Continuous Phase Modulation: Difference between revisions

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[[Category:Block Docs]]
[[Category:Block Docs]]
[[Category:Stub Docs]]
Generic CPM modulator.
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.
The input of this block are symbols from an M-ary alphabet +/-1, +/-3, ..., +/-(M-1). Usually, M = 2 and therefore, the valid inputs are +/-1. The modulator will silently accept any other inputs, though. The output is the phase-modulated signal.


== Parameters ==
== Parameters ==
(''R''): <span class="plainlinks">[https://wiki.gnuradio.org/index.php/GNURadioCompanion#Variable_Controls ''Run-time adjustable'']</span>
; CPM Type
: The modulation type. Can be one of LREC, LRC, LSRC, TFM or GAUSSIAN. See gr_cpm::phase_response() for a detailed description.


; Param 1 (''R'')
; Modulation Index
: 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).
: Maximum phase change that can occur between two symbols, i.e., if you only send ones, the phase will increase by every  samples. Set this to 0.5 for Minimum Shift Keying variants.


; Param 2
; Samples per Symbol
: blah blah blah
: Self explanatory
 
; Pulse Duration (symbols)
: The length of the phase duration in symbols. For L=1, this yields full- response CPM symbols, for L > 1, partial-response.
 
; Phase Response Parameter (BT or beta)
: For LSRC, this is the rolloff factor. For Gaussian pulses, this is the 3 dB time-bandwidth product.


== Example Flowgraph ==
== Example Flowgraph ==
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; C++ files
; C++ files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-digital/lib/cpmmod_bc_impl.cc cpmmod_bc_impl.cc]


; Header files
; Header files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-digital/lib/cpmmod_bc_impl.h cpmmod_bc_impl.h]


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


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

Latest revision as of 08:59, 23 April 2024

Generic CPM modulator.

The input of this block are symbols from an M-ary alphabet +/-1, +/-3, ..., +/-(M-1). Usually, M = 2 and therefore, the valid inputs are +/-1. The modulator will silently accept any other inputs, though. The output is the phase-modulated signal.

Parameters

CPM Type
The modulation type. Can be one of LREC, LRC, LSRC, TFM or GAUSSIAN. See gr_cpm::phase_response() for a detailed description.
Modulation Index
Maximum phase change that can occur between two symbols, i.e., if you only send ones, the phase will increase by every samples. Set this to 0.5 for Minimum Shift Keying variants.
Samples per Symbol
Self explanatory
Pulse Duration (symbols)
The length of the phase duration in symbols. For L=1, this yields full- response CPM symbols, for L > 1, partial-response.
Phase Response Parameter (BT or beta)
For LSRC, this is the rolloff factor. For Gaussian pulses, this is the 3 dB time-bandwidth product.

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.

Source Files

C++ files
cpmmod_bc_impl.cc
Header files
cpmmod_bc_impl.h
Public header files
cpmmod_bc.h
Block definition
digital_cpmmod_bc.block.yml
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