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  • LV Digital Comm display tagshide tags

    This module is included inLens: Analog / Digital Communications with National Instruments LabVIEW
    By: Sam ShearmanAs a part of collections:"SubVI Specifications for "Communication Systems Projects with LabVIEW"", "Communication Systems Projects with LabVIEW"

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    ""Communication Systems Projects with LabVIEW" features ten projects that draw upon a library of over 40 subVIs constructed as part of the project activities. Each module in this manual completely […]"

    "Starting point collection that gathers all modules from this course"

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regen_BitSync.vi

Module by: Ed Doering. E-mail the author

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Summary: Build a LabVIEW subVI to recover a bitstream synchronization signal as an array of sampling instants.

Table 1
LabVIEWtop.png This module refers to LabVIEW, a software development environment that features a graphical programming language. Please see the LabVIEW QuickStart Guide module for tutorials and documentation that will help you:
• Apply LabVIEW to Audio Signal Processing
• Get started with LabVIEW
• Obtain a fully-functional evaluation edition of LabVIEW

Note:

Visit LabVIEW Setup to learn how to adjust your own LabVIEW environment to match the settings used by the LabVIEW screencast video(s) in this module. Click the "Fullscreen" button at the lower right corner of the video player if the video does not fit properly within your browser window.

LabVIEW SubVI: regen_BitSync.vi

  • Description: Recover a bitstream synchronization signal from a polar NRZ baseband signal as an array of sampling instants.
  • Category: Bitstream regeneration ("regen" prefix)

Inputs (Controls)

  1. signal in -- waveform
  2. bit rate [Hz] -- DBL

Parentheses ( ) indicate default value; square brackets [ ] designate units.

Outputs (Indicators)

  1. sampling instants -- Boolean 1-D array
  2. intermediate signals -- cluster of three waveforms: (1) absolute value, (2) bandpass filter, and (3) thresholded BPF

Required Behavior

  • Pass signal in through a "square-law" device (square the waveform), and then through a narrowband bandpass filter tuned to the bit rate.
  • Detect locations of negative-going zero crossings of the bandpass filter output and return as the Boolean array sampling instants.
  • Bundle the intermediate signals (square-law device output, bandpass filter output, and thresholded bandpass filter output) as the cluster intermediate signals.

LabVIEW Coding Tips

View the screencast video in Create a SubVI in LabVIEW to learn the mechanics of subVIs.

Refer to the Figure 1 screencast video for LabVIEW coding tips and techniques specific to this subVI.

Figure 1: [video] LabVIEW coding tips and techniques for regen_BitSync.vi
Figure 1 (subVI_regen_BitSync-vi.htm)

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A lens is a custom view of Connexions content. You can think of it as a fancy kind of list that will let you see Connexions through the eyes of organizations and people you trust.

What is in a lens?

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Who can create a lens?

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What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

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