Hello Everyone
In NS2, for Propagation/TwoRayGround model , How following RXThresh_ & CSThresh_ values are found for respective distance in meters (What are the default values to be considered to find out these values)? For example in aodv tcl sripts following are the values which are given as
set dist(20m) 4.80696e-07
set dist(25m) 3.07645e-07
set dist(30m) 2.13643e-07
set dist(35m) 1.56962e-07
set dist(40m) 1.20174e-07
Phy/WirelessPhy set CSThresh_ $dist(40m)
Phy/WirelessPhy set RXThresh_ $dist(40m)
How above values are computed?? What are the default parameter values considered to find above values? What are Pr (RXThresh_ & CSThresh_ ) values for 50m, 70m, 75m and 100m?
Regards
shailendra
Hi,
It's very simple, the Two-ray ground reflection model is
Pt * Gt * Gr * (ht^2 * hr^2)
Pr = ----------------------------
d^4 * L
Check the implementation in tworayground.cc for detail:
https://github.com/hbatmit/ns2.35/blob/master/mobile/tworayground.cc
For 50m, 70m, 75m and 100m, and much more, check out this:
http://www.winlab.rutgers.edu/~zhibinwu/html/tworayground.html
Good luck!
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