wiki:Tutorials/Wireless/GNURadioCFOEstimation

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GNURadio CFO Estimation tutorial

Description

This tutorial illustrates the use of GNURadio flowgraphs to estimate the Carrier Frequency offset between a pair of USRPs in COSMOS, ORBIT testbeds.

Prerequisites

In order to access the test bed, create a reservation and have it approved by the reservation service. Access to the resources is granted after the reservation is confirmed. Please follow the process shown on the COSMOS getting started page to get started.

Resources required

2 USRPs in COSMOS or ORBIT testbed, 2 host nodes, and 2 mmWave devices(if using mmWave) are required. This page uses the 28GHz IBM mmWave devices in ​sb1.cosmos-lab.org. As shown in the ​basic tutorial for IBM 28GHz devices, the current connections in SB1 are as shown in this ​diagram

  • sdr1-in1 RF2 TX/RX — rfdev4-in1 all ICs/TX/H, sdr1-in1 RF2 RX2 — rfdev4-in1 all ICs/RX/H
  • sdr1-in1 RF3 TX/RX — rfdev4-in1 all ICs/TX/V, sdr1-in1 RF3 RX2 — rfdev4-in1 all ICs/RX/V
  • sdr1-in2 RF2 TX/RX — rfdev4-in2 all ICs/TX/H, sdr1-in2 RF2 RX2 — rfdev4-in2 all ICs/RX/H
  • sdr1-in2 RF3 TX/RX — rfdev4-in2 all ICs/TX/V, sdr1-in2 RF2 RX2 — rfdev4-in2 all ICs/RX/V

Hence, the resources required to execute this tutorial are rfdev4-in1, rfdev4-in2 (IBM PAAMs), sdr1-in1, sdr1-in2 (USRP N310s), srv1-lg1, srv2-lg1 in sb1.cosmos-lab.org.

Tutorial Setup

Follow the steps below to gain access to the sandbox console and set up nodes with appropriate images.

  1. If you don't have one already, sign up for a ​COSMOS account
  2. Create a resource reservation on COSMOS SB1
  3. Login into sandbox console (console.sb1.cosmos-lab.org with two SSH sessions.
  4. Make sure all the nodes and devices used in the experiment are turned off. 
    omf tell -a offh -t sdr1-in1,sdr1-in2,rfdev4-in1,rfdev4-in2,srv1-lg1,srv2-lg1
  5. Use the gnuradio_ofdm.ndz node image with Ubuntu 20.04, UHD 4.4, gnuradio 3.9, and a grc example used in this tutorial. Load gnuradio_ofdm.ndz on the servers. 
    omf load -i gnuradio_ofdm.ndz -t srv1-lg1,srv2-lg1
  6. Turn all the required resources on and check the status of all the resources. Use the following commands . 
    omf tell -a on -t sdr1-in1,sdr1-in2,rfdev4-in1,rfdev4-in2,srv1-lg1,srv2-lg1

    omf stat -t all
  7. ssh to the server with option -Y for using GUI with gnuradio. 
    ssh -Y root@srv1-lg1

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