Flat fading in wireless communication

a) Flat fading The wireless channel is said to be flat fading if it has constant gain and linear phase response over a bandwidth which is greater than the bandwidth of the transmitted signal. In this type of fading all the frequency components of the received signal fluctuate in same proportions simultaneously.

1. What is flat fading and frequency selective fading?
2. What is fading What are its types?
3. What is Doppler fading in wireless communication?
4. What is fading and selective fading?

What is flat fading and frequency selective fading?

Flat Fading is caused by absorbers between the two antennae and is countered by antenna placement and transmit power level. Page 4. Frequency Selective Fading. Frequency selective fading is caused by reflectors between the transmitter and receiver creating multi-path effects.

What is fading What are its types?

Flat Fading: In flat fading, all frequency components get affected almost equally. Flat multipath fading causes the amplitude to fluctuate over a period of time. Selective Fading: Selective Fading or Selective Frequency Fading refers to multipath fading when the selected frequency component of the signal is affected.

What is Doppler fading in wireless communication?

Time-varying fading due to scattering objects or transmitter/receiver motion results in Doppler spread. The time spreading effect of small-scale or microscopic fading is manifested in the time domain as multipath delay spread and in the frequency domain as channel coherence bandwidth.

What is fading and selective fading?

➨In flat fading, range of frequencies in a frequency spectrum are equally faded unlike in frequency selective fading where in one part of frequency spectrum is faded more than the other part of frequency spectrum.