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<h1>gr_mpsk_receiver_cc.h</h1><a href="gr__mpsk__receiver__cc_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 2004,2007 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</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_MPSK_RECEIVER_CC_H</span>
<a name="l00024"></a>00024 <span class="preprocessor"></span><span class="preprocessor">#define INCLUDED_GR_MPSK_RECEIVER_CC_H</span>
<a name="l00025"></a>00025 <span class="preprocessor"></span>
<a name="l00026"></a>00026 <span class="preprocessor">#include <<a class="code" href="gr__block_8h.html">gr_block.h</a>></span>
<a name="l00027"></a>00027 <span class="preprocessor">#include <<a class="code" href="gr__complex_8h.html">gr_complex.h</a>></span>
<a name="l00028"></a>00028 <span class="preprocessor">#include <fstream></span>
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="keyword">class </span><a class="code" href="classgri__mmse__fir__interpolator__cc.html" title="Compute intermediate samples between signal samples x(k*Ts)This implements a Mininum...">gri_mmse_fir_interpolator_cc</a>;
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="keyword">class </span><a class="code" href="classgr__mpsk__receiver__cc.html" title="This block takes care of receiving M-PSK modulated signals through phase, frequency...">gr_mpsk_receiver_cc</a>;
<a name="l00033"></a>00033 <span class="keyword">typedef</span> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">boost::shared_ptr<gr_mpsk_receiver_cc></a> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">gr_mpsk_receiver_cc_sptr</a>;
<a name="l00034"></a>00034
<a name="l00035"></a>00035 <span class="comment">// public constructor</span>
<a name="l00036"></a>00036 <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">gr_mpsk_receiver_cc_sptr</a>
<a name="l00037"></a>00037 <a class="code" href="gr__mpsk__receiver__cc_8h.html#a302053914cb025ad3fe4eb65b9f30bf2">gr_make_mpsk_receiver_cc</a> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> M, <span class="keywordtype">float</span> theta,
<a name="l00038"></a>00038 <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a193dbf8c468eb40b901ea15d17f23837" title="(CL) Returns the value for alpha (the phase gain term)">alpha</a>, <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a2854f1584948a1ae9985c6466dc042bc" title="(CL) Returns the value of beta (the frequency gain term)">beta</a>,
<a name="l00039"></a>00039 <span class="keywordtype">float</span> fmin, <span class="keywordtype">float</span> fmax,
<a name="l00040"></a>00040 <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a5a8d656fed27db70a3b90bf8e5739c58" title="(M&amp;M) Returns current value of mu">mu</a>, <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#ab35c94b9fa4206794dede51d2174f26f" title="(M&amp;M) Returns mu gain factor">gain_mu</a>,
<a name="l00041"></a>00041 <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a871efa619b3de0882272c5c8def64250" title="(M&amp;M) Returns current value of omega">omega</a>, <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a3bf2b3d7f8aa2f03b908ec1dd361ecb8" title="(M&amp;M) Returns omega gain factor">gain_omega</a>, <span class="keywordtype">float</span> omega_rel);
<a name="l00042"></a>00042 <span class="comment"></span>
<a name="l00043"></a>00043 <span class="comment">/*!</span>
<a name="l00044"></a>00044 <span class="comment"> * \brief This block takes care of receiving M-PSK modulated signals through phase, frequency, and symbol</span>
<a name="l00045"></a>00045 <span class="comment"> * synchronization. </span>
<a name="l00046"></a>00046 <span class="comment"> * \ingroup sync_blk</span>
<a name="l00047"></a>00047 <span class="comment"> * \ingroup demod_blk</span>
<a name="l00048"></a>00048 <span class="comment"> *</span>
<a name="l00049"></a>00049 <span class="comment"> * This block takes care of receiving M-PSK modulated signals through phase, frequency, and symbol</span>
<a name="l00050"></a>00050 <span class="comment"> * synchronization. It performs carrier frequency and phase locking as well as symbol timing recovery. </span>
<a name="l00051"></a>00051 <span class="comment"> * It works with (D)BPSK, (D)QPSK, and (D)8PSK as tested currently. It should also work for OQPSK and </span>
<a name="l00052"></a>00052 <span class="comment"> * PI/4 DQPSK.</span>
<a name="l00053"></a>00053 <span class="comment"> *</span>
<a name="l00054"></a>00054 <span class="comment"> * The phase and frequency synchronization are based on a Costas loop that finds the error of the incoming</span>
<a name="l00055"></a>00055 <span class="comment"> * signal point compared to its nearest constellation point. The frequency and phase of the NCO are </span>
<a name="l00056"></a>00056 <span class="comment"> * updated according to this error. There are optimized phase error detectors for BPSK and QPSK, but 8PSK</span>
<a name="l00057"></a>00057 <span class="comment"> * is done using a brute-force computation of the constellation points to find the minimum.</span>
<a name="l00058"></a>00058 <span class="comment"> *</span>
<a name="l00059"></a>00059 <span class="comment"> * The symbol synchronization is done using a modified Mueller and Muller circuit from the paper:</span>
<a name="l00060"></a>00060 <span class="comment"> * </span>
<a name="l00061"></a>00061 <span class="comment"> * G. R. Danesfahani, T.G. Jeans, "Optimisation of modified Mueller and Muller </span>
<a name="l00062"></a>00062 <span class="comment"> * algorithm," Electronics Letters, Vol. 31, no. 13, 22 June 1995, pp. 1032 - 1033.</span>
<a name="l00063"></a>00063 <span class="comment"> *</span>
<a name="l00064"></a>00064 <span class="comment"> * This circuit interpolates the downconverted sample (using the NCO developed by the Costas loop)</span>
<a name="l00065"></a>00065 <span class="comment"> * every mu samples, then it finds the sampling error based on this and the past symbols and the decision</span>
<a name="l00066"></a>00066 <span class="comment"> * made on the samples. Like the phase error detector, there are optimized decision algorithms for BPSK</span>
<a name="l00067"></a>00067 <span class="comment"> * and QPKS, but 8PSK uses another brute force computation against all possible symbols. The modifications</span>
<a name="l00068"></a>00068 <span class="comment"> * to the M&M used here reduce self-noise.</span>
<a name="l00069"></a>00069 <span class="comment"> *</span>
<a name="l00070"></a>00070 <span class="comment"> */</span>
<a name="l00071"></a>00071
<a name="l00072"></a><a class="code" href="classgr__mpsk__receiver__cc.html">00072</a> <span class="keyword">class </span><a class="code" href="classgr__mpsk__receiver__cc.html" title="This block takes care of receiving M-PSK modulated signals through phase, frequency...">gr_mpsk_receiver_cc</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...">gr_block</a>
<a name="l00073"></a>00073 {
<a name="l00074"></a>00074 <span class="keyword">public</span>:
<a name="l00075"></a>00075 <a class="code" href="classgr__mpsk__receiver__cc.html#a10ba226bab77791245135f070662dcf8">~gr_mpsk_receiver_cc</a> ();
<a name="l00076"></a>00076 <span class="keywordtype">void</span> <a class="code" href="classgr__mpsk__receiver__cc.html#acfde40e3149cdf0981b00ec7fd8b6109" title="Estimate input requirements given output request.">forecast</a>(<span class="keywordtype">int</span> noutput_items, <a class="code" href="classstd_1_1vector.html">gr_vector_int</a> &ninput_items_required);
<a name="l00077"></a>00077 <span class="keywordtype">int</span> <a class="code" href="classgr__mpsk__receiver__cc.html#aaa5dc2c51fc0a558733edfafbf95e4c9" title="compute output items from input items">general_work</a> (<span class="keywordtype">int</span> noutput_items,
<a name="l00078"></a>00078 <a class="code" href="classstd_1_1vector.html">gr_vector_int</a> &ninput_items,
<a name="l00079"></a>00079 <a class="code" href="classstd_1_1vector.html">gr_vector_const_void_star</a> &input_items,
<a name="l00080"></a>00080 <a class="code" href="classstd_1_1vector.html">gr_vector_void_star</a> &output_items);
<a name="l00081"></a>00081
<a name="l00082"></a>00082
<a name="l00083"></a>00083 <span class="comment">// Member functions related to the symbol tracking portion of the receiver</span><span class="comment"></span>
<a name="l00084"></a>00084 <span class="comment"> //! (M&M) Returns current value of mu</span>
<a name="l00085"></a><a class="code" href="classgr__mpsk__receiver__cc.html#a5a8d656fed27db70a3b90bf8e5739c58">00085</a> <span class="comment"></span> <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a5a8d656fed27db70a3b90bf8e5739c58" title="(M&amp;M) Returns current value of mu">mu</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> d_mu;}
<a name="l00086"></a>00086 <span class="comment"></span>
<a name="l00087"></a>00087 <span class="comment"> //! (M&M) Returns current value of omega</span>
<a name="l00088"></a><a class="code" href="classgr__mpsk__receiver__cc.html#a871efa619b3de0882272c5c8def64250">00088</a> <span class="comment"></span> <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a871efa619b3de0882272c5c8def64250" title="(M&amp;M) Returns current value of omega">omega</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> d_omega;}
<a name="l00089"></a>00089 <span class="comment"></span>
<a name="l00090"></a>00090 <span class="comment"> //! (M&M) Returns mu gain factor</span>
<a name="l00091"></a><a class="code" href="classgr__mpsk__receiver__cc.html#ab35c94b9fa4206794dede51d2174f26f">00091</a> <span class="comment"></span> <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#ab35c94b9fa4206794dede51d2174f26f" title="(M&amp;M) Returns mu gain factor">gain_mu</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> d_gain_mu;}
<a name="l00092"></a>00092 <span class="comment"></span>
<a name="l00093"></a>00093 <span class="comment"> //! (M&M) Returns omega gain factor</span>
<a name="l00094"></a><a class="code" href="classgr__mpsk__receiver__cc.html#a3bf2b3d7f8aa2f03b908ec1dd361ecb8">00094</a> <span class="comment"></span> <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a3bf2b3d7f8aa2f03b908ec1dd361ecb8" title="(M&amp;M) Returns omega gain factor">gain_omega</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> d_gain_omega;}
<a name="l00095"></a>00095 <span class="comment"></span>
<a name="l00096"></a>00096 <span class="comment"> //! (M&M) Sets value of mu</span>
<a name="l00097"></a><a class="code" href="classgr__mpsk__receiver__cc.html#a718112e3123378f3e79595c707564aec">00097</a> <span class="comment"></span> <span class="keywordtype">void</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a718112e3123378f3e79595c707564aec" title="(M&amp;M) Sets value of mu">set_mu</a> (<span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a5a8d656fed27db70a3b90bf8e5739c58" title="(M&amp;M) Returns current value of mu">mu</a>) { d_mu = mu; }
<a name="l00098"></a>00098 <span class="comment"></span>
<a name="l00099"></a>00099 <span class="comment"> //! (M&M) Sets value of omega and its min and max values </span>
<a name="l00100"></a><a class="code" href="classgr__mpsk__receiver__cc.html#a5858d935798398ed16221641a6e00254">00100</a> <span class="comment"></span> <span class="keywordtype">void</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a5858d935798398ed16221641a6e00254" title="(M&amp;M) Sets value of omega and its min and max values">set_omega</a> (<span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a871efa619b3de0882272c5c8def64250" title="(M&amp;M) Returns current value of omega">omega</a>) {
<a name="l00101"></a>00101 d_omega = omega;
<a name="l00102"></a>00102 d_min_omega = omega*(1.0 - d_omega_rel);
<a name="l00103"></a>00103 d_max_omega = omega*(1.0 + d_omega_rel);
<a name="l00104"></a>00104 d_omega_mid = 0.5*(d_min_omega+d_max_omega);
<a name="l00105"></a>00105 }
<a name="l00106"></a>00106 <span class="comment"></span>
<a name="l00107"></a>00107 <span class="comment"> //! (M&M) Sets value for mu gain factor</span>
<a name="l00108"></a><a class="code" href="classgr__mpsk__receiver__cc.html#a0f565a812cdf79bace6c9da16770c551">00108</a> <span class="comment"></span> <span class="keywordtype">void</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a0f565a812cdf79bace6c9da16770c551" title="(M&amp;M) Sets value for mu gain factor">set_gain_mu</a> (<span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#ab35c94b9fa4206794dede51d2174f26f" title="(M&amp;M) Returns mu gain factor">gain_mu</a>) { d_gain_mu = gain_mu; }
<a name="l00109"></a>00109 <span class="comment"></span>
<a name="l00110"></a>00110 <span class="comment"> //! (M&M) Sets value for omega gain factor</span>
<a name="l00111"></a><a class="code" href="classgr__mpsk__receiver__cc.html#a38e6d044fed315c5b2c02d92aef05a41">00111</a> <span class="comment"></span> <span class="keywordtype">void</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a38e6d044fed315c5b2c02d92aef05a41" title="(M&amp;M) Sets value for omega gain factor">set_gain_omega</a> (<span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a3bf2b3d7f8aa2f03b908ec1dd361ecb8" title="(M&amp;M) Returns omega gain factor">gain_omega</a>) { d_gain_omega = gain_omega; }
<a name="l00112"></a>00112
<a name="l00113"></a>00113
<a name="l00114"></a>00114
<a name="l00115"></a>00115 <span class="comment">// Member function related to the phase/frequency tracking portion of the receiver</span><span class="comment"></span>
<a name="l00116"></a>00116 <span class="comment"> //! (CL) Returns the value for alpha (the phase gain term)</span>
<a name="l00117"></a><a class="code" href="classgr__mpsk__receiver__cc.html#a193dbf8c468eb40b901ea15d17f23837">00117</a> <span class="comment"></span> <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a193dbf8c468eb40b901ea15d17f23837" title="(CL) Returns the value for alpha (the phase gain term)">alpha</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> d_alpha; }
<a name="l00118"></a>00118 <span class="comment"></span>
<a name="l00119"></a>00119 <span class="comment"> //! (CL) Returns the value of beta (the frequency gain term)</span>
<a name="l00120"></a><a class="code" href="classgr__mpsk__receiver__cc.html#a2854f1584948a1ae9985c6466dc042bc">00120</a> <span class="comment"></span> <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a2854f1584948a1ae9985c6466dc042bc" title="(CL) Returns the value of beta (the frequency gain term)">beta</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> d_beta; }
<a name="l00121"></a>00121 <span class="comment"></span>
<a name="l00122"></a>00122 <span class="comment"> //! (CL) Returns the current value of the frequency of the NCO in the Costas loop</span>
<a name="l00123"></a><a class="code" href="classgr__mpsk__receiver__cc.html#a0e23b688c75c93f803c5e9ddf3635083">00123</a> <span class="comment"></span> <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a0e23b688c75c93f803c5e9ddf3635083" title="(CL) Returns the current value of the frequency of the NCO in the Costas loop">freq</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> d_freq; }
<a name="l00124"></a>00124 <span class="comment"></span>
<a name="l00125"></a>00125 <span class="comment"> //! (CL) Returns the current value of the phase of the NCO in the Costal loop</span>
<a name="l00126"></a><a class="code" href="classgr__mpsk__receiver__cc.html#a5ddaf419bdaa5e924d2c84e94edd47b2">00126</a> <span class="comment"></span> <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a5ddaf419bdaa5e924d2c84e94edd47b2" title="(CL) Returns the current value of the phase of the NCO in the Costal loop">phase</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> d_phase; }
<a name="l00127"></a>00127 <span class="comment"></span>
<a name="l00128"></a>00128 <span class="comment"> //! (CL) Sets the value for alpha (the phase gain term)</span>
<a name="l00129"></a><a class="code" href="classgr__mpsk__receiver__cc.html#a20a85bfa65ce8d48b02079866ad9be5c">00129</a> <span class="comment"></span> <span class="keywordtype">void</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a20a85bfa65ce8d48b02079866ad9be5c" title="(CL) Sets the value for alpha (the phase gain term)">set_alpha</a>(<span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a193dbf8c468eb40b901ea15d17f23837" title="(CL) Returns the value for alpha (the phase gain term)">alpha</a>) { d_alpha = alpha; }
<a name="l00130"></a>00130 <span class="comment"></span>
<a name="l00131"></a>00131 <span class="comment"> //! (CL) Setss the value of beta (the frequency gain term)</span>
<a name="l00132"></a><a class="code" href="classgr__mpsk__receiver__cc.html#aaad856bd04d823d99c1e42e050a6297e">00132</a> <span class="comment"></span> <span class="keywordtype">void</span> <a class="code" href="classgr__mpsk__receiver__cc.html#aaad856bd04d823d99c1e42e050a6297e" title="(CL) Setss the value of beta (the frequency gain term)">set_beta</a>(<span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a2854f1584948a1ae9985c6466dc042bc" title="(CL) Returns the value of beta (the frequency gain term)">beta</a>) { d_beta = beta; }
<a name="l00133"></a>00133 <span class="comment"></span>
<a name="l00134"></a>00134 <span class="comment"> //! (CL) Sets the current value of the frequency of the NCO in the Costas loop</span>
<a name="l00135"></a><a class="code" href="classgr__mpsk__receiver__cc.html#aecbb08bd21f1d9a4b01a828a2177d4ec">00135</a> <span class="comment"></span> <span class="keywordtype">void</span> <a class="code" href="classgr__mpsk__receiver__cc.html#aecbb08bd21f1d9a4b01a828a2177d4ec" title="(CL) Sets the current value of the frequency of the NCO in the Costas loop">set_freq</a>(<span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a0e23b688c75c93f803c5e9ddf3635083" title="(CL) Returns the current value of the frequency of the NCO in the Costas loop">freq</a>) { d_freq = freq; }
<a name="l00136"></a>00136 <span class="comment"></span>
<a name="l00137"></a>00137 <span class="comment"> //! (CL) Setss the current value of the phase of the NCO in the Costal loop</span>
<a name="l00138"></a><a class="code" href="classgr__mpsk__receiver__cc.html#a67f26ed1d5099d3ef09b39e389e1e85f">00138</a> <span class="comment"></span> <span class="keywordtype">void</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a67f26ed1d5099d3ef09b39e389e1e85f" title="(CL) Setss the current value of the phase of the NCO in the Costal loop">set_phase</a>(<span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a5ddaf419bdaa5e924d2c84e94edd47b2" title="(CL) Returns the current value of the phase of the NCO in the Costal loop">phase</a>) { d_phase = phase; }
<a name="l00139"></a>00139
<a name="l00140"></a>00140
<a name="l00141"></a>00141 <span class="keyword">protected</span>:
<a name="l00142"></a>00142 <span class="comment"></span>
<a name="l00143"></a>00143 <span class="comment"> /*!</span>
<a name="l00144"></a>00144 <span class="comment"> * \brief Constructor to synchronize incoming M-PSK symbols</span>
<a name="l00145"></a>00145 <span class="comment"> *</span>
<a name="l00146"></a>00146 <span class="comment"> * \param M modulation order of the M-PSK modulation</span>
<a name="l00147"></a>00147 <span class="comment"> * \param theta any constant phase rotation from the real axis of the constellation</span>
<a name="l00148"></a>00148 <span class="comment"> * \param alpha gain parameter to adjust the phase in the Costas loop (~0.01)</span>
<a name="l00149"></a>00149 <span class="comment"> * \param beta gain parameter to adjust the frequency in the Costas loop (~alpha^2/4) </span>
<a name="l00150"></a>00150 <span class="comment"> * \param fmin minimum normalized frequency value the loop can achieve</span>
<a name="l00151"></a>00151 <span class="comment"> * \param fmax maximum normalized frequency value the loop can achieve</span>
<a name="l00152"></a>00152 <span class="comment"> * \param mu initial parameter for the interpolator [0,1]</span>
<a name="l00153"></a>00153 <span class="comment"> * \param gain_mu gain parameter of the M&M error signal to adjust mu (~0.05)</span>
<a name="l00154"></a>00154 <span class="comment"> * \param omega initial value for the number of symbols between samples (~number of samples/symbol)</span>
<a name="l00155"></a>00155 <span class="comment"> * \param gain_omega gain parameter to adjust omega based on the error (~omega^2/4)</span>
<a name="l00156"></a>00156 <span class="comment"> * \param omega_rel sets the maximum (omega*(1+omega_rel)) and minimum (omega*(1+omega_rel)) omega (~0.005)</span>
<a name="l00157"></a>00157 <span class="comment"> *</span>
<a name="l00158"></a>00158 <span class="comment"> * The constructor also chooses which phase detector and decision maker to use in the work loop based on the</span>
<a name="l00159"></a>00159 <span class="comment"> * value of M.</span>
<a name="l00160"></a>00160 <span class="comment"> */</span>
<a name="l00161"></a>00161 <a class="code" href="classgr__mpsk__receiver__cc.html#ad80459b4f33dba47f555263abe617ff2" title="Constructor to synchronize incoming M-PSK symbols.">gr_mpsk_receiver_cc</a> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> M, <span class="keywordtype">float</span> theta,
<a name="l00162"></a>00162 <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a193dbf8c468eb40b901ea15d17f23837" title="(CL) Returns the value for alpha (the phase gain term)">alpha</a>, <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a2854f1584948a1ae9985c6466dc042bc" title="(CL) Returns the value of beta (the frequency gain term)">beta</a>,
<a name="l00163"></a>00163 <span class="keywordtype">float</span> fmin, <span class="keywordtype">float</span> fmax,
<a name="l00164"></a>00164 <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a5a8d656fed27db70a3b90bf8e5739c58" title="(M&amp;M) Returns current value of mu">mu</a>, <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#ab35c94b9fa4206794dede51d2174f26f" title="(M&amp;M) Returns mu gain factor">gain_mu</a>,
<a name="l00165"></a>00165 <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a871efa619b3de0882272c5c8def64250" title="(M&amp;M) Returns current value of omega">omega</a>, <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a3bf2b3d7f8aa2f03b908ec1dd361ecb8" title="(M&amp;M) Returns omega gain factor">gain_omega</a>, <span class="keywordtype">float</span> omega_rel);
<a name="l00166"></a>00166
<a name="l00167"></a>00167 <span class="keywordtype">void</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a90c62a5f2f292dd19a89f27416abd99f">make_constellation</a>();
<a name="l00168"></a>00168 <span class="keywordtype">void</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a9b2e8da6e563eaea5403bc7050d96ebc">mm_sampler</a>(<span class="keyword">const</span> <a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> symbol);
<a name="l00169"></a>00169 <span class="keywordtype">void</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a179ff1d027fc821ce6c14450bf66c880">mm_error_tracking</a>(<a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> sample);
<a name="l00170"></a>00170 <span class="keywordtype">void</span> <a class="code" href="classgr__mpsk__receiver__cc.html#af901b02e3430c22a8a61469892408c44">phase_error_tracking</a>(<a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> sample);
<a name="l00171"></a>00171
<a name="l00172"></a>00172 <span class="comment"></span>
<a name="l00173"></a>00173 <span class="comment">/*!</span>
<a name="l00174"></a>00174 <span class="comment"> * \brief Phase error detector for MPSK modulations.</span>
<a name="l00175"></a>00175 <span class="comment"> *</span>
<a name="l00176"></a>00176 <span class="comment"> * \param sample the I&Q sample from which to determine the phase error</span>
<a name="l00177"></a>00177 <span class="comment"> *</span>
<a name="l00178"></a>00178 <span class="comment"> * This function determines the phase error for any MPSK signal by creating a set of PSK constellation points</span>
<a name="l00179"></a>00179 <span class="comment"> * and doing a brute-force search to see which point minimizes the Euclidean distance. This point is then used</span>
<a name="l00180"></a>00180 <span class="comment"> * to derotate the sample to the real-axis and a atan (using the fast approximation function) to determine the</span>
<a name="l00181"></a>00181 <span class="comment"> * phase difference between the incoming sample and the real constellation point</span>
<a name="l00182"></a>00182 <span class="comment"> *</span>
<a name="l00183"></a>00183 <span class="comment"> * This should be cleaned up and made more efficient.</span>
<a name="l00184"></a>00184 <span class="comment"> *</span>
<a name="l00185"></a>00185 <span class="comment"> * \returns the approximated phase error.</span>
<a name="l00186"></a>00186 <span class="comment"> */</span>
<a name="l00187"></a>00187 <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#ac20b225f3beb3cc0c62c931cda71797e" title="Phase error detector for MPSK modulations.">phase_error_detector_generic</a>(<a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> sample) <span class="keyword">const</span>; <span class="comment">// generic for M but more costly</span>
<a name="l00188"></a>00188 <span class="comment"></span>
<a name="l00189"></a>00189 <span class="comment"> /*!</span>
<a name="l00190"></a>00190 <span class="comment"> * \brief Phase error detector for BPSK modulation.</span>
<a name="l00191"></a>00191 <span class="comment"> *</span>
<a name="l00192"></a>00192 <span class="comment"> * \param sample the I&Q sample from which to determine the phase error</span>
<a name="l00193"></a>00193 <span class="comment"> *</span>
<a name="l00194"></a>00194 <span class="comment"> * This function determines the phase error using a simple BPSK phase error detector by multiplying the real</span>
<a name="l00195"></a>00195 <span class="comment"> * and imaginary (the error signal) components together. As the imaginary part goes to 0, so does this error.</span>
<a name="l00196"></a>00196 <span class="comment"> *</span>
<a name="l00197"></a>00197 <span class="comment"> * \returns the approximated phase error.</span>
<a name="l00198"></a>00198 <span class="comment"> */</span>
<a name="l00199"></a>00199 <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a9dd3762234c6fa83673809e2a94b4bdb" title="Phase error detector for BPSK modulation.">phase_error_detector_bpsk</a>(<a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> sample) <span class="keyword">const</span>; <span class="comment">// optimized for BPSK</span>
<a name="l00200"></a>00200 <span class="comment"></span>
<a name="l00201"></a>00201 <span class="comment"> /*!</span>
<a name="l00202"></a>00202 <span class="comment"> * \brief Phase error detector for QPSK modulation.</span>
<a name="l00203"></a>00203 <span class="comment"> *</span>
<a name="l00204"></a>00204 <span class="comment"> * \param sample the I&Q sample from which to determine the phase error</span>
<a name="l00205"></a>00205 <span class="comment"> *</span>
<a name="l00206"></a>00206 <span class="comment"> * This function determines the phase error using the limiter approach in a standard 4th order Costas loop</span>
<a name="l00207"></a>00207 <span class="comment"> *</span>
<a name="l00208"></a>00208 <span class="comment"> * \returns the approximated phase error.</span>
<a name="l00209"></a>00209 <span class="comment"> */</span>
<a name="l00210"></a>00210 <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a53140b9e77b8f4b37cc04996319c3f2c" title="Phase error detector for QPSK modulation.">phase_error_detector_qpsk</a>(<a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> sample) <span class="keyword">const</span>;
<a name="l00211"></a>00211
<a name="l00212"></a>00212
<a name="l00213"></a>00213 <span class="comment"></span>
<a name="l00214"></a>00214 <span class="comment"> /*!</span>
<a name="l00215"></a>00215 <span class="comment"> * \brief Decision maker for a generic MPSK constellation.</span>
<a name="l00216"></a>00216 <span class="comment"> *</span>
<a name="l00217"></a>00217 <span class="comment"> * \param sample the baseband I&Q sample from which to make the decision</span>
<a name="l00218"></a>00218 <span class="comment"> *</span>
<a name="l00219"></a>00219 <span class="comment"> * This decision maker is a generic implementation that does a brute-force search </span>
<a name="l00220"></a>00220 <span class="comment"> * for the constellation point that minimizes the error between it and the incoming signal.</span>
<a name="l00221"></a>00221 <span class="comment"> *</span>
<a name="l00222"></a>00222 <span class="comment"> * \returns the index to d_constellation that minimizes the error/</span>
<a name="l00223"></a>00223 <span class="comment"> */</span>
<a name="l00224"></a>00224 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a17ce465de930868d0e37017315458fa7" title="Decision maker for a generic MPSK constellation.">decision_generic</a>(<a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> sample) <span class="keyword">const</span>;
<a name="l00225"></a>00225
<a name="l00226"></a>00226 <span class="comment"></span>
<a name="l00227"></a>00227 <span class="comment"> /*!</span>
<a name="l00228"></a>00228 <span class="comment"> * \brief Decision maker for BPSK constellation.</span>
<a name="l00229"></a>00229 <span class="comment"> *</span>
<a name="l00230"></a>00230 <span class="comment"> * \param sample the baseband I&Q sample from which to make the decision</span>
<a name="l00231"></a>00231 <span class="comment"> *</span>
<a name="l00232"></a>00232 <span class="comment"> * This decision maker is a simple slicer function that makes a decision on the symbol based on its</span>
<a name="l00233"></a>00233 <span class="comment"> * placement on the real axis of greater than 0 or less than 0; the quadrature component is always 0.</span>
<a name="l00234"></a>00234 <span class="comment"> *</span>
<a name="l00235"></a>00235 <span class="comment"> * \returns the index to d_constellation that minimizes the error/</span>
<a name="l00236"></a>00236 <span class="comment"> */</span>
<a name="l00237"></a>00237 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a0233483a35601b8d8aa6cb4629014cf0" title="Decision maker for BPSK constellation.">decision_bpsk</a>(<a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> sample) <span class="keyword">const</span>;
<a name="l00238"></a>00238
<a name="l00239"></a>00239 <span class="comment"></span>
<a name="l00240"></a>00240 <span class="comment"> /*!</span>
<a name="l00241"></a>00241 <span class="comment"> * \brief Decision maker for QPSK constellation.</span>
<a name="l00242"></a>00242 <span class="comment"> *</span>
<a name="l00243"></a>00243 <span class="comment"> * \param sample the baseband I&Q sample from which to make the decision</span>
<a name="l00244"></a>00244 <span class="comment"> *</span>
<a name="l00245"></a>00245 <span class="comment"> * This decision maker is a simple slicer function that makes a decision on the symbol based on its</span>
<a name="l00246"></a>00246 <span class="comment"> * placement versus both axes and returns which quadrant the symbol is in.</span>
<a name="l00247"></a>00247 <span class="comment"> *</span>
<a name="l00248"></a>00248 <span class="comment"> * \returns the index to d_constellation that minimizes the error/</span>
<a name="l00249"></a>00249 <span class="comment"> */</span>
<a name="l00250"></a>00250 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a93ebc560d653963f6100c62a81db84be" title="Decision maker for QPSK constellation.">decision_qpsk</a>(<a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> sample) <span class="keyword">const</span>;
<a name="l00251"></a>00251
<a name="l00252"></a>00252 <span class="keyword">private</span>:
<a name="l00253"></a>00253 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> d_M;
<a name="l00254"></a>00254 <span class="keywordtype">float</span> d_theta;
<a name="l00255"></a>00255
<a name="l00256"></a>00256 <span class="comment">// Members related to carrier and phase tracking</span>
<a name="l00257"></a>00257 <span class="keywordtype">float</span> d_alpha;
<a name="l00258"></a>00258 <span class="keywordtype">float</span> d_beta;
<a name="l00259"></a>00259 <span class="keywordtype">float</span> d_freq, d_max_freq, d_min_freq;
<a name="l00260"></a>00260 <span class="keywordtype">float</span> d_phase;
<a name="l00261"></a>00261 <span class="comment"></span>
<a name="l00262"></a>00262 <span class="comment">/*!</span>
<a name="l00263"></a>00263 <span class="comment"> * \brief Decision maker function pointer </span>
<a name="l00264"></a>00264 <span class="comment"> *</span>
<a name="l00265"></a>00265 <span class="comment"> * \param sample the baseband I&Q sample from which to make the decision</span>
<a name="l00266"></a>00266 <span class="comment"> *</span>
<a name="l00267"></a>00267 <span class="comment"> * This is a function pointer that is set in the constructor to point to the proper decision function</span>
<a name="l00268"></a>00268 <span class="comment"> * for the specified constellation order.</span>
<a name="l00269"></a>00269 <span class="comment"> *</span>
<a name="l00270"></a>00270 <span class="comment"> * \return index into d_constellation point that is the closest to the recieved sample</span>
<a name="l00271"></a>00271 <span class="comment"> */</span>
<a name="l00272"></a>00272 <span class="keywordtype">unsigned</span> int (<a class="code" href="classgr__mpsk__receiver__cc.html" title="This block takes care of receiving M-PSK modulated signals through phase, frequency...">gr_mpsk_receiver_cc</a>::*d_decision)(<a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> sample) <span class="keyword">const</span>; <span class="comment">// pointer to decision function</span>
<a name="l00273"></a>00273
<a name="l00274"></a>00274
<a name="l00275"></a>00275 <a class="code" href="classstd_1_1vector.html">std::vector<gr_complex></a> d_constellation;
<a name="l00276"></a>00276 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> d_current_const_point;
<a name="l00277"></a>00277
<a name="l00278"></a>00278 <span class="comment">// Members related to symbol timing</span>
<a name="l00279"></a>00279 <span class="keywordtype">float</span> d_mu, d_gain_mu;
<a name="l00280"></a>00280 <span class="keywordtype">float</span> d_omega, d_gain_omega, d_omega_rel, d_max_omega, d_min_omega, d_omega_mid;
<a name="l00281"></a>00281 <a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> d_p_2T, d_p_1T, d_p_0T;
<a name="l00282"></a>00282 <a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> d_c_2T, d_c_1T, d_c_0T;
<a name="l00283"></a>00283 <span class="comment"></span>
<a name="l00284"></a>00284 <span class="comment"> /*!</span>
<a name="l00285"></a>00285 <span class="comment"> * \brief Phase error detector function pointer </span>
<a name="l00286"></a>00286 <span class="comment"> *</span>
<a name="l00287"></a>00287 <span class="comment"> * \param sample the I&Q sample from which to determine the phase error</span>
<a name="l00288"></a>00288 <span class="comment"> *</span>
<a name="l00289"></a>00289 <span class="comment"> * This is a function pointer that is set in the constructor to point to the proper phase error detector</span>
<a name="l00290"></a>00290 <span class="comment"> * function for the specified constellation order.</span>
<a name="l00291"></a>00291 <span class="comment"> */</span>
<a name="l00292"></a>00292 float (<a class="code" href="classgr__mpsk__receiver__cc.html" title="This block takes care of receiving M-PSK modulated signals through phase, frequency...">gr_mpsk_receiver_cc</a>::*d_phase_error_detector)(<a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> sample) <span class="keyword">const</span>;
<a name="l00293"></a>00293
<a name="l00294"></a>00294 <span class="comment"></span>
<a name="l00295"></a>00295 <span class="comment"> //! get interpolated value</span>
<a name="l00296"></a>00296 <span class="comment"></span> <a class="code" href="classgri__mmse__fir__interpolator__cc.html" title="Compute intermediate samples between signal samples x(k*Ts)This implements a Mininum...">gri_mmse_fir_interpolator_cc</a> *d_interp;
<a name="l00297"></a>00297 <span class="comment"></span>
<a name="l00298"></a>00298 <span class="comment"> //! delay line length.</span>
<a name="l00299"></a>00299 <span class="comment"></span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> DLLEN = 8;
<a name="l00300"></a>00300 <span class="comment"></span>
<a name="l00301"></a>00301 <span class="comment"> //! delay line plus some length for overflow protection</span>
<a name="l00302"></a>00302 <span class="comment"></span> <a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> d_dl[2*DLLEN] __attribute__ ((aligned(8)));
<a name="l00303"></a>00303 <span class="comment"></span>
<a name="l00304"></a>00304 <span class="comment"> //! index to delay line</span>
<a name="l00305"></a>00305 <span class="comment"></span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> d_dl_idx;
<a name="l00306"></a>00306
<a name="l00307"></a>00307 <span class="keyword">friend</span> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">gr_mpsk_receiver_cc_sptr</a>
<a name="l00308"></a>00308 <a class="code" href="classgr__mpsk__receiver__cc.html#a302053914cb025ad3fe4eb65b9f30bf2">gr_make_mpsk_receiver_cc</a> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> M, <span class="keywordtype">float</span> theta,
<a name="l00309"></a>00309 <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a193dbf8c468eb40b901ea15d17f23837" title="(CL) Returns the value for alpha (the phase gain term)">alpha</a>, <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a2854f1584948a1ae9985c6466dc042bc" title="(CL) Returns the value of beta (the frequency gain term)">beta</a>,
<a name="l00310"></a>00310 <span class="keywordtype">float</span> fmin, <span class="keywordtype">float</span> fmax,
<a name="l00311"></a>00311 <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a5a8d656fed27db70a3b90bf8e5739c58" title="(M&amp;M) Returns current value of mu">mu</a>, <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#ab35c94b9fa4206794dede51d2174f26f" title="(M&amp;M) Returns mu gain factor">gain_mu</a>,
<a name="l00312"></a>00312 <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a871efa619b3de0882272c5c8def64250" title="(M&amp;M) Returns current value of omega">omega</a>, <span class="keywordtype">float</span> <a class="code" href="classgr__mpsk__receiver__cc.html#a3bf2b3d7f8aa2f03b908ec1dd361ecb8" title="(M&amp;M) Returns omega gain factor">gain_omega</a>, <span class="keywordtype">float</span> omega_rel);
<a name="l00313"></a>00313 };
<a name="l00314"></a>00314
<a name="l00315"></a>00315 <span class="preprocessor">#endif</span>
</pre></div></div>
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