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
9 years ago
Last modified on Sep 24, 2015, 3:40:53 PM
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