Spectrum sensing with USRP2 and wiserd (OEDL and OML)

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. ​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

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