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Small vs. Large Scale Fading
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saeddawoud



Joined: 27 Apr 2007
Posts: 156
Helped: 3
Post01 Nov 2009 12:43   

Small vs. Large Scale Fading
Hello,

What is the difference between small-scale and large-scale fading? Anyone can suggest a good material on this?

Thanks in advance
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Communications_Engineer



Joined: 10 Oct 2008
Posts: 492
Helped: 39
Post02 Nov 2009 7:03   

Small vs. Large Scale Fading
refer the book of rappaport
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saeddawoud



Joined: 27 Apr 2007
Posts: 156
Helped: 3
Post02 Nov 2009 13:50   

Re: Small vs. Large Scale Fading
Communications_Engineer wrote:
refer the book of rappaport


I have read it, but it is not clear for me. All I know about this is that in large-scale fading the fading characteristic changes over large distances, while in small-scale fading it is changed over small distances. But I don't know what causes the large-scale fading, and if there is a relationship between large-scale fading and path-loss, and how to distiniguish what causes large and small fading in terms of surrounding areas and obstacles, ...etc.
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mohamed_bakr



Joined: 28 Apr 2007
Posts: 13
Helped: 1
Post05 Nov 2009 13:00   

Re: Small vs. Large Scale Fading
Fading generally is a signal loss either in amplitude or phase due to sudden changes in Channel response.
Large scale fading " Shadowing" concerns about large distances effect so, its affect appears clearly incase of the displacement of either the Transmitter or the Receiver. The most clear example for this case is the RF reception for a Car or a moving vehicle where the signal is influenced by Multipath phenomena where the transmitted signal is received from more than one path.

However Small scale fading is concerned about very small changes in the position of Transmitter or receiver in order of the wavelength as this affect greatly the received frequency due to doppler effect so as the speed of the vehicle increases as the frequency is more rapidly changing and it can be described as fast or slow fading AND flat or slow fading.
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