Wireless characteristics

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  • This book provides a comprehensive introduction to the underlying theory, design techniques and analytical tools of wireless communications, focusing primarily on the core principles of wireless system design. The book begins with an overview of wireless systems and standards. The characteristics of the wireless channel are then described, including their fundamental capacity limits. Various modulation, coding, and signal processing schemes are then discussed in detail, including state-of-the-art adaptive modulation, multicarrier, spread spectrum, and multiple antenna techniques....

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  • Wireless sensor networks promise an unprecedented fine-grained interface between the virtual and physical worlds. They are one of the most rapidly developing new information technologies, with applications in a wide range of fields including industrial process control, security and surveillance, environmental sensing, and structural health monitoring. This book is motivated by the urgent need to provide a comprehensive and organized survey of the field.

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  • In the past three decades there were big social, economic and technological changes in the world. Scientific and technological advancement, informing of wide circle of people and their inclusion in the learning process are the main characteristics of this period. In such conditions, the need came up for exchanging different kind of messages, i.e. transmission of different kind of signals, governing the extremely fast development of the telecommunications systems.

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  • Wireless LAN: General Characteristics / IEEE 802.11 standard, IEEE 802.11 Physical Layers, Medium Access Control, MAC Frame Format, MAC Management, IEEE 802.11: Important Developments.

     

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  • Outline of lecture 8: bluetooth has general characteristics, piconets & scatternets, basic access scheme, baseband (mac layer), higher layer protocols, profiles and versions; zigbee has zigbee vs. IEEE 802.15.4, architecture & topologies, IEEE802.15.4 MAC  layer.

     

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  • Mobile network operators will meet many challenges in the coming years. It is expected that the number of people connected, wireline and wireless, will reach five billion by 2015. At the same time, people use more wireless services and they expect similar user experience to what they can now get from fixed networks. Because of that we will see a hundred-fold increase in network traffic in the near future. At the same time markets are saturating and the revenue per bit is dropping.

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  • Guided - wire Unguided - wireless Characteristics and quality determined by medium and signal For guided, the medium is more important For unguided, the bandwidth produced by the antenna is more important Key concerns are data rate and distance

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  • The demand of transmission of images and video is increasing quickly recently and researchers are trying to invest good solutions to improve the quality of these over wireless networks. There are still challenges due to the different characteristics and quality of images between wired and wireless channels. An important issue is congestion control to ensure network stability and achieve a reasonably fair distribution of the network resources among the users.

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  • 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: On the Geometrical Characteristics of Three-Dimensional Wireless Ad Hoc Networks and Their Applications

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  • Bài giảng Computer Networks 1 (Mạng Máy Tính 1): Lecture 4 của Dr. Phạm Trần Vũ trình bày về Wireless and Mobile Networks bao gồm những nội dung về Wireless and Mobile Networks, Elements of a wireless network, Characteristics of selected wireless link, Wireless network taxonomy,...

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  • Chapter 10 - Local area networks part 2: Wireless and Virtual LANs. After reading this chapter, the reader should be able to: Understand the different transmission techniques used in wireless LANs, understand the main characteristics of IEEE 802.11 wireless LANs, understand the applications of IEEE 802.11, understand the characteristics of 802.15 LANs and the Bluetooth technology that implements this standard.

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  • While coding and signal processing are key elements to successful implementation of a MIMO system, the communication channel represents a major component that determines system performance. A considerable volume of work has been performed to characterize communication channels for general wireless applications. However, because MIMO systems operate at an unprecedented level of complexity to exploit the channel space-time resources, a new level of understanding of the channel space-time characteristics is required to assess the potential performance of practical multiantenna links....

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  • Explain the role of Physical layer protocols and services in supporting communication across data networks. – Describe the role of signals used to represent bits as a frame as the frame is transported across the local media Describe the purpose of Physical layer signaling and encoding as they are used in networks Identify the basic characteristics of copper, fiber and wireless network media Describe common uses of copper, fiber and wireless network media

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  • 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.

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  • Modern communication systems require radio frequency and microwave signals for the wireless transmission of information. These systems employ oscillators, mixers, ®lters, and ampli®ers to generate and process various kinds of signals. The transmitter communicates with the receiver via antennas placed on each side. Electrical noise associated with the systems and the channel affects the performance. A system designer needs to know about the channel characteristics and system noise in order to estimate the required power levels....

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  • Compressed video streams are intended for transmission over communication networks. With the advance of multimedia systems technology and wireless mobile communications, there has been a growing need for the support of multimedia services such as mobile teleconferencing, telemedicine, mobile TV, distance learning, etc., using mobile multimedia technologies. These services require the real time transmission of video data over fixed and mobile networks of varying bandwidth and error rate characteristics....

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  • Transmission Basics and  Networking Media Explain basic data transmission concepts, including full duplexing, attenuation, and noise Describe the physical characteristics of coaxial cable, STP, UTP, and fiber-optic media Compare the benefits and limitations of different networking media Identify the best practices for cabling buildings and work areas Specify the characteristics of popular wireless transmission methods, including 802.11, infrared, and Bluetooth

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  • Topologies and Access Methods Describe the basic and hybrid LAN physical topologies, and their uses, advantages and disadvantages Describe the backbone structures that form the foundation for most LANs Compare the different types of switching used in data transmission Understand the transmission methods underlying Ethernet, Token Ring, FDDI, and ATM networks Describe the characteristics of different wireless network technologies, including Bluetooth and the three IEEE 802.11 standards

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  • WANs, Internet Access, and Remote Connectivity Identify a variety of uses for WANs Explain different WAN topologies, including their advantages and disadvantages Describe different WAN transmission and connection methods, including PSTN, ISDN, T-carriers, DSL, broadband cable, SONET, and wireless Internet access technologies Compare the characteristics of WAN technologies, including throughput, security, and reliability Describe the software and hardware requirements for remotely connecting to a network...

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  • Simulation of Wireless Network Systems This chapter deals with simulation of wireless network systems. We introduce the basics of discrete-event simulation as it is the simulation technique that is used for simulating wireless networks. We then review the main characteristics of the commonly used stochastic distributions used for the simulation of wireless networks. The techniques used to generate and test random number sequences are investigated. Then, we introduce the techniques used to generate random variates followed by performance metrics considerations.

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