I know, we add s to the scientific contents when want to mention them as a field of study. Compare
Mathematics, Thermodynamics, Physics, ....
My field of study revolves around transmitters, receivers, wireless channels, and others of that ilk. In English, this field is called communications†. Now, I am curious to know which one of the below phrases is correct and what is the difference between them:
- communication systems
- communications systems
The Ngram results:
Specifically, these two book titles are about the field, but one uses s and one does not:
† In some universities it is still called Telecommunications.