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?

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