Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Small vs. Large Scale Fading

Status
Not open for further replies.

saeddawoud

Full Member level 3
Joined
Apr 27, 2007
Messages
159
Helped
6
Reputation
12
Reaction score
1
Trophy points
1,298
Activity points
2,166
Hello,

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

Thanks in advance
 

saeddawoud

Full Member level 3
Joined
Apr 27, 2007
Messages
159
Helped
6
Reputation
12
Reaction score
1
Trophy points
1,298
Activity points
2,166
Communications_Engineer said:
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.
 

mohamed_bakr

Newbie level 6
Joined
Apr 28, 2007
Messages
13
Helped
1
Reputation
2
Reaction score
0
Trophy points
1,281
Activity points
1,368
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.
 

Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top