CDMA RF System Engineering

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【文件名】:06820@52RD_CDMA RF System Engineering.pdf
【格　式】:pdf
【大　小】:955K
【简　介】:
【目　录】:


Preface
The wireless communications industry has been undergoing tremendous
changes in the last few years. With the auction of personal communication
services (PCS) licenses in the United States, most incumbent service providers
found themselves competing with not just one, but several other service providers
who offered comparable services at competitive prices. At the same time,
the wireless subscriber base has been increasing as well, with some projecting
the total number of worldwide wireless subscribers reaching over 360 million
by year 2000.
The tremendous market growth coupled with fierce competition implies
that each service provider must differentiate itself from the competitors by
offering a high-quality service at a competitive price. From an engineering perspective,
the first goal may be attained by optimally designing and maintaining
the network such that the customer’s calling experience nearly replicates that of
a landline phone. The second goal may be achieved by effectively and efficiently
planning, managing, and operating network resources. For many service
providers, code division multiple access (CDMA) manifested in the form of a
IS-95 wideband spread-spectrum system has played a key role in achieving both
goals. Many technical features of CDMA, which this book describes in detail,
enable the network to offer high-quality on-demand voice services to customers.
At the same time, CDMA’s ability to provide high capacity allows a service
provider to better utilize its invested network assets, lower its cost structure,
and thus lower its service pricing.
In an effort to provide radio frequency (RF) and system engineers with the
ability to optimally engineer and manage an IS-95 based network as well as to
provide students with an inclusive treatment of spread-spectrum technology,
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this book has been written to give a comprehensive coverage of CDMA RF system
engineering. The book emphasizes both theoretical and application aspects
of code division as specifically applied to engineering a land-mobile network.
The intended audience is practicing engineers and managers, senior-level
undergraduates, and first-year graduate students.
To the extent possible, the relationship between general areas of digital
communication and specific features of IS-95 is emphasized in the book. Other
areas of land-mobile communications engineering, such as network management
and traffic engineering, are also treated, with an emphasis on CDMA
application. Furthermore, the chapters are modularized so the readers can read
only those sections that are relevant to his or her needs. The book develops the
idea of CDMA communication in the context of a land-mobile wireless network.
To that end, the book is organized as follows.
Chapter 1 starts with a brief introduction of multiple access using directsequence
spread-spectrum techniques. Multiple access is illustrated with the
use of orthogonal codes, and some inherent benefits and difficulties of
direct-sequence spread spectrum in a mobile communications environment are
addressed. Chapter 2 reviews radio propagation from the perspectives of static
and dynamic effects (i.e., path loss as well as shadowing and multipath
phenomena).
The material on communication engineering of a CDMA network begins
in Chapter 3 with a review of the fundamentals of digital communications; the
chapter emphasizes only those aspects of digital communication applicable to
an IS-95 based system. Chapter 4 introduces and describes the fundamental
and theoretical concepts of spread-spectrum communication, while Chapters
5 and 6 describe the channel structure and call processing functions of an
IS-95 based system. These three chapters serve as the background and foundation
leading into the chapters that follow: Chapters 7 and 8 cover the essential
materials of design and performance engineering of a CDMA network.
In migrating from an AMPS to a CDMA system, the cellular engineering
paradigm effectively shifts from frequency planning to noise management,
since every decibel of in-band noise reduced translates into capacity and coverage
gains. The goal of Chapter 9 is to cover those special areas to which RF and
system engineers should pay special attention in order to reduce in-band noise.
Chapters 10, 11, and 12 contain special topics relevant to the operation
and management of a CDMA network, such as traffic engineering, network
management, and regulatory compliance issues.
At this point, a few words about the design of this book’s cover are
probably in order. The cover is an illustration of four superimposed layers, each
representing a different aspect of CDMA technology. The first layer is a rigid
matrix of hexagons which symbolizes the conventional analog cellular
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technology. The second layer depicts the technical aspects of CDMAimportant
equations and operating frequencies, the third layer shows 14 hexagonal
volumes portraying breathing CDMA cells with different capacities.

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【精华】 UC Berkeley: Structure and Interpretation of Signals and Systems
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