MT niScope Demodulate FM
PrintOverview
This example demonstrates demodulation of a frequency-modulated signal acquired using an NI-SCOPE digitizer. The example illustrates hardware configuration 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. 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 complex-envelope baseband data is then demodulated to retrieve the original information signal. You can perform measurements on the demodulated signal to calculate the frequency deviation of the original FM signal.
This program is a shipping example VI included with the Modulation Toolkit for NI LabVIEW.
This Virtual Instrument is designed to work with RF communications hardware from National Instruments. To find compatible hardware for this application, visit ni.com/rf.
This software is written in LabVIEW, a graphical programming language designed for scientists and engineers. For more information about LabVIEW, visit ni.com/labview.
Modulation Toolkit Example Programs
The National Instruments NI Modulation Toolkit For LabVIEW extends the built-in analysis capability ofLabVIEW with functions and tools for signal generation, analysis, visualization, and processing of standard and custom modulation formats. With this toolkit, you can rapidly develop custom applications for research, design, characterization, validation, and test of communications systems and components that modulate or demodulate signals. Applications for the Modulation Toolkit are numerous; it includes the modulation formats - AM, FM, PM, ASK, FSK, MSK, GMSK, PSK, QPSK, PAM, QAM - that are the foundation of numerous emerging wireless technologies such as 802.11 a/b/g, ZigBee (802.15.4), WiMax (802.16a), RFID, satellite communications, and commercial broadcast among others.
More information on National Instruments signal processing can be found at the Signal Processing Resource Center.
Downloads
Filename: niscope_demodulate_fm.vi
Requirements: View
Front Panel
This is a picture of the VI's front panel. To view the block diagram and additional documentation, download the attached file.
This example requires LabVIEW and the Modulation Toolkit. If you do not have access to these, you can always try them out online at the LabVIEW Online Evaluation.
Related Links
Requirements
Filename: niscope_demodulate_fm.vi
Software Requirements
Application Software: LabVIEW Full Development System 8.0
Toolkits and Add-Ons: LabVIEW Modulation Toolkit 4.0
Language(s): LabVIEW
Hardware Requirements
Hardware Group: High-Speed Digitizers (Scopes)
Driver: NI-Scope 3.4
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Legal
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/).