By William Stallings
Back Cover wrote:
Best-selling writer, William Stallings, offers an up to date assurance of either instant communications and instant networks with new improved insurance of wireless and WiMax. Designed for college students and pros, this article explores the major networking subject matters with a different procedure protecting: know-how and structure, community layout ways, and kinds of networks and applications.
DISTINGUISHING KEY FEATURES
* offers a complete bankruptcy on unfold spectrum, that is pervasive in instant expertise today.
* additionally offers a whole bankruptcy on satellite tv for pc communications. This subject is still an incredible quarter inside instant communications.
* Thorough assurance of cordless platforms. this can be a fascinating and demanding new sector that extends the normal cordless mobile know-how over better distances and for better numbers of users.
* huge insurance of fastened instant entry, often referred to as instant neighborhood loop, and IEEE 802.16 criteria. This has turn into an important zone for bringing high-speed entry to subscribers instead of land lines.
* Devotes a complete bankruptcy on cellular IP instant program Protocol (WAP). instant web and internet entry are using forces within the evolution of instant know-how and are a needs to have.
* entire assurance of instant LANs, together with IEEE 802.11 and Bluetooth. this can be a large and demanding quarter, and the publication devotes 3 chapters to this realm.
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Additional info for Wireless Communications & Networks (2nd Edition)
Accordingly, we would like to make as efficient use as possible of a given bandwidth. For digital data, this means that we would like to get as high a data rate as possible at a particular limit of error rate for a given bandwidth. The main constraint on achieving this efficiency is noise. Nyquist Bandwidth To begin, let us consider the case of a channel that is noise free. In this environment, the limitation on data rate is simply the bandwidth of the signal. i\LS this limitation, due to Nyquist, states that if the rate of signal transmission is 2B, then a signal with frequencies no greater than B is sufficient to carry the signal rate.
We list here some representative reasons: .. Digital data, digital signal: In general, the equipment for encoding digital data into a digital signal is less complex and less expensive than digital-toanalog equipment. Analog data, digital signal: Conversion of analog data to digital form permits the use of modern digital transmission and switching equipment for analog data. 1 Analog and Digital Transmission (a) Data and Signals Analog Signal Analog Data Two alternatives: (l)signal occupies the same spectrum as the analog data; (2) analog data are encoded to occupy a different portion of spectrum.
Signals entering the network from a station are routed to the destination by being switched from node to node. For example, information from station A intended for station F is sent to node 4. It may then be routed via nodes 5 and 6 or nodes 7 and 6 to the destination. Several observations are in order: 1. , 5 and 7). Their sole task is the internal (to the network) switching of information. Other nodes have one or more stations attached as well; in addition to their switching functions, such nodes accept information from and deliver information to the attached stations.
Wireless Communications & Networks (2nd Edition) by William Stallings