Concept of flat fading effect with appropriate impulse response of channel

Hello Researchers, In this section we will discuss about “Concept of flat fading effect with appropriate impulse response of channel“. In Mobile Radio Propagation specially in Wireless communication it is very much important topic for Researchers.  

  A received signal is said to have underwent Flat Fading if “The Mobile Radio Channel has a constant gain and linear phase response over a Bandwidth which is greater than the Bandwidth of the transmitted Signal” Here the multipath structure of the channel is such that spectral characteristics of the transmitted signal are preserved at the receiver But due to the fluctuations in the gain of the channel caused by multipath, the signal strength varies with time.
                                        Figure: Flat fading effect
⇒ In a flat fading channel, the reciprocal BW (period) of the transmitted signal is much larger than the multi-path time delay spread of the channel. Flat fading channels are also referred as amplitude varying channels or narrow band channels, since the bandwidth of the applied signal is narrow as compared to the channel flat fading bandwidth. ⇒ Signal undergoes Flat Fading if:
  • Bs<<Bc
where Bs is bandwidth of transmitted signal and Bc is the coherence bandwidth of the channel
  • Ts>>st where
Ts is the reciprocal bandwidth (symbol period) and  st rms delay spread.  

There may be some more documents on Concept of flat fading effect with appropriate impulse response of channel, this article is written by taking the help from Internet and other resources like Books, journals etc.


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