To calculate the network received signal strength in ns3, we should measure the signal power received by nodes in the network. We can achieve this by using the built-in tracing capabilities of ns3, which captures various metrics that include received signal strength indication (RSSI). Here is a step-by-step guide to calculate the received signal strength in ns3.
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Steps for calculating Received Signal Strength
- Set up the simulation :
- Make sure that ns3 is installed in the computer. If not, install it and include necessary modules.
- Create Network Topology:
- create nodes and configure the network topology.
- Set up Wi-Fi devices and mobility models for the nodes.
- Configure Applications:
- On the nodes, setup applications to generate and receive traffic.
- 4. Enable Tracing and Metrics Collection:
- To capture relevant metrics such as received signal strength, use ns3 tracing capabilities.
- Run the simulation :
- Execute the simulation and collect the trace data.
- Analyze the results :
- Post-process the trace data to analyze the received signal strength.
Example code for Received Signal Strength
Create a basic set up of network with Wi-Fi, generate traffic, and capture received signal strength in ns3.
#include “ns3/core-module.h”
#include “ns3/network-module.h”
#include “ns3/internet-module.h”
#include “ns3/point-to-point-module.h”
#include “ns3/applications-module.h”
#include “ns3/mobility-module.h”
#include “ns3/wifi-module.h”
#include “ns3/log.h”
using namespace ns3;
NS_LOG_COMPONENT_DEFINE (“ReceivedSignalStrengthExample”);
void RxCallback (std::string context, Ptr<const Packet> packet, const Address &address)
{
NS_LOG_UNCOND (“Packet received at ” << Simulator::Now ().GetSeconds () << ” seconds”);
}
void PhyRxTrace (Ptr<OutputStreamWrapper> stream, Ptr<const Packet> packet, double snr, WifiTxVector txVector, WifiPreamble preamble)
{
*stream->GetStream () << Simulator::Now ().GetSeconds () << “\t” << snr << std::endl;
}
int main (int argc, char *argv[])
{
// Set up logging
LogComponentEnable (“UdpClient”, LOG_LEVEL_INFO);
LogComponentEnable (“UdpServer”, LOG_LEVEL_INFO);
// Create nodes
NodeContainer wifiStaNodes;
wifiStaNodes.Create (2);
NodeContainer wifiApNode = wifiStaNodes.Get (0);
// Install Mobility model
MobilityHelper mobility;
mobility.SetMobilityModel (“ns3::ConstantPositionMobilityModel”);
mobility.Install (wifiStaNodes);
// Create WiFi devices
WifiHelper wifi;
wifi.SetStandard (WIFI_STANDARD_80211b);
YansWifiChannelHelper channel = YansWifiChannelHelper::Default ();
YansWifiPhyHelper phy = YansWifiPhyHelper::Default ();
phy.SetChannel (channel.Create ());
WifiMacHelper mac;
Ssid ssid = Ssid (“ns-3-ssid”);
mac.SetType (“ns3::StaWifiMac”, “Ssid”, SsidValue (ssid), “ActiveProbing”, BooleanValue (false));
NetDeviceContainer staDevices = wifi.Install (phy, mac, wifiStaNodes);
mac.SetType (“ns3::ApWifiMac”, “Ssid”, SsidValue (ssid));
NetDeviceContainer apDevices = wifi.Install (phy, mac, wifiApNode);
// Install Internet stack
InternetStackHelper stack;
stack.Install (wifiStaNodes);
// Assign IP addresses
Ipv4AddressHelper address;
address.SetBase (“10.1.3.0”, “255.255.255.0”);
Ipv4InterfaceContainer staInterfaces = address.Assign (staDevices);
Ipv4InterfaceContainer apInterfaces = address.Assign (apDevices);
// Install and start applications on nodes
UdpServerHelper myServer (9);
ApplicationContainer serverApp = myServer.Install (wifiStaNodes.Get (1));
serverApp.Start (Seconds (1.0));
serverApp.Stop (Seconds (10.0));
UdpClientHelper myClient (staInterfaces.GetAddress (1), 9);
myClient.SetAttribute (“MaxPackets”, UintegerValue (320));
myClient.SetAttribute (“Interval”, TimeValue (MilliSeconds (50)));
myClient.SetAttribute (“PacketSize”, UintegerValue (1024));
ApplicationContainer clientApp = myClient.Install (wifiStaNodes.Get (0));
clientApp.Start (Seconds (2.0));
clientApp.Stop (Seconds (10.0));
// Trace received packets
phy.SetReceiveOkCallback (MakeCallback (&RxCallback));
// Set up tracing for received signal strength
AsciiTraceHelper ascii;
Ptr<OutputStreamWrapper> stream = ascii.CreateFileStream (“received-signal-strength.tr”);
phy.EnableAsciiAll (stream);
Config::Connect (“/NodeList/*/DeviceList/*/Phy/MonitorSnifferRx”, MakeBoundCallback (&PhyRxTrace, stream));
// Run the simulation
Simulator::Stop (Seconds (11.0));
Simulator::Run ();
// Clean up
Simulator::Destroy ();
return 0;
}
Explanation:
- Setup Logging:
- To track activities, enable logging for the UDP applications.
- Create Nodes:
- Create a set of nodes representing the Wi-Fi station (STA) and access point (AP).
- Install Mobility Model:
- On the nodes, install a mobility model (e.g., ConstantPositionMobilityModel).
- Create Wi-Fi Devices:
- On the nodes, configure and install Wi-Fi devices.
- Install Internet Stack:
- On the nodes, install the Internet stack.
- Assign IP Addresses:
- Assign IP addresses to the network interfaces.
- Install Applications:
- Install UDP server and client applications on the nodes.
- Trace Received Packets:
- To trace received packets and log the event, set up a callback.
- Set Up Tracing for Received Signal Strength:
- To log the received signal strength, create an output stream.
- Connect to the MonitorSnifferRx trace source to capture the received signal strength.
- Run Simulation:
- Run the simulation for the specified duration.
Analyzing the Results:
- Received Signal Strength:
- Along with the simulation time and SNR (signal-to-noise ratio), the received signal strength is logged to a file (e.g., received-signal-strength.tr).
- This metric provides an indication of the signal quality at the receiver.
Overall, we had simulation results on calculating the network received signal strength in ns3 by measuring the signal power received by nodes in the network. Also, we provide a detailed explanation on Network Received Signal Strength.If you face difficulties in performing a comparison analysis, please share your specifications with us, and we’ll provide helpful advice.