Howtosignalprocessing
- What is the difference between flat and selective fading?
- What is frequency flat fading?
- What are the three types of fading?
- How does CDMA minimize fading?
What is the difference between flat and selective fading?
Flat Fading is caused by absorbers between the two antennae and is countered by antenna placement and transmit power level. Frequency selective fading is caused by reflectors between the transmitter and receiver creating multi-path effects.
What is frequency flat fading?
All frequency components of the transmitted signal that fall within the coherence bandwidth will fade simultaneously. In other words, if the bandwidth of the transmitted signal is smaller than the coherent bandwidth, only the gain and phase of the signal are changed, and this is called flat fading.
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.
How does CDMA minimize fading?
Fading in CDMA System
It has a high time resolution, due to which it receives a different signal from each path separately. The RAKE receiver prevents signal degradation by summing all the signals.
