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    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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hamming_SyndromeTable.vi

Module by: Ed Doering. E-mail the author

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Summary: Build a LabVIEW subVI to create the syndrome table for the (n,k) Hamming linear block code channel decoder.

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: hamming_SyndromeTable.vi

  • Description: Create the syndrome table for the Hamming block code channel decoder. The table contains the most likely error patterns indexed by syndrome number.
  • Category: Hamming (n,k) block code ("hamming" prefix)

Inputs (Controls)

  1. HT matrix, n by q -- Real Matrix

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

Outputs (Indicators)

  1. syndrome table -- Boolean 2-D array

Required Behavior

  • Determine the number of checkbits "q" from the dimensions of matrix HT.
  • "Most likely" error patterns are the no-error pattern and all possible single-bit error patterns.
  • Syndrome table is an array of most likely error patterns indexed according to the associated syndrome number. For example, suppose the error pattern FFTFFFF was found to produce a syndrome value TTF. Retrieving the array value of syndrome table at index "3" will then produce the Boolean array FFTFFFF. Note that the syndrome pattern is converted to an integer using the built-in LabVIEW node "Boolean Array to Number" which assumes the first element in the Boolean array is the least significant bit.

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 hamming_SyndromeTable.vi
Figure 1 (subVI_hamming_SyndromeTable-vi.htm)

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