wifi: Use dBm_per_Hz_u and dBm_per_MHz_u weak aliases

src/wifi/examples/wifi-manager-example.cc

@@ -730,7 +730,7 @@ main(int argc, char* argv[])
 
     // Configure signal and noise, and schedule first iteration
     const auto BOLTZMANN = 1.3803e-23;
-    const auto noiseDensity = WToDbm(BOLTZMANN * 290); // 290K @ 20 MHz
+    const dBm_per_Hz_u noiseDensity = WToDbm(BOLTZMANN * 290); // 290K @ 20 MHz
     const dBm_u noise = noiseDensity + (10 * log10(clientSelectedStandard.m_width * 1000000));
 
     NS_LOG_DEBUG("Channel width " << wifiPhyPtrClient->GetChannelWidth() << " noise " << noise);

src/wifi/model/wifi-phy.cc

@@ -292,7 +292,7 @@ WifiPhy::GetTypeId()
                           "limit (in dBm/MHz) set by regulators.",
                           DoubleValue(100.0), // set to a high value so as to have no effect
                           MakeDoubleAccessor(&WifiPhy::m_powerDensityLimit),
-                          MakeDoubleChecker<double>())
+                          MakeDoubleChecker<dBm_per_MHz_u>())
             .AddAttribute("NotifyMacHdrRxEnd",
                           "Whether the PHY is capable of notifying the MAC about the end of "
                           "the reception of the MAC header of every MPDU.",
@@ -2307,7 +2307,7 @@ WifiPhy::GetTxPowerForTransmission(Ptr<const WifiPpdu> ppdu) const
 
     // Apply power density constraint on EIRP
     const auto channelWidth = ppdu->GetTxChannelWidth();
-    double txPowerDbmPerMhz =
+    dBm_per_MHz_u txPowerDbmPerMhz =
         (txPower + GetTxGain()) - RatioToDb(channelWidth); // account for antenna gain since EIRP
     NS_LOG_INFO("txPower=" << txPower << "dBm with txPowerDbmPerMhz=" << txPowerDbmPerMhz
                            << " over " << channelWidth << " MHz");

src/wifi/model/wifi-phy.h

@@ -1598,12 +1598,12 @@ class WifiPhy : public Object
     dBm_u m_ccaSensitivityThreshold; //!< Clear channel assessment (CCA) modulation and coding rate
                                      //!< sensitivity threshold
 
-    dB_u m_txGain;              //!< Transmission gain
-    dB_u m_rxGain;              //!< Reception gain
-    dBm_u m_txPowerBase;        //!< Minimum transmission power
-    dBm_u m_txPowerEnd;         //!< Maximum transmission power
-    uint8_t m_nTxPower;         //!< Number of available transmission power levels
-    double m_powerDensityLimit; //!< the power density limit (dBm/MHz)
+    dB_u m_txGain;                     //!< Transmission gain
+    dB_u m_rxGain;                     //!< Reception gain
+    dBm_u m_txPowerBase;               //!< Minimum transmission power
+    dBm_u m_txPowerEnd;                //!< Maximum transmission power
+    uint8_t m_nTxPower;                //!< Number of available transmission power levels
+    dBm_per_MHz_u m_powerDensityLimit; //!< the power density limit
 
     bool m_powerRestricted; //!< Flag whether transmit power is restricted by OBSS PD SR
     dBm_u m_txPowerMaxSiso; //!< SISO maximum transmit power due to OBSS PD SR power restriction

src/wifi/test/wifi-phy-ofdma-test.cc

@@ -3003,9 +3003,9 @@ class TestUlOfdmaPhyTransmission : public TestCase
     /**
      * Set the PSD limit
      * \param phy the PHY
-     * \param psdLimit the PSD limit in dBm/MHz
+     * \param psdLimit the PSD limit
      */
-    void SetPsdLimit(Ptr<WifiPhy> phy, double psdLimit);
+    void SetPsdLimit(Ptr<WifiPhy> phy, dBm_per_MHz_u psdLimit);
 
     /**
      * Generate interference function
@@ -3685,7 +3685,7 @@ TestUlOfdmaPhyTransmission::SetBssColor(Ptr<WifiPhy> phy, uint8_t bssColor)
 }
 
 void
-TestUlOfdmaPhyTransmission::SetPsdLimit(Ptr<WifiPhy> phy, double psdLimit)
+TestUlOfdmaPhyTransmission::SetPsdLimit(Ptr<WifiPhy> phy, dBm_per_MHz_u psdLimit)
 {
     NS_LOG_FUNCTION(this << phy << psdLimit);
     phy->SetAttribute("PowerDensityLimit", DoubleValue(psdLimit));