diff -r 4a9feececbf3 -r 310d371059d5 src/wifi/model/snr-tag.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/wifi/model/snr-tag.cc	Sun Feb 10 13:38:35 2013 -0500
@@ -0,0 +1,94 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2005,2006 INRIA
+ * Copyright (c) 2009 MIRKO BANCHI
+ * Copyright (c) 2013 University of Surrey
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
+ * Author: Mirko Banchi <mk.banchi@gmail.com>
+ * Author: Konstantinos Katsaros <dinos.katsaros@gmail.com>
+ */
+
+#include "snr-tag.h"
+#include "ns3/tag.h"
+#include "ns3/double.h"
+
+namespace ns3 {
+
+NS_OBJECT_ENSURE_REGISTERED (SnrTag);
+
+TypeId
+SnrTag::GetTypeId (void)
+{
+  static TypeId tid = TypeId ("ns3::SnrTag")
+    .SetParent<Tag> ()
+    .AddConstructor<SnrTag> ()
+    .AddAttribute ("Snr", "The snr of the last packet received",
+                   DoubleValue (0.0),
+                   MakeDoubleAccessor (&SnrTag::Get),
+                   MakeDoubleChecker<double> ())
+  ;
+  return tid;
+}
+TypeId
+SnrTag::GetInstanceTypeId (void) const
+{
+  return GetTypeId ();
+}
+
+SnrTag::SnrTag ()
+  : m_snr (0)
+{
+}
+SnrTag::SnrTag (double snr)
+  : m_snr (snr)
+{
+}
+
+
+uint32_t
+SnrTag::GetSerializedSize (void) const
+{
+  return sizeof (double);
+}
+void
+SnrTag::Serialize (TagBuffer i) const
+{
+  i.WriteDouble (m_snr);
+}
+void
+SnrTag::Deserialize (TagBuffer i)
+{
+  m_snr = i.ReadDouble ();
+}
+void
+SnrTag::Print (std::ostream &os) const
+{
+  os << "Snr=" << m_snr;
+}
+void
+SnrTag::Set (double snr)
+{
+  m_snr = snr;
+}
+double
+SnrTag::Get (void) const
+{
+  return m_snr;
+}
+
+
+}