From 71728fa264a2b803d808473becd3eb496994bbfe Mon Sep 17 00:00:00 2001
From: Nicola Baldo <nbaldo@cttc.es>
Date: Mon, 7 Jun 2010 17:05:29 +0200
Subject: [PATCH] fixed bug 844

---
 src/devices/wifi/yans-wifi-phy.cc | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/devices/wifi/yans-wifi-phy.cc b/src/devices/wifi/yans-wifi-phy.cc
index 24de83ecd..02d0b2545 100644
--- a/src/devices/wifi/yans-wifi-phy.cc
+++ b/src/devices/wifi/yans-wifi-phy.cc
@@ -726,7 +726,16 @@ YansWifiPhy::GetPowerDbm (uint8_t power) const
 {
   NS_ASSERT (m_txPowerBaseDbm <= m_txPowerEndDbm);
   NS_ASSERT (m_nTxPower > 0);
-  double dbm = m_txPowerBaseDbm + power * (m_txPowerEndDbm - m_txPowerBaseDbm) / m_nTxPower;
+  double dbm;
+  if (m_nTxPower > 1)
+    {
+      dbm = m_txPowerBaseDbm + power * (m_txPowerEndDbm - m_txPowerBaseDbm) / (m_nTxPower - 1);
+    }
+  else 
+    {
+      NS_ASSERT_MSG (m_txPowerBaseDbm == m_txPowerEndDbm, "cannot have TxPowerEnd != TxPowerStart with TxPowerLevels == 1");
+      dbm = m_txPowerBaseDbm;
+    }
   return dbm;
 }