--- a/src/helper/wimax-helper.cc	Wed Apr 21 15:59:25 2010 -0400
+++ b/src/helper/wimax-helper.cc	Thu Apr 22 11:31:45 2010 +0200
@@ -80,7 +80,7 @@
       phy = CreateObject<SimpleOfdmWimaxPhy> ();
       if (!m_channel)
         {
-          m_channel = CreateObject<SimpleOfdmWimaxChannel> ();
+          m_channel = CreateObject<SimpleOfdmWimaxChannel> (SimpleOfdmWimaxChannel::COST231_PROPAGATION);
         }
       break;
     default:
@@ -91,6 +91,15 @@
   return phy;
 }
 
+void WimaxHelper::SetPropagationLossModel (SimpleOfdmWimaxChannel::PropModel propagationModel)
+{
+  if (!m_channel)
+    {
+      m_channel = CreateObject<SimpleOfdmWimaxChannel> ();
+    }
+  m_channel->GetObject<SimpleOfdmWimaxChannel> ()->SetPropagationModel (propagationModel);
+}
+
 Ptr<WimaxPhy> WimaxHelper::CreatePhy (PhyType phyType, char * SNRTraceFilePath, bool activateLoss)
 {
   Ptr<WimaxPhy> phy;
@@ -104,7 +113,7 @@
       sphy->ActivateLoss (activateLoss);
       if (!m_channel)
         {
-          m_channel = CreateObject<SimpleOfdmWimaxChannel> ();
+          m_channel = CreateObject<SimpleOfdmWimaxChannel> (SimpleOfdmWimaxChannel::COST231_PROPAGATION);
         }
       break;
     default: