Multi-Carrier Digital Communications
Theory and Applications of OFDM, Second Edition
Multi-carrier modulation, Orthogonal Frequency Division
Multiplexing (OFDM) particularly, has been successfully applied to
a wide variety of digital communications applications over the past
several years. OFDM has been chosen as the physical layer standard
for a variety of important systems and its implementation
techniques continue to evolve rapidly. This book is a valuable
summary of the technology, providing an understanding of new
advances as well as the present core technology.
A unified presentation of OFDM performance and implementation
over a wide variety of channels, including both wireline and
wireless systems, is made. This will prove valuable both to
developers of such systems and to researchers and graduate students
involved in analysis of digital communications.
In the interest of brevity, the authors have minimized treatment
of more general communication issues. There exist many excellent
texts on communication theory and technology. Only brief summaries
of topics not specific to multi-carrier modulation are presented in
this book where essential. As a background, it is assumed that the
reader has a clear knowledge of basic fundamentals of digital
communications.
Highlights of the Second Edition
During the past few years since the publication of the first
edition of this text, the technology and application of OFDM have
continued their rapid pace of advancement. As a result, it became
clear that a new edition of the text would be highly desirable. The
new edition provides the opportunity to make those corrections and
clarifications whose needbecame apparent from continued discussions
with many readers. However, the main purpose is to introduce new
topics that have come to the forefront during the past few years,
and to amplify the treatment of other subject matter.
Because of the particularly rapid development of wireless
systems employing OFDM, the authors introduced a section early in
the text on wireless channel fundamentals. They have extended and
modified their analysis of the effects of clipping, including new
simulation results. A section of channel estimation has been added
to the chapter on equalization. The chapter on local area networks
has been greatly expanded to include the latest technology and
applications. Three totally new chapters are added, on OFDM
multiple access technology, on ultra wideband technology, and on
WiMAX (IEEE 802.16).
Organization of This Book
The authors begin with a historical overview of multi-carrier
communications, wherein its advantages for transmission over highly
dispersive channels have long been recog-nized, particularly before
the development of equalization techniques. They then focus on the
bandwidth efficient technology of OFDM, in particular the digital
signal processing techniques that have made the modulation format
practical. Several chapters describe and analyze the sub-systems of
an OFDM implementation, such as clipping, synchronization channel
estimation, equalization, and coding. Analysis of performance over
channels with various impairments is presented.
The book continues with descriptions of three very important and
diverse applications of OFDM that have been standardized and are
now being deployed. ADSL provides access to digitalservices at
several Mbps over the ordinary wire-pair connection between
customers and the local telephone company central office. Digital
broadcasting enables the radio reception of high-quality digitized
sound and video. A unique configuration that is enabled by OFDM is
the simultaneous transmission of identical signals by
geographically dispersed transmitters. And, the new development of
wireless LANs for multi-Mbps communications is presented in detail.
Each of these successful applications required the development of
new fundamental technology.
Finally, the book concludes with describing the OFDM based
multiple access techniques, ultra wideband technology and
WiMAX.
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