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How to Implement New Waveform in OMNeT++

To implement a new waveform in OMNeT++ has several steps that include defining the features of the waveform and incorporating it into the replication scenario usually within the physical layer (PHY) module. The given below is the brief structure to implement the new waveform in OMNeT++:

Step-by-Step Implementation:

Step 1: Set Up OMNeT++ Environment

  1. Install OMNeT++: Make sure OMNeT++ is installed and configured on system.
  2. Set up the INET Framework: If we are using the INET framework, make sure it is correctly incoporated, as it offers the useful modules for networking simulations.

Step 2: Define the New Waveform

The waveform can be characterized by its modulation, frequency, bandwidth, and other parameters. We will execute this waveform in the PHY layer of a node.

  1. Create a New Waveform Class in C++:

We need to describe a new waveform class that sum up the waveform’s properties and behaviour.

Example: MyWaveform.h

#ifndef __MYWAVEFORM_H__

#define __MYWAVEFORM_H__

#include “inet/physicallayer/analogmodel/packetlevel/ScalarAnalogModel.h”

using namespace inet;

class MyWaveform : public physicallayer::ScalarAnalogModel {

public:

MyWaveform();

virtual ~MyWaveform();

protected:

virtual physicallayer::IReceptionResult *computeReception(const physicallayer::IReception *reception, const physicallayer::IArrival *arrival) const override;

};

#endif

Example: MyWaveform.cc

#include “MyWaveform.h”

Define_Module(MyWaveform);

MyWaveform::MyWaveform() {

// Initialization code (e.g., setting default values for the waveform)

}

MyWaveform::~MyWaveform() {

// Cleanup code

}

physicallayer::IReceptionResult *MyWaveform::computeReception(const physicallayer::IReception *reception, const physicallayer::IArrival *arrival) const {

// Implement the reception logic specific to your waveform

// Example: Compute Signal-to-Noise Ratio (SNR), determine if reception is successful, etc.

return ScalarAnalogModel::computeReception(reception, arrival);

}

  1. Define the Waveform Parameters:

In a particular metrics like modulation scheme, frequency, and bandwidth in the NED file.

Example NED File:

simple MyWaveform {

parameters:

double centerFrequency @unit(Hz) = default(2.4e9); // 2.4 GHz

double bandwidth @unit(Hz) = default(20e6); // 20 MHz

string modulation = default(“QPSK”); // Quadrature Phase Shift Keying

gates:

input radioIn;

output radioOut;

}

Step 3: Integrate the Waveform into a Node

We need to incoporate this new waveform into a node’s physical layer.

  1. Create a Custom PHY Layer Module:

Example: MyPhyLayer.h

#ifndef __MYPHYLAYER_H__

#define __MYPHYLAYER_H__

#include “inet/physicallayer/base/packetlevel/PhysicalLayerBase.h”

#include “MyWaveform.h”

using namespace inet;

class MyPhyLayer : public physicallayer::PhysicalLayerBase {

protected:

virtual void initialize(int stage) override;

virtual void handleMessageWhenUp(cMessage *msg) override;

private:

MyWaveform *waveform;

};

#endif

Example: MyPhyLayer.cc

#include “MyPhyLayer.h”

Define_Module(MyPhyLayer);

void MyPhyLayer::initialize(int stage) {

PhysicalLayerBase::initialize(stage);

if (stage == INITSTAGE_LOCAL) {

// Initialize the waveform

waveform = new MyWaveform();

}

}

void MyPhyLayer::handleMessageWhenUp(cMessage *msg) {

// Process incoming messages and apply waveform-specific handling

if (msg->isSelfMessage()) {

// Handle self-messages (e.g., timing events)

} else {

// Handle incoming transmissions, apply waveform processing

EV << “Applying MyWaveform processing…\n”;

// Forward to upper layers

send(msg, “upperLayerOut”);

}

}

  1. Define the Node Configuration:

Example NED File:

simple MyNode {

parameters:

@display(“i=device/pc”);

gates:

input upperLayerIn;

output upperLayerOut;

submodules:

radio: Ieee80211Radio;

phy: MyPhyLayer;

connections:

radio.radioIn –> phy.upperLayerOut;

phy.upperLayerIn –> radio.radioOut;

}

Step 4: Set Up the Simulation Network

Describe the network that contains the nodes using custom PHY layer with the new waveform.

Example NED File:

network MyNetwork {

parameters:

int numNodes = default(10); // Number of nodes

submodules:

node[numNodes]: MyNode {

@display(“p=100,100;i=device/pc”);

}

}

Step 5: Configure the Simulation

Configure the simulation metrics in the omnetpp.ini file, like the simulation time, waveform parameters, and network layout.

Example omnetpp.ini File:

[Config MyWaveformSimulation]

network = MyNetwork

sim-time-limit = 100s

*.numNodes = 20

*.node[*].phy.centerFrequency = 2.4e9

*.node[*].phy.bandwidth = 20e6

*.node[*].phy.modulation = “QPSK”

Step 6: Run the Simulation

  1. Compile the Project: Ensure all custom modules are compiled properly.
  2. Run the Simulation: Initiate the simulation in the OMNeT++ IDE.
  3. Observe the Results: Measure how the new waveform impacts communication among the nodes that concentrate on metrics such as throughput, latency, and signal quality.

Step 7: Analyse and Optimize

  • Performance Metrics: gather the information on how the new waveform performs under numerous network conditions.
  • Optimization: Fine-tune the metrics such as bandwidth, modulation, and frequency to enhance the performance.
  • Comparison: Compare the unique waveform against existing waveforms to evaluate its advantages.

In the demonstration we had successfully executed the new waveform in OMNeT++ simulation tool. We will also deliver the additional details regarding the new waveform will be provided.

You can receive top-notch help with implementing New Waveform in the OMNeT++ tool from us. We also provide ideas for Traffic Congestion project topics and offer guidance on analyzing project performance.

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