How to Start OFDM Wireless Communication Using NS3

To start an Orthogonal Frequency Division Multiplexing (OFDM) wireless communication project using NS3 which has contains to set up the network replicating data transmission by OFDM. OFDM is generally utilized within wireless technologies like LTE, WiFi (IEEE 802.11), and WiMAX, since it offers the high data rates and robustness to multipath interference. We can configure OFDM interaction to utilize the WiFi or LTE modules that support OFDM inherently like portion of its physical layer sets up in NS3.

Below is a step-by-step instruction to configuring an OFDM-based wireless communication project in NS3.

Steps to Start OFDM Wireless Communication Projects in NS3

  1. Install NS3
  1. Download and Install NS3 if we haven’t already installed:

git clone https://gitlab.com/nsnam/ns-3-dev.git ns-3

cd ns-3

./waf configure –enable-examples –enable-tests

./waf build

  1. Verify Installation: Execute a simple instance like a WiFi or LTE example, checking NS3 is properly functioning:

./waf –run=wifi-simple-adhoc

  1. Choose an OFDM-Compatible Module (WiFi or LTE)

OFDM is integrally utilized in:

  • WiFi (IEEE 802.11a/g/n/ac/ax): These WiFi standards utilize OFDM modulation.
  • LTE: For downlink transmission uses OFDM.

Choose which technology, according to the project’s objectives we need to replicate. Utilize the WifiHelper module for WiFi-based OFDM; use the LteHelper module for LTE-based OFDM.

  1. Set Up a Basic OFDM Network Topology (Using WiFi)

This instance utilizes WiFi (IEEE 802.11ac) configuring an OFDM-based interaction system including several nodes in infrastructure mode (using an access point) to interact through WiFi.

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/wifi-module.h”

#include “ns3/mobility-module.h”

#include “ns3/applications-module.h”

using namespace ns3;

int main(int argc, char *argv[]) {

CommandLine cmd;

cmd.Parse(argc, argv);

// Create nodes

NodeContainer wifiStaNodes; // WiFi stations

wifiStaNodes.Create(3);

NodeContainer wifiApNode; // WiFi access point

wifiApNode.Create(1);

// Set up WiFi channel with OFDM parameters

YansWifiChannelHelper channel = YansWifiChannelHelper::Default();

YansWifiPhyHelper phy = YansWifiPhyHelper::Default();

phy.SetChannel(channel.Create());

// Configure WiFi with OFDM-based standard (e.g., 802.11ac)

WifiHelper wifi;

wifi.SetStandard(WIFI_PHY_STANDARD_80211ac); // Use 802.11ac for OFDM

WifiMacHelper mac;

Ssid ssid = Ssid(“ofdm-network”);

// Set up station (STA) devices

mac.SetType(“ns3::StaWifiMac”, “Ssid”, SsidValue(ssid));

NetDeviceContainer staDevices = wifi.Install(phy, mac, wifiStaNodes);

// Set up access point (AP) device

mac.SetType(“ns3::ApWifiMac”, “Ssid”, SsidValue(ssid));

NetDeviceContainer apDevice = wifi.Install(phy, mac, wifiApNode);

// Install Internet stack

InternetStackHelper stack;

stack.Install(wifiApNode);

stack.Install(wifiStaNodes);

// Assign IP addresses

Ipv4AddressHelper address;

address.SetBase(“10.1.1.0”, “255.255.255.0”);

address.Assign(staDevices);

address.Assign(apDevice);

// Set up mobility for nodes (static or with minor mobility)

MobilityHelper mobility;

// AP node is fixed

mobility.SetPositionAllocator(“ns3::GridPositionAllocator”,

“MinX”, DoubleValue(0.0),

“MinY”, DoubleValue(0.0),

“DeltaX”, DoubleValue(5.0),

“DeltaY”, DoubleValue(5.0),

“GridWidth”, UintegerValue(3),

“LayoutType”, StringValue(“RowFirst”));

mobility.SetMobilityModel(“ns3::ConstantPositionMobilityModel”);

mobility.Install(wifiApNode);

// STA nodes can be mobile

mobility.SetMobilityModel(“ns3::RandomWalk2dMobilityModel”,

“Bounds”, RectangleValue(Rectangle(-50, 50, -25, 50)));

mobility.Install(wifiStaNodes);

// Set up applications: UDP echo server on the AP and clients on STAs

uint16_t port = 9;

UdpEchoServerHelper echoServer(port);

ApplicationContainer serverApp = echoServer.Install(wifiApNode.Get(0));

serverApp.Start(Seconds(1.0));

serverApp.Stop(Seconds(10.0));

UdpEchoClientHelper echoClient(Ipv4Address(“10.1.1.1”), port);

echoClient.SetAttribute(“MaxPackets”, UintegerValue(10));

echoClient.SetAttribute(“Interval”, TimeValue(Seconds(1.0)));

echoClient.SetAttribute(“PacketSize”, UintegerValue(1024));

ApplicationContainer clientApps;

for (uint32_t i = 0; i < wifiStaNodes.GetN(); ++i) {

clientApps.Add(echoClient.Install(wifiStaNodes.Get(i)));

}

clientApps.Start(Seconds(2.0));

clientApps.Stop(Seconds(10.0));

Simulator::Run();

Simulator::Destroy();

return 0;

}

  1. Set OFDM-Specific PHY Layer Parameters

We can set up particular OFDM-related metrics on the physical layer like channel width and frequency. For instance, configure the channel width to 20 MHz or 40 MHz for wider channels, to enhance the data rates.

phy.Set(“ChannelWidth”, UintegerValue(20)); // Set channel width to 20 MHz

phy.Set(“Frequency”, UintegerValue(5180));  // Set to a 5 GHz frequency

  1. Use LTE for OFDM-based Cellular Communication

If we select to utilize LTE (which also uses OFDM for the downlink) then configure a simple LTE network including an eNodeB and UEs (User Equipments). LTE’s OFDM set up is constructed in the LteHelper module, thus we don’t want to manually configure OFDM metrics.

Ptr<LteHelper> lteHelper = CreateObject<LteHelper>();

Ptr<PointToPointEpcHelper> epcHelper = CreateObject<PointToPointEpcHelper>();

lteHelper->SetEpcHelper(epcHelper);

NodeContainer enbNodes;

enbNodes.Create(1); // One eNodeB

NodeContainer ueNodes;

ueNodes.Create(2); // Two UEs (mobile devices)

  1. Implement Applications to Simulate OFDM Traffic

Configure applications like OnOffApplication or UdpEchoApplication replicating the traffic over the network, to permit focusing on the performance of OFDM.

Example:

OnOffHelper onOff(“ns3::UdpSocketFactory”, InetSocketAddress(Ipv4Address(“10.1.1.1”), port));

onOff.SetAttribute(“DataRate”, StringValue(“500Kbps”));

onOff.SetAttribute(“PacketSize”, UintegerValue(1024));

ApplicationContainer onOffApp = onOff.Install(wifiStaNodes.Get(0));

onOffApp.Start(Seconds(2.0));

onOffApp.Stop(Seconds(10.0));

  1. Collect and Analyze OFDM Performance Metrics

Accumulate parameters, to estimate the OFDM performance,:

  • Throughput: Calculating the data rate.
  • Latency: In data transmission, examine the delay.
  • Packet Loss: To verify reliability within the presence of interference.

Collect performance data utilizing FlowMonitor:

FlowMonitorHelper flowmon;

Ptr<FlowMonitor> monitor = flowmon.InstallAll();

monitor->SerializeToXmlFile(“ofdm-flowmon.xml”, true, true);

  1. Visualize and Analyze Results
  • NetAnim: Envision node movements, connections, and packet flows utilizing NetAnim.
  • Trace Analysis: For in-depth packet transmission data, we consider trace files.
  • Plotting Tools: Transfer data to graph the performance parameters such as throughput, latency, and packet delivery ratio over time.
  1. Experiment with Advanced OFDM Scenarios

We can discover more situations, after configuring the simple OFDM network:

  • Channel Width Variation: Focus on how modifying the channel width impacts the performance of OFDM.
  • Frequency Selection: Experiment diverse frequencies such as 2.4 GHz vs. 5 GHz to monitor how they affect the OFDM throughput and interference.
  • Mobility and Handover: To replicate situations in which nodes travel among the access points or eNodeBs, learning handover within OFDM.
  • Interference and Multipath Effects: Replicate an interference and multipath since OFDM is modeled to successfully manage it utilizing diverse propagation loss models.

By employing the above offered procedure, we had done the initiation process successfully for OFDM Wireless Communication projects using the tool NS3 and also we provided detailed explanation and sample code snippets. Upon requests, we will deliver deeper insights regarding these projects.

Our developers specialize in wireless technologies such as LTE, WiFi (IEEE 802.11), and WiMAX. We provide detailed, step-by-step instructions to help you configure your project. At phdprojects.org, you can kickstart your OFDM Wireless Communication Projects using the NS3 tool. Once you share your information with us, our support team will offer you innovative ideas and topics. You can trust us for top-notch research guidance, ensuring that your paper is error-free and completely original.