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<div class="title">Interleaving and de-interleaving of data </div>  </div>
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<div class="textblock"><p>This example shows how to use one of the interleaving classes.</p>
<div class="fragment"><pre class="fragment"><span class="preprocessor">#include &lt;<a class="code" href="itcomm_8h.html" title="Include file for the IT++ communications module.">itpp/itcomm.h</a>&gt;</span>

<span class="keyword">using namespace </span>itpp;

<span class="comment">//These lines are needed for use of cout and endl</span>
<span class="keyword">using</span> std::cout;
<span class="keyword">using</span> std::endl;

<span class="keywordtype">int</span> main()
{
  <span class="comment">//Declare scalars and vectors:</span>
  <span class="keywordtype">int</span> rows, cols;
  ivec input, output, deinterleaved;

  <span class="comment">//Declare the interleaver. The interleaver classes are templated, and therefore we must specify</span>
  <span class="comment">//the type of the data elements. In this example we are using integers:</span>
  <a class="code" href="classitpp_1_1Block__Interleaver.html" title="Block Interleaver Class.">Block_Interleaver&lt;int&gt;</a> my_interleaver;

  <span class="comment">//Initialize the interleaver class. Note that this can be done already in the declaration by writing</span>
  <span class="comment">//Block_Interleaver&lt;int&gt; my_interleaver(rows,cols);</span>
  rows = 4;
  cols = 5;
  my_interleaver.<a class="code" href="classitpp_1_1Block__Interleaver.html#ac52dd1b18110528bba6ce67937d14024" title="Set the number of rows for block interleaving.">set_rows</a>(rows);
  my_interleaver.<a class="code" href="classitpp_1_1Block__Interleaver.html#a7c933fa3a6bec600b3eb0fbfd62ad786" title="Set the number of columns for block interleaving.">set_cols</a>(cols);

  <span class="comment">//Define the input to the interleaver:</span>
  input = <span class="stringliteral">&quot;1:20&quot;</span>;

  <span class="comment">//Do the interleaving:</span>
  output = my_interleaver.<a class="code" href="classitpp_1_1Block__Interleaver.html#a250fc156ccb4545850f0d9e72495bec3" title="Function for block interleaving. May add some zeros.">interleave</a>(input);

  <span class="comment">//Do the de-interleaving:</span>
  deinterleaved = my_interleaver.<a class="code" href="classitpp_1_1Block__Interleaver.html#a0c82b6bed55a14a3f7b8580668ab4bc5" title="Function for block deinterleaving. Removes additional zeros if keepzeros = 0.">deinterleave</a>(output);

  <span class="comment">//Print the results:</span>
  cout &lt;&lt; <span class="stringliteral">&quot;input = &quot;</span> &lt;&lt; input &lt;&lt; endl;
  cout &lt;&lt; <span class="stringliteral">&quot;output = &quot;</span> &lt;&lt; output &lt;&lt; endl;
  cout &lt;&lt; <span class="stringliteral">&quot;deinterleaved = &quot;</span> &lt;&lt; deinterleaved &lt;&lt; endl;

  <span class="comment">//Exit program:</span>
  <span class="keywordflow">return</span> 0;

}
</pre></div><p>When you run this program, the output will look like this:</p>
<div class="fragment"><pre class="fragment">input = [1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20]
output = [1 5 9 13 17 2 6 10 14 18 3 7 11 15 19 4 8 12 16 20]
deinterleaved = [1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20]
</pre></div> </div></div>
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