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regen_Correlator.vi

Module by: Ed Doering. E-mail the authorEdited By: Sam Shearman, Erik Luther, Brett Hern

Summary: Build a LabVIEW subVI to demodulate a pulse-amplitude modulated (PAM) signal using a correlator.

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_Correlator.vi

  • Description: Demodulate a pulse-amplitude modulated (PAM) signal using a correlator. The correlator multiples the received signal by the same pulse shape used by the transmitter and integrates the product over the bit interval. A Boolean control indicates when to clear the integrator and restart the pulse. This subVI is intended for point-by-point operation within a repeating structure such as a for-loop or while-loop.
  • Category: Bitstream regeneration ("regen" prefix)

Inputs (Controls)

  1. signal in -- DBL
  2. fs [Hz] -- DBL
  3. start integrating -- Boolean
  4. pulse -- 1-D array of DBL

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

Outputs (Indicators)

  1. signal out -- DBL

Required Behavior

  • signal out is the time integral of the product of signal in and the pulse shape pulse. The integration is computed on a point-by-point basis, so each call to the subVI calculates only a single output value. The integrator output and position (index) within the pulse signal is preserved from one subVI call to the next.
  • When start integrating is T the integrator is reset and the pulse signal index is reset to zero, i.e., the beginning of the pulse shape array.

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_Correlator.vi
Figure 1 (subVI_regen_Correlator-vi.htm)

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Definition of a lens

Lenses

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

What is in a lens?

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

Who can create a lens?

Any individual member, a community, or a respected organization.

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.

| External bookmarks

Module to:

My Favorites (?)

'My Favorites' is a special kind of lens which you can use to bookmark modules and collections. 'My Favorites' can only be seen by you, and collections saved in 'My Favorites' can remember the last module you were on. You need an account to use 'My Favorites'.

| A lens I own (?)

Definition of a lens

Lenses

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

What is in a lens?

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

Who can create a lens?

Any individual member, a community, or a respected organization.

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.

| External bookmarks