Two components of linear distortion produced by transmitting asignal through an LTI (linear time invariant) system:
Amplitude distortion - the frequency components of the input signalare transmitted through the system with different amounts of gainor attenuation.
Phase distortion - the phase response is not linear with frequencyinside the frequency band of interest. Different frequencycomponents are subject to different delay in passing through thesystem.
Multipath propagation model: y[n] = x[n] + ax[n-1].
In general, the parameter a can be real or complex, so long as |a|< 1.
What form of linear distortion is introduced by this channel?