wiki:Tutorials/k0SDR/Tutorial04a

Version 9 (modified by nilanjan, 10 years ago) ( diff )

Spectrum sensing with USRP2

Description

In this tutorial we'll use the USRPs on the grid for FFT-based spectrum sensing. Each USRP (centered on a frequency with specified bandwidth) will collect data into an OML server for post processing. For details on available USRP2s on the grid, please see available USRP2 HW.

Hardware / Software Resources utilized

  1. Grid nodes with a USRP2 connect via Ethernet.
  2. ubuntu-11-10-gnuradio.ndz: disk image loaded onto nodes. This image has all the precompiled - software required to configure the USRPs and analyze recorded data. The USRP2's interface with the node is already configured.
  3. spectrum: application on node to set up & collect data from USRP2 and send to OML server / local file for recording in database file.
  4. spectrum_console: application on console to configure & initiate spectrum sense application on node.
  5. Orbit's Arbitrary Waveform Injection System: used to inject noise or simple signal into RF environment. More information of this generator can be found here.

Set up

  • After logging into grid console, make sure all nodes are turned off
    nilanjan@console.grid:~$ omf-5.3 tell -a offh -t system:topo:n210
    
  • Verify state of node before continuing. Make sure all nodes are in the POWEROFF state.
    nilanjan@console.grid:~$ omf-5.3 stat
    
  • Image nodes
    nilanjan@console.grid:~$ omf-5.3 load -i ubuntu-11-10-gnuradio.ndz -t system:topo:n210
    
  • After nodes are imaged, verify that nodes are in POWEROFF state. Otherwise issue the following to turn them off for a reboot
    nilanjan@console.grid:~$ omf-5.3 tell -a offh -t system:topo:n210
    
  • Turn nodes back on and verify they are in POWERON state
    nilanjan@console.grid:~$ omf-5.3 tell -a on -t system:topo:n210
    
  • Before proceeding, download the spectrum console application code to your local directory. This is the application that will invoke the application to configure the USRP on the nodes.
    nilanjan@console.grid:~/UHD/SPECTRUM/w$ wget http://www.orbit-lab.org/raw-attachment/wiki/Documentation/GNURadio/Tutorials/FFTSpectrum/spectrum_console.cpp
    
  • Compile the application code.
    nilanjan@console.grid:~/UHD/SPECTRUM/w$ g++ spectrum_console.cpp -lboost_program_options-mt -loml2 -o spectrum_console
    

Spectrum sensing the noise floor

  • To view the available parameters for the console application
    nilanjan@console.grid:~/UHD/SPECTRUM/w$ ./spectrum_console --help
    
  • The first run will demonstrate how to use the sensing application on multiple nodes centered at different frequencies. In this case we will not inject noise into the environment. Check the following page to view nodes corresponding to usrp n210.
    In this case we'll be sensing on node3-3, node8-8, node13-13 on the frequencies 5.0 GHz, 5.1 GHz, 5.2 GHz respectively.
    Sampling rate option (—rate 16e6) yields a bandwidth of 8MHz.
    The fft size (—num-bins 1024) corresponds to a 1024 point fft.
    The time option (—time 5) runs the application for 5 seconds. Since the —oml file option is used the collected data will be store on the node locally.
    nilanjan@console.grid:~/UHD/SPECTRUM/w$ ./spectrum_console --rate 16e6 --num-bins 1024 --time 5 --oml file --node node3-3,node8-8,node13-13 --freq 5.0e9,5.1e9,5.2e9
    
  • The recorded spectrum data is stored in a file under the root directory on each of the nodes. Copy that data file from the node to the console and check the contents. The following will copy the data collect from node3-3.
    nilanjan@console.grid:~/UHD/SPECTRUM/w$ scp root@node3-3:/root/spectrum_measurement_node3-3 .
    
  • The contents of the file is very long. The full contents of an example run can be view here. Otherwise a very short snippet is shown below.

The last 2 rows in the snippet correspond to a unique recording from the USRP. The values from 8000000 and onward have the following format:
| sampling rate | center frequency | receiver gain (dBm) | fft length | dummy string | mag_bin0 | … | mag_bin1023|

protocol: 3
experiment-id: spectrum_measurement
start_time: 1355851232
sender-id: nodeŴ
app-name: spectrum
schema: 1 spectrum_packet_info sampling:int32 cfreq_MHz:double gain_dB:int32 FFTLength:int32 FFTNum:string bin_0:double bin_1:double bin_2:double bin_3:double bin_4:double bin_5:double bin_6:double bin_7:double bin_8:double bin_9:double bin_10:double bin_11:double bin_12:double bin_13:double bin_14:double bin_15:double bin_16:double bin_17:double bin_18:double bin_19:double bin_20:double bin_21:double bin_22:double bin_23:double bin_24:double bin_25:double bin_26:double bin_27:double bin_28:double bin_29:double bin_30:double bin_31:double bin_32:double bin_33:double bin_34:double bin_35:double bin_36:double bin_37:double bin_38:double bin_39:double bin_40:double bin_41:double bin_42:double bin_43:double bin_44:double bin_45:double bin_46:double bin_47:double bin_48:double bin_49:double bin_50:double bin_51:double bin_52:double bin_53:double bin_54:double bin_55:double bin_56:double bin_57:double bin_58:double bin_59:double bin_60:double bin_61:double bin_62:double bin_63:double 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bin_991:double bin_992:double bin_993:double bin_994:double bin_995:double bin_996:double bin_997:double bin_998:double bin_999:double bin_1000:double bin_1001:double bin_1002:double bin_1003:double bin_1004:double bin_1005:double bin_1006:double bin_1007:double bin_1008:double bin_1009:double bin_1010:double bin_1011:double bin_1012:double bin_1013:double bin_1014:double bin_1015:double bin_1016:double bin_1017:double bin_1018:double bin_1019:double bin_1020:double bin_1021:double bin_1022:double bin_1023:double 
content: text

0.016691	1	1	8000000	5000000000.000000	15	1024	---	1.757063	0.005711	0.006383	0.004498	0.002031	0.00315 	0.001641	0.003100	0.004129	0.003080	0.003610	0.003025	0.005008	0.000638	0.002165	0.004431	0.005030	0.005431	0.004888	0.002392	0.003687	0.004076	0.001304	0.007801	0.001708	0.002036	0.001064	0.003183	0.004257	0.008325	0.002652	0.009097	0.004770	0.002607	0.002555	0.006493	0.007471	0.004019	0.008341	0.00680 	0.003433	0.005618	0.004823	0.003156	0.005236	0.007089	0.003444	0.004501	0.007884	0.002749	0.004453	0.006135	0.005964	0.001678	0.009310	0.012970	0.001340	0.003497	0.007509	0.001908	0.004840	0.006835	0.005085	0.008433	0.003541	0.005685	0.003238	0.004289	0.003663	0.001036	0.003411	0.006862	0.002740	0.00050 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  • Plot of the noise floor across multiple node.

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