Dear Arafat Habib
see these codes
Example Script for Simulation Configuration
1. Configuration of PHY and channel
// *************************************** PHY and Channel ***************************************** //
YansWifiPhyHelper wifiPhy = YansWifiPhyHelper::Default ();
// set it to zero; otherwise, gain will be added
wifiPhy.Set ("RxGain", DoubleValue (0));
wifiPhy.Set ("CcaMode1Threshold", DoubleValue (0.0));
// ns-3 supports RadioTap and Prism tracing extensions for 802.11b
wifiPhy.SetPcapDataLinkType (YansWifiPhyHelper::DLT_IEEE802_11_RADIO);
YansWifiChannelHelper wifiChannel;
wifiChannel.SetPropagationDelay ("ns3::ConstantSpeedPropagationDelayModel");
wifiChannel.AddPropagationLoss ("ns3::LogDistancePropagationLossModel");
wifiPhy.SetChannel (wifiChannel.Create ());
// ************************************************************************************************* //
2. Configuration of MAC
// **************************************** MAC **************************************************** //
// Add a non-QoS upper mac, and disable rate control
NqosWifiMacHelper wifiMac = NqosWifiMacHelper::Default ();
wifi.SetRemoteStationManager ("ns3::ConstantRateWifiManager",
"DataMode",StringValue (phyMode),
"ControlMode",StringValue (phyMode));
// Set it to adhoc mode
wifiMac.SetType ("ns3::AdhocWifiMac");
// ************************************************************************************************* //
3. Configuration of NetDevice
// ***************************************** Net Devices ******************************************* //
NetDeviceContainer devices = wifi.Install (wifiPhy, wifiMac, c.Get (0), 5);
devices.Add (wifi.Install (wifiPhy, wifiMac, c.Get(3), 1));
// This will disable these sending devices from detecting a signal
// so that they do not backoff
wifiPhy.Set ("EnergyDetectionThreshold", DoubleValue (0.0) );
wifiPhy.Set ("TxGain", DoubleValue (offset + Prss) );
devices.Add (wifi.Install (wifiPhy, wifiMac, c.Get (1), 5));
wifiPhy.Set ("TxGain", DoubleValue (offset + Irss) );
devices.Add (wifi.Install (wifiPhy, wifiMac, c.Get (2), 1));
// ************************************************************************************************* //
4. Configuration of Network Topology
// **************************************** Mobility *********************************************** //
// Note that with FixedRssLossModel, the positions below are not
// used for received signal strength.
MobilityHelper mobility;
Ptr positionAlloc = CreateObject ();
positionAlloc->Add (Vector (0.0, 0.0, 0.0));
positionAlloc->Add (Vector (distanceToRx, 0.0, 0.0));
positionAlloc->Add (Vector (0, -distanceToRx, 0.0));
positionAlloc->Add(Vector (distanceToRx, -distanceToRx, 0.0));
mobility.SetPositionAllocator (positionAlloc);
mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");
mobility.Install (c);
// ************************************************************************************************* //
Best Regards
Hi you can take a look in this link good luck
http://slogix.in/cognitive-radio-networks-source-code
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