Howtosignalprocessing
Fast fading occurs when the coherence time of the channel is small relative to the delay requirement of the application. In this case, the amplitude and phase change imposed by the channel varies considerably over the period of use.
- What are the reasons for fast fading?
- What are the three types of fading?
- What is meant by fading in communication?
- How do you overcome fading in wireless communication?
What are the reasons for fast fading?
Fast Fading: It occurs mainly due to reflections for surfaces and movement of transmitter or receiver. High doppler spread is observed in the fast fading with Doppler bandwidth comparable to or greater than the bandwidth of the signal and the channel variations are as fast or faster than the signal variations.
What are the three types of fading?
The Fading types are divided into large scale fading and small scale fading (multipath delay spread and doppler spread). Flat fading and frequency selecting fading are part of multipath fading where as fast fading and slow fading are part of doppler spread fading.
What is meant by fading in communication?
Fading occurs when there are significant variations in received signal amplitude and phase over time or space. Fading can be frequency-selective—that is, different frequency components of a single transmitted signal can undergo different amounts of fading.
How do you overcome fading in wireless communication?
This section describe methods that can help reduce the problem of fading in wireless communication channels as illustrated by figure 2; they are Diversity for fast and slow fading , Equalization for flat and frequency selection fading , Rake receiver for multipath fading and Channel Coding for deep fading.
