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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 […]"

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pam_TransmitSync.vi

Module by: Ed Doering. E-mail the author

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Summary: Build a LabVIEW subVI to create transmitter sync pulses to indicate the start and end of a bit interval.

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: pam_TransmitSync.vi

  • Description: Create transmitter sync pulses to indicate the start and end of a bit interval. Also report the samples per bit interval.
  • Category: Pulse amplitude modulation ("pam" prefix)

Inputs (Controls)

  1. message length (10) -- I32
  2. Tb, bit interval [s] (1) -- DBL
  3. fs, sampling frequency [Hz] (10) -- DBL

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

Outputs (Indicators)

  1. start bit interval -- 1-D array of Boolean
  2. end bit interval -- 1-D array of Boolean
  3. samples per bit interval -- I32

Required Behavior

  • samples per bit interval indicates Tb times fs sample points.
  • start bit interval and end bit interval each contain message length times samples per bit interval elements in which T indicates the boundary of a bit interval.
  • The first element of start bit interval is T. The remaining elements for the bit interval are F.
  • end bit interval is similar to start bit interval, except the T element occurs at the end of a bit interval.

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 pam_TransmitSync.vi
Figure 1 (subVI_pam_TransmitSync-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?

Lens makers point to Connexions materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

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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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