About discrete time model for wireless channel

1. What is channel modeling of wireless channel?
2. What is wireless channel coherence time?
3. What are the factors that cause delay dispersion in wireless channel?

What is channel modeling of wireless channel?

A channel model is a mathematical representation of the effects of a communication channel through which wireless signals are propagated. The channel model can represent the power loss incurred by the signal as it travels through the wireless medium.

What is wireless channel coherence time?

The coherence time is the characteristic time over which the channel gain does not change appreciably. This metric is mainly influenced by mobile transceiver mobility and is significantly related to users' movement [1]. The analysis of indoor mobile channels is challenging for several reasons.

What are the factors that cause delay dispersion in wireless channel?

Radio Frequency Systems

That greater distance causes the secondary (multipath) signal to be delayed by a factor of the greater distance and the wavelength of the frequency of the channel on which it is operating. Accordingly, because it arrives at the receiving antenna later, it gets processed later.