wiki:Tutorials/Wireless/MassiveMIMO

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Massive MIMO Channel Sounding

Description

In this tutorial, we demonstrate the TDD 16x1 Massive MIMO channel sounding procedure using 1 Massive MIMO rack (8 USRP-X310s) and 1 USRP-B210 in the ​ORBIT grid and the ​RENEW Sounder software

  • The instructions of the RENEW Platform Sounder software can be found ​here under ​RENEW license.
  • The COSMOS team contributes to adding the UHD support for the Sounder software under the ​UHD license.

Author: Zhenzhou (Tom) Qi, Duke University (zhenzhou.qi [at] duke [dot] edu)

Last updated: Jul. 07, 2022

Prerequisites

In order to access grid, create a reservation in grid 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

  • 1 Massive MIMO Rack (node23-1 to node23-8)
  • 1 USRP-B210 (node8-7)
  • 1 Server (node21-1)

Tutorial Setup

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

  1. If you don't have one already, sign up for a ​ORBIT account
  2. Create a resource reservation on ORBIT grid
  3. Login into grid console (grid.orbit-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 node21-1,node8-7

    omf tell -a offh -t [23,1..8]
  5. Use the baseline-gr.ndz node image (see ​here for the list of pre-defined images) with Ubuntu 18.04, UHD 3.15, and gnuradio 3.8. Load baseline-gr.ndz on the server. 
    omf load -i baseline-gr.ndz -t srv2-lg1
  6. Turn all the required resources on and check the status 
    omf tell -a on -t sdr2-s1-lg1,sdr2-md1,srv2-lg1

    omf stat -t all
  7. Make sure that the RF switch port is set to using the USRP 2974's. If some of the RF switch ports are set to "2", set them back to "1" 
    curl "am1.cosmos-lab.org:5054/rf_switch/set?name=rfsw-s1-lg1.sb2.cosmos-lab.org,rfsw-md1.sb2.cosmos-lab.org&switch=1,2,3,4&port=1"
  8. ssh to the the same server from two terminals, use option -Y for using GUI. 
    [Terminal 1] ssh -Y root@srv2-lg1,
[Terminal 2] ssh -Y root@srv2-lg1

Experiment Execution

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