planning to move out as soon as they save enough money. Having multiple generations share a single dwelling adds value to the privacy of a cell phone that allows you to walk outside and call someone. And in a nation often under siege, being able to call loved ones wherever they or you might be is a major centive for having a mobile telephone. Of course, Israel is much more prosperous than many developing nations. However, it would not be at all surprising if other nations followed a similar path. In this sce- nario, cellular providers would enter the market and compete. People would get cell phones when they move or when they could afford them, and usage would grow. In poorer villages, it could even happen that several families or even a whole village would share a cell phone the way they now share satellite phones or televisions. Having talked about Israel, let us return to China. As of early 2002, China has cho- sen time division synchronized code division multiple access (TD-SCDMA) as the cel- lular technology it will deploy. It also has become the world's largest market for cellu- lar telephones. Much of the equipment manufacturing is being done in China, and TD-SCDMA requires the use of adaptive phased arrays at the base stations. Economies of scale in manufacturing may bring down the cost of adaptive phased arrays so that they are affordable at the WLL user terminal equipment unit as well. It is too early to tell how much WLL China will develop, but they are clearly choosing a technology that is likely to make it feasible. 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. The User Terminal Key Radio Concepts Given the growth of cellular, is there a future for WLL? In all probability, yes, be- cause WLL has some other uses we have not mentioned. First of all, the infrastructure that supports cellular also can support WLL. As a result, in 