To implement physical layer communication in ns3 has includes to emulate the actual transmission and reception of signals over a network with regards of factors such as signal strength, interference, and propagation delay. The given below is the detailed procedure on how to implement in ns3 tool:
Step-by-Step Implementation:
Step 1: Set Up ns3 Environment
- Download ns3: Install ns3.
- Install ns3: Follow the installation instructions for your operating system.
- Familiarize with ns3 basics: Understand how to create nodes, set up channels, and run basic simulations.
Step 2: Define Network Topology
Generate the network topology where nodes signify devices that will interact at the physical layer.
#include “ns3/core-module.h”
#include “ns3/network-module.h”
#include “ns3/internet-module.h”
#include “ns3/point-to-point-module.h”
#include “ns3/wifi-module.h”
#include “ns3/mobility-module.h”
#include “ns3/applications-module.h”
using namespace ns3;
NS_LOG_COMPONENT_DEFINE(“PhysicalLayerCommunicationSimulation”);
int main(int argc, char *argv[])
{
CommandLine cmd;
cmd.Parse(argc, argv);
// Create nodes
NodeContainer wifiStaNodes;
wifiStaNodes.Create(2);
NodeContainer wifiApNode = wifiStaNodes.Get(0);
// Set up Wi-Fi PHY and channel
YansWifiChannelHelper channel = YansWifiChannelHelper::Default();
YansWifiPhyHelper phy = YansWifiPhyHelper::Default();
phy.SetChannel(channel.Create());
// Set up Wi-Fi MAC
WifiHelper wifi;
wifi.SetRemoteStationManager(“ns3::AarfWifiManager”);
WifiMacHelper mac;
Ssid ssid = Ssid(“ns-3-ssid”);
mac.SetType(“ns3::StaWifiMac”, “Ssid”, SsidValue(ssid), “ActiveProbing”, BooleanValue(false));
NetDeviceContainer staDevices;
staDevices = wifi.Install(phy, mac, wifiStaNodes);
mac.SetType(“ns3::ApWifiMac”, “Ssid”, SsidValue(ssid));
NetDeviceContainer apDevices;
apDevices = wifi.Install(phy, mac, wifiApNode);
// Set up mobility
MobilityHelper mobility;
mobility.SetPositionAllocator(“ns3::GridPositionAllocator”,
“MinX”, DoubleValue(0.0),
“MinY”, DoubleValue(0.0),
“DeltaX”, DoubleValue(5.0),
“DeltaY”, DoubleValue(10.0),
“GridWidth”, UintegerValue(3),
“LayoutType”, StringValue(“RowFirst”));
mobility.SetMobilityModel(“ns3::RandomWalk2dMobilityModel”,
“Bounds”, RectangleValue(Rectangle(-50, 50, -50, 50)));
mobility.Install(wifiStaNodes);
mobility.SetMobilityModel(“ns3::ConstantPositionMobilityModel”);
mobility.Install(wifiApNode);
// Install internet stack
InternetStackHelper stack;
stack.Install(wifiStaNodes);
// Assign IP addresses
Ipv4AddressHelper address;
address.SetBase(“10.1.1.0”, “255.255.255.0”);
Ipv4InterfaceContainer staInterfaces;
staInterfaces = address.Assign(staDevices);
Ipv4InterfaceContainer apInterface;
apInterface = address.Assign(apDevices);
// Install applications
UdpEchoServerHelper echoServer(9);
ApplicationContainer serverApp = echoServer.Install(wifiApNode);
serverApp.Start(Seconds(1.0));
serverApp.Stop(Seconds(10.0));
UdpEchoClientHelper echoClient(apInterface.GetAddress(0), 9);
echoClient.SetAttribute(“MaxPackets”, UintegerValue(1));
echoClient.SetAttribute(“Interval”, TimeValue(Seconds(1.0)));
echoClient.SetAttribute(“PacketSize”, UintegerValue(1024));
ApplicationContainer clientApp = echoClient.Install(wifiStaNodes.Get(1));
clientApp.Start(Seconds(2.0));
clientApp.Stop(Seconds(10.0));
Simulator::Run();
Simulator::Destroy();
return 0;
}
Step 3: Implement Physical Layer Communication
To simulate physical layer communication accurately, we need to configure the PHY layer attributes, like propagation loss models, error models, and channel models.
- Configure Propagation Loss Model:
YansWifiChannelHelper channel = YansWifiChannelHelper::Default();
channel.SetPropagationDelay(“ns3::ConstantSpeedPropagationDelayModel”);
channel.AddPropagationLoss(“ns3::LogDistancePropagationLossModel”,
“Exponent”, DoubleValue(3.0));
- Configure Error Rate Model:
YansWifiPhyHelper phy = YansWifiPhyHelper::Default();
phy.SetErrorRateModel(“ns3::YansErrorRateModel”);
- Set Data Rate and Channel Width:
wifi.SetStandard(WIFI_PHY_STANDARD_80211a);
wifi.SetRemoteStationManager(“ns3::ConstantRateWifiManager”,
“DataMode”, StringValue(“OfdmRate6Mbps”),
“ControlMode”, StringValue(“OfdmRate6Mbps”));
Step 4: Add Packet Tracing
To analyse the performance of the physical layer communication, add packet tracing to the simulation.
phy.EnablePcap(“phy-layer”, apDevices.Get(0));
Full Example Code
Here, we provide the complete sample code that is as follows:
#include “ns3/core-module.h”
#include “ns3/network-module.h”
#include “ns3/internet-module.h”
#include “ns3/point-to-point-module.h”
#include “ns3/wifi-module.h”
#include “ns3/mobility-module.h”
#include “ns3/applications-module.h”
using namespace ns3;
NS_LOG_COMPONENT_DEFINE(“PhysicalLayerCommunicationSimulation”);
int main(int argc, char *argv[])
{
CommandLine cmd;
cmd.Parse(argc, argv);
// Create nodes
NodeContainer wifiStaNodes;
wifiStaNodes.Create(2);
NodeContainer wifiApNode = wifiStaNodes.Get(0);
// Set up Wi-Fi PHY and channel
YansWifiChannelHelper channel = YansWifiChannelHelper::Default();
channel.SetPropagationDelay(“ns3::ConstantSpeedPropagationDelayModel”);
channel.AddPropagationLoss(“ns3::LogDistancePropagationLossModel”,
“Exponent”, DoubleValue(3.0));
YansWifiPhyHelper phy = YansWifiPhyHelper::Default();
phy.SetChannel(channel.Create());
phy.SetErrorRateModel(“ns3::YansErrorRateModel”);
// Set up Wi-Fi MAC
WifiHelper wifi;
wifi.SetStandard(WIFI_PHY_STANDARD_80211a);
wifi.SetRemoteStationManager(“ns3::ConstantRateWifiManager”,
“DataMode”, StringValue(“OfdmRate6Mbps”),
“ControlMode”, StringValue(“OfdmRate6Mbps”));
WifiMacHelper mac;
Ssid ssid = Ssid(“ns-3-ssid”);
mac.SetType(“ns3::StaWifiMac”, “Ssid”, SsidValue(ssid), “ActiveProbing”, BooleanValue(false));
NetDeviceContainer staDevices;
staDevices = wifi.Install(phy, mac, wifiStaNodes);
mac.SetType(“ns3::ApWifiMac”, “Ssid”, SsidValue(ssid));
NetDeviceContainer apDevices;
apDevices = wifi.Install(phy, mac, wifiApNode);
// Set up mobility
MobilityHelper mobility;
mobility.SetPositionAllocator(“ns3::GridPositionAllocator”,
“MinX”, DoubleValue(0.0),
“MinY”, DoubleValue(0.0),
“DeltaX”, DoubleValue(5.0),
“DeltaY”, DoubleValue(10.0),
“GridWidth”, UintegerValue(3),
“LayoutType”, StringValue(“RowFirst”));
mobility.SetMobilityModel(“ns3::RandomWalk2dMobilityModel”,
“Bounds”, RectangleValue(Rectangle(-50, 50, -50, 50)));
mobility.Install(wifiStaNodes);
mobility.SetMobilityModel(“ns3::ConstantPositionMobilityModel”);
mobility.Install(wifiApNode);
// Install internet stack
InternetStackHelper stack;
stack.Install(wifiStaNodes);
// Assign IP addresses
Ipv4AddressHelper address;
address.SetBase(“10.1.1.0”, “255.255.255.0”);
Ipv4InterfaceContainer staInterfaces;
staInterfaces = address.Assign(staDevices);
Ipv4InterfaceContainer apInterface;
apInterface = address.Assign(apDevices);
// Install applications
UdpEchoServerHelper echoServer(9);
ApplicationContainer serverApp = echoServer.Install(wifiApNode);
serverApp.Start(Seconds(1.0));
serverApp.Stop(Seconds(10.0));
UdpEchoClientHelper echoClient(apInterface.GetAddress(0), 9);
echoClient.SetAttribute(“MaxPackets”, UintegerValue(1));
echoClient.SetAttribute(“Interval”, TimeValue(Seconds(1.0)));
echoClient.SetAttribute(“PacketSize”, UintegerValue(1024));
ApplicationContainer clientApp = echoClient.Install(wifiStaNodes.Get(1));
clientApp.Start(Seconds(2.0));
clientApp.Stop(Seconds(10.0));
// Enable packet tracing
phy.EnablePcap(“phy-layer”, apDevices.Get(0));
Simulator::Run();
Simulator::Destroy();
return 0;
}
Overall, we had understood about how to emulate the actual transmission and reception of signals over a network in the physical layer communication using ns3 framework. We will also elaborate and provide the additional details about physical layer communication.
ns3simulation.com excel in implementing network Physical Layer Communication in ns3tool, we also offer performance analysis to help guarantee success for your project. Receive assistance in simulating the real transmission and reception of signals across a network.