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<div class="title">Generating a correlated Rayleigh fading process </div> </div>
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<div class="textblock"><p>In this example we will generate a correlated Rayleigh fading process with a normaized Doppler frequency equal to 0.1. The normalized Doppler is defined as the multiplication of the maximum Doppler frequency by the sampling time (i.e. <img class="formulaInl" alt="$f_d = F_d T_s$" src="form_295.png"/>).</p>
<div class="fragment"><pre class="fragment"><span class="preprocessor">#include <<a class="code" href="itcomm_8h.html" title="Include file for the IT++ communications module.">itpp/itcomm.h</a>></span>
<span class="keyword">using namespace </span>itpp;
<span class="keywordtype">int</span> main()
{
<span class="comment">// Declare my_channel variable as an instance of the Rayleigh_Channel</span>
<span class="comment">// class</span>
<a class="code" href="classitpp_1_1TDL__Channel.html" title="Tapped Delay Line (TDL) channel model.">TDL_Channel</a> my_channel;
<span class="comment">// The normalized Doppler frequency is set to 0.1</span>
<span class="keywordtype">double</span> norm_dopp = 0.1;
my_channel.<a class="code" href="classitpp_1_1TDL__Channel.html#a8502b1dd0dfb0d7b438087739ab3b92d" title="Set normalized Doppler rate. A Correlated fading type will be used.">set_norm_doppler</a>(norm_dopp);
<span class="comment">// Generate nrof_samples of the fading process and store them in ch_coeffs</span>
<span class="comment">// matrix</span>
<span class="keywordtype">int</span> nrof_samples = 10000;
cmat ch_coeffs;
my_channel.<a class="code" href="classitpp_1_1TDL__Channel.html#ae8892db45e45f63c1fd228baf94b0222" title="Generate no_samples values of the channel.">generate</a>(nrof_samples, ch_coeffs);
<span class="comment">// Open an output file "rayleigh_test.it"</span>
<a class="code" href="classitpp_1_1it__file.html" title="The IT++ file format reading and writing class.">it_file</a> ff(<span class="stringliteral">"rayleigh_test.it"</span>);
<span class="comment">// Save channel coefficients to the output file</span>
ff << <a class="code" href="classitpp_1_1Name.html" title="Automatic naming when savingAn easy way to give a variable a name and optionally description when sav...">Name</a>(<span class="stringliteral">"ch_coeffs"</span>) << ch_coeffs;
<span class="comment">// Close the output file</span>
ff.<a class="code" href="classitpp_1_1it__file.html#a6e7217f36b35d6ea866e5fa8148009fa" title="Close the file.">close</a>();
<span class="comment">// Exit program</span>
<span class="keywordflow">return</span> 0;
}
</pre></div><p>You can use Matlab or Octave to examine the channel fading process that is stored int the output file <code>rayleigh_test.it</code>. Try the followigh code to view a part of the fading process:</p>
<div class="fragment"><pre class="fragment">itload(<span class="stringliteral">"rayleigh_test.it"</span>)
figure(1); clf;
semilogy(<a class="code" href="classitpp_1_1bin.html#aeef4249965bf7e458f1b509fad5d1486" title="absolute value of bin">abs</a>(ch_coeffs(1:200)))
</pre></div><p>Note: Make sure that the folder <code>$PREFIX/share/itpp</code> is included your Matlab/Octave path variable (<code>$PREFIX</code> is the IT++ installation prefix: <code>/usr/local</code> by default). </p>
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