How to understand "cyclostationary"?

[avanti!]

Hi, everyone:
when i read some papers about phase noise, it descibes such noise is cyclostationary. How to understand "cyclostationary" and "stationary"? Is there any textbook about that?

Thx!!

 

[IanP]

An Introduction to Cyclostationary Noise:
**broken link removed**

 

[kokabanga]

Noise in mixers, oscillators, samplers, and logic: an introduction to cyclostationary noise

https://www.designers-guide.org/Theory/cyclo-paper.pdf