Fundamentals of WiMAX: Understanding Broadband Wireless Networking ( Prentice Hall Communications Engineering and Emerging Technologies Series from. Fundamentals of WiMAX. Understanding Broadband Wireless Networking. Jeffrey G. Andrews, Ph.D. Department of Electrical and Computer Engineering. Fundamentals of WiMAX: Understanding Broadband Wireless Networking. by The University of Texas at Austin Jeffrey G. Andrews Ph.D. - Department of.
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Fundamentals of WiMAX: understanding broadband wireless networking PDF (probability density function) of Nakagami fading is parameterized by m and is. PDF | On Jan 1, , J. G. Andrews and others published Fundamentals of WiMAX: Understanding Broadband Wireless Networking. Fundamentals of WiMAX: Understanding Broadband Wireless Networking. Home · Fundamentals of WiMAX: Views 18MB Size Report. DOWNLOAD PDF.
SIMO - Branches 1 and 2 0. Such rate is low in this environment typically urban, in general, and the diversity technique is one of the possible solutions to increase it. With two omnidirectional antennas in the reception side, I and Q samples of the wideband signal were acquired independently at both diversity branches. By matched filtering of the complex signal measured, the power delay profiles were determined. Such results permit maximum transmission rates that vary from hundreds of kbps to some Mbps [ 17 ].
Terrestrial microwaves are in the low gigahertz range, which limits all communications to line-of-sight. Communications satellites — Satellites communicate via microwave radio waves, which are not deflected by the Earth's atmosphere. These Earth-orbiting systems are capable of receiving and relaying voice, data, and TV signals. Cellular and PCS systems use several radio communications technologies.
The systems divide the region covered into multiple geographic areas. Each area has a low-power transmitter or radio relay antenna device to relay calls from one area to the next area. Radio and spread spectrum technologies — Wireless local area networks use a high-frequency radio technology similar to digital cellular and a low-frequency radio technology.
Wireless LANs use spread spectrum technology to enable communication between multiple devices in a limited area. IEEE Free-space optical communication uses visible or invisible light for communications. In most cases, line-of-sight propagation is used, which limits the physical positioning of communicating devices.
Types of wireless networks[ edit ] Wireless PAN[ edit ] Wireless personal area networks WPANs connect devices within a relatively small area, that is generally within a person's reach.
The use of spread-spectrum or OFDM technologies may allow users to move around within a local coverage area, and still remain connected to the network.
Products using the IEEE Fixed wireless technology implements point-to-point links between computers or networks at two distant locations, often using dedicated microwave or modulated laser light beams over line of sight paths. It is often used in cities to connect networks in two or more buildings without installing a wired link.
To connect to Wi-Fi , sometimes are used devices like a router or connecting HotSpot using mobile smartphones. Wireless ad hoc network[ edit ] A wireless ad hoc network, also known as a wireless mesh network or mobile ad hoc network MANET , is a wireless network made up of radio nodes organized in a mesh topology. Each node forwards messages on behalf of the other nodes and each node performs routing.
Ad hoc networks can "self-heal", automatically re-routing around a node that has lost power. Various network layer protocols are needed to realize ad hoc mobile networks, such as Distance Sequenced Distance Vector routing, Associativity-Based Routing , Ad hoc on-demand Distance Vector routing , and Dynamic source routing.
These networks can be used to connect branch offices of business or as a public Internet access system. The wireless connections between access points are usually point to point microwave links using parabolic dishes on the 2.
A typical system contains base station gateways, access points and wireless bridging relays. Other configurations are mesh systems where each access point acts as a relay also. When combined with renewable energy systems such as photovoltaic solar panels or wind systems they can be stand alone systems.
In a cellular network, each cell characteristically uses a different set of radio frequencies from all their immediate neighbouring cells to avoid any interference. When joined together these cells provide radio coverage over a wide geographic area. This enables a large number of portable transceivers e. Although originally intended for cell phones, with the development of smartphones , cellular telephone networks routinely carry data in addition to telephone conversations: Global System for Mobile Communications GSM : The GSM network is divided into three major systems: the switching system, the base station system, and the operation and support system.
The cell phone connects to the base system station which then connects to the operation and support station; it then connects to the switching station where the call is transferred to where it needs to go.
GSM is the most common standard and is used for a majority of cell phones. Sprint happened to be the first service to set up a PCS. The newer GSM networks are replacing the older system.
Global area network[ edit ] A global area network GAN is a network used for supporting mobile across an arbitrary number of wireless LANs, satellite coverage areas, etc. The key challenge in mobile communications is handing off user communications from one local coverage area to the next.
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