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<h1>gr_ofdm_insert_preamble.h</h1> </div>
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<a href="gr__ofdm__insert__preamble_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 2007 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 along</span>
<a name="l00018"></a>00018 <span class="comment"> * with this program; if not, write to the Free Software Foundation, Inc.,</span>
<a name="l00019"></a>00019 <span class="comment"> * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.</span>
<a name="l00020"></a>00020 <span class="comment"> */</span>
<a name="l00021"></a>00021
<a name="l00022"></a>00022 <span class="preprocessor">#ifndef INCLUDED_GR_OFDM_INSERT_PREAMBLE_H</span>
<a name="l00023"></a>00023 <span class="preprocessor"></span><span class="preprocessor">#define INCLUDED_GR_OFDM_INSERT_PREAMBLE_H</span>
<a name="l00024"></a>00024 <span class="preprocessor"></span>
<a name="l00025"></a>00025 <span class="preprocessor">#include <gr_block.h></span>
<a name="l00026"></a>00026 <span class="preprocessor">#include <vector></span>
<a name="l00027"></a>00027
<a name="l00028"></a>00028 <span class="keyword">class </span><a class="code" href="classgr__ofdm__insert__preamble.html" title="insert &quot;pre-modulated&quot; preamble symbols before each payload.">gr_ofdm_insert_preamble</a>;
<a name="l00029"></a>00029 <span class="keyword">typedef</span> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">boost::shared_ptr<gr_ofdm_insert_preamble></a> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">gr_ofdm_insert_preamble_sptr</a>;
<a name="l00030"></a>00030
<a name="l00031"></a>00031 <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">gr_ofdm_insert_preamble_sptr</a>
<a name="l00032"></a>00032 <a class="code" href="gr__ofdm__insert__preamble_8h.html#a978133681920731a247d286fb078f796">gr_make_ofdm_insert_preamble</a>(<span class="keywordtype">int</span> fft_length,
<a name="l00033"></a>00033 <span class="keyword">const</span> <a class="code" href="classstd_1_1vector.html" title="vector documentation stub">std::vector</a><<a class="code" href="classstd_1_1vector.html">std::vector<gr_complex></a> > &preamble);
<a name="l00034"></a>00034 <span class="comment"></span>
<a name="l00035"></a>00035 <span class="comment">/*!</span>
<a name="l00036"></a>00036 <span class="comment"> * \brief insert "pre-modulated" preamble symbols before each payload.</span>
<a name="l00037"></a>00037 <span class="comment"> * \ingroup sync_blk</span>
<a name="l00038"></a>00038 <span class="comment"> * \ingroup ofdm_blk</span>
<a name="l00039"></a>00039 <span class="comment"> *</span>
<a name="l00040"></a>00040 <span class="comment"> * <pre></span>
<a name="l00041"></a>00041 <span class="comment"> * input 1: stream of vectors of gr_complex [fft_length]</span>
<a name="l00042"></a>00042 <span class="comment"> * These are the modulated symbols of the payload.</span>
<a name="l00043"></a>00043 <span class="comment"> *</span>
<a name="l00044"></a>00044 <span class="comment"> * input 2: stream of char. The LSB indicates whether the corresponding</span>
<a name="l00045"></a>00045 <span class="comment"> * symbol on input 1 is the first symbol of the payload or not.</span>
<a name="l00046"></a>00046 <span class="comment"> * It's a 1 if the corresponding symbol is the first symbol,</span>
<a name="l00047"></a>00047 <span class="comment"> * otherwise 0.</span>
<a name="l00048"></a>00048 <span class="comment"> *</span>
<a name="l00049"></a>00049 <span class="comment"> * N.B., this implies that there must be at least 1 symbol in the payload.</span>
<a name="l00050"></a>00050 <span class="comment"> *</span>
<a name="l00051"></a>00051 <span class="comment"> *</span>
<a name="l00052"></a>00052 <span class="comment"> * output 1: stream of vectors of gr_complex [fft_length]</span>
<a name="l00053"></a>00053 <span class="comment"> * These include the preamble symbols and the payload symbols.</span>
<a name="l00054"></a>00054 <span class="comment"> *</span>
<a name="l00055"></a>00055 <span class="comment"> * output 2: stream of char. The LSB indicates whether the corresponding</span>
<a name="l00056"></a>00056 <span class="comment"> * symbol on input 1 is the first symbol of a packet (i.e., the</span>
<a name="l00057"></a>00057 <span class="comment"> * first symbol of the preamble.) It's a 1 if the corresponding</span>
<a name="l00058"></a>00058 <span class="comment"> * symbol is the first symbol, otherwise 0.</span>
<a name="l00059"></a>00059 <span class="comment"> * </pre></span>
<a name="l00060"></a>00060 <span class="comment"> *</span>
<a name="l00061"></a>00061 <span class="comment"> * \param fft_length length of each symbol in samples.</span>
<a name="l00062"></a>00062 <span class="comment"> * \param preamble vector of symbols that represent the pre-modulated preamble.</span>
<a name="l00063"></a>00063 <span class="comment"> */</span>
<a name="l00064"></a>00064
<a name="l00065"></a><a class="code" href="classgr__ofdm__insert__preamble.html">00065</a> <span class="keyword">class </span><a class="code" href="classgr__ofdm__insert__preamble.html" title="insert &quot;pre-modulated&quot; preamble symbols before each payload.">gr_ofdm_insert_preamble</a> : <span class="keyword">public</span> <a class="code" href="classgr__block.html" title="The abstract base class for all &#39;terminal&#39; processing blocks.A signal processing flow is cons...">gr_block</a>
<a name="l00066"></a>00066 {
<a name="l00067"></a>00067 <span class="keyword">friend</span> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">gr_ofdm_insert_preamble_sptr</a>
<a name="l00068"></a>00068 <a class="code" href="classgr__ofdm__insert__preamble.html#a978133681920731a247d286fb078f796">gr_make_ofdm_insert_preamble</a>(<span class="keywordtype">int</span> fft_length,
<a name="l00069"></a>00069 <span class="keyword">const</span> <a class="code" href="classstd_1_1vector.html" title="vector documentation stub">std::vector</a><<a class="code" href="classstd_1_1vector.html">std::vector<gr_complex></a> > &preamble);
<a name="l00070"></a>00070
<a name="l00071"></a>00071 <span class="keyword">protected</span>:
<a name="l00072"></a>00072 <a class="code" href="classgr__ofdm__insert__preamble.html#ad114eb21de28a341f46001727d728fc5">gr_ofdm_insert_preamble</a>(<span class="keywordtype">int</span> fft_length,
<a name="l00073"></a>00073 <span class="keyword">const</span> <a class="code" href="classstd_1_1vector.html" title="vector documentation stub">std::vector</a><<a class="code" href="classstd_1_1vector.html">std::vector<gr_complex></a> > &preamble);
<a name="l00074"></a>00074
<a name="l00075"></a>00075 <span class="keyword">private</span>:
<a name="l00076"></a>00076 <span class="keyword">enum</span> state_t {
<a name="l00077"></a>00077 ST_IDLE,
<a name="l00078"></a>00078 ST_PREAMBLE,
<a name="l00079"></a>00079 ST_FIRST_PAYLOAD,
<a name="l00080"></a>00080 ST_PAYLOAD
<a name="l00081"></a>00081 };
<a name="l00082"></a>00082
<a name="l00083"></a>00083 <span class="keywordtype">int</span> d_fft_length;
<a name="l00084"></a>00084 <span class="keyword">const</span> <a class="code" href="classstd_1_1vector.html" title="vector documentation stub">std::vector<std::vector<gr_complex></a> > d_preamble;
<a name="l00085"></a>00085 state_t d_state;
<a name="l00086"></a>00086 <span class="keywordtype">int</span> d_nsymbols_output;
<a name="l00087"></a>00087 <span class="keywordtype">int</span> d_pending_flag;
<a name="l00088"></a>00088
<a name="l00089"></a>00089 <span class="keywordtype">void</span> enter_idle();
<a name="l00090"></a>00090 <span class="keywordtype">void</span> enter_preamble();
<a name="l00091"></a>00091 <span class="keywordtype">void</span> enter_first_payload();
<a name="l00092"></a>00092 <span class="keywordtype">void</span> enter_payload();
<a name="l00093"></a>00093
<a name="l00094"></a>00094
<a name="l00095"></a>00095 <span class="keyword">public</span>:
<a name="l00096"></a>00096 <a class="code" href="classgr__ofdm__insert__preamble.html#a59263b9b1c692b4f69810bcb94d4351d">~gr_ofdm_insert_preamble</a>();
<a name="l00097"></a>00097
<a name="l00098"></a>00098 <span class="keywordtype">int</span> <a class="code" href="classgr__ofdm__insert__preamble.html#ad79e088f4effd76866d25d6eeafb7ef8" title="compute output items from input items">general_work</a> (<span class="keywordtype">int</span> noutput_items,
<a name="l00099"></a>00099 <a class="code" href="classstd_1_1vector.html">gr_vector_int</a> &ninput_items,
<a name="l00100"></a>00100 <a class="code" href="classstd_1_1vector.html">gr_vector_const_void_star</a> &input_items,
<a name="l00101"></a>00101 <a class="code" href="classstd_1_1vector.html">gr_vector_void_star</a> &output_items);
<a name="l00102"></a>00102 };
<a name="l00103"></a>00103
<a name="l00104"></a>00104 <span class="preprocessor">#endif </span><span class="comment">/* INCLUDED_GR_OFDM_INSERT_PREAMBLE_H */</span>
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