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<h1>gr_simple_correlator.h</h1>  </div>
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<a href="gr__simple__correlator_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- c++ -*- */</span>
<a name="l00002"></a>00002 <span class="comment">/*</span>
<a name="l00003"></a>00003 <span class="comment"> * Copyright 2004 Free Software Foundation, Inc.</span>
<a name="l00004"></a>00004 <span class="comment"> * </span>
<a name="l00005"></a>00005 <span class="comment"> * This file is part of GNU Radio</span>
<a name="l00006"></a>00006 <span class="comment"> * </span>
<a name="l00007"></a>00007 <span class="comment"> * GNU Radio is free software; you can redistribute it and/or modify</span>
<a name="l00008"></a>00008 <span class="comment"> * it under the terms of the GNU General Public License as published by</span>
<a name="l00009"></a>00009 <span class="comment"> * the Free Software Foundation; either version 3, or (at your option)</span>
<a name="l00010"></a>00010 <span class="comment"> * any later version.</span>
<a name="l00011"></a>00011 <span class="comment"> * </span>
<a name="l00012"></a>00012 <span class="comment"> * GNU Radio is distributed in the hope that it will be useful,</span>
<a name="l00013"></a>00013 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00014"></a>00014 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
<a name="l00015"></a>00015 <span class="comment"> * GNU General Public License for more details.</span>
<a name="l00016"></a>00016 <span class="comment"> * </span>
<a name="l00017"></a>00017 <span class="comment"> * You should have received a copy of the GNU General Public License</span>
<a name="l00018"></a>00018 <span class="comment"> * along with GNU Radio; see the file COPYING.  If not, write to</span>
<a name="l00019"></a>00019 <span class="comment"> * the Free Software Foundation, Inc., 51 Franklin Street,</span>
<a name="l00020"></a>00020 <span class="comment"> * Boston, MA 02110-1301, USA.</span>
<a name="l00021"></a>00021 <span class="comment"> */</span>
<a name="l00022"></a>00022 
<a name="l00023"></a>00023 <span class="preprocessor">#ifndef INCLUDED_GR_SIMPLE_CORRELATOR_H</span>
<a name="l00024"></a>00024 <span class="preprocessor"></span><span class="preprocessor">#define INCLUDED_GR_SIMPLE_CORRELATOR_H</span>
<a name="l00025"></a>00025 <span class="preprocessor"></span>
<a name="l00026"></a>00026 <span class="preprocessor">#include &lt;gr_block.h&gt;</span>
<a name="l00027"></a>00027 <span class="preprocessor">#include &lt;assert.h&gt;</span>
<a name="l00028"></a>00028 
<a name="l00029"></a>00029 <span class="comment">//#define       DEBUG_SIMPLE_CORRELATOR</span>
<a name="l00030"></a>00030 
<a name="l00031"></a>00031 <span class="keyword">class </span><a class="code" href="classgr__simple__correlator.html" title="inverse of gr_simple_framer (more or less)">gr_simple_correlator</a>;
<a name="l00032"></a>00032 <span class="keyword">typedef</span> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">boost::shared_ptr&lt;gr_simple_correlator&gt;</a> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">gr_simple_correlator_sptr</a>;
<a name="l00033"></a>00033 
<a name="l00034"></a>00034 <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">gr_simple_correlator_sptr</a> <a class="code" href="gr__simple__correlator_8h.html#a1479b5c7f3c46cd3bb19506efecb871f">gr_make_simple_correlator</a> (<span class="keywordtype">int</span> payload_bytesize);
<a name="l00035"></a>00035 <span class="comment"></span>
<a name="l00036"></a>00036 <span class="comment">/*!</span>
<a name="l00037"></a>00037 <span class="comment"> * \brief inverse of gr_simple_framer (more or less)</span>
<a name="l00038"></a>00038 <span class="comment"> * \ingroup sync_blk</span>
<a name="l00039"></a>00039 <span class="comment"> */</span>
<a name="l00040"></a><a class="code" href="classgr__simple__correlator.html">00040</a> <span class="keyword">class </span><a class="code" href="classgr__simple__correlator.html" title="inverse of gr_simple_framer (more or less)">gr_simple_correlator</a> : <span class="keyword">public</span> <a class="code" href="classgr__block.html" title="The abstract base class for all &amp;#39;terminal&amp;#39; processing blocks.A signal processing flow is cons...">gr_block</a>
<a name="l00041"></a>00041 {
<a name="l00042"></a>00042   <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> OVERSAMPLE = 8;
<a name="l00043"></a>00043   <span class="keyword">enum</span> state_t { ST_LOOKING, ST_UNDER_THRESHOLD, ST_LOCKED };
<a name="l00044"></a>00044   
<a name="l00045"></a>00045   <span class="keywordtype">int</span>            d_payload_bytesize;
<a name="l00046"></a>00046   state_t        d_state;
<a name="l00047"></a>00047   <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>   d_osi;                         <span class="comment">// over sample index [0,OVERSAMPLE-1]</span>
<a name="l00048"></a>00048   <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>   d_transition_osi;              <span class="comment">// first index where Hamming dist &lt; thresh</span>
<a name="l00049"></a>00049   <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>   d_center_osi;                  <span class="comment">// center of bit</span>
<a name="l00050"></a>00050   <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> d_shift_reg[OVERSAMPLE];
<a name="l00051"></a>00051   <span class="keywordtype">int</span>            d_bblen;                       <span class="comment">// length of bitbuf</span>
<a name="l00052"></a>00052   <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *d_bitbuf;                      <span class="comment">// demodulated bits</span>
<a name="l00053"></a>00053   <span class="keywordtype">int</span>            d_bbi;                         <span class="comment">// bitbuf index</span>
<a name="l00054"></a>00054 
<a name="l00055"></a>00055   <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> AVG_PERIOD = 512;            <span class="comment">// must be power of 2 (for freq offset correction)</span>
<a name="l00056"></a>00056   <span class="keywordtype">int</span>   d_avbi;
<a name="l00057"></a>00057   <span class="keywordtype">float</span> d_avgbuf[AVG_PERIOD];
<a name="l00058"></a>00058   <span class="keywordtype">float</span> d_avg;
<a name="l00059"></a>00059   <span class="keywordtype">float</span> d_accum;
<a name="l00060"></a>00060 
<a name="l00061"></a>00061 <span class="preprocessor">#ifdef DEBUG_SIMPLE_CORRELATOR</span>
<a name="l00062"></a>00062 <span class="preprocessor"></span>  FILE          *d_debug_fp;                    <span class="comment">// binary log file</span>
<a name="l00063"></a>00063 <span class="preprocessor">#endif</span>
<a name="l00064"></a>00064 <span class="preprocessor"></span>
<a name="l00065"></a>00065   <span class="keyword">friend</span> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">gr_simple_correlator_sptr</a> <a class="code" href="classgr__simple__correlator.html#a1479b5c7f3c46cd3bb19506efecb871f">gr_make_simple_correlator</a> (<span class="keywordtype">int</span> payload_bytesize);
<a name="l00066"></a>00066   <a class="code" href="classgr__simple__correlator.html" title="inverse of gr_simple_framer (more or less)">gr_simple_correlator</a> (<span class="keywordtype">int</span> payload_bytesize);
<a name="l00067"></a>00067 
<a name="l00068"></a>00068 
<a name="l00069"></a>00069   <span class="keyword">inline</span> <span class="keywordtype">int</span> slice (<span class="keywordtype">float</span> x)
<a name="l00070"></a>00070   {
<a name="l00071"></a>00071     <span class="keywordflow">return</span> x &gt;= d_avg ? 1 : 0;
<a name="l00072"></a>00072   }
<a name="l00073"></a>00073 
<a name="l00074"></a>00074   <span class="keywordtype">void</span> update_avg(<span class="keywordtype">float</span> x);
<a name="l00075"></a>00075 
<a name="l00076"></a>00076   <span class="keywordtype">void</span> enter_locked ();
<a name="l00077"></a>00077   <span class="keywordtype">void</span> enter_under_threshold ();
<a name="l00078"></a>00078   <span class="keywordtype">void</span> enter_looking ();
<a name="l00079"></a>00079   
<a name="l00080"></a>00080   <span class="keyword">static</span> <span class="keywordtype">int</span> add_index (<span class="keywordtype">int</span> a, <span class="keywordtype">int</span> b)
<a name="l00081"></a>00081   {
<a name="l00082"></a>00082     <span class="keywordtype">int</span> t = a + b;
<a name="l00083"></a>00083     <span class="keywordflow">if</span> (t &gt;= OVERSAMPLE)
<a name="l00084"></a>00084       t -= OVERSAMPLE;
<a name="l00085"></a>00085     assert (t &gt;= 0 &amp;&amp; t &lt; OVERSAMPLE);
<a name="l00086"></a>00086     <span class="keywordflow">return</span> t;
<a name="l00087"></a>00087   }
<a name="l00088"></a>00088 
<a name="l00089"></a>00089   <span class="keyword">static</span> <span class="keywordtype">int</span> sub_index (<span class="keywordtype">int</span> a, <span class="keywordtype">int</span> b)
<a name="l00090"></a>00090   {
<a name="l00091"></a>00091     <span class="keywordtype">int</span> t = a - b;
<a name="l00092"></a>00092     <span class="keywordflow">if</span> (t &lt; 0)
<a name="l00093"></a>00093       t += OVERSAMPLE;
<a name="l00094"></a>00094     assert (t &gt;= 0 &amp;&amp; t &lt; OVERSAMPLE);
<a name="l00095"></a>00095     <span class="keywordflow">return</span> t;
<a name="l00096"></a>00096   }
<a name="l00097"></a>00097 
<a name="l00098"></a>00098   
<a name="l00099"></a>00099  <span class="keyword">public</span>:
<a name="l00100"></a>00100   <a class="code" href="classgr__simple__correlator.html#a0c867fa44fc7016d92f9797f81ef6363">~gr_simple_correlator</a> ();
<a name="l00101"></a>00101 
<a name="l00102"></a>00102   <span class="keywordtype">int</span> <a class="code" href="classgr__simple__correlator.html#ae1cdc6cc1f7ea276d7e3cdf025acc367" title="compute output items from input items">general_work</a> (<span class="keywordtype">int</span> noutput_items,
<a name="l00103"></a>00103                     <a class="code" href="classstd_1_1vector.html">gr_vector_int</a> &amp;ninput_items,
<a name="l00104"></a>00104                     <a class="code" href="classstd_1_1vector.html">gr_vector_const_void_star</a> &amp;input_items,
<a name="l00105"></a>00105                     <a class="code" href="classstd_1_1vector.html">gr_vector_void_star</a> &amp;output_items);
<a name="l00106"></a>00106 };
<a name="l00107"></a>00107 
<a name="l00108"></a>00108 
<a name="l00109"></a>00109 <span class="preprocessor">#endif </span><span class="comment">/* INCLUDED_GR_SIMPLE_CORRELATOR_H */</span>
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