Download Mobile WiMAX: toward broadband wireless metropolitan area by Yan Zhang, Hsiao-Hwa Chen PDF

By Yan Zhang, Hsiao-Hwa Chen

The instant Metropolitan quarter community (WirelessMAN) is a promising Broadband instant entry (BWA) know-how that gives high-speed, high-bandwidth potency and high-capacity multimedia providers for either residential and firm purposes. cellular WiMAX: towards Broadband instant Metropolitan region Networks examines the fundamental strategies, fresh advances, and newest usual standards pertinent to WirelessMANs, putting emphasis on IEEE 802.16-based WiMAX. After introducing the fundamentals of WirelessMAN, the ebook addresses themes in 3 obtainable elements. the 1st half makes a speciality of radio frequency (RF), sign processing, a number of in-multiple out (MIMO) know-how, and picking out demanding situations and attainable options within the actual layer. An exam of protocol concerns follows, together with these regarding medium entry keep an eye on (MAC), caliber of carrier (QoS) in point-to-multi-point (PMP) and mesh networks, move layer optimization, mobility administration, handoff in heterogeneous networks, power administration, and hyperlink version mechanisms. the ultimate half considers concerns relating to safety, financial system, and process capability within the WiMAX. cellular WiMAX: towards Broadband instant Metropolitan zone Networks is a crucial source for these drawn to figuring out all facets proper to the technical, sensible, financial, and coverage concerns relating WirelessMANs. It deals complete sensible and technical suggestions at the basics and up to date advances generally WirelessMAN, in addition to the newest commonplace standards in IEEE 802.16a/c/d/e households.

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These satellites can, therefore, rely mostly on solar power and not on batteries; they are useful for agriculture, oceanography, forestry, hydrology, geology, cartography, and meteorology. 3 Medium Earth Orbits (MEO)/Intermediate Circular Orbits These are circular orbits at an altitude of around 10,000 km. Their orbit period is in the range of 6 hr. The maximum period a satellite in MEO is above the local horizon for an observer on the earth is in the order of a couple of hours. A global communications system using this type of orbit requires a small number satellites in two or three orbital planes to achieve global coverage.

Typically, such a satellite moves at an altitude of 1000 km [GEO200101]. A value, expressed in Kelvins, that accounts for the noise contribution of all components in the earth station’s receive chain. Often depicted as Ts or Tsys. A high-power amplifier based on vacuum-tube technology. Normally employed when high output power levels and wide bandwidths are required. Typically used on board satellites and often in earth stations. A device for converting the frequency of a signal into a higher frequency.

The degree of attenuation may be fixed, continuously adjustable, or incrementally adjustable. Fixed attenuators are often called pads, especially in telephony. Note: The input and output impedances of an attenuator are usually matched to the impedances of the signal source and load, respectively. The amount by which the signal power is reduced is usually expressed in dB [ANS200001]. The ratio of the total time a functional unit is capable of being used during a given interval to the length of the interval.

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