lection and is compatible with the cdmaOne, cdma2000 1x, cdma2000 1x EV-DO, and cdma2000 1x EV-DV air interfaces. Deploy- ing smart antenna arrays reduces same-cell interference by making use of space divi- sion multiplexing (SDM). This can lead to significant cost savings or at least can de- lay a major expense because it delays the need to deploy new base stations, a major cost in cellular network deployment. Smart antennas also may help extend the range The authors shudder as we remember years of promises saying that we would be able to plug new CPU chips into our personal computers without buying a new motherboard. Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Wireless Data Services Key Data Concepts of high-speed data services so that higher rates are available further from the base station. 21.3 Conclusion With this chapter on the deployment of wireless data services, we have completed our exploration of the core principles of information technology systems and their applica- tion to wireless telephony. 3G services put data technology underneath the wireless network by providing packet pipes, smart antennas, and other high-tech components. At the same time, 3G services include data service as an integral part of the wireless telephone system so that subscribers can download custom ring tones and e-mail to their cellular telephones. In Part 5 "Capacity and Quality Principles," we look at the core concepts we will ap- ply to the remainder of this book, where we focus on the application of all these ideas to our goals: the planning and optimization of capacity and quality on CDMA networks. Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Source: CDMA CAPACITY AND QU