射频人学基带(13)----扩频是什么？

   

   

碎碎念

   

   

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(1)

扩频，常用的有两种，一种称为直接序列扩频(Direct Sequence Spread Spectrum，简称DSSS)，另一种为跳频扩频(Frequency Hopping Spread Spectrum，简称FHSS)。除此之外，还有一些其他的扩频方法。

扩频后的信号，其占用的带宽BW要远大于信息速率R。

参考资料：

[1]Sunny Classroom: DSSS-Direct Sequence Spread Spectrum/FHSS-Frequency Hopping Spread Spectrum

[2] Iain Explains Signals, Systems, and Digital Comms: What is a Spread Spectrum Signal and Why are they used?

[3]https://www.analog.com/cn/resources/technical-articles/introduction-to-spreadspectrum-communications--maxim-integrated.html