RF System Design of Transceivers for Wireless Communications
Addressing specifications that are critical for the design process, this book develops systematic methods for RF systems design, complete with a comprehensive set of design formulas.
TABLE OF CONTENTS RF System Design of Transceivers for Wireless Communications
Chapter 1: Introduction
1.1. Wireless Systems
In wireless systems, the connection between equipments, such as a mobile station and a base station, is by means of electromagnetic waves instead of a cable or a wire. In this sense, optical and infrared communications systems are also wireless systems. However, the wireless systems discussed in this book are only those based on the connection medium of radio frequency ( RF) electromagnetic waves. The present practicable limits of radio frequency are roughly 10 kHz to 100 GHz [1]. Wireless systems at present commonly operate in hundreds MHz or a few GHz frequency. Electromagnetic waves with a frequency in these regions have a propagation distance with an acceptable attenuation and a good penetrating capability through buildings and vehicles and are able to carry wide-band signals.
1.1.1. Mobile Communications Systems
Mobile communications started in 1920s, but the real mobile communication era began in the early 1980s. The cellular mobile system, advanced mobile phone service ( AMPS), first operated for commercial telecommunication service in the United States in 1983. All the first-generation mobile communications systems including AMPS, TACS ( total access communications system) in the U.K., NTT ( Nippon Telephone and Telegraph) systems in Japan, and NMT ( Nordic Mobile Telephones) in Europe are analog systems.
The second-generation mobile systems digital mobile systems were introduced in late 1980s. There are several competing worldwide digital standards, such as the global system for mobile communications ( GSM), IS-95/98 code-division multiple-access system
Copyright Springer Science+Business Media, Inc. 2005 under license agreement with Books24x7
