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wifi: simplify WifiSpectrumValueHelper::DbmToW

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This commit is contained in:
Alexander Krotov
2018-11-19 12:41:19 +03:00
parent 0684171a6d
commit 7d8c9fd413
1 changed files with 2 additions and 3 deletions
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5
src/spectrum/model/wifi-spectrum-value-helper.cc
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@@ -438,7 +438,7 @@ WifiSpectrumValueHelper::CreateNoisePowerSpectralDensity (double noiseFigureDb,
// see "LTE - From theory to practice"
// Section 22.4.4.2 Thermal Noise and Receiver Noise Figure
const double kT_dBm_Hz = -174.0; // dBm/Hz
double kT_W_Hz = std::pow (10.0, (kT_dBm_Hz - 30) / 10.0);
double kT_W_Hz = DbmToW (kT_dBm_Hz);
double noiseFigureLinear = std::pow (10.0, noiseFigureDb / 10.0);
double noisePowerSpectralDensity = kT_W_Hz * noiseFigureLinear;
@@ -620,8 +620,7 @@ WifiSpectrumValueHelper::NormalizeSpectrumMask (Ptr<SpectrumValue> c, double txP
double
WifiSpectrumValueHelper::DbmToW (double dBm)
{
double mW = std::pow (10.0, dBm / 10.0);
return mW / 1000.0;
return std::pow (10.0, 0.1 * (dBm - 30.0));
}
static Ptr<SpectrumModel> g_WifiSpectrumModel5Mhz; ///< static initializer for the class