随着移动设备使用量的不断增加，是什么帮助移动宽带保持了它的平稳工作呢？今天的超级用户问答帖子回答了一位好奇的读者的问题。

今天的问答环节是由SuperUser提供的，SuperUser是Stack Exchange的一个分支，是一个由社区驱动的问答网站分组。

图片由铁锈桶（Flickr）。

问题

超级用户读者Hooli想知道是什么阻止移动宽带遇到“干扰”问题：

Assuming that mobile broadband uses radio waves to tran**it data, could the number of users connected to a 3G/4G network create an incredible amount of “interference” that would prevent it from working? Why does it work?

是什么阻止了移动宽带遭遇“干扰”问题？

答案

超级用户贡献者jcbermu为我们提供了答案：

3G uses CDMA (Code Division Multiple Access).

With CDMA, several tran**itters can send information simultaneously over a single communication channel. The users share a band of frequencies employing spread-spectrum technology and a special coding scheme where each tran**itter is assigned a code.

Suppose you have a room in which people wish to talk to each other simultaneously. To avoid confusion, people could:

• Take turns speaking (TDMA or Time Division Multiple Access)
• Speak at different pitches (Frequency Division)
• Use different languages (CDMA)

CDMA is like people speaking the same language; they can understand each other but reject the other languages. Similarly, in CDMA each group of users is given a shared code. Many codes occupy the same channel, but only users associated with a particular code can communicate.

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