== Spectrum sensing with USRP2 and wiserd (OEDL and OML) == [[TOC(Tutorials/k0SDR*)]] === Description === We'll use the nodes on sandbox 3 to transmit a predefined waveform and receive the spectrum data into an OML file. === Hardware / Software Resources utilized === 1. Grid nodes with a USRP2 connect via Ethernet. 2. ''ubuntu-14-04-64bit-sdr.ndz'': disk image loaded onto nodes. 3. [http://wiser.orbit-lab.org/wiki/wiser/mSoftware/aWiserd Wiserd] - interface to configure and stream data to/from USRPs. === Transmit predefined tone === To get started load ''ubuntu-14-04-64bit-sdr.ndz'' onto node1-1 and node1-2. Then turn both nodes on. Set up node1-1 to configure transmit a predefined sine wave {{{ node1-1> wiserd > --uhd_tx_freq 700e6 --uhd_tx_rate 5e6 --uhd_tx_gain 20 > --tran_wavetype SINE --tran_wavefreq 1e6 --tran_amplitude 0.5 > --addmodule waveform }}} At this point the node1-1 should be transmitting a tone at 1MHz from the 700MHz center frequency. From node1-2, use the UHD spectrum utility to verify the waveform {{{ node1-2> cd uhd/host/build/examples/ node1-2> ./rx_ascii_art_dft --freq 700e6 --rate 5e6 --gain 20 --ref-lvl -40 }}} === Record spectrum data to an OML file === Now let's use wiserd to record this spectrum data into a local {{{ node1-2> wiserd > --uhd_rx_freq 700e6 --uhd_rx_rate 5e6 --uhd_rx_gain 20 --recv_running_time 2000 > --recv_numbins 256 --recv_avgwinlen 5 --recv_oml_servername file --recv_oml_output_type vector > --addmodule fftmovingavgoml --timed }}} Wiserd should record spectrum data to ''file'' for 2000ms and then stop recording. The recorded file can ve very large so a short snippet is shown below {{{ protocol: 5 domain: spectrum start-time: 1432751617 sender-id: app-name: spectrum schema: 0 _experiment_metadata subject:string key:string value:string schema: 1 _client_instrumentation measurements_injected:uint32 measurements_dropped:uint32 bytes_allocated:uint64 bytes_freed:uint64 bytes_in_use:uint64 bytes_max:uint64 schema: 2 spectrum_data sampling:int32 cfreq_MHz:double gain_dB:int32 FFTLength:int32 FFTNum:string FFTBins:[double] content: text 0.805870 2 1 5000000 700000000.000000 20 256 --- 256 0.00642503052949905 0.00640759989619255 0.00715913623571396 0.00693625304847956 0.00609686318784952 0.00611346587538719 0.00733797857537866 0.00742206443101168 0.00644569378346205 0.00748523231595755 0.00655230600386858 0.006748684681952 0.00692673865705729 0.00592925120145082 0.00748975854367018 0.00621710997074842 0.00608090776950121 0.0055550062097609 0.0057487809099257 0.00720828492194414 0.00618668925017118 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