Wireless data networks

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  • The expansion and popularity of the Internet, along with the addition of wireless data functionality to wireless networks, has also contributed greatly to the growth of the wireless industry. In fact, the anticipated consumer demand for high bandwidth wireless data is commonly seen as the driving force behind current network upgrades and expansions. The number and types of companies aggressively investing in wireless technologies illustrate the importance of wireless data.

    pdf234p ken333 14-06-2012 92 28   Download

  • Wireless Sensor Networks (WSNs) can be defined as a self-configured and infrastructure-less wireless networks to monitor physical or environmental conditions, such as temperature, sound, vibration, pressure, motion or pollutants and to cooperatively pass their data through the network to a main location or sink where the data can be observed and analysed. A sink or base station acts likean interface between users and the network. One can retrieve required information from the network by injecting queries and gathering results from the sink.

    pdf319p namde01 11-04-2013 98 19   Download

  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Adaptive Cross-Layer Distributed Energy-Efficient Resource Allocation Algorithms for Wireless Data Networks

    pdf14p dauphong16 20-02-2012 37 2   Download

  • This paper presents a low power Wireless Sensor Network using TCP/IP to use Ethernet configuration and hybrid networks to extend range or improve connectivity in distant areas, in particular is Agriculture. The system is designed with soil moisture sensor based on Atmega8L to monitor environmental parameter. The Nordic nRF24L01 was used to transmit the obtained data to the Web server based on Ethernet configuration. Moreover, the SIM800L module was used to upload these data based on GSM/GPRS service in order to make data available globally.

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  • This module introduces the Wireless LAN (WLAN) industry. It is designed to give the student a brief overview of the history of WLAN products and the evolution of those products, as well as to help the learner understand the development history of Cisco Aironet® wireless product set. It includes the following topics: Agenda Cisco Wireless Wireless Data Networks WLAN Evolution Cisco Wireless Advantages

    pdf590p vutrung 04-09-2009 165 60   Download

  • Wireless sensor nodes are small, embedded computing devices that interface with sensors/ actuators and communicate using short-range wireless transmitters. Such nodes act autonomously, but cooperatively to form a logical network, in which data packets are routed hop-by-hop towards management nodes, typically called sinks or base stations. A Wireless Sensor Network (WSN) comprises of a potentially large set of nodes that may be distributed over a wide geographical area, indoor or outdoor

    pdf369p nghiasimon 22-09-2012 59 21   Download

  • Nortel is a recognized leader in delivering communications capabilities that enhance the human experience, ignite and power global commerce, and secure and protect the world’s most critical information. Serving both service provider and enterprise customers, Nortel delivers innovative technology solutions encompassing end-to-end broadband, Voice over IP, multimedia services and applications, and wireless broadband designed to help people solve the world’s greatest challenges.

    pdf110p hoangtumayman 14-05-2010 83 12   Download

  • These CHs gather data from their local clusters aggregate them & send them to the base station. On the LEACH many new schemes have been proposed to enhance its activity like its efficiency, security etc. In this paper the fault tolerance issue is being incorporated.

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  • The proposed architecture strives to resolve the conflicts between the untraceability and traceability objectives, in addition to guaranteeing fundamental security requirements including authentication, confidentiality, efficiency, data integrity, and non-repudiation . Thorough analysis on security and efficiency is incorporated, demonstrating the feasibility and effectiveness of the proposed architecture.

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  • The location of sensor nodes is necessarily predefined and not known. Such a feature allows us to release them in hazardous or inaccessible places. Another unique feature of sensor networks is the ability to collaborate and coordinate sensor nodes. Each node of the sensor has a processor on its board, and if it uses related algorithms, instead of sending all the raw data to the center, it first performs its initial and simple processing on them and then sends the semi-processed data.

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  • The Nearest Neighbour Search is one of these techniques. It uses the Euclidean or Mahalanobis distance for detecting outliers in a given sensor networks. In this paper, we proposed a distributed adaptive approach for the detection of outliers. The proposed approach is based on Euclidean or Mahalanobis distance, depending on the size of the data collected. Extensive experiments have been conducted and the results confirmed the effectiveness of the proposal.

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  • A video data sampling and transmission system is designed for video monitoring based on wireless mesh network. Discussion is made on the use of standards, working frequency, network infrastructure, coverage solutions, link budget, frequency planning, power supply, supporting transmission and AC design.

    pdf8p vivalletta2711 11-01-2020 8 0   Download

  • This research not only introduced the reference hardware of a sensor node in wireless sensor networks but also conducted experiments on typical LoRaTM network infrastructure. We conduct three different experiments to validate our proposed algorithm with real systems which use air quality sensors and an ultra-low-power micro-controller unit board from Texas instruments.

    pdf12p trinhthamhodang9 04-12-2020 4 0   Download

  • In this paper, we provide analyses performance of IEEE 802.11, 802.15.4 MAC and S-MAC protocols in terms of throughput, energy consumption and data packet delivery. Our simulation results show that S-MAC protocol with active and sleep cycle consumes energy less than about 10% and 15% compared to IEEE 802.15.4 and IEEE 802.11 MAC protocols respectively.

    pdf7p chauchaungayxua11 23-03-2021 4 0   Download

  • Over the past few years, many fundamental changes have taken place in wireless communications that will influence the future of this dynamic field. One phenomenon driving these changes has been the integration of wireless communicationdevices in people’s lives. While the 1990s were the years when wireless voice telephony became popular, the 2000s should be the time when wireless data applications are truly un-tethered from homes and offices. As more people adopt wireless communication devices and applications effected by these devices, the demand on wireless networks will continue to grow..

    pdf280p thaudiennhe 10-07-2010 166 78   Download

  • I would like to dedicate this work to three very special people who have had a profound impact in my life and in the creation of this work. To Dana Axinger, whose quest for knowledge was the greatest driving factor towards the development of this work.

    pdf255p conrepcon 12-04-2012 104 38   Download

  • Physical Layer. In this chapter, you will learn to: Explain the role of Physical layer protocols and services in supporting communication across data networks. Describe the purpose of Physical layer signaling and encoding as they are used in networks. Describe the role of signals used to represent bits as a frame is transported across the local media. Identify the basic characteristics of copper, fiber, and wireless network media.

    pdf42p thanhtung_hk 03-11-2010 119 22   Download

  • Mobile and Wireless Communications have been one of the major revolutions of the late twentieth century. We are witnessing a very fast growth in these technologies where mobile and wireless communications have become so ubiquitous in our society and indispensable for our daily lives. The relentless demand for higher data rates with better quality of services to comply with state-of-the art applications has revolutionized the wireless communication field and led to the emergence of new technologies such as Bluetooth, WiFi, Wimax, Ultra wideband, OFDMA.

    pdf0p 123859674 30-06-2012 74 18   Download

  • Transmission Basics In data networking, transmit means to issue signals to the network medium Transmission refers to either the process of transmitting or the progress of signals after they have been transmitted

    ppt51p doanhung_dtvtk10 19-03-2013 65 9   Download

  • Since the fi nal decades of the twentieth century, data networks have known steadily growing success. After the installation of fi xed Internet networks in many places all over the planet and their now large expansion, the need is now becoming more important for wireless access. There is no doubt that by the end of the fi rst decade of the twentieth century, high-speed wireless data access, i.e. in Mb/s, will be largely deployed worldwide.

    pdf261p tailieuvip13 19-07-2012 51 6   Download



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