first two chapters. Chapter 1 first reviews the wireless evolution by looking at two major
applications: cellular networks and TV broadcast networks. Then the discu ssion of
Chapter 1 focuses on some key techniques including multiple-input multiple-output
(MIMO) technique, OFDM, and cognitive radio. The purpose of Chapter 2 is mainly
to provide an overview of the basic principles and proto cols of digital transmission in
wireless networks. The emphasis o f this chapter is on transmission over MIMO networks
with space-time and space-frequency transmission techniques being presented in align-
ment with the WCDMA/OFDMA physical layer protocols.
Chapter 3 is devoted to the front-end and system overvi ew of broadband wireless
communications. Firstly digital front-end and its key processing units are reviewed. Then
this chapter presents new objectives and technologies for transmission and reception of
modern wireless communication systems with emphasis on the front-end part. In partic-
ular, this chapter introduces some recent mobile communications standards, suitable for
SDR developments because of their novelty and capability of reconfiguration including
the standards in development under the umbrella of the IMT-Advanced Program. Also,
this chapter addresses some new standards on the basis of cognitive radio strategies.
More importantly, this chapter focuses on various aspects of how to design and imple-
ment digital front-end, covering transceivers and related power ampl ifiers, chip circuits,
and their hardware processing platforms.
Chapter 4 presents a system overview and front-end technologies in digital broad-
casting. Concepts such as multicast, return channel, video quality, and transcoding are
presented in the context of broadcast mobile multimedia services, covering common
modulation technologies, different alternatives for audio and video coding, most relevant
standards, and proprietary systems for digital multimedia broadcasting. However, the
emphasis of this chapter is on key technologies such as analog-to-digital conversion
(ADC), digital-to-analog convers ion (DAC), DDC, DUC, and power amplifier lineariza-
tion for digital front-end processing in broadcast transmission and reception.
Digital front-end processing has begun to play an increasingly important role in wireless
communication and broadcasting systems to support multiple standards and multimode
compatibility, which is the focus of Chapter 5. In this chapter, an overview of the key
structures of digital front-end for multiple bands and multiple modes is first presented.
Then, this chapter outlines some important aspects regarding the analog-to-digital con-
version for multimode and multiband applications as well as the preselect filters and low-
noise amplifier (LNA) interface in multimode-multiband transmitters. Power amplifier
architectures in multiple standards are also addressed at the end of this chapter.
Part II DPD and CFR
Six chapters in Part II mainly deal with principles, theory, algorithms, circuit designs, and
hardware implementations on various computin g platforms for digital predistortion and
crest factor reduction so as to compensate for power amplifier nonlinearities and to
reduce peak-to-average power ratio. With a tutorial style, Chapter 6 presents general
principles and design overview of digital predistortion techniques. Chapter 6 first reviews
xviii Preface