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1 - Introduction

Published online by Cambridge University Press:  28 February 2011

Farooq Khan
Affiliation:
Samsung Telecommunications America, Richardson, Texas
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Summary

The cellular wireless communications industry witnessed tremendous growth in the past decade with over four billion wireless subscribers worldwide. The first generation (1G) analog cellular systems supported voice communication with limited roaming. The second generation (2G) digital systems promised higher capacity and better voice quality than did their analog counterparts. Moreover, roaming became more prevalent thanks to fewer standards and common spectrum allocations across countries particularly in Europe. The two widely deployed second-generation (2G) cellular systems are GSM (global system for mobile communications) and CDMA (code division multiple access). As for the 1G analog systems, 2G systems were primarily designed to support voice communication. In later releases of these standards, capabilities were introduced to support data transmission. However, the data rates were generally lower than that supported by dial-up connections. The ITU-R initiative on IMT-2000 (international mobile telecommunications 2000) paved the way for evolution to 3G. A set of requirements such as a peak data rate of 2 Mb/s and support for vehicular mobility were published under IMT-2000 initiative. Both the GSM and CDMA camps formed their own separate 3G partnership projects (3GPP and 3GPP2, respectively) to develop IMT-2000 compliant standards based on the CDMA technology. The 3G standard in 3GPPis referred to as wideband CDMA(WCDMA) because it uses a larger 5 MHz bandwidth relative to 1.25 MHz bandwidth used in 3GPP2's cdma2000 system. The 3GPP2 also developed a 5 MHz version supporting three 1.25 MHz subcarriers referred to as cdma2000-3x.

Type
Chapter
Information
LTE for 4G Mobile Broadband
Air Interface Technologies and Performance
, pp. 1 - 4
Publisher: Cambridge University Press
Print publication year: 2009

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  • Introduction
  • Farooq Khan
  • Book: LTE for 4G Mobile Broadband
  • Online publication: 28 February 2011
  • Chapter DOI: https://doi.org/10.1017/CBO9780511810336.002
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  • Introduction
  • Farooq Khan
  • Book: LTE for 4G Mobile Broadband
  • Online publication: 28 February 2011
  • Chapter DOI: https://doi.org/10.1017/CBO9780511810336.002
Available formats
×

Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Introduction
  • Farooq Khan
  • Book: LTE for 4G Mobile Broadband
  • Online publication: 28 February 2011
  • Chapter DOI: https://doi.org/10.1017/CBO9780511810336.002
Available formats
×