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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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regen_NormalizeToPreamble.vi

Module by: Ed Doering. E-mail the author

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Summary: Build a LabVIEW subVI to normalize a received baseband signal according to the DC and RMS values of the preamble portion of the signal.

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_NormalizeToPreamble.vi

  • Description: Normalize a received baseband signal according to the DC and RMS values of the preamble portion of the signal. The preamble is assumed to be a region of alternating 1s and 0s (marks and spaces) that approximates a sinusoid. The DC offset and RMS values of the preamble are measured, and then used to normalize the entire signal.
  • Category: Bitstream regeneration ("regen" prefix)

Inputs (Controls)

  1. signal in -- waveform
  2. preamble -- waveform

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

Outputs (Indicators)

  1. normalized signal out -- waveform
  2. preamble DC value -- DBL
  3. preamble RMS value -- DBL

Required Behavior

  • Measure the DC (average) value of preamble.
  • Measure the RMS (root mean square) value of preamble.
  • Produce normalized signal out by (1) subtracting the DC value from signal in, (2) dividing by the RMS value, and (3) multiplying by the square root of 2. The resulting signal has approximately zero average value and lies approximately in the range ±.
  • Return the measured DC and RMS values as indicators.

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_NormalizeToPreamble.vi
Figure 1 (subVI_regen_NormalizeToPreamble-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.

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