.4a physical layer and medium access layer .The system uses time difference of arrivals technique to estimate the position of the mobile device. Through an evaluation of our system, we conclude that ranging can reach an accuracy of ±20cm in line of sight measurement and ± 50cm for non-line of sight measurement. But the localization that is achieved has an accuracy is up to ±1.1m, we believe this can be improved by having all device to be synchronized effectively.

Стилі APA, Harvard, Vancouver, ISO та ін.

Liu, 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 джерела

Анотація:

Telecommunications is converging on the use of IP based networks. Due to the low cost of VoIP applications, they are being increasingly used instead of conventional telephony services. IEEE802.11 WLANs are already widely used both commercially and domestically. VoIP applications will also expand from usage over wired networks to voice communications over IEEE802.11 WLANs. This is known as VoWLAN. The use of VoWLAN may reach the maximum capacity of a wireless channel if there are many simultaneous VoIP calls operating close to each other. There is much published research based on a single IEEE802.11 infrastructure WLAN concluding that packet loss, transmission efficiency and latency issues are the major challenges limiting the VoWLAN capacity. The VoIP service quality will drop sharply when the demands exceed the WLAN’s capacity. This thesis demonstrates that these challenges also apply to distributed WLANs. To extend these findings from the existing research, the analysis in this thesis indicates that the capacity of a single IEEE802.11 WLAN channel is 12 VoIP calls. When the number of simultaneous VoIP calls is within the capacity, the WLAN can deliver more than 90% of the voice packets to the receiver within 150 ms (the lowest network performance for supporting acceptable VoIP service). However, as soon as the traffic loads are beyond the wireless channel capacity e.g. the number of simultaneous VoIP calls is greater than 13, the VoIP service quality catastrophically collapses. When the capacity is exceeded there are almost no voice packets that can be delivered to the receiver within 150 ms. Our research results indicate that the delay accumulation for voice packets in the transmitter’s outgoing buffer causes this problem. Our research also found that dropping ‘stale’ voice packets that are already late for delivery to the receiver can give more transmission opportunities to those voice packets that may still be delivered in time. This thesis presents a new strategy called Active Cleaning Queue (ACQ) which actively drops ‘stale’ voice packets from the outgoing buffer and prevents the accumulation of delay in congested conditions. When ACQ is applied in a saturated wireless channel the network performance for supporting VoIP traffic was found to gradually decrease proportional to the numbers of simultaneous VoIP calls rather than catastrophically collapse. There is also published research suggesting that the aggregation of packets can improve the efficiency of WLAN transmissions. An algorithm called Small Packet Aggregation for Wireless Networks (SPAWN) is also presented in this thesis to improve transmission efficiency of small voice packets in WLANs without introducing further delay to VoIP traffic. The evaluation result shows that after applying the SPAWN algorithm, the VoIP capacity of a single wireless channel can be extended up to 24 simultaneous calls.

Стилі APA, Harvard, Vancouver, ISO та ін.

Olsson, 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 джерела

Анотація:

The 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.

Стилі APA, Harvard, Vancouver, ISO та ін.

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 джерела

Анотація:

International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada
Wireless 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.

Стилі APA, Harvard, Vancouver, ISO та ін.

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 джерела

Анотація:

This 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.

Стилі APA, Harvard, Vancouver, ISO та ін.

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 джерела

Анотація:

This thesis focuses on utilization of ultra-wideband (UWB) technology for cognitive localization in the fifth generation (5G) wireless environment that envisages seamless global connection of ubiquitous devices. This suggests the need for cognitive high-definition location-aware networks and devices devoid of the drawbacks of current positioning systems. The thesis therefore models a cognitive UWB IEEE802.15.4a LOS sufficient technique (ULOSTECH); with a framework for optimal UWB localization channel that utilizes combined cluster decay rate and mistiming probability method that achieves over 90% realizations. Moreover, the ULOSTECH NLOS mitigation method achieves about 0.257 improvement ratio on the accuracy of cellular network localization methods. An impulse radio (IR)-UWB device-to-device (D2D) WWAN is further proposed with channel time partitioned into discrete micro-channel slots (DMCS) along with a cluster formation scheme that achieves above 350Mbps network throughput in comparison with 100Mbps cellular and 250Mbps wi-fi standards respectively. Additionally, the cluster cooperation method achieves multi-user access rate of over 485% above cellular network standards. Also proposed is the ULOSTECH D2D-propagation-based combined localization and communication scheme (UD-CLOCS) for ultra-dense networks. This utilizes cooperative D2D data hoping localization technique that achieves a mean distance error of 0.54 – 3.32 shorter than trilateration and multi-dimensional scaling (MDS) methods respectively. Finally, the thesis proposes an overall IR-UWB network layout for the 5G setting. This comprises an all-IP D2D UWB network overlay of concurrent multi-layered super-core architecture (5G-COMUSA). This is significant as the proposed solutions could serve to decongest the licensed spectrums in the 5G environment.

Стилі APA, Harvard, Vancouver, ISO та ін.

Shrestha, 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 джерела

Анотація:

University of Technology Sydney. Faculty of Engineering and Information Technology.
An 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.

Стилі APA, Harvard, Vancouver, ISO та ін.

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 джерела

Анотація:

Inom 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.

Стилі APA, Harvard, Vancouver, ISO та ін.

Більше джерел

Книги з теми "IEEE802.11.4"

Yŏn'guwŏn, Han'guk Chŏnja T'ongsin. 200Mbps-kŭp IEEE802.11n modem mit RF ch'ipset kaebal =: Development of IEEE802.11n modem and RF chip-sets with data rate 200Mbps. [Kyŏnggi-do Kwach'ŏn-si]: Chisik Kyŏngjebu, 2009.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

author, Iinatti Jari, and Mucchi Lorenzo editor, eds. Wireless UWB body area networks: Using the IEEE802.15.4-2011. Academic Press is an imprint of Elsevier, 2014.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Частини книг з теми "IEEE802.11.4"

Nam, Sung-wook, and Kwang-il Hwang. "Enhanced Beacon Scheduling of IEEE802.15.4e DSME." In Lecture Notes in Electrical Engineering, 495–503. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-017-8798-7_60.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Lee, Jong-hu, and Jae-cheol Ryou. "Strong User Authentication in IEEE802.11 Wireless LAN." In Web and Communication Technologies and Internet-Related Social Issues — HSI 2003, 638–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/3-540-45036-x_68.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Yang, Wei, Zhixiang Lai, JuanJuan Zheng, Yugen Yi, and Yuanlong Cao. "Secure Cluster-Wise Time Synchronization in IEEE802.15.4e Networks." In Computational Science and Its Applications – ICCSA 2018, 170–82. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-95174-4_14.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Krishnam Raju, K. V., and V. Valli Kumari. "Formal Verification of IEEE802.11i WPA-GPG Authentication Protocol." In Information Technology and Mobile Communication, 267–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-20573-6_44.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Al-Tarawneh, Luae’ A. "Medical Grade QoS Improvement Using IEEE802.11e WLAN Protocol." In Smart Technologies and Innovation for a Sustainable Future, 229–35. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-01659-3_26.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Ley-Bosch, Carlos, Roberto Medina-Sosa, Itziar Alonso-González, and David Sánchez-Rodríguez. "Implementing an IEEE802.15.7 Physical Layer Simulation Model with OMNET++." In Distributed Computing and Artificial Intelligence, 12th International Conference, 251–58. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19638-1_29.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Zou, Mengchuan, Jia-Liang Lu, Fan Yang, Mathilde Malaspina, Fabrice Theoleyre, and Min-You Wu. "Distributed Scheduling of Enhanced Beacons for IEEE802.15.4-TSCH Body Area Networks." In Ad-hoc, Mobile, and Wireless Networks, 3–16. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40509-4_1.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Kolahi, Samad S., Ahmad Khalid Sooran, Faroq Nasim, and Muhammad Mazhar U. Khan. "Performance Comparison of IEEE802.11ac vs IEEE 802.11n WLAN in IPv6." In Advanced Information Networking and Applications, 426–35. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75078-7_43.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Rademacher, Michael, Mathias Kretschmer, and Karl Jonas. "Exploiting IEEE802.11n MIMO Technology for Cost-Effective Broadband Back-Hauling." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 1–11. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-08368-1_1.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Kim, Se-Han, Kyo-Hoon Son, Byung-Chul Kim, and Jae-Yong Lee. "Design and Implementation of Greenhouse Control System Based IEEE802.15.4e and 6LoWPAN." In Lecture Notes in Electrical Engineering, 275–84. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-2598-0_29.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Тези доповідей конференцій з теми "IEEE802.11.4"

Bauwens, Jan, Bart Jooris, Peter Ruckebusch, Domenico Garlisi, Josesph Szurley, Marc Moonen, Spilios Giannoulis, Ingrid Moerman, and Eli De Poorter. "Coexistence between IEEE802.15.4 and IEEE802.11 through cross-technology signaling." In 2017 IEEE Conference on Computer Communications: Workshops (INFOCOM WKSHPS). IEEE, 2017. http://dx.doi.org/10.1109/infcomw.2017.8116433.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Ben Yaala, Sahar, and Ridha Bouallegue. "On MAC layer protocols towards internet of things: From IEEE802.15.4 to IEEE802.15.4e." In 2016 24th International Conference on Software, Telecommunications and Computer Networks (SoftCOM). IEEE, 2016. http://dx.doi.org/10.1109/softcom.2016.7772165.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Ali, Abdul Halim, Mohd Raziff Abd Razak, Nur Ayunie Mohd Hazman, NurFadlina Jafaar, Mohd Zaim, Mohd Jasmin, and Muzaiyanah Hidayab. "The comparison study of RF signal strength between IEEE802.11b/g and IEEE802.11n." In 2011 IEEE 3rd International Conference on Communication Software and Networks (ICCSN). IEEE, 2011. http://dx.doi.org/10.1109/iccsn.2011.6014975.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Pathak, Shailendra Kumar, Raksha Upadhyay, and Rajdeep Shrivastava. "Performance study of ad-hoc routing protocols for IEEE802.11 and IEEE802.11e standards." In 2012 Ninth International Conference on Wireless and Optical Communications Networks - (WOCN). IEEE, 2012. http://dx.doi.org/10.1109/wocn.2012.6335785.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Visoottiviseth, Vasaka, and Siwaruk Siwamogsatham. "End-to-end QoS-aware Handover in Fast Handovers for Mobile IPv6 with DiffServ using IEEE802.11e/IEEE802.11k." In 2008 10th International Conference on Advanced Communication Technology. IEEE, 2008. http://dx.doi.org/10.1109/icact.2008.4494074.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Margono, F. I., M. A. M. Zolkefpeli, and S. A. Shaaya. "Performance study on energy consumption and QoS of wireless sensor network under different MAC layer protocols: IEEE802.15.4 and IEEE802.11." In 2009 IEEE Student Conference on Research and Development (SCOReD). IEEE, 2009. http://dx.doi.org/10.1109/scored.2009.5443319.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Dalal, Hemin Nilesh, Nisarg V. Soni, and Abdul Razaque. "Header encryption of IEEE802.15.4." In 2016 IEEE Long Island Systems, Applications and Technology Conference (LISAT). IEEE, 2016. http://dx.doi.org/10.1109/lisat.2016.7494140.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Wu, Ling-Xi, and Jie Zhan. "Access Probability Analysis of IEEE802.15.4." In 2007 International Conference on Wireless Communications, Networking and Mobile Computing. IEEE, 2007. http://dx.doi.org/10.1109/wicom.2007.124.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Weiyong, Zhang, Zhang Fen, and Ma Xuesen. "A Clustering Algorithm Based on IEEE802.15.4." In 2007 Chinese Control Conference. IEEE, 2006. http://dx.doi.org/10.1109/chicc.2006.4347424.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Khoshdelniat, Reza, Gopinath Rao Sinniah, Khairina Abu Bakar, Mohd Hafiz Md Shaharil, Zeldi Suryady, and Usman Sarwar. "Performance evaluation of IEEE802.15.4 6LoWPAN gateway." In 2011 IEEE 17th Asia-Pacific Conference on Communications (APCC). IEEE, 2011. http://dx.doi.org/10.1109/apcc.2011.6152814.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Ми пропонуємо знижки на всі преміум-плани для авторів, чиї праці увійшли до тематичних добірок літератури. Зв'яжіться з нами, щоб отримати унікальний промокод!