Zynq-based WISER platform - Spectrum sensing with multiple nodes (OEDL)
Table of Contents
- SDR Tutorials
Description
This tutorial demonstrates how to record spectrum on multiple nodes using an OEDL script.
Hardware / Software Resources utilized
- SB6 nodes with WISER platform.
- wiser_sb6_zedboard.ndz: disk image loaded onto nodes.
- wiserd application - Check here for more info.
Spectrum sensing with an OEDL script
- Follow the start-up instructions to program and setup the FPGAs on both the nodes.
- The following OEDL script resides on the console of SB6 and can be used to run spectrum sensing on both the nodes at once.
defProperty('radio',"zynq","") defProperty('rx_freq1', "800e6", "") defProperty('rx_freq2', "815e6", "") defProperty('rx_gain', "10", "") defProperty('rx_fft_bins',"256","") defProperty('rx_fft_scaling',"170","") defProperty('rx_fft_averaging',"256","") defProperty('start_fft',"0","") defProperty('time',10,"") require './wiserd.rb' defGroup('receiver', "node1-1.sb6.orbit-lab.org, node1-2.sb6.orbit-lab.org" ) do |node| node.addApplication("test:app:wiserd") do |app| app.setProperty('--radio',property.radio) if ((node).to_s.casecmp("node1-1.sb6.orbit-lab.org") == 0) app.setProperty('--zynq_rx_freq', property.rx_freq1) else app.setProperty('--zynq_rx_freq', property.rx_freq2) end app.setProperty('--zynq_rx_gain', property.rx_gain) app.setProperty('--zynq_fft_bins', property.rx_fft_bins) app.setProperty('--zynq_fft_scaling', property.rx_fft_scaling) app.setProperty('--zynq_avg_window', property.rx_fft_averaging) app.setProperty('--fft_engine',property.start_fft) end end onEvent(:ALL_UP_AND_INSTALLED) do |event| wait 5 info "Starting the Receiver" group("receiver").startApplications wait 1 property.start_fft = "1" wait property.time property.start_fft = "0" group("receiver").stopApplications Experiment.done end
- The script here takes the receive center frequencies and run time as parameters along with the number of fft bins etc. Run the script by typing
omf exec system:exp:zynq_spec_sense.rb --time 20
- Run tcpdump on the nodes to see packets coming from the zedboard to the node
root@node1-2:~# tcpdump -i eth2
- FFT bin data is collected in /zynq_rx_fft.bin on each of the nodes. These files can be copied to the console and the spectrum can be plotted using an octave script.
Last modified
10 years ago
Last modified on Sep 24, 2015, 3:40:53 PM
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