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calculate correctly rx power

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This commit is contained in:
Mathieu Lacage
2007-11-05 16:31:16 +01:00
parent 28e6e63c5d
commit 277173ae0f
1 changed files with 6 additions and 7 deletions
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13
src/devices/wifi/propagation-loss-model.cc
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@@ -285,7 +285,7 @@ LogDistancePropagationLossModel::GetRxPower (double txPowerDbm,
}
/**
* The formula is:
* rx = 10 * ln (Pr0(tx)) / ln (10) + n * 10 * ln (d/d0) / ln (10)
* rx = 10 * ln (Pr0(tx)) / ln (10) - n * 10 * ln (d/d0) / ln (10)
*
* Pr0: rx power at reference distance d0 (W)
* d0: reference distance: 1.0 (m)
@@ -295,17 +295,16 @@ LogDistancePropagationLossModel::GetRxPower (double txPowerDbm,
*
* Since we use dbm instead of db, we have:
*
* rx = rx0 + 10 / ln (10) * (n * ln (d/d0) - ln (1000))
* rx = rx0 - 10 / ln (10) * (n * ln (d/d0) - ln (1000))
*/
static Ptr<StaticMobilityModel> zero = Create<StaticMobilityModel> (Position (0.0, 0.0, 0.0));
static Ptr<StaticMobilityModel> one = Create<StaticMobilityModel> (Position (1.0, 1.0, 1.0));
double rx0 = m_reference->GetRxPower (txPowerDbm, zero, one);
double rxPowerDbm = rx0 + 10 / log (10) * (m_exponent * log (distance) - log (1000));
NS_LOG_DEBUG ("distance="<<distance<<"m, tx power="<<txPowerDbm<<"dbm, "<<
"reference rx power="<<rx0<<"dbm, "<<
"rx power="<<rxPowerDbm<<"dbm");
double rxPowerDbm = rx0 - 10 / log (10) * (m_exponent * log (distance / m_referenceDistance) - log (1000));
NS_LOG_DEBUG ("distance="<<distance<<"m, tx-power="<<txPowerDbm<<"dbm, "<<
"reference-rx-power="<<rx0<<"dbm, "<<
"rx-power="<<rxPowerDbm<<"dbm");
return rxPowerDbm;
}
} // namespace ns3