Question

Which of the following describes time varying nature of the channel in a small scale region?

(a) Delay spread and coherence time

(b) Coherence bandwidth and delay spread

(c) Doppler spread and coherence time

(d) Delay spread and doppler spread

I got this question in an internship interview.

I want to ask this question from Parameters of Mobile Multipath Channels topic in portion Mobile Radio Propagation: Small – Scale Fading and Multipath of Wireless/Mobile

Answer 1

Right option is (c) Doppler spread and coherence time

Best explanation: Delay spread and coherence bandwidth describes the time dispersive nature of the channel in a local area. They do not give information about the time varying nature of the channel caused by either relative motion between the mobile and base station, or by movement of objects in the channel.