tailieunhanh - GSM, cdmaOne and 3G Systems

Tham khảo sách 'gsm, cdmaone and 3g systems', kỹ thuật - công nghệ, kĩ thuật viễn thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | GSM cdmaOne and 3G Systems P5 y V Ạ GSM cdmaOne and 3G Systems. Raymond Steele Chin-Chun Lee and Peter Gould Copyright 2001 John Wiley Sons Ltd Print ISBN 0-471-49185-3 Electronic ISBN 0-470-84167-2 Chapter 1 Introduction to Cellular Radio This book is concerned with two digital mobile radio systems the global system for mobile communications GSM and a code division multiple access CDMA system that was originally known as the American interim standard 95 or IS-95 and is now called cd-maOne 1-7 . While GSM was conceived and developed through the concerted efforts of regulators operators and equipment manufacturers in Europe cdmaOne owes its existence to one dynamic Californian company Qualcomm Inc. The authors have been involved with both the pan-European mobile radio system which became GSM and the Qualcomm CDMA system for a number of years. The GSM system predates cdmaOne. The two systems are very different. The radio interface of GSM relies on time division multiple access TDMA which means that its radio link is very different to that of cd-maOne. Also GSM is a complete network specification from the subscriber unit through to the network gateway. Indeed its fixed network component is perhaps its most advanced feature 1 2 . cdmaOne by contrast has a more complex and advanced radio interface and only later were fixed network issues addressed 3 7 . In the chapters to follow the GSM and cdmaOne systems will be described and analysed while the final chapter deals with their evolution to third generation systems. This chapter is meant to provide background information on cellular radio 1-11 . The reader who is well acquainted with the fundamentals of mobile radio communications should therefore bypass this chapter. For the reader who has elected to read this chapter we should state at the outset that our goal is to provide a clear exposition of the concepts of the subject rather than detailed analyses which will follow in the later chapters. The first point to make is