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<h1>gr_decode_ccsds_27_fb.h</h1> </div>
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<a href="gr__decode__ccsds__27__fb_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 2008 Free Software Foundation, Inc.</span>
<a name="l00004"></a>00004 <span class="comment"> * </span>
<a name="l00005"></a>00005 <span class="comment"> * GNU Radio is free software; you can redistribute it and/or modify</span>
<a name="l00006"></a>00006 <span class="comment"> * it under the terms of the GNU General Public License as published by</span>
<a name="l00007"></a>00007 <span class="comment"> * the Free Software Foundation; either version 3, or (at your option)</span>
<a name="l00008"></a>00008 <span class="comment"> * any later version.</span>
<a name="l00009"></a>00009 <span class="comment"> * </span>
<a name="l00010"></a>00010 <span class="comment"> * GNU Radio is distributed in the hope that it will be useful,</span>
<a name="l00011"></a>00011 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00012"></a>00012 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<a name="l00013"></a>00013 <span class="comment"> * GNU General Public License for more details.</span>
<a name="l00014"></a>00014 <span class="comment"> * </span>
<a name="l00015"></a>00015 <span class="comment"> * You should have received a copy of the GNU General Public License</span>
<a name="l00016"></a>00016 <span class="comment"> * along with GNU Radio; see the file COPYING. If not, write to</span>
<a name="l00017"></a>00017 <span class="comment"> * the Free Software Foundation, Inc., 51 Franklin Street,</span>
<a name="l00018"></a>00018 <span class="comment"> * Boston, MA 02110-1301, USA.</span>
<a name="l00019"></a>00019 <span class="comment"> */</span>
<a name="l00020"></a>00020 <span class="preprocessor">#ifndef INCLUDED_GR_DECODE_CCSDS_27_FB_H</span>
<a name="l00021"></a>00021 <span class="preprocessor"></span><span class="preprocessor">#define INCLUDED_GR_DECODE_CCSDS_27_FB_H</span>
<a name="l00022"></a>00022 <span class="preprocessor"></span>
<a name="l00023"></a>00023 <span class="preprocessor">#include <gr_sync_decimator.h></span>
<a name="l00024"></a>00024
<a name="l00025"></a>00025 <span class="keyword">extern</span> <span class="stringliteral">"C"</span> {
<a name="l00026"></a>00026 <span class="preprocessor">#include "<a class="code" href="viterbi_8h.html">../viterbi/viterbi.h</a>"</span>
<a name="l00027"></a>00027 }
<a name="l00028"></a>00028
<a name="l00029"></a>00029 <span class="keyword">class </span><a class="code" href="classgr__decode__ccsds__27__fb.html" title="A rate 1/2, k=7 convolutional decoder for the CCSDS standardThis block performs soft-decision convolu...">gr_decode_ccsds_27_fb</a>;
<a name="l00030"></a>00030
<a name="l00031"></a>00031 <span class="keyword">typedef</span> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">boost::shared_ptr<gr_decode_ccsds_27_fb></a> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">gr_decode_ccsds_27_fb_sptr</a>;
<a name="l00032"></a>00032
<a name="l00033"></a>00033 <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">gr_decode_ccsds_27_fb_sptr</a> <a class="code" href="gr__decode__ccsds__27__fb_8h.html#a9aa133569967608121cc77aa5f0bbcbd">gr_make_decode_ccsds_27_fb</a>();
<a name="l00034"></a>00034 <span class="comment"></span>
<a name="l00035"></a>00035 <span class="comment">/*! \brief A rate 1/2, k=7 convolutional decoder for the CCSDS standard</span>
<a name="l00036"></a>00036 <span class="comment"> * \ingroup ecc</span>
<a name="l00037"></a>00037 <span class="comment"> * </span>
<a name="l00038"></a>00038 <span class="comment"> * This block performs soft-decision convolutional decoding using the Viterbi</span>
<a name="l00039"></a>00039 <span class="comment"> * algorithm.</span>
<a name="l00040"></a>00040 <span class="comment"> * </span>
<a name="l00041"></a>00041 <span class="comment"> * The input is a stream of (possibly noise corrupted) floating point values </span>
<a name="l00042"></a>00042 <span class="comment"> * nominally spanning [-1.0, 1.0], representing the encoded channel symbols </span>
<a name="l00043"></a>00043 <span class="comment"> * 0 (-1.0) and 1 (1.0), with erased symbols at 0.0.</span>
<a name="l00044"></a>00044 <span class="comment"> *</span>
<a name="l00045"></a>00045 <span class="comment"> * The output is MSB first packed bytes of decoded values.</span>
<a name="l00046"></a>00046 <span class="comment"> *</span>
<a name="l00047"></a>00047 <span class="comment"> * As a rate 1/2 code, there will be one output byte for every 16 input symbols.</span>
<a name="l00048"></a>00048 <span class="comment"> *</span>
<a name="l00049"></a>00049 <span class="comment"> * This block is designed for continuous data streaming, not packetized data.</span>
<a name="l00050"></a>00050 <span class="comment"> * The first 32 bits out will be zeroes, with the output delayed four bytes</span>
<a name="l00051"></a>00051 <span class="comment"> * from the corresponding inputs.</span>
<a name="l00052"></a>00052 <span class="comment"> */</span>
<a name="l00053"></a>00053
<a name="l00054"></a><a class="code" href="classgr__decode__ccsds__27__fb.html">00054</a> <span class="keyword">class </span><a class="code" href="classgr__decode__ccsds__27__fb.html" title="A rate 1/2, k=7 convolutional decoder for the CCSDS standardThis block performs soft-decision convolu...">gr_decode_ccsds_27_fb</a> : <span class="keyword">public</span> <a class="code" href="classgr__sync__decimator.html" title="synchronous N:1 input to output with historyOverride work to provide the signal processing implementa...">gr_sync_decimator</a>
<a name="l00055"></a>00055 {
<a name="l00056"></a>00056 <span class="keyword">private</span>:
<a name="l00057"></a>00057 <span class="keyword">friend</span> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">gr_decode_ccsds_27_fb_sptr</a> <a class="code" href="classgr__decode__ccsds__27__fb.html#a9aa133569967608121cc77aa5f0bbcbd">gr_make_decode_ccsds_27_fb</a>();
<a name="l00058"></a>00058
<a name="l00059"></a>00059 <a class="code" href="classgr__decode__ccsds__27__fb.html" title="A rate 1/2, k=7 convolutional decoder for the CCSDS standardThis block performs soft-decision convolu...">gr_decode_ccsds_27_fb</a>();
<a name="l00060"></a>00060
<a name="l00061"></a>00061 <span class="comment">// Viterbi state</span>
<a name="l00062"></a>00062 <span class="keywordtype">int</span> d_mettab[2][256];
<a name="l00063"></a>00063 <span class="keyword">struct </span><a class="code" href="structviterbi__state.html">viterbi_state</a> d_state0[64];
<a name="l00064"></a>00064 <span class="keyword">struct </span><a class="code" href="structviterbi__state.html">viterbi_state</a> d_state1[64];
<a name="l00065"></a>00065 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> d_viterbi_in[16];
<a name="l00066"></a>00066
<a name="l00067"></a>00067 <span class="keywordtype">int</span> d_count;
<a name="l00068"></a>00068
<a name="l00069"></a>00069 <span class="keyword">public</span>:
<a name="l00070"></a>00070 <a class="code" href="classgr__decode__ccsds__27__fb.html#ae325913365d75520e8b9ccddb1832522">~gr_decode_ccsds_27_fb</a>();
<a name="l00071"></a>00071
<a name="l00072"></a>00072 <span class="keywordtype">int</span> <a class="code" href="classgr__decode__ccsds__27__fb.html#a913481b6b9bfbf8a97ba5f02deddd31d" title="just like gr_block::general_work, only this arranges to call consume_each for you">work</a> (<span class="keywordtype">int</span> noutput_items,
<a name="l00073"></a>00073 <a class="code" href="classstd_1_1vector.html">gr_vector_const_void_star</a> &input_items,
<a name="l00074"></a>00074 <a class="code" href="classstd_1_1vector.html">gr_vector_void_star</a> &output_items);
<a name="l00075"></a>00075 };
<a name="l00076"></a>00076
<a name="l00077"></a>00077 <span class="preprocessor">#endif </span><span class="comment">/* INCLUDED_GR_DECODE_CCSDS_27_FB_H */</span>
</pre></div></div>
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