wifi: (fixes #709) Scale RxSensitivity by channel width for YansWifiChannel

RELEASE_NOTES.md

@@ -31,6 +31,7 @@ Release 3-dev
 - (wifi) Only include QoS Null frames for TIDs for which a BA agreement exists in responses to BSRP TFs
 - (wifi) Notify RX end only for the last received HE TB PPDU
 - (wifi) Correctly compute the time to RX end to be passed to WifiPhyStateHelper::SwitchToRx()
+- (wifi) #709 Adjust WifiPhy::RxSensitivity with channel width for YansWifiChannel
 
 Release 3.36.1
 --------------

src/wifi/model/yans-wifi-channel.cc

@@ -127,7 +127,9 @@ YansWifiChannel::Receive (Ptr<YansWifiPhy> phy, Ptr<const WifiPpdu> ppdu, double
   NS_LOG_FUNCTION (phy << ppdu << rxPowerDbm);
   // Do no further processing if signal is too weak
   // Current implementation assumes constant RX power over the PPDU duration
-  if ((rxPowerDbm + phy->GetRxGain ()) < phy->GetRxSensitivity ())
+  // Compare received TX power per MHz to normalized RX sensitivity
+  uint16_t txWidth = ppdu->GetTransmissionChannelWidth ();
+  if ((rxPowerDbm + phy->GetRxGain ()) < phy->GetRxSensitivity () + RatioToDb (txWidth / 20.0))
     {
       NS_LOG_INFO ("Received signal too weak to process: " << rxPowerDbm << " dBm");
       return;