Question

Mobile radio channel can be modelled as a ______ filter.

(a) Non-linear

(b) Low-pass

(c) Linear

(d) Bandpass

This question was posed to me in an online interview.

I would like to ask this question from Impulse Response Model of a Multipath Channel in section Mobile Radio Propagation: Small – Scale Fading and Multipath of Wireless/Mobile

Answer 1

Correct option is (c) Linear

The best I can explain: Mobile radio channel may be modelled as a linear filter with a time varying impulse response. The time variation is due to receiver motion in space. The filtering nature is caused by summation of amplitudes and delays of multiple arriving waves at any instant of time.