The TD/ CDMA (TDD), FDD and particularly TD-SCDMA technologies are presented with brief introductions and comparisons in terms of technical background and application environments.
本文首先从技术背景和应用环境等方面对TD/CDMA（TDD）和FDD，特别是中国提交的TD—SCDMA技术作了介绍和比较。
It provides the background knowledge of Student's Book, such as introductions of famous people, interesting places, pictures, videos, and website, etc…
提供教材中各类知识的背景资料，图片，及相关书目，相关连接，图像资料。
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