This repository contains example code for generating outputs to recreate a number of issues on the USRP N300, UHD version 3.13.1

Questions: [email protected]

This program can be built directly on the N300. It is intended to run in embedded mode.

cd n300_txrx_pulse_test
mkdir build
cd build
cmake ../
make -j4

Tested with HG image:

uhd_image_loader --args "type=n3xx" --fpga-path=/usr/share/uhd/images/usrp_n300_fpga_HG.bit

From the n300_txrx_pulse_test/build directory:

./n300_txrx_pulse_test --freq 1e9 --txgain 35 --rxgain 30 --ch_tx 0 --ch_rx 0 --wavefile ../../waveforms/chirpN100.bin --file ../../outputs/usrp_samples_default_fpga_HG_image_spectrumtest_35db.dat

From the n300_txrx_pulse_test/build directory:

./n300_txrx_pulse_test --freq 1e9 --txgain 0 --rxgain 0 --ch_tx -1 --ch_rx 0 --nsamps 4096 --npulses 10 --wavefile ../../waveforms/chirpN100.bin --file ../../outputs/usrp_samples_default_fpga_HG_image_impulsetest.dat

A few waveform files can be found in n300_issue_tests/waveforms/. They are binary complex int16 format and should be saved with the .bin extension. They can be generated using matlab with the function n300_issue_tests/matlabtools/wave2file.m.

Output files should have the .dat extension. They can be read into matlab with the function n300_issue_tests/matlabtools/file2wave.m.

NOTE: I/Q sample ordering is swapped in the binary .dat and .bin files. So long as .dat is used for RX samples from the USRP and .bin is used for TX samples from file, the program/scripts will handle this.