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Difference between flat and selective fading
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Flat fading:

  • Channel response in flat fading impaired signal has flat gain/linear phase over bandwidth (BW) which is greater than signal BW.
  • In the flat fading all the components of the frequency of the signal will have the same magnitude of fading with respect to each other.
  • Flat fading, is that type of fading in which all frequency components of the received signal fluctuate in the same proportions simultaneously.
  • Signal undergoes flat fading if following conditions are met:

    Bs << Bc

    Ts >>στ

Selective Fading:

  • In selective fading, channel response of signal has constant gain/linear phase over bandwidth (BW) which is less than that of signal BW.

  • Here different components of the frequency signal will not experience the same fading.

  • Selective fading affects unequally the different spectral components of a radio signal.

  • Signal undergoes selective fading if following conditions are met:

    Bs >Bc

    Ts <στ

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