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<?xml version="1.0"?>
<block>
<name>LDPC Decoder Definition</name>
<key>variable_ldpc_decoder_def</key>
<import>from gnuradio import fec</import>
<var_make>
#if int($ndim())==0 #
self.$(id) = $(id) = fec.ldpc_decoder.make($file, $sigma, $max_iter); #slurp
#else if int($ndim())==1 #
self.$(id) = $(id) = map( (lambda a: fec.ldpc_decoder.make($file, $sigma, $max_iter)), range(0,$dim1) ); #slurp
#else
self.$(id) = $(id) = map( (lambda b: map( ( lambda a: fec.ldpc_decoder.make($file, $sigma, $max_iter)), range(0,$dim2) ) ), range(0,$dim1)); #slurp
#end if</var_make>
<make></make>
<!-- This definition below is wierd, it seems required for the GRC to be happy, im confused -->
<param>
<name>Ignore Me</name>
<key>value</key>
<value>"ok"</value>
<type>raw</type>
<hide>all</hide>
</param>
<param>
<name>Parallelism</name>
<key>ndim</key>
<value>0</value>
<type>enum</type>
<option>
<name>0</name>
<key>0</key>
</option>
<option>
<name>1</name>
<key>1</key>
</option>
<option>
<name>2</name>
<key>2</key>
</option>
</param>
<param>
<name>Dimension 1</name>
<key>dim1</key>
<value>4</value>
<type>int</type>
<hide>#if (int($ndim()) >= 1) then 'none' else 'all' #</hide>
</param>
<param>
<name>Dimension 2</name>
<key>dim2</key>
<value>4</value>
<type>int</type>
<hide>#if (int($ndim()) >= 2) then 'none' else 'all' #</hide>
</param>
<param>
<name>AList File</name>
<key>file</key>
<type>file_open</type>
</param>
<param>
<name>Sigma</name>
<key>sigma</key>
<value>0.5</value>
<type>float</type>
</param>
<param>
<name>Max Iterations</name>
<key>max_iter</key>
<value>50</value>
<type>int</type>
</param>
<doc>
This is a soft-decision decoder that uses belief propagation (also known as message passing) that is described at:
www.cs.toronto.edu/~radford/ftp/LDPC-2012-02-11/decoding.html
Designed for a memoryless AWGN channel, it assumes a noise variance of the value specified for sigma.
</doc>
</block>
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