double RSSIwithError(bool v, double distance3D)
{
  Ptr<NormalRandomVariable> m_norVar;
  m_norVar = CreateObject<NormalRandomVariable> ();
  m_norVar->SetAttribute ("Mean", DoubleValue (0));
   m_norVar->SetAttribute ("Variance", DoubleValue (3));
  double lossDbLOS, lossDbNLOS;

  lossDbLOS = 32.4 + 17.3 * log10 (distance3D) + 20 * log10 (30)+ m_norVar->GetValue();

  if(v==true)
  {
  m_norVar->SetAttribute ("Variance", DoubleValue (3));
  lossDbLOS = 32.4 + 17.3 * log10 (distance3D) + 20 * log10 (30)+ m_norVar->GetValue();
  return lossDbLOS;

  }
  else
  {
    m_norVar->SetAttribute ("Variance", DoubleValue (8.03));
    lossDbNLOS = 38.3 * log10 (distance3D) + 17.3 + 24.9 * log10 (30)+ m_norVar->GetValue();
    return std::max (lossDbLOS, lossDbNLOS);

  }


}