wiki:Tutorials/Wireless/mimoRadar

Version 4 (modified by akleniatis, 5 months ago) ( diff )

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mmWave OFDM based ISAC Tutorial

Description

This tutorial demonstrates how to perform an mmWave OFDM based ISAC (Integrated Sensing and Communications) experiment using COSMOS radar SDR nodes and a mobile PAAM receiver.

  1. mmWave OFDM based ISAC Tutorial
    1. Description
    2. Prerequisites
    3. Related COSMOS Documentation
    4. Resource Requirements
    5. Setup
      1. Screenshot Placeholder
    6. Execution
      1. Radar Side (srv1-lg1)
      2. Screenshot Placeholder
    7. Calibration
    8. Radar Transmission
    9. Mobile PAAM Receiver (mob4-1)

Prerequisites

  • COSMOS account and reservation established
  • Access to the radar SDR nodes and PAAM mobile node
  • Chrome Remote Desktop for graphical access

Related COSMOS Documentation

Resource Requirements

  • Server: srv1-lg1
  • Mobile PAAM: mob4-1
  • SDRs: sdr1-radar, sdr2-radar
  • PAAMs: rfdev-sdr1-radar, rfdev-sdr2-radar
  • OMF Image: ubuntu2004-uhd4.3-gr3.8-paam-radar-new.ndz

Setup

Load the required images onto the server and mobile PAAM: 

omf load -i ubuntu2004-uhd4.3-gr3.8-paam-radar-new.ndz -t srv1-lg1
omf load -i ubuntu2004-uhd4.3-gr3.8-paam-radar-new.ndz -t mob4-1

Power on the experiment hardware: 

omf tell -a on -t sdr1-radar,rfdev-sdr1-radar,sdr2-radar,rfdev-sdr2-radar,mob4-1,srv1-lg1

Connect to the server: 

ssh root@srv1-lg1

Run the PAAM setup script: 

cd IBM_PAAM_Software_vFINAL/examples/
python3 paam_radar_setup.py

Connect via Chrome Remote Desktop and choose GNOME on Xorg.

Screenshot Placeholder

No image "mmwave_setup_placeholder.png" attached to Tutorials/Wireless/mimo Radar

Execution

Radar Side (srv1-lg1)

Terminal 1 network configuration and radar application: 

sudo ip link set dev eno1 mtu 9000
sudo sysctl -w net.core.wmem_max=25000000
O-JRC/examples/build-mimo-ofdm-packet-generator-Desktop-Debug/mimo-ofdm-packet-generator

Configure signal parameters:

  • Carrier Frequency: 28 GHz
  • Sample Rate: 100 MHz
  • Packet size: 50 bytes
  • TX Antennas: 2

Press Start once configured.

Screenshot Placeholder

No image "signal_parameters_placeholder.png" attached to Tutorials/Wireless/mimo Radar

Terminal 2: 

gnuradio-companion

Calibration

Open the calibration flowgraph:

  • O-JRC/examples/usrp/V0_JRC_calibration.grc

Verify calibration parameters:

  • Variables
    • usrp_freq: 3e9
    • samp_rate: 100e6
    • rf_freq: 28e9
  • usrp_mimo_trx
    • Number of TX: 2
    • Number of RX: 2
    • Number of MBoards: 2
    • USRP Arguments: "addr0=10.38.24.1, addr1=10.38.24.2, master_clock_rate=200e6"
    • Clock Sources: "internal,external"
    • Time Sources: "internal,external"

Execute the flowgraph and adjust the following parameters until waveforms are aligned:

  • RX2 Gain
  • RX2 Phase

Record these calibration values.

Terminate flowgraph.

Radar Transmission

Open TRX flowgraph:

  • O-JRC/examples/usrp/V1_JRC_TRX.grc

Update defaults for:

  • amp_rx2 = calibrated gain
  • phase_rx2 = calibrated phase

Run radar transmission.

Mobile PAAM Receiver (mob4-1)

Terminal setup: 

sudo ip link set dev eno1 mtu 9000
sudo sysctl -w net.core.wmem_max=25000000
curl "http://am1.orbit-lab.org:5054/array_mgmt/configure?dev_name=rfev-mob4-1.sb1.cosmos-lab.org&ics=all&num_elements=16&txrx=rx&pol=h&theta=0&phi=0"

Launch GRC: 

gnuradio-companion

Open RX Flowgraph:

  • O-JRC/examples/usrp/V1_JRC_RX.grc

Check parameters:

  • Variables
    • usrp_freq: 3e9
    • samp_rate: 100e6
    • rf_frequency: 28e9
  • UHD Source
    • Device Address: "serial=31557B9,master_clock_rate=200e6"
    • Device Arguments: "resource:RIO0"
    • Mb0: Subdev Spec: "A:0"

Execute to receive the OFDM data.

Note: See TracWiki for help on using the wiki.