PREFACE TO THE FIRST EDITION
Digitization is a technical trend in telecommunications as well as in other fields, for example, digital audio systems (compact disk) and digital control of machines. A digital approach enjoys higher accuracy and stability of the system over an analog system. Driving forces for digitization are VLSI (very large scale integrated) circuits and computers, which make it feasible to implement circuits required for the digitization of systems. In the telecommunications field, technological advances have been made on data and digital speech transmission on switched telephone networks, digital microwave communications, and digital fiber-optic communications. Digitization in mobile radio communications has lagged behind in comparison with these developments. However, in recent times, explosive activity in research and development of digital mobile communications seems yet to recover the delay in the digitization progress. This progress is further spurred by novel applications of digital mobile communications such as personal communication services, mobile computing, and mobile multimedia.
Some digital technologies can be applied in common to any field. However, some are not directly applicable because of differences in the requirements of a specific technical field. For mobile communications, robustness against fast fading, spectrum efficiency, power efficiency, and compactness and low price of equipment are essential. Digital modulation/demodulation is ...
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