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<h1>gr_probe_mpsk_snr_c.h</h1> </div>
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<a href="gr__probe__mpsk__snr__c_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"> * 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 <span class="preprocessor">#ifndef INCLUDED_GR_PROBE_MPSK_SNR_C_H</span>
<a name="l00023"></a>00023 <span class="preprocessor"></span><span class="preprocessor">#define INCLUDED_GR_PROBE_MPSK_SNR_C_H</span>
<a name="l00024"></a>00024 <span class="preprocessor"></span>
<a name="l00025"></a>00025 <span class="preprocessor">#include <gr_sync_block.h></span>
<a name="l00026"></a>00026
<a name="l00027"></a>00027 <span class="keyword">class </span><a class="code" href="classgr__probe__mpsk__snr__c.html">gr_probe_mpsk_snr_c</a>;
<a name="l00028"></a>00028 <span class="keyword">typedef</span> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">boost::shared_ptr<gr_probe_mpsk_snr_c></a> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">gr_probe_mpsk_snr_c_sptr</a>;
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">gr_probe_mpsk_snr_c_sptr</a>
<a name="l00031"></a>00031 <a class="code" href="gr__probe__mpsk__snr__c_8h.html#a5fb0a6f05a49e6033145d6751713ad9f">gr_make_probe_mpsk_snr_c</a>(<span class="keywordtype">double</span> alpha = 0.0001);
<a name="l00032"></a>00032 <span class="comment"></span>
<a name="l00033"></a>00033 <span class="comment">/*!</span>
<a name="l00034"></a>00034 <span class="comment"> * Compute the estimate SNR of an MPSK signal using the Squared Signal</span>
<a name="l00035"></a>00035 <span class="comment"> * to Noise Variance (SNV) technique.</span>
<a name="l00036"></a>00036 <span class="comment"> *</span>
<a name="l00037"></a>00037 <span class="comment"> * This technique assumes an AWGN channel.</span>
<a name="l00038"></a>00038 <span class="comment"> *</span>
<a name="l00039"></a>00039 <span class="comment"> * \param alpha Mean and variance smoothing filter constant</span>
<a name="l00040"></a>00040 <span class="comment"> * \ingroup sink_blk</span>
<a name="l00041"></a>00041 <span class="comment"> *</span>
<a name="l00042"></a>00042 <span class="comment"> * Compute the running average of the signal mean and noise variance.</span>
<a name="l00043"></a>00043 <span class="comment"> * The estimated signal mean, noise variance, and SNR are available</span>
<a name="l00044"></a>00044 <span class="comment"> * via accessors.</span>
<a name="l00045"></a>00045 <span class="comment"> *</span>
<a name="l00046"></a>00046 <span class="comment"> * This SNR estimator is inaccurate below about 7dB SNR.</span>
<a name="l00047"></a>00047 <span class="comment"> *</span>
<a name="l00048"></a>00048 <span class="comment"> */</span>
<a name="l00049"></a><a class="code" href="classgr__probe__mpsk__snr__c.html">00049</a> <span class="keyword">class </span><a class="code" href="classgr__probe__mpsk__snr__c.html">gr_probe_mpsk_snr_c</a> : <span class="keyword">public</span> <a class="code" href="classgr__sync__block.html" title="synchronous 1:1 input to output with historyOverride work to provide the signal processing implementa...">gr_sync_block</a>
<a name="l00050"></a>00050 {
<a name="l00051"></a>00051 <span class="keywordtype">double</span> d_alpha;
<a name="l00052"></a>00052 <span class="keywordtype">double</span> d_beta;
<a name="l00053"></a>00053 <span class="keywordtype">double</span> d_signal_mean;
<a name="l00054"></a>00054 <span class="keywordtype">double</span> d_noise_variance;
<a name="l00055"></a>00055
<a name="l00056"></a>00056 <span class="comment">// Factory function returning shared pointer of this class</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_probe_mpsk_snr_c_sptr</a>
<a name="l00058"></a>00058 <a class="code" href="classgr__probe__mpsk__snr__c.html#a86c0b05292da46db0b40e4218d034d26">gr_make_probe_mpsk_snr_c</a>(<span class="keywordtype">double</span> alpha);
<a name="l00059"></a>00059
<a name="l00060"></a>00060 <span class="comment">// Private constructor</span>
<a name="l00061"></a>00061 <a class="code" href="classgr__probe__mpsk__snr__c.html">gr_probe_mpsk_snr_c</a>(<span class="keywordtype">double</span> alpha);
<a name="l00062"></a>00062
<a name="l00063"></a>00063 <span class="keyword">public</span>:
<a name="l00064"></a>00064 <a class="code" href="classgr__probe__mpsk__snr__c.html#a257b81c1f5661c4a2e3db77e881363b7">~gr_probe_mpsk_snr_c</a>();
<a name="l00065"></a>00065
<a name="l00066"></a>00066 <span class="keywordtype">int</span> <a class="code" href="classgr__probe__mpsk__snr__c.html#a932b6d17f06f2e51bb24ef8d11d96094" 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="l00067"></a>00067 <a class="code" href="classstd_1_1vector.html">gr_vector_const_void_star</a> &input_items,
<a name="l00068"></a>00068 <a class="code" href="classstd_1_1vector.html">gr_vector_void_star</a> &output_items);
<a name="l00069"></a>00069
<a name="l00070"></a>00070 <span class="comment">// Return the estimated signal mean</span>
<a name="l00071"></a><a class="code" href="classgr__probe__mpsk__snr__c.html#ad1a5fdb5387eb6d27871d141ee72a73a">00071</a> <span class="keywordtype">double</span> <a class="code" href="classgr__probe__mpsk__snr__c.html#ad1a5fdb5387eb6d27871d141ee72a73a">signal_mean</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> d_signal_mean; }
<a name="l00072"></a>00072
<a name="l00073"></a>00073 <span class="comment">// Return the estimated noise variance</span>
<a name="l00074"></a><a class="code" href="classgr__probe__mpsk__snr__c.html#a8e6aa81e04d98ca22a0d6b0aedba89c4">00074</a> <span class="keywordtype">double</span> <a class="code" href="classgr__probe__mpsk__snr__c.html#a8e6aa81e04d98ca22a0d6b0aedba89c4">noise_variance</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> d_noise_variance; }
<a name="l00075"></a>00075
<a name="l00076"></a>00076 <span class="comment">// Return the estimated signal-to-noise ratio in decibels</span>
<a name="l00077"></a>00077 <span class="keywordtype">double</span> <a class="code" href="classgr__probe__mpsk__snr__c.html#a44a7b257bdb5b255e566a9d7173032ab">snr</a>() <span class="keyword">const</span>;
<a name="l00078"></a>00078
<a name="l00079"></a>00079 <span class="keywordtype">void</span> <a class="code" href="classgr__probe__mpsk__snr__c.html#a1d1a50fbbf5190c46b9c9d8cdd826fb2">set_alpha</a>(<span class="keywordtype">double</span> alpha);
<a name="l00080"></a>00080 };
<a name="l00081"></a>00081
<a name="l00082"></a>00082 <span class="preprocessor">#endif </span><span class="comment">/* INCLUDED_GR_PROBE_MPSK_SNR_C_H */</span>
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