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<span class="path" dir="ltr"><a href="index.html">FOSSEE_Communication_Systems_Toolbox</a> >> <a href="section_1f049b1e3111e3d1d538e7603f77f589.html">FOSSEE_Communication_Systems_Toolbox</a> > istrellis</span>
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<div class="refnamediv"><h1 class="refname">istrellis</h1>
<p class="refpurpose">This function checks if the given input is of trellis structure</p></div>
<div class="refsection"><h3 class="title">Description</h3>
<p class="para">[ISOK, STATUS] = ISTRELLIS(S) returns [T,''] if the given input is valid trellis structure. Otherwise ISOK is F and STATUS
indicates the reason for invalidity</p>
<p class="para">Fields in trellis structure are
numInputSymbols, (number of input symbols)
numOutputSymbols, (number of output symbols)
numStates, (number of states)
nextStates, (next state matrix)
outputs, (output matrix)</p>
<p class="para">Properties of the fields are as follows
numInputSymbols and numOutputSymbols should be a power of 2 (as data is represented in bits).
The 'nextStates' and 'outputs' fields are matrices of size 'numStates' x 'numInputSymbols' .
Each element in the 'nextStates' matrix and 'output' matrix is an integer value between zero and (numStates-1).
The (r,c) element of the 'nextStates' matrix and 'output' matrix,denotes the next state and output respectively when
the starting state is (r-1) and the input bits have decimal representation (c-1).</p>
<p class="para">To convert to decimal value, use the first input bit as the most significant bit (MSB).</p>
<p class="para"></p></div>
<div class="refsection"><h3 class="title">Examples</h3>
<div class="programlisting"><table border="0" width="100%"><tr><td width="98%"><pre class="scilabcode"><span class="scilabid">Valid</span> <span class="scilabid">trellis</span> <span class="scilabid">structure</span>
<span class="scilabid">trellis</span><span class="scilaboperator">.</span><span class="scilabfield">numInputSymbols</span> <span class="scilaboperator">=</span> <span class="scilabnumber">4</span><span class="scilabdefault">;</span>
<span class="scilabid">trellis</span><span class="scilaboperator">.</span><span class="scilabfield">numOutputSymbols</span> <span class="scilaboperator">=</span> <span class="scilabnumber">4</span><span class="scilabdefault">;</span>
<span class="scilabid">trellis</span><span class="scilaboperator">.</span><span class="scilabfield">numStates</span> <span class="scilaboperator">=</span> <span class="scilabnumber">3</span><span class="scilabdefault">;</span>
<span class="scilabid">trellis</span><span class="scilaboperator">.</span><span class="scilabfield">nextStates</span> <span class="scilaboperator">=</span> <span class="scilabopenclose">[</span><span class="scilabnumber">0</span> <span class="scilabnumber">1</span> <span class="scilabnumber">2</span> <span class="scilabnumber">1</span><span class="scilabdefault">;</span><span class="scilabnumber">0</span> <span class="scilabnumber">1</span> <span class="scilabnumber">2</span> <span class="scilabnumber">1</span><span class="scilabdefault">;</span> <span class="scilabnumber">0</span> <span class="scilabnumber">1</span> <span class="scilabnumber">2</span> <span class="scilabnumber">1</span><span class="scilabopenclose">]</span><span class="scilabdefault">;</span>
<span class="scilabid">trellis</span><span class="scilaboperator">.</span><span class="scilabfield">outputs</span> <span class="scilaboperator">=</span> <span class="scilabopenclose">[</span><span class="scilabnumber">0</span> <span class="scilabnumber">0</span> <span class="scilabnumber">1</span> <span class="scilabnumber">1</span><span class="scilabdefault">;</span><span class="scilabnumber">1</span> <span class="scilabnumber">1</span> <span class="scilabnumber">2</span> <span class="scilabnumber">1</span><span class="scilabdefault">;</span> <span class="scilabnumber">1</span> <span class="scilabnumber">0</span> <span class="scilabnumber">1</span> <span class="scilabnumber">1</span><span class="scilabopenclose">]</span><span class="scilabdefault">;</span>
<span class="scilabopenclose">[</span><span class="scilabid">isok</span><span class="scilabdefault">,</span><span class="scilabid">status</span><span class="scilabopenclose">]</span> <span class="scilaboperator">=</span> <span class="scilabid">istrellis</span><span class="scilabopenclose">(</span><span class="scilabid">trellis</span><span class="scilabopenclose">)</span>
<span class="scilabid">Inavlid</span> <span class="scilabid">trellis</span> <span class="scilabid">structure</span>
<span class="scilabid">trellis</span><span class="scilaboperator">.</span><span class="scilabfield">numInputSymbols</span> <span class="scilaboperator">=</span> <span class="scilabnumber">3</span><span class="scilabdefault">;</span>
<span class="scilabid">trellis</span><span class="scilaboperator">.</span><span class="scilabfield">numOutputSymbols</span> <span class="scilaboperator">=</span> <span class="scilabnumber">3</span><span class="scilabdefault">;</span>
<span class="scilabid">trellis</span><span class="scilaboperator">.</span><span class="scilabfield">numStates</span> <span class="scilaboperator">=</span> <span class="scilabnumber">3</span><span class="scilabdefault">;</span>
<span class="scilabid">trellis</span><span class="scilaboperator">.</span><span class="scilabfield">nextStates</span> <span class="scilaboperator">=</span> <span class="scilabopenclose">[</span><span class="scilabnumber">0</span> <span class="scilabnumber">1</span> <span class="scilabnumber">2</span> <span class="scilabdefault">;</span><span class="scilabnumber">0</span> <span class="scilabnumber">1</span> <span class="scilabnumber">2</span> <span class="scilabdefault">;</span> <span class="scilabnumber">0</span> <span class="scilabnumber">1</span> <span class="scilabnumber">2</span> <span class="scilabopenclose">]</span><span class="scilabdefault">;</span>
<span class="scilabid">trellis</span><span class="scilaboperator">.</span><span class="scilabfield">outputs</span> <span class="scilaboperator">=</span> <span class="scilabopenclose">[</span><span class="scilabnumber">0</span> <span class="scilabnumber">0</span> <span class="scilabnumber">1</span> <span class="scilabdefault">;</span><span class="scilabnumber">1</span> <span class="scilabnumber">1</span> <span class="scilabnumber">2</span> <span class="scilabdefault">;</span> <span class="scilabnumber">1</span> <span class="scilabnumber">0</span> <span class="scilabnumber">1</span> <span class="scilabopenclose">]</span><span class="scilabdefault">;</span>
<span class="scilabopenclose">[</span><span class="scilabid">isok</span><span class="scilabdefault">,</span><span class="scilabid">status</span><span class="scilabopenclose">]</span> <span class="scilaboperator">=</span> <span class="scilabid">istrellis</span><span class="scilabopenclose">(</span><span class="scilabid">trellis</span><span class="scilabopenclose">)</span></pre></td><td valign="top"><a href="scilab://scilab.execexample/"><img src="ScilabExecute.png" border="0"/></a></td><td valign="top"><a href="scilab://scilab.editexample/"><img src="ScilabEdit.png" border="0"/></a></td><td></td></tr></table></div></div>
<div class="refsection"><h3 class="title">Authors</h3>
<ul class="itemizedlist"><li class="member">Pola Lakshmi Priyanka, IIT Bombay</li></ul></div>
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