diff --git a/src/lte/model/lte-spectrum-value-helper.cc b/src/lte/model/lte-spectrum-value-helper.cc
index 8d834c3bb..7e2b3b8da 100644
--- a/src/lte/model/lte-spectrum-value-helper.cc
+++ b/src/lte/model/lte-spectrum-value-helper.cc
@@ -237,7 +237,7 @@ LteSpectrumValueHelper::CreateTxPowerSpectralDensity (uint16_t earfcn, uint8_t t
   // powerTx is expressed in dBm. We must convert it into natural unit.
   double powerTxW = pow (10., (powerTx - 30) / 10);
 
-  double txPowerDensity = (powerTxW / GetChannelBandwidth (txBandwidthConfiguration));
+  double txPowerDensity = (powerTxW / (txBandwidthConfiguration * 180000));
 
   for (std::vector <int>::iterator it = activeRbs.begin (); it != activeRbs.end (); it++)
     {
@@ -263,10 +263,14 @@ Ptr<SpectrumValue>
 LteSpectrumValueHelper::CreateNoisePowerSpectralDensity (double noiseFigureDb, Ptr<SpectrumModel> spectrumModel)
 {
   NS_LOG_FUNCTION (noiseFigureDb << spectrumModel);
-  double noiseFigureLinear = pow (10.0, noiseFigureDb / 10.0);
-  static const double BOLTZMANN = 1.3803e-23;
-  static const double ROOM_TEMPERATURE = 290.0;
-  double noisePowerSpectralDensity = noiseFigureLinear * BOLTZMANN * ROOM_TEMPERATURE; //  W/Hz
+
+
+  // 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 = pow (10.0, (kT_dBm_Hz - 30)/10.0);
+  double noiseFigureLinear = pow (10.0, noiseFigureDb / 10.0);  
+  double noisePowerSpectralDensity =  kT_W_Hz * noiseFigureLinear;
 
   Ptr<SpectrumValue> noisePsd = Create <SpectrumValue> (spectrumModel);
   (*noisePsd) = noisePowerSpectralDensity;