Example Code

Baseband Phase-Locked Loop (PLL) Measurements

Products and Environment

This section reflects the products and operating system used to create the example.

To download NI software, including the products shown below, visit ni.com/downloads.

    Software

  • LabVIEW Modulation Toolkit

Code and Documents

Attachment

Description

Overview


The Modulation Toolkit PLL attempts to track the unknown phase of an input complex exponential tone by means of a feedback control system. At steady state, when the phase locked loop (PLL) has acquired lock to the input signal, the PLL estimates the offset of the input signal carrier phase and carrier frequency from the reference phase and frequency. This example demonstrates the operation of the PLL for a baseband signal. This program is a shipping example VI included with the Modulation Toolkit for NI LabVIEW.

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 of LabVIEW 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 Analysis and Signal Processing with LabVIEW.

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.



Related Links

Example code from the Example Code Exchange in the NI Community is licensed with the MIT license.