How can I shape my time channel response, in order to have Gaussian shaped Doppler Spread?

1. What is the relation of the coherence time with Doppler spread?
2. How fading is affected by Doppler spread and multipath time delay spread?
3. What is delay spread and Doppler spread?
4. How would you recall fading and Doppler spread?

What is the relation of the coherence time with Doppler spread?

The coherence time T_c is fundamentally interpreted as the order-of-magnitude duration of a fade at a given frequency. The Doppler shift and Doppler spread are both linear functions of the signal frequency. The variation of Doppler spread with frequency is important when the operating frequency bands are different.

How fading is affected by Doppler spread and multipath time delay spread?

The channel Impulse response changes rapidly within the symbol duration. That is, the coherence time of the channel is smaller than the symbol period of the transmitted signal. This causes frequency dispersion, also called time-selective fading, due to Doppler spreading.

What is delay spread and Doppler spread?

Delay spread helps determine coherence bandwidth and coherence time of a wireless system. Doppler Spread: Doppler frequency shift is usually different from path to path when signal arrives at the wireless receiver.

How would you recall fading and Doppler spread?

Fast Fading: In a fast fading channel, the channel impulse response changes rapidly within the symbol duration. That is, the coherence time of the channel is smaller than the symbol period of the transmitted signal. This causes frequency dispersion due to Doppler spreading, which leads to signal distortion.