Pulse Modulation Spectrum with the NI-5660 Instrument Driver
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This example demonstrates spectral (frequency-domain) analysis of acquired I/Q data and of the demodulated PM signal. The example first configures the NI 5660 RF vector signal analyzer in terms of modulation-domain parameters.
Depending on your settings, this example acquires either intermediate frequency (IF) or I/Q data directly from the digitizer module, which is part of the NI 5660. If the VI acquires IF data from the hardware, the IF to I/Q downconversion is done in software using the MT Convert IF to IQ VI.
The recovered PM information signal is plotted on the PM Demodulated Waveform graph, the IQ Spectrum graph shows the spectrum of the I-Q data, and the PM Spectrum graph displays the spectrum of the demodulated PM signal.
In this example, the SMT Zoom FFT and Unit Conversion VIs are used to calculate the power spectrum of the I/Q data. This program is a shipping example VI included with the NI Spectral Measurements Toolkit and Modulation Toolkit for LabVIEW.
This Virtual Instrument is designed to work with the NI PXI-5660 RF vector signal analyzer. Please refer to the product page for the NI PXI-5660 for more information.
This software is written in LabVIEW, a graphical programming language designed for scientists and engineers. For more information about LabVIEW, visit ni.com/labview.
More information on National Instruments signal processing can be found at the Signal Processing Resource Center.
Downloads
Filename: mt_ni5660_pm_spectrum1.vi
Front Panel
This is a picture of the VI front panel. To view the block diagram and additional documentation, download the attached file.
This example requires LabVIEW and the NI Modulation Toolkit. If you do not have access to these software applications, you can always try them out online at the LabVIEW Online Evaluation.
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This example program (this "program") was developed by a National Instruments ("NI") Applications Engineer. Although technical support of this program may be made available by National Instruments, this program may not be completely tested and verified, and NI does not guarantee its quality in any way or that NI will continue to support this program with each new revision of related products and drivers. THIS EXAMPLE PROGRAM IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND AND SUBJECT TO CERTAIN RESTRICTIONS AS MORE SPECIFICALLY SET FORTH IN NI.COM'S TERMS OF USE (http://ni.com/legal/termsofuse/unitedstates/us/).