How to Implement MIMO in OMNeT++

To implement Multiple Input Multiple Output (MIMO) in OMNeT++, we have to set up the environment where the nodes should support MIMO capabilities, defining network models, implementing MIMO-specific communication protocols, and running simulations by simulating it. Here’s a step-by-step approach of MIMO in OMNeT++ with samples.

Step-by-Step Implementation:

Step 1: Install OMNeT++ and INET Framework

1. Download OMNeT++:
   • Download the latest version of OMNeT++.
2. Install OMNeT++:
   • Go through the instruction to install properly on your system.
3. Download and Install INET Framework:
   • The INET framework offers models for internet protocols and is usually used with OMNeT++.
   • Install the INET Framework in your computer.

Step 2: Set Up Your Project

1. Create a New OMNeT++ Project:
   • Open the OMNeT++ IDE.
   • Go to File -> New -> OMNeT++ Project.
   • Enter a project name and choose the aptable options.
2. Set Up Directory Structure:
   • Make certain that the project contains folders like src for source files and simulations for NED files and configuration.
3. Add INET to Your Project:
   • Right-click on project in the Project Explorer.
   • Select Properties -> Project References.
   • Check the box for INET.

Step 3: Define MIMO Network Models Using NED

1. Create NED Files:
   • In the src directory, create a new NED file (e.g., MimoNetwork.ned).
   • Define the network topology in the NED file. Here’s a simple example:

package mimo;

import inet.node.inet.StandardHost;

import inet.node.inet.Router;

import inet.networklayer.configurator.ipv4.Ipv4NetworkConfigurator;

import inet.physicallayer.common.packetlevel.RadioMedium;

import inet.mobility.single.RandomWaypointMobility;

network MimoNetwork

{

parameters:

int numHosts = default(10);

types:

channel radioChannel extends RadioMedium {}

submodules:

configurator: Ipv4NetworkConfigurator {

@display(“p=100,100”);

}

accessPoint: Router {

@display(“p=200,100”);

}

host[numHosts]: StandardHost {

@display(“p=300+100*i,200”);

mobility.typename = “RandomWaypointMobility”;

}

radioMedium: radioChannel {

@display(“p=400,100”);

}

connections allowunconnected:

for i=0..numHosts-1 {

host[i].wlan[0] <–> radioMedium <–> accessPoint.wlan[0];

}

}

Step 4: Implement MIMO Communication Logic

1. Modify INET’s Physical Layer:
   • INET provides a configurable physical layer model that can be flexible for MIMO. Make sure to use the Ieee80211ScalarRadioMedium with MIMO settings.
2. Update NED for MIMO:
   • Use the Ieee80211ScalarRadioMedium and configure it for MIMO by updating the NED file:

network MimoNetwork

{

parameters:

int numHosts = default(10);

types:

channel radioChannel extends Ieee80211ScalarRadioMedium {

@display(“bgb=600,600;bgi=background;bgf=bg.jpg”);

}

submodules:

configurator: Ipv4NetworkConfigurator {

@display(“p=100,100”);

}

accessPoint: Router {

@display(“p=200,100”);

}

host[numHosts]: StandardHost {

@display(“p=300+100*i,200”);

mobility.typename = “RandomWaypointMobility”;

}

radioMedium: radioChannel {

@display(“p=400,100”);

physicalEnvironmentModule = “^.^.physicalEnvironment”;

backgroundNoiseModule = “^.^.backgroundNoise”;

}

connections allowunconnected:

for i=0..numHosts-1 {

host[i].wlan[0] <–> radioMedium <–> accessPoint.wlan[0];

}

}

1. Configure MIMO in omnetpp.ini:

[General]

network = MimoNetwork

sim-time-limit = 100s

# Radio medium configuration

**.radioMedium.typename = “Ieee80211ScalarRadioMedium”

**.radioMedium.propagation.typename = “ConstantSpeedPropagation”

**.radioMedium.pathLoss.typename = “FreeSpacePathLoss”

**.radioMedium.obstacleLoss.typename = “TraceObstacleLoss”

**.radioMedium.backgroundNoise.typename = “IsotropicScalarBackgroundNoise”

**.radioMedium.mediumLimitCache.typename = “GridMediumLimitCache”

**.radioMedium.rangeFilter.typename = “ConstantRangeFilter”

# Physical layer configuration

**.host*.wlan[*].radio.typename = “Ieee80211ScalarRadio”

**.host*.wlan[*].radio.transmitter.power = 20mW

**.host*.wlan[*].radio.receiver.sensitivity = -85dBm

# MIMO specific configuration

**.host*.wlan[*].radio.transmitter.antennaGain = 2dBi

**.host*.wlan[*].radio.receiver.antennaGain = 2dBi

**.host*.wlan[*].radio.transmitter.numAntennas = 2

**.host*.wlan[*].radio.receiver.numAntennas = 2

# Mobility configuration

**.host*.mobility.bounds = “0,0,1000,1000”

**.host*.mobility.speed = uniform(1mps, 10mps)

Step 5: Implement Custom MIMO Modules (Optional)

1. Create C++ Modules:
   • Create a new C++ class (e.g., MimoApp.cc) within the src directory.
   • Include necessary OMNeT++ headers and state the custom MIMO logic:

#include <omnetpp.h>

#include “inet/applications/base/ApplicationBase.h”

#include “inet/applications/udpapp/UdpBasicApp.h”

#include “inet/networklayer/common/L3AddressResolver.h”

#include “inet/networklayer/contract/ipv4/Ipv4Address.h”

#include “inet/networklayer/contract/IL3AddressType.h”

using namespace omnetpp;

using namespace inet;

class MimoApp : public ApplicationBase

{

protected:

virtual void initialize(int stage) override;

virtual void handleMessageWhenUp(cMessage *msg) override;

void sendPacket();

void handlePacket(cPacket *pkt);

};

 

Define_Module(MimoApp);

 

void MimoApp::initialize(int stage)

{

ApplicationBase::initialize(stage);

if (stage == INITSTAGE_LOCAL) {

// Initialization code

if (par(“sendPackets”).boolValue()) {

scheduleAt(simTime() + par(“startDelay”), new cMessage(“sendPacket”));

}

}

}

 

void MimoApp::handleMessageWhenUp(cMessage *msg)

{

if (msg->isSelfMessage()) {

if (strcmp(msg->getName(), “sendPacket”) == 0) {

sendPacket();

scheduleAt(simTime() + par(“sendInterval”), msg);

}

} else {

cPacket *pkt = check_and_cast<cPacket *>(msg);

handlePacket(pkt);

}

}

void MimoApp::sendPacket()

{

// Create and send a packet

EV << “Sending packet” << endl;

cPacket *pkt = new cPacket(“MimoPacket”);

pkt->setByteLength(par(“packetSize”));

send(pkt, “lowerLayerOut”);

}

void MimoApp::handlePacket(cPacket *pkt)

{

// Handle received packet

EV << “Received packet: ” << pkt->getName() << endl;

delete pkt;

}

1. Modify NED to Use Custom Modules:
   • Update your NED file to use custom MIMO application module:

network MimoNetwork

{

parameters:

int numHosts = default(10);

types:

channel radioChannel extends Ieee80211ScalarRadioMedium {

@display(“bgb=600,600;bgi=background;bgf=bg.jpg”);

}

submodules:

configurator: Ipv4NetworkConfigurator {

@display(“p=100,100”);

}

accessPoint: Router {

@display(“p=200,100”);

}

host[numHosts]: StandardHost {

@display(“p=300+100*i,200”);

mobility.typename = “RandomWaypointMobility”;

@children:

udpApp: MimoApp {

localPort = 12345;

destPort = 54321;

startTime = uniform(0, 1s);

packetSize = 512B;

sendInterval = exponential(1s);

}

}

radioMedium: radioChannel {

@display(“p=400,100”);

physicalEnvironmentModule = “^.^.physicalEnvironment”;

backgroundNoiseModule = “^.^.backgroundNoise”;

}

connections allowunconnected:

for i=0..numHosts-1 {

host[i].wlan[0] <–> radioMedium <–> accessPoint.wlan[0];

}

}

Step 6: Build and Run the Simulation

1. Build the Project:
   • In the OMNeT++ IDE, right-click on project and select Build Project.
2. Run the Simulation:
   • Go to Run -> Run Configurations.
   • Generate a new run configuration for your project and run the simulation.

Step 7: Analyze Results

1. View Simulation Results:
   • Use OMNeT++’s tools to analyze the results only after the simulation is done.
   • Open the ANF (Analysis Framework) to visualize and interpret the data.

In this script, we entirely offered the guide to help you get started with a basic MIMO simulation in OMNeT++ using the INET framework and will provide you any extra information related to this topic as per your requirements. For exceptional simulation and implementation services for MIMO in OMNeT++ you can connect with us . We assist you in the deployment of MIMO-specific communication protocols and facilitate your simulation needs.