Call Us: +91 76760 54321

Underwater Acoustic Networks (UAN)

Overview

NetSim’s Underwater acoustic networks library enables users to design, simulate and analyze performance of underwater networks that use acoustic communication.

NNetSim UAN

Features

  • Architecture & Integration
    • Seamless integration with other NetSim components.
    • NetSim Component #12 is Underwater Acoustic Networks (UWAN).
    • Available with the standard and pro versions.
    • Dependency: Requires Component #2 (Legacy Networks) for operation.
    • Emulation capability available
  • Network Stack
    • Entire 5-layer TCP/IP network stack is modelled in each device
  • L5 - Application Layer
    • Offers a sensor application designed with small packet sizes and large inter-arrival times, suitable for underwater applications.
    • Supports other NetSim applications like voice, video, FTP, etc. Users should consider the very low bit rates typical of UWANs.
  • L4 - Transport layer
    • Implements the UDP protocol.
  • L3 - Network layer
    • Single-hop transmissions require no routing configuration.
    • For multi-hop transmissions, static routing configuration is necessary.
    • Ad hoc (MANET) routing is on the roadmap for future releases.
    • Devices can currently communicate only within the UWAN. External connectivity via a gateway is under development for future releases.
  • L2 - MAC layer
    • Uses the Slotted Aloha protocol.
    • TDMA/DTDMA protocols are planned for future updates.
  • L1 - PHY Layer
    • Features the Underwater Acoustic PHY Model.
    • Considers propagation delay based on the speed of sound influenced by water temperature, depth, and salinity.
    • Supports modulation schemes: BPSK, QPSK, FSK, 16-QAM, 32-QAM, and 64-QAM.
    • Allows user-configurable data rates and bandwidth.
    • Utilizes SNR for packet reception, calculating BER from SNR-BER curves after factoring in propagation losses.
    • Implements the Thorp Propagation Model, allowing users to configure parameters such as temperature, depth, salinity, surface wind speed, turbulence, and shipping noise.
  • Typical simulation parameters
    • Source Level: 170-225 dB//1 𝜇𝑃a
    • Antenna Gain
    • Forward error correction coding
    • Coding Rates: 1/2, 2/3,3/4,5/6
    • Frequency: 0.01 to 1000kHz
    • Data Rate upto 255 kbps
    • Min Receiver Sensitivity -120 dB//1 𝜇𝑃a
    • Bandwidth upto 1000 Hz
  • Mobility Models for Underwater Sensors
    Users have the ability to configure different mobility models for underwater sensors, including:
    • Random Waypoint
    • Random Walk
    • File-Based
  • Statistics Overview
    NetSim provides detailed summary statistics that cover various metrics:
    • Throughput
    • Delay
    • Error rates
    Both at the link level and on a per-application basis.
  • Trace and logs
    • NetSim offers comprehensive packet and event tracing capabilities, allowing for deep network analysis and performance evaluation.
    • Acoustic measurement log that records Tx-Rx Distance, Tx Power, Pathloss, Total Noise, SNR, Rx Power and BER for each transmission
  • Source Code Accessibility
    • Protocol source C codes are provided.
    • Users can adapt the underlying codes using the MS Visual Studio development environment for specific requirements or enhancements.
  • Integration Capabilities
    • NetSim supports socket-based external interfacing to MATLAB, allowing users to expand their simulation and analysis capabilities.
NNetSim UAN Results

Multihop Routing Project: Depth Based Routing (DBR)

  • Detailed documentation (PDF) along with link to source code
  • Key Concept: DBR uses depth information for packet forwarding, where nodes only forward packets if they are closer to the water surface than the previous node.
  • Implementation Details: The project includes code modifications to DSR protocol in NetSim to implement DBR, along with holding time calculations and packet queue management.
  • Simulation Cases: Multiple scenarios are simulated to demonstrate different aspects of DBR, including single-hop transmission, void zones, nodes at same depth, and multi-application scenarios.
  • Insights: The simulations reveal some limitations of DBR, such as potential issues with nodes at similar depths, the impact of horizontal distance on packet propagation, and challenges when using DBR over Slotted Aloha MAC protocol.

Useful Links