Modulate Vector: Difference between revisions

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[[Category:Block Docs]]
[[Category:Block Docs]]
[[Category:Stub Docs]]
Modulate a vector of data and apply a shaping filter.
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.


As this is a basic template, it's also in the [[:Category:Stub_Docs|"Stub Docs category"]]. Please improve it.
This function modulates the input vector and applies a symbol shaping filter. It is intended for use with the corr_est_cc block as the symbol stream to correlate against.
 
Any differential encoding or other data coding must be performed on the input vector before this modulation operation.
 
Be aware that the format of the incoming data must match the format the modulator block is expecting. GNURadio modulator blocks are inconsistent in their data type expectations. For instance, cpmmod_bc expects unpacked,signed bytes in (-1, 1), while gmsk_mod expects packed,unsigned bytes in (0, 1). In other words, the output ofgmsk_mod given the input vector [0xaa, 0x00] is equivalent to the output of cpmmod_bc given the input vector [1,255,1,255,1,255,1,255,255,255,255,255,255,255,255,255]
 
Please check the documentation or source of the modulator before using this function.


== Parameters ==
== Parameters ==
(''R''): <span class="plainlinks">[https://wiki.gnuradio.org/index.php/GNURadioCompanion#Variable_Controls ''Run-time adjustable'']</span>


; Param 1 (''R'')
; Modulator
: 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).
: Pointer to a byte-to-complex modulator block
 
; Data vector
: Vector of bytes to modulate into symbols.


; Param 2
; Filter taps
: blah blah blah
: Post-modulation symbol shaping filter taps.


== 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.
This flowgraph can be found at [https://github.com/gnuradio/gnuradio/blob/main/gr-digital/examples/packet/example_corr_est_and_clock_sync.grc].
 
[[File:Test_corr_est_fg.png|800px]]


== Source Files ==
== Source Files ==


; C++ files
; C++ files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-digital/lib/modulate_vector.cc]
 
; Header files
: [https://github.com/gnuradio/gnuradio TODO]


; Public header files
; Public header files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-digital/include/gnuradio/digital/modulate_vector.h]


; Block definition
; Block definition
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-digital/grc/digital_modulate_vector.block.yml]

Latest revision as of 13:43, 2 August 2022

Modulate a vector of data and apply a shaping filter.

This function modulates the input vector and applies a symbol shaping filter. It is intended for use with the corr_est_cc block as the symbol stream to correlate against.

Any differential encoding or other data coding must be performed on the input vector before this modulation operation.

Be aware that the format of the incoming data must match the format the modulator block is expecting. GNURadio modulator blocks are inconsistent in their data type expectations. For instance, cpmmod_bc expects unpacked,signed bytes in (-1, 1), while gmsk_mod expects packed,unsigned bytes in (0, 1). In other words, the output ofgmsk_mod given the input vector [0xaa, 0x00] is equivalent to the output of cpmmod_bc given the input vector [1,255,1,255,1,255,1,255,255,255,255,255,255,255,255,255]

Please check the documentation or source of the modulator before using this function.

Parameters

Modulator
Pointer to a byte-to-complex modulator block
Data vector
Vector of bytes to modulate into symbols.
Filter taps
Post-modulation symbol shaping filter taps.

Example Flowgraph

This flowgraph can be found at [1].

Test corr est fg.png

Source Files

C++ files
[2]
Public header files
[3]
Block definition
[4]
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