Difference between revisions of "CMA Equalizer"

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[[Category:Block Docs]]
 
[[Category:Block Docs]]
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'''(DEPRECATED in 3.9 - Will be removed in a future release) - replaced by [[Linear_Equalizer]] and [[Adaptive_Algorithm]]'''
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Implements constant modulus adaptive filter on complex stream.
 
Implements constant modulus adaptive filter on complex stream.
  
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== 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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This flowgraph is taken from the [[Guided_Tutorial_PSK_Demodulation]] tutorial.
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[[File:stage4_grc.png|600px|]]
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[[File:stage4.png|600px|]]
  
 
== Source Files ==
 
== Source Files ==
  
 
; C++ files
 
; C++ files
: [https://github.com/gnuradio/gnuradio TODO]
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: [https://github.com/gnuradio/gnuradio/blob/master/gr-digital/lib/cma_equalizer_cc_impl.cc 1]
  
 
; Header files
 
; Header files
: [https://github.com/gnuradio/gnuradio TODO]
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: [https://github.com/gnuradio/gnuradio/blob/master/gr-digital/lib/cma_equalizer_cc_impl.h 2]
  
 
; Public header files
 
; Public header files
: [https://github.com/gnuradio/gnuradio TODO]
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: [https://github.com/gnuradio/gnuradio/blob/master/gr-digital/include/gnuradio/digital/cma_equalizer_cc.h 3]
  
 
; 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_cma_equalizer_cc.block.yml 4]

Latest revision as of 21:38, 26 November 2020

(DEPRECATED in 3.9 - Will be removed in a future release) - replaced by Linear_Equalizer and Adaptive_Algorithm

Implements constant modulus adaptive filter on complex stream.

The error value and tap update equations (for p=2) can be found in:

       D. Godard, "Self-Recovering Equalization and Carrier Tracking in Two-Dimensional Data Communication Systems", IEEE Transactions on Communications, Vol. 28, No. 11, pp. 1867 - 1875, 1980.

Parameters[edit]

(R): Run-time adjustable

Num. taps 
Number of taps in the equalizer (channel size)
Modulus (R)
Modulus of the modulated signals
Gain (R)
Gain of the update loop
Samples per symbol 
Number of samples per symbol of the input signal

Example Flowgraph[edit]

This flowgraph is taken from the Guided_Tutorial_PSK_Demodulation tutorial.

Stage4 grc.png

Stage4.png

Source Files[edit]

C++ files
1
Header files
2
Public header files
3
Block definition
4