Hi,
About the problem I had, it was just a question of having the
antennas gain in the variable distCST_, to to it I just made:
First the changes:
In the file wireless-phy.h, add the last two lines described bellow :
/* -NEW- */
inline double getAntennaZ() { return ant_->getZ(); }
inline double getPt() { return Pt_; }
inline double getRXThresh() { return RXThresh_; }
inline double getCSThresh() { return CSThresh_; }
inline double getFreq() { return freq_; }
/*Sugestion just to get the gain Gr_ and Gt_*/
inline double getTxGainGt() { return ant_->getTxGain(0,0,0,lambda_); }
inline double getRxGainGr() { return ant_->getRxGain(0,0,0,lambda_); }
/* End -NEW- */
In the file channel.cc:
Substitute the following expression where the antennas have the gain 1:
distCST_ = wifp->getDist(wifp->getCSThresh(), wifp->getPt(), 1.0, 1.0,
highestZ , highestZ, wifp->getL(),
wifp->getLambda());
for the expression that considers the gain of the antennas:
distCST_ = wifp->getDist(wifp->getCSThresh(), wifp->getPt(),
wifp->getTxGainGt(),
wifp->getRxGainGr(),
highestZ , highestZ, wifp->getL(),
wifp->getLambda());
----------------Where the problem came from:
I was getting problems with the following 2 simulations:
Phy/WirelessPhy set CSThresh_ 630e-15
and i also added the following lines:
Antenna/OmniAntenna set Gt_ 25.0
Antenna/OmniAntenna set Gr_ 50.0
I was using the FreeSpace model, and a distance of 880 m with
Gr=50 and Gt=25.
After running the script for a Pt_ = 0.0158 W (12 dBm), the power received
using the Friis formula or the result printed by the function gives:
0.031842: d: 880.000000, Pr: 1.199811e-09
highestAntennaZ_ = 1.5, distCST_ = 1086.2
But if I run the script for Pt= 0.01 W (10 dBm), there is no packet
received, and Pr is not printed, but it should be more or less
7.2e-10, but the variable highestAntennaZ_ = 1.5, distCST_ = 862.8.
My question is the received power should be 7.2e-10 >>
6.30e-13, that means that the packet should be received.
----------------------------
Thanks for your help, Tiago Junqueira
