(a) Briefly explain what is meant by threshold effect in FM receivers. Why is this effect not present in PM receivers?
(b) Briefly explain why pre-emphasis/de-emphasis filtering can be used to improve the receiver performance in FM but not in PM. (c) Briefly explain why and ergodic random process must be a stationary process.
(d) A communication link operates at a frequency of 1-MHz. By how much should the transmitter-receiver distance be increased in order to increase the free space loss by 6dB?