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Wireless communication is one of the most vibrant areas in the commu- nication field today. While it has been a topic of study since the s, the past decade has seen a surge of research activities in the area. This is due to a confluence of several factors.

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First, there has been an explosive increase in demand Wureless tetherless connectivity, driven so far mainly by cellu- lar telephony but expected to be soon eclipsed by wireless Cyapter applications. Second, the dramatic progress in VLSI technology has enabled small-area and low-power implementation of sophisticated signal processing algorithms and coding techniques. Third, the success of second-generation 2G digital wireless standards, in particular, the IS Code Division Multiple Access CDMA standard, provides a concrete demonstration that good ideas from communication theory can have a significant impact in practice. Cambridge University Press. All rights reserved. There are two fundamental aspects of wireless communication that make the problem challenging and interesting. These aspects are by and large not as significant in wireline communication. First is the phenomenon of fading: the time variation of the channel strengths due to the small-scale effect of multipath fading, as well as click effects such as path loss via dis- tance attenuation and shadowing by obstacles.

Second, unlike in the wired world where each transmitter—receiver pair can often be thought of as an isolated point-to-point link, wireless users communicate over the air and there is significant interference between them. The interference can be between transmitters communicating with a common receiver e. How to deal with fad- ing and with interference is central to the design of wireless communication Tse, David, and Pramod Viswanath. Created from lpu-ebooks on Although this book takes a physical-layer perspective, it will be seen that in fact the management of Woreless and interference has ramifications Chapter 1 Introduction 1 1 Background Wireless multiple layers.

Traditionally the design of wireless systems has focused on increasing the reliability of the air interface; in this context, fading and interference are viewed as nuisances that are to be countered.

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Recent focus has shifted more towards increasing the spectral efficiency; associated with this shift is a new point of view that fading can be viewed as an opportunity to be exploited. The main objective of the Wirelesa is to provide a unified treatment of wireless communication from both these points of view. In addition to traditional topics such as diversity and interference https://amazonia.fiocruz.br/scdp/essay/mormon-bank-utah/analysis-of-the-article-power-privilege-and.php, a substantial portion of the book will be devoted to more modern topics such as opportunistic Chapter 1 Introduction 1 1 Background Wireless multiple input multiple Backgroudn MIMO communication.

An important component of this book is the system view emphasis: the successful implementation of a theoretical concept or a technique requires an understanding of how it interacts with the wireless system as a whole. Unlike the derivation of a concept or a technique, this system view is less malleable to mathematical formulations https://amazonia.fiocruz.br/scdp/essay/pathetic-fallacy-examples/the-effect-on-climate-change.php is primarily acquired through experience with designing actual wireless systems.

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We try to help the reader develop some of this intuition by giving numerous examples of how the concepts are applied in actual wireless systems. Five examples of wireless systems are used. The next section gives some sense of the scope of the wireless systems considered in this book. Byradio reception across the Atlantic Ocean had been established; thus, rapid progress in technology has also been around for quite a while. In the intervening hundred years, many types of wireless systems have flourished, and often later disappeared.]