Can anyone explain me what does it mean? and How the system works for controllers?
Hi,
To understand and use LTI in a specific context (ex: you mention controllers, assuming control systems?), you will need to know about a few things first, such as:
]Advanced calculus/:m]
]Linear algebra/:m]
]Fourier and Laplace transforms/:m]
]Control theory/:m]
We recommend that you check out the Wikipedia page for Linear time-invariant theory, since it provides a decent intro to the subject. You may also want to check the References, Further reading and External links at the bottom of the page for more complete/in depth information.
You can probably find many other good explanations all over the internet, such as on Quora.
Sincerely,