Question

Why is the phase of individual multipath components are not received in RF Pulse system?

(a) Due to use of duplexer

(b) Due to use of ADC

(c) Due to use of flip flops

(d) Due to use of envelope detector

The question was asked during a job interview.

Question is taken from Small- Scale Multipath Measurements topic in portion Mobile Radio Propagation: Small – Scale Fading and Multipath of Wireless/Mobile

Answer 1

The correct answer is (d) Due to use of envelope detector

Easiest explanation: Another disadvantage of RF pulse system is that phase of individual multipath components are not received due to use of an envelope detector. However, use of a coherent detector permits measurement of the multipath phase using this technique.