手机基站只有一个，但同时有几百人打电话、上网。

怎么做到不干扰？

靠多址技术区分每个人。

常见 3 种：

FDMA：按频率分（不同频道）

TDMA：按时间分（轮流说话）

CDMA/OFDMA：按编码分（4G/5G 主流）

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