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The Bercurve Sink block creates a plot of Bit Error Rate versus Signal to Noise ratio (ES/No). The block calculates the BER itself internally by comparing the original data (pre-distortion) from input <code>i</code> with the post-distortion, post-decoding data on input <code>i+1</code>. So <code>(input_items[i] XOR input_items[i+1])</code> is the BER to plot for that particular Es/No point. Each curve is made with 8 data points, thus requiring 16 input ports.
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[[Category:Block Docs]]
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[[Category:Stub Docs]]
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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.
  
The Bercurve Sink can operate in two modes:
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As this is a basic template, it's also in the [[:Category:Stub_Docs|"Stub Docs category"]]. Please improve it.
* Separate input ports
 
* Bus input ports
 
 
== Separate input ports ==
 
 
 
Using gnuradio-companion (GRC), the default configuration of a new Bercurve Sink is with 16 separate input ports <b>per curve</b>. The ports are paired: (0, 1), (2, 3), ... (14,15). Each input pair produces one point on the corresponding curve.
 
 
 
== Bus input ports ==
 
 
 
Instead of having so many separate input ports (16 times the number of curves), the sink can operate in the "Bus" mode, where all the data for one curve is grouped into one "bus". To activate this mode, right click on the Bercurve Sink block, select "More", then select "Toggle Sink Bus". This mode matches the output of a "BER Curve Gen." block. See the example flowgraph below.  
 
  
 
== Parameters ==
 
== Parameters ==
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(''R''): <span class="plainlinks">[https://wiki.gnuradio.org/index.php/GNURadioCompanion#Variable_Controls ''Run-time adjustable'']</span>
  
; esno
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; Param 1 (''R'')
: Vector of SNR (ES/No) values to plot for. Typical value is <code>numpy.arange (0, 8, .5)</code>
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: 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).
 
 
; Min. BER Errs.
 
:
 
 
 
; BER Limit
 
:
 
 
 
; Num Curves
 
: Number of curves to draw on the same graph
 
 
 
; Curve Names
 
:
 
 
 
; Y min
 
:
 
 
 
; Y max
 
:
 
 
 
; Update Period
 
:
 
 
 
; GUI Hint
 
: See [[GUI Hint]] for info about how to organize multiple QT GUIs
 
 
 
; Line X Label
 
:
 
 
 
; Line X Width
 
:
 
 
 
; Line X Color
 
:
 
 
 
; Line X Style
 
:
 
  
; Line X Marker
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; Param 2
:
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: blah blah blah
 
 
; Line X Alpha
 
:  
 
  
 
== Example Flowgraph ==
 
== Example Flowgraph ==
  
This flowgraph is derived from https://github.com/gnuradio/gnuradio/blob/master/gr-fec/examples/ber_curve_gen.grc
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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.
 
 
[[File:Ber_curve_gen_fg.png|800px]]
 
  
 
== Source Files ==
 
== Source Files ==
  
 
; C++ files
 
; C++ files
: [https://github.com/gnuradio/gnuradio/blob/master/gr-qtgui/lib/ber_sink_b_impl.cc]
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: [https://github.com/gnuradio/gnuradio TODO]
  
 
; Header files
 
; Header files
: [https://github.com/gnuradio/gnuradio/blob/master/gr-qtgui/lib/ber_sink_b_impl.h]
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: [https://github.com/gnuradio/gnuradio TODO]
  
 
; Public header files
 
; Public header files
: [https://github.com/gnuradio/gnuradio/blob/master/gr-qtgui/include/gnuradio/qtgui/ber_sink_b.h]
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: [https://github.com/gnuradio/gnuradio TODO]
  
 
; Block definition
 
; Block definition
: [https://github.com/gnuradio/gnuradio/blob/master/gr-qtgui/grc/qtgui_ber_sink_b.block.yml]
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: [https://github.com/gnuradio/gnuradio TODO]
 
 
[[Category:Block Docs]]
 

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