<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <title>GNU Radio 3.3.0 C++ API: gr_ofdm_frame_acquisition.h File Reference</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <link href="doxygen.css" rel="stylesheet" type="text/css"/> </head> <body> <!-- Generated by Doxygen 1.6.3 --> <div class="contents"> <h1>gr_ofdm_frame_acquisition.h File Reference</h1><code>#include <<a class="el" href="gr__block_8h_source.html">gr_block.h</a>></code><br/> <code>#include <vector></code><br/> <div class="dynheader"> Include dependency graph for gr_ofdm_frame_acquisition.h:</div> <div class="dynsection"> <div class="center"><img src="gr__ofdm__frame__acquisition_8h__incl.png" border="0" usemap="#gr__ofdm__frame__acquisition_8h_map" alt=""/></div> <map name="gr__ofdm__frame__acquisition_8h_map" id="gr__ofdm__frame__acquisition_8h"> <area shape="rect" id="node3" href="gr__block_8h.html" title="gr_block.h" alt="" coords="739,83,821,112"/><area shape="rect" id="node5" href="gr__basic__block_8h.html" title="gr_basic_block.h" alt="" coords="605,160,725,189"/><area shape="rect" id="node7" href="gr__runtime__types_8h.html" title="gr_runtime_types.h" alt="" coords="896,237,1029,267"/><area shape="rect" id="node21" href="gr__sptr__magic_8h_source.html" title="gr_sptr_magic.h" alt="" coords="647,315,761,344"/><area shape="rect" id="node26" href="gr__msg__accepter_8h.html" title="gr_msg_accepter.h" alt="" coords="437,237,571,267"/><area shape="rect" id="node9" href="gr__types_8h.html" title="gr_types.h" alt="" coords="921,315,1004,344"/><area shape="rect" id="node17" href="gr__complex_8h.html" title="gr_complex.h" alt="" coords="771,392,869,421"/><area shape="rect" id="node28" href="msg__accepter_8h.html" title="gruel/msg_accepter.h" alt="" coords="467,315,613,344"/><area shape="rect" id="node30" href="pmt_8h.html" title="gruel/pmt.h" alt="" coords="387,392,472,421"/><area shape="rect" id="node46" href="pmt__sugar_8h.html" title="gruel/pmt_sugar.h" alt="" coords="483,469,608,499"/></map> </div> <p><a href="gr__ofdm__frame__acquisition_8h_source.html">Go to the source code of this file.</a></p> <table border="0" cellpadding="0" cellspacing="0"> <tr><td colspan="2"><h2>Classes</h2></td></tr> <tr><td class="memItemLeft" align="right" valign="top">class </td><td class="memItemRight" valign="bottom"><a class="el" href="classgr__ofdm__frame__acquisition.html">gr_ofdm_frame_acquisition</a></td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">take a vector of complex constellation points in from an FFT and performs a correlation and equalization.This block takes the output of an FFT of a received OFDM symbol and finds the start of a frame based on two known symbols. It also looks at the surrounding bins in the FFT output for the correlation in case there is a large frequency shift in the data. This block assumes that the fine frequency shift has already been corrected and that the samples fall in the middle of one FFT bin. <a href="classgr__ofdm__frame__acquisition.html#_details">More...</a><br/></td></tr> <tr><td colspan="2"><h2>Functions</h2></td></tr> <tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classboost_1_1shared__ptr.html">gr_ofdm_frame_acquisition_sptr</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="gr__ofdm__frame__acquisition_8h.html#a49a9bd0c41145f54df26ceadef2b0431">gr_make_ofdm_frame_acquisition</a> (unsigned int occupied_carriers, unsigned int fft_length, unsigned int cplen, const <a class="el" href="classstd_1_1vector.html">std::vector</a>< <a class="el" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> > &known_symbol, unsigned int max_fft_shift_len=10)</td></tr> </table> <hr/><h2>Function Documentation</h2> <a class="anchor" id="a49a9bd0c41145f54df26ceadef2b0431"></a><!-- doxytag: member="gr_ofdm_frame_acquisition.h::gr_make_ofdm_frame_acquisition" ref="a49a9bd0c41145f54df26ceadef2b0431" args="(unsigned int occupied_carriers, unsigned int fft_length, unsigned int cplen, const std::vector< gr_complex > &known_symbol, unsigned int max_fft_shift_len=10)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname"><a class="el" href="classboost_1_1shared__ptr.html">gr_ofdm_frame_acquisition_sptr</a> gr_make_ofdm_frame_acquisition </td> <td>(</td> <td class="paramtype">unsigned int </td> <td class="paramname"> <em>occupied_carriers</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">unsigned int </td> <td class="paramname"> <em>fft_length</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">unsigned int </td> <td class="paramname"> <em>cplen</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">const <a class="el" href="classstd_1_1vector.html">std::vector</a>< <a class="el" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> > & </td> <td class="paramname"> <em>known_symbol</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">unsigned int </td> <td class="paramname"> <em>max_fft_shift_len</em> = <code>10</code></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td></td> </tr> </table> </div> <div class="memdoc"> <dl><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>occupied_carriers</em> </td><td>The number of subcarriers with data in the received symbol </td></tr> <tr><td valign="top"></td><td valign="top"><em>fft_length</em> </td><td>The size of the FFT vector (occupied_carriers + unused carriers) </td></tr> <tr><td valign="top"></td><td valign="top"><em>cplen</em> </td><td>The length of the cycle prefix </td></tr> <tr><td valign="top"></td><td valign="top"><em>known_symbol</em> </td><td>A vector of complex numbers representing a known symbol at the start of a frame (usually a BPSK PN sequence) </td></tr> <tr><td valign="top"></td><td valign="top"><em>max_fft_shift_len</em> </td><td>Set's the maximum distance you can look between bins for correlation </td></tr> </table> </dd> </dl> </div> </div> </div> <hr class="footer"/><address style="text-align: right;"><small>Generated on Wed Dec 29 19:51:47 2010 for GNU Radio 3.3.0 C++ API by <a href="http://www.doxygen.org/index.html"> <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.3 </small></address> </body> </html>