To simulate and analyze the performance of SDR-based MANET military communications involving mobile users and dynamic environments with various data types, you can follow a structured approach using tools like NetSim and other relevant software. Here's a comprehensive guide:

### Step-by-Step Guide:

#### 1. Define the Simulation Parameters:

- **Network Topology**: Define the number of mobile users, their mobility patterns, and the area of operation.

- **Communication Frequencies**: UHF, L-band, and S-band.

- **Data Types**: Data, voice, command & control, position location, and ISR video transport.

#### 2. Set Up NetSim:

- **Network Layout**: Create a MANET scenario with nodes representing mobile users.

- **Mobility Model**: Use models like Random Waypoint, Gauss-Markov, or other mobility models to simulate dynamic environments.

- **Traffic Models**: Define traffic generators for different data types (e.g., CBR for voice, VBR for video).

- **Radio Configuration**: Configure the radios for UHF, L-band, and S-band frequencies.

#### 3. Simulation in NetSim:

- **Node Configuration**: Set parameters for each node, including transmission power, antenna gains, and frequency bands.

- **Routing Protocols**: Choose suitable MANET routing protocols (e.g., AODV, DSR, OLSR).

- **Application Layer Settings**: Set the application profiles for different data types.

- **Run Simulations**: Perform simulations under different scenarios to evaluate performance metrics such as throughput, delay, packet delivery ratio, and link reliability.

#### 4. Analyze Results:

- **Performance Metrics**: Use NetSim's analysis tools to gather data on throughput, latency, packet loss, etc.

- **Visualization**: Visualize network performance using graphs and charts to understand the impact of mobility, frequency bands, and data types.

#### 5. Additional Tools for Enhanced Analysis:

- **MATLAB/Simulink**: For advanced signal processing and communication system design.

- **NS-3**: For a more detailed network simulation environment.

- **GNU Radio**: For implementing and testing SDR systems.

- **OMNeT++**: For flexible and extensible network simulations.

- **QualNet**: For comprehensive network modeling and simulation.

### Example Scenario in NetSim:

1. **Create a New Project**: Start with creating a new MANET project in NetSim.

2. **Add Nodes**: Place nodes in a defined area representing mobile users.

3. **Configure Mobility**: Set the mobility model and parameters for node movement.

4. **Set Traffic**: Add different application traffic profiles for data, voice, command & control, position location, and ISR video.

5. **Radio Settings**: Configure radios for UHF, L-band, and S-band frequencies.

6. **Select Protocols**: Choose appropriate routing protocols and MAC layer settings.

7. **Run Simulation**: Execute the simulation and collect results.

8. **Analyze**: Use built-in tools to analyze performance metrics.

### Example of MATLAB/Simulink Integration:

1. **Design SDR Model**: Create a model for SDR-based communication using Simulink.

2. **Import Mobility Data**: Use mobility data from NetSim for realistic movement patterns.

3. **Simulate Waveforms**: Implement waveforms for UHF, L-band, and S-band in Simulink.

4. **Analyze Signal Quality**: Perform detailed signal analysis using MATLAB's toolboxes.

### Resources:

- **NetSim Documentation**: For detailed setup and configuration instructions.

- **MATLAB Central**: For examples and tutorials on SDR and communication systems.

- **NS-3 Tutorials**: For network simulation examples and guides.

- **GNU Radio Wiki**: For SDR implementation examples.

By following this structured approach, you can effectively simulate and analyze SDR-based MANET military communications, adapting to dynamic environments and various data transport requirements.

Thanks Hussein, am definitely going to simulate this environment.

The following information would first be needed to build a MANET communication network scenario:

Environment Size: Define the area, e.g., 10km x 10km* 1km

Nodes. Number: e.g., 10-20 nodes, Type: Mobile, stationary, etc.

Node Mobility. Initial positions: (x, y, z) coordinates for each node.

Mobility model: Random waypoint, group mobility, predefined paths with trajectory data (time-stamped (x, y, z) coordinates for each mobile node)

Traffic Model. Applications: Define types (e.g., VoIP, video streaming, file transfer). Sources and destinations: Specify node pairs for each application (e.g., N1 to N4, N2 to N5)

Packet Generation Rate, Packet sizes, Packet interarrival time

Routing Protocol: DSR, AODV, OLSR

MAC and PHY Layers: CSMA, TDMA, etc.

Radio Propagation Model. Simple: Range-based reachability with fixed transmission range, or Detailed: Path loss models (e.g., Free Space, Two-Ray Ground, Log-distance) with Fading and Shadowing

Antenna characteristics: Omnidirectional or directional, gain patterns

Metrics to collect: Throughput, latency, packet delivery ratio, energy consumption, etc.

You can look these links

https://tetcos.com/military-radio.html

https://tetcos.com/manet-vehicular-radio.html

How can I observe route changes due to variations in SNR? Can we visualize how routes adapt as signal strengths of intermediate nodes change? What is the impact on network performance when nodes dynamically join or leave during operation?

Nihal Sanil For example in the case of OLSR, change in SNR causes changes in connectivity, which lead to updates in the MPR (Multi-Point Relay) set. These MPR changes subsequently result in route updates in the network.

SNR variations can be observed in the radio measurements log, while changes in the MPR set are recorded in the network log. The impact on routes can be analyzed by examining the packet trace, which shows the old and new paths taken by packets as the network adapts to connectivity variations.

Sujata Dhumal Thank you for your answer.

The scenario I am running has OLSR for L3 routing and dynamic TDMA for L2 MAC. How can I predict the throughput of the dynamic TDMA MAC layer? With many nodes and various traffic flows per node, how can I verify the results provided by NetSim?

Nihal Sanil To predict the throughput of the dynamic TDMA MAC layer, you should analyse the following logs:

• TDMA Slot Allocation Log: Understand how slots are allocated to each node.
• OLSR Logs: Examine the route, neighbor, and MPR logs to identify the paths used for communication.
• Packet Trace: Analyze the packet flows, including transmission times and packet delivery status.

You can use ChatGPT to write Python scripts to process and correlate these logs. The scripts can extract slot utilization, end-to-end routes, and traffic flow patterns, enabling you to verify the results provided by NetSim.

Thank you for all the details information. It was quite helpful. I have a follow-on question: can you let me know how is the Bit Error Rate (BER) in the PHY computed in NetSim?

Nihal Sanil The propagation models PDF in https://tetcos.com/netsim-documentation.html explains the BER calculations.

Another option is to ask NetSim AI https://tetcos.com/netsimai.html