What is LTI system

LTI is also called an LSI system. LTI stands for the linear time-invariant system also stands for a linear shift-invariant system. LTI is a class of system used in signal and system in digital communication for a linear and time-invariant system.

Linear system is the system whose outputs for a linear combination of input are the same as a linear combination of input is as a linear combination of individual response to those inputs and also have the time-invariant system are a system where the output does not depend on when input was applied.