Difference between revisions of "GFSK Mod"

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(Created page with "Category:Block Docs Category:Stub Docs This is the template for the "Page-per-block Docs". This first section should describe what the block...")
 
(Make it clearer how to replicate the results on the flowgraph)
 
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[[Category:Block Docs]]
 
[[Category:Block Docs]]
[[Category:Stub Docs]]
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Hierarchical block for Gaussian Frequency Shift Key (GFSK) modulation.
This is the template for the [[:Category:Block_Docs|"Page-per-block Docs"]].  This first section should describe what the block does and how to use it, using however many paragraphs necessary.  Note that the title of the wiki page should match the block's name in GRC, i.e. the one defined in the block's .grc file.  Look at the [[FFT]] Block for a good example.
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The input is a byte stream (unsigned char) and the output is the complex modulated signal at baseband.
  
As this is a basic template, it's also in the [[:Category:Stub_Docs|"Stub Docs category"]]. Please improve it.
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== Parameters ==
  
== Parameters ==
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; Samples/Symbol
(''R''): <span class="plainlinks">[https://wiki.gnuradio.org/index.php/GNURadioCompanion#Variable_Controls ''Run-time adjustable'']</span>
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: Samples per baud >= 2 (integer)
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; Sensitivity
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: Given to the [[Frequency Mod]]
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; BT
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: Gaussian filter bandwidth * symbol time (float)
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; Verbose
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: Print information about modulator?
  
; Param 1 (''R'')
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; Log
: Description of parameter, provide any tips or recommended values.  Note that the name of the parameter above should match the param's label that shows up in grc (e.g. Sample Rate).
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: Print modulation data to files?
  
; Param 2
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; Unpack
: blah blah blah
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: Unpack input byte stream?
  
 
== Example Flowgraph ==
 
== Example Flowgraph ==
  
Insert description of flowgraph here, then show a screenshot of the flowgraph and the output if there is an interesting GUI. Currently we have no standard method of uploading the actual flowgraph to the wiki or git repo, unfortunately.  The plan is to have an example flowgraph showing how the block might be used, for every block, and the flowgraphs will live in the git repo.
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The flowgraph below shows an example of the GFSK Mod and GFSK Demod blocks in action. We GFSK modulate 9-bit long bit stream '000111011', and then GFSK demodulate it. Then we compare the two bit streams to make sure that they are the same.
  
== Source Files ==
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[[File:Gfsk_mod_and_demod.png|800px]]
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When the flowgraph runs, we see that the red and blue signals are the same, meaning that the bit streams before and after the GFSK modulation and demodulation are the same.
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In order to replicate the results shown below, make sure you do the following:
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# Make sure you have a vector of 9 bits in your vector source. For example, I used (0,0,0,1,1,1,0,1,1) in this example.
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# Make sure you turn off the unpack function in the GFSK Mod block. You will need to double click the block to bring up the Properties pop-up in order to turn it off. Turn it off. Then you will see "Unpack: Off" show up on the block after you close its Properties pop-up.
  
; C++ files
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[[File:Gfsk_mod_and_demod_in_action.png|800px]]
: [https://github.com/gnuradio/gnuradio TODO]
 
  
; Header files
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== Source Files ==
: [https://github.com/gnuradio/gnuradio TODO]
 
  
; Public header files
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; Python files
: [https://github.com/gnuradio/gnuradio TODO]
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: [https://github.com/gnuradio/gnuradio/blob/master/gr-digital/python/digital/gfsk.py]
  
 
; Block definition
 
; Block definition
: [https://github.com/gnuradio/gnuradio TODO]
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: [https://github.com/gnuradio/gnuradio/blob/master/gr-digital/grc/digital_gfsk_mod.block.yml]

Latest revision as of 23:46, 23 August 2021

Hierarchical block for Gaussian Frequency Shift Key (GFSK) modulation.

The input is a byte stream (unsigned char) and the output is the complex modulated signal at baseband.

Parameters[edit]

Samples/Symbol
Samples per baud >= 2 (integer)
Sensitivity
Given to the Frequency Mod
BT
Gaussian filter bandwidth * symbol time (float)
Verbose
Print information about modulator?
Log
Print modulation data to files?
Unpack
Unpack input byte stream?

Example Flowgraph[edit]

The flowgraph below shows an example of the GFSK Mod and GFSK Demod blocks in action. We GFSK modulate 9-bit long bit stream '000111011', and then GFSK demodulate it. Then we compare the two bit streams to make sure that they are the same.

Gfsk mod and demod.png

When the flowgraph runs, we see that the red and blue signals are the same, meaning that the bit streams before and after the GFSK modulation and demodulation are the same.

In order to replicate the results shown below, make sure you do the following:

  1. Make sure you have a vector of 9 bits in your vector source. For example, I used (0,0,0,1,1,1,0,1,1) in this example.
  2. Make sure you turn off the unpack function in the GFSK Mod block. You will need to double click the block to bring up the Properties pop-up in order to turn it off. Turn it off. Then you will see "Unpack: Off" show up on the block after you close its Properties pop-up.

Gfsk mod and demod in action.png

Source Files[edit]

Python files
[1]
Block definition
[2]