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Introduction to Digital Mobile Communication, 2nd Edition by Yoshihiko Akaiwa

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PREFACE TO THE SECOND EDITION

It has been 17 years since the publication of this book in 1997. The progress of technology and penetration of services in the digital mobile communications field, especially in cellular systems, is much faster than I expected. In general, the mobile radio communication services are widely accepted as the wireline internet services of the world. My intention of rewriting this book is to provide an update on new technologies. However, technology is evolving so rapidly that it is difficult to fulfill this. Therefore, this book might need to be updated regularly to be in pace with the technology.

The central motive force for technological progress in the mobile radio field has been the digitization of communications to provide digital communication services including digital voice, message, and mobile internet (data) services. In physical layer technologies for cellular systems, digital modulation and multiplexing schemes abandoned the use of constant envelope signals, since spectrum efficiency with non-constant envelope signals is given a higher priority than power efficiency with the constant envelope signals. In this scenario, linear modulations, code-division multiplexing, and the latest orthogonal frequency multiplexing are developed. To make these techniques more feasible, radio frequency (RF) devices with a nonlinearity compensation technique to get simultaneously a high linearity and power efficiency appeared. Together with the high spectrum ...

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