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<div class="title">digital_impl_mpsk_snr_est.h</div> </div>
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<a href="digital__impl__mpsk__snr__est_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/* -*- c++ -*- */</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * Copyright 2011 Free Software Foundation, Inc.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * </span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * This file is part of GNU Radio</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * </span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * GNU Radio is free software; you can redistribute it and/or modify</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * it under the terms of the GNU General Public License as published by</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * the Free Software Foundation; either version 3, or (at your option)</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * any later version.</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * </span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * GNU Radio is distributed in the hope that it will be useful,</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * GNU General Public License for more details.</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * </span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * You should have received a copy of the GNU General Public License</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * along with GNU Radio; see the file COPYING. If not, write to</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * the Free Software Foundation, Inc., 51 Franklin Street,</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * Boston, MA 02110-1301, USA.</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#ifndef INCLUDED_DIGITAL_IMPL_MPSK_SNR_EST_H</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor"></span><span class="preprocessor">#define INCLUDED_DIGITAL_IMPL_MPSK_SNR_EST_H</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include <<a class="code" href="digital__api_8h.html">digital_api.h</a>></span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include <<a class="code" href="gr__sync__block_8h.html">gr_sync_block.h</a>></span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"></span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">//! Enum for the type of SNR estimator to select</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"></span><span class="comment">/*! \ingroup snr_blk</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * \anchor ref_snr_est_types</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * Below are some ROUGH estimates of what values of SNR each of these</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> * types of estimators is good for. In general, these offer a</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> * trade-off between accuracy and performance.</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> * \li SNR_EST_SIMPLE: Simple estimator (>= 7 dB)</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> * \li SNR_EST_SKEW: Skewness-base est (>= 5 dB)</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> * \li SNR_EST_M2M4: 2nd & 4th moment est (>= 1 dB)</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> * \li SNR_EST_SVR: SVR-based est (>= 0dB)</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment">*/</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"><a class="code" href="group__snr__blk.html#gad332265a312e8dfe1584460d8859a853"> 41</a></span> <span class="keyword">enum</span> <a class="code" href="group__snr__blk.html#gad332265a312e8dfe1584460d8859a853" title="Enum for the type of SNR estimator to select.">snr_est_type_t</a> {</div>
<div class="line"><a name="l00042"></a><span class="lineno"><a class="code" href="group__snr__blk.html#ggad332265a312e8dfe1584460d8859a853a744e64b10fa2a4fe25e2e1aa20846cca"> 42</a></span>  <a class="code" href="group__snr__blk.html#ggad332265a312e8dfe1584460d8859a853a744e64b10fa2a4fe25e2e1aa20846cca">SNR_EST_SIMPLE</a> = 0, <span class="comment">// Simple estimator (>= 7 dB)</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"><a class="code" href="group__snr__blk.html#ggad332265a312e8dfe1584460d8859a853aec30ba8b1a8135d53f074d43e882bc98"> 43</a></span>  <a class="code" href="group__snr__blk.html#ggad332265a312e8dfe1584460d8859a853aec30ba8b1a8135d53f074d43e882bc98">SNR_EST_SKEW</a>, <span class="comment">// Skewness-base est (>= 5 dB)</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"><a class="code" href="group__snr__blk.html#ggad332265a312e8dfe1584460d8859a853aa64f2dcda2142a1f4912d570372c2c29"> 44</a></span>  <a class="code" href="group__snr__blk.html#ggad332265a312e8dfe1584460d8859a853aa64f2dcda2142a1f4912d570372c2c29">SNR_EST_M2M4</a>, <span class="comment">// 2nd & 4th moment est (>= 1 dB)</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"><a class="code" href="group__snr__blk.html#ggad332265a312e8dfe1584460d8859a853afba9d1c8c5268ac8e74931738681a797"> 45</a></span>  <a class="code" href="group__snr__blk.html#ggad332265a312e8dfe1584460d8859a853afba9d1c8c5268ac8e74931738681a797">SNR_EST_SVR</a> <span class="comment">// SVR-based est (>= 0dB)</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> };</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"></span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment">/*! \brief A parent class for SNR estimators, specifically for M-PSK</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> * signals in AWGN channels.</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> * \ingroup snr_blk</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"><a class="code" href="classdigital__impl__mpsk__snr__est.html"> 52</a></span> <span class="keyword">class </span><a class="code" href="digital__api_8h.html#ae14969f36ec69051c4b2f13a0db7e9ba">DIGITAL_API</a> <a class="code" href="classdigital__impl__mpsk__snr__est.html" title="A parent class for SNR estimators, specifically for M-PSK signals in AWGN channels.">digital_impl_mpsk_snr_est</a></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> {</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00055"></a><span class="lineno"><a class="code" href="classdigital__impl__mpsk__snr__est.html#a1fdb4b5cacb6a4f22ba7ecf947eb020b"> 55</a></span>  <span class="keywordtype">double</span> d_alpha, <a class="code" href="classdigital__impl__mpsk__snr__est.html#a1fdb4b5cacb6a4f22ba7ecf947eb020b">d_beta</a>;</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> </div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keyword">public</span>:<span class="comment"></span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"> /*! Constructor</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"> * Parameters:</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"> * \param alpha: the update rate of internal running average</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment"> * calculations.</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <a class="code" href="classdigital__impl__mpsk__snr__est.html" title="A parent class for SNR estimators, specifically for M-PSK signals in AWGN channels.">digital_impl_mpsk_snr_est</a>(<span class="keywordtype">double</span> alpha);</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keyword">virtual</span> ~<a class="code" href="classdigital__impl__mpsk__snr__est.html" title="A parent class for SNR estimators, specifically for M-PSK signals in AWGN channels.">digital_impl_mpsk_snr_est</a>();</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment"></span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment"> //! Get the running-average coefficient</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment"></span> <span class="keywordtype">double</span> alpha() <span class="keyword">const</span>;</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment"></span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment"> //! Set the running-average coefficient</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"></span> <span class="keywordtype">void</span> set_alpha(<span class="keywordtype">double</span> alpha);</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"></span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment"> //! Update the current registers</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment"></span> <span class="keyword">virtual</span> <span class="keywordtype">int</span> <a class="code" href="g72x_8h.html#a6e07fabf2aa75120f6124fe33d667b1e">update</a>(<span class="keywordtype">int</span> noutput_items,</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keyword">const</span> <a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> *in);</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"></span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment"> //! Use the register values to compute a new estimate</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment"></span> <span class="keyword">virtual</span> <span class="keywordtype">double</span> snr();</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> };</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> </div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="comment"></span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment">//! \brief SNR Estimator using simple mean/variance estimates.</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"></span><span class="comment">/*! \ingroup snr_blk</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment"> * A very simple SNR estimator that just uses mean and variance</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment"> * estimates of an M-PSK constellation. This esimator is quick and</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment"> * cheap and accurate for high SNR (above 7 dB or so) but quickly</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment"> * starts to overestimate the SNR at low SNR.</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"><a class="code" href="classdigital__impl__mpsk__snr__est__simple.html"> 90</a></span> <span class="keyword">class </span><a class="code" href="digital__api_8h.html#ae14969f36ec69051c4b2f13a0db7e9ba">DIGITAL_API</a> <a class="code" href="classdigital__impl__mpsk__snr__est__simple.html" title="SNR Estimator using simple mean/variance estimates.">digital_impl_mpsk_snr_est_simple</a> :</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keyword">public</span> <a class="code" href="classdigital__impl__mpsk__snr__est.html" title="A parent class for SNR estimators, specifically for M-PSK signals in AWGN channels.">digital_impl_mpsk_snr_est</a></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> {</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keyword">private</span>:</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordtype">double</span> d_y1, d_y2;</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  </div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keyword">public</span>:<span class="comment"></span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment"> /*! Constructor</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment"> * Parameters:</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment"> * \param alpha: the update rate of internal running average</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="comment"> * calculations.</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <a class="code" href="classdigital__impl__mpsk__snr__est__simple.html" title="SNR Estimator using simple mean/variance estimates.">digital_impl_mpsk_snr_est_simple</a>(<span class="keywordtype">double</span> alpha);</div>
<div class="line"><a name="l00104"></a><span class="lineno"><a class="code" href="classdigital__impl__mpsk__snr__est__simple.html#af9d047c13911601b644de74fcb9713e1"> 104</a></span>  <a class="code" href="classdigital__impl__mpsk__snr__est__simple.html#af9d047c13911601b644de74fcb9713e1">~digital_impl_mpsk_snr_est_simple</a>() {}</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> </div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordtype">int</span> <a class="code" href="classdigital__impl__mpsk__snr__est.html#a7aa10fcd79810905a81b92b244d702ee" title="Update the current registers.">update</a>(<span class="keywordtype">int</span> noutput_items,</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keyword">const</span> <a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> *in);</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordtype">double</span> <a class="code" href="classdigital__impl__mpsk__snr__est.html#a1f7e662d3eb8118bc77cec9b8ff16009" title="Use the register values to compute a new estimate.">snr</a>();</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> };</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> </div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="comment"></span></div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> <span class="comment">//! \brief SNR Estimator using skewness correction.</span></div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> <span class="comment"></span><span class="comment">/*! \ingroup snr_blk</span></div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment"> * This is an estimator that came from a discussion between Tom</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="comment"> * Rondeau and fred harris with no known paper reference. The idea is</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="comment"> * that at low SNR, the variance estimations will be affected because</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="comment"> * of fold-over around the decision boundaries, which results in a</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="comment"> * skewness to the samples. We estimate the skewness and use this as</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="comment"> * a correcting term.</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"><a class="code" href="classdigital__impl__mpsk__snr__est__skew.html"> 122</a></span> <span class="keyword">class </span><a class="code" href="digital__api_8h.html#ae14969f36ec69051c4b2f13a0db7e9ba">DIGITAL_API</a> <a class="code" href="classdigital__impl__mpsk__snr__est__skew.html" title="SNR Estimator using skewness correction.">digital_impl_mpsk_snr_est_skew</a> :</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="keyword">public</span> <a class="code" href="classdigital__impl__mpsk__snr__est.html" title="A parent class for SNR estimators, specifically for M-PSK signals in AWGN channels.">digital_impl_mpsk_snr_est</a></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> {</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keyword">private</span>:</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordtype">double</span> d_y1, d_y2, d_y3;</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  </div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keyword">public</span>:<span class="comment"></span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="comment"> /*! Constructor</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="comment"> * Parameters:</span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="comment"> * \param alpha: the update rate of internal running average</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="comment"> * calculations.</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <a class="code" href="classdigital__impl__mpsk__snr__est__skew.html" title="SNR Estimator using skewness correction.">digital_impl_mpsk_snr_est_skew</a>(<span class="keywordtype">double</span> alpha);</div>
<div class="line"><a name="l00136"></a><span class="lineno"><a class="code" href="classdigital__impl__mpsk__snr__est__skew.html#a20d9a03ad0dc6d9b85f631b6cec9c5e6"> 136</a></span>  <a class="code" href="classdigital__impl__mpsk__snr__est__skew.html#a20d9a03ad0dc6d9b85f631b6cec9c5e6">~digital_impl_mpsk_snr_est_skew</a>() {}</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> </div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keywordtype">int</span> <a class="code" href="classdigital__impl__mpsk__snr__est.html#a7aa10fcd79810905a81b92b244d702ee" title="Update the current registers.">update</a>(<span class="keywordtype">int</span> noutput_items,</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keyword">const</span> <a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> *in);</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <span class="keywordtype">double</span> <a class="code" href="classdigital__impl__mpsk__snr__est.html#a1f7e662d3eb8118bc77cec9b8ff16009" title="Use the register values to compute a new estimate.">snr</a>();</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> };</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> </div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="comment"></span></div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="comment">//! \brief SNR Estimator using 2nd and 4th-order moments.</span></div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="comment"></span><span class="comment">/*! \ingroup snr_blk</span></div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="comment"> * An SNR estimator for M-PSK signals that uses 2nd (M2) and 4th (M4)</span></div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="comment"> * order moments. This estimator uses knowledge of the kurtosis of</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> <span class="comment"> * the signal (k_a) and noise (k_w) to make its estimation. We use</span></div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="comment"> * Beaulieu's approximations here to M-PSK signals and AWGN channels</span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="comment"> * such that k_a=1 and k_w=2. These approximations significantly</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="comment"> * reduce the complexity of the calculations (and computations)</span></div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> <span class="comment"> * required.</span></div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> <span class="comment"> * Reference:</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> <span class="comment"> * D. R. Pauluzzi and N. C. Beaulieu, "A comparison of SNR</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> <span class="comment"> * estimation techniques for the AWGN channel," IEEE</span></div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> <span class="comment"> * Trans. Communications, Vol. 48, No. 10, pp. 1681-1691, 2000.</span></div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"><a class="code" href="classdigital__impl__mpsk__snr__est__m2m4.html"> 160</a></span> <span class="keyword">class </span><a class="code" href="digital__api_8h.html#ae14969f36ec69051c4b2f13a0db7e9ba">DIGITAL_API</a> <a class="code" href="classdigital__impl__mpsk__snr__est__m2m4.html" title="SNR Estimator using 2nd and 4th-order moments.">digital_impl_mpsk_snr_est_m2m4</a> :</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="keyword">public</span> <a class="code" href="classdigital__impl__mpsk__snr__est.html" title="A parent class for SNR estimators, specifically for M-PSK signals in AWGN channels.">digital_impl_mpsk_snr_est</a></div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span> {</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="keyword">private</span>:</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="keywordtype">double</span> d_y1, d_y2;</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  </div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="keyword">public</span>:<span class="comment"></span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> <span class="comment"> /*! Constructor</span></div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span> <span class="comment"> * Parameters:</span></div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span> <span class="comment"> * \param alpha: the update rate of internal running average</span></div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> <span class="comment"> * calculations.</span></div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <a class="code" href="classdigital__impl__mpsk__snr__est__m2m4.html" title="SNR Estimator using 2nd and 4th-order moments.">digital_impl_mpsk_snr_est_m2m4</a>(<span class="keywordtype">double</span> alpha);</div>
<div class="line"><a name="l00174"></a><span class="lineno"><a class="code" href="classdigital__impl__mpsk__snr__est__m2m4.html#a36ed440eb6db49904ce323b09ceb3134"> 174</a></span>  <a class="code" href="classdigital__impl__mpsk__snr__est__m2m4.html#a36ed440eb6db49904ce323b09ceb3134">~digital_impl_mpsk_snr_est_m2m4</a>() {}</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span> </div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keywordtype">int</span> <a class="code" href="classdigital__impl__mpsk__snr__est.html#a7aa10fcd79810905a81b92b244d702ee" title="Update the current registers.">update</a>(<span class="keywordtype">int</span> noutput_items,</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  <span class="keyword">const</span> <a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> *in);</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <span class="keywordtype">double</span> <a class="code" href="classdigital__impl__mpsk__snr__est.html#a1f7e662d3eb8118bc77cec9b8ff16009" title="Use the register values to compute a new estimate.">snr</a>();</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span> };</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> </div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span> <span class="comment"></span></div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span> <span class="comment">//! \brief SNR Estimator using 2nd and 4th-order moments.</span></div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span> <span class="comment"></span><span class="comment">/*! \ingroup snr_blk</span></div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span> <span class="comment"> * An SNR estimator for M-PSK signals that uses 2nd (M2) and 4th (M4)</span></div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span> <span class="comment"> * order moments. This estimator uses knowledge of the kurtosis of</span></div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span> <span class="comment"> * the signal (k_a) and noise (k_w) to make its estimation. In this</span></div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> <span class="comment"> * case, you can set your own estimations for k_a and k_w, the</span></div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> <span class="comment"> * kurtosis of the signal and noise, to fit this estimation better to</span></div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> <span class="comment"> * your signal and channel conditions.</span></div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> <span class="comment"> * A word of warning: this estimator has not been fully tested or</span></div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> <span class="comment"> * proved with any amount of rigor. The estimation for M4 in</span></div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span> <span class="comment"> * particular might be ignoring effectf of when k_a and k_w are</span></div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> <span class="comment"> * different. Use this estimator with caution and a copy of the</span></div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> <span class="comment"> * reference on hand.</span></div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span> <span class="comment"> * The digital_mpsk_snr_est_m2m4 assumes k_a and k_w to simplify the</span></div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span> <span class="comment"> * computations for M-PSK and AWGN channels. Use that estimator</span></div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span> <span class="comment"> * unless you have a way to guess or estimate these values here.</span></div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> <span class="comment"> * Original paper: </span></div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span> <span class="comment"> * R. Matzner, "An SNR estimation algorithm for complex baseband</span></div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span> <span class="comment"> * signal using higher order statistics," Facta Universitatis</span></div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span> <span class="comment"> * (Nis), no. 6, pp. 41-52, 1993.</span></div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span> <span class="comment"> * Reference used in derivation:</span></div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span> <span class="comment"> * D. R. Pauluzzi and N. C. Beaulieu, "A comparison of SNR</span></div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span> <span class="comment"> * estimation techniques for the AWGN channel," IEEE</span></div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span> <span class="comment"> * Trans. Communications, Vol. 48, No. 10, pp. 1681-1691, 2000.</span></div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00212"></a><span class="lineno"><a class="code" href="classdigital__impl__snr__est__m2m4.html"> 212</a></span> <span class="keyword">class </span><a class="code" href="digital__api_8h.html#ae14969f36ec69051c4b2f13a0db7e9ba">DIGITAL_API</a> <a class="code" href="classdigital__impl__snr__est__m2m4.html" title="SNR Estimator using 2nd and 4th-order moments.">digital_impl_snr_est_m2m4</a> :</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <span class="keyword">public</span> <a class="code" href="classdigital__impl__mpsk__snr__est.html" title="A parent class for SNR estimators, specifically for M-PSK signals in AWGN channels.">digital_impl_mpsk_snr_est</a></div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span> {</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="keyword">private</span>:</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="keywordtype">double</span> d_y1, d_y2;</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  <span class="keywordtype">double</span> d_ka, d_kw;</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  </div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  <span class="keyword">public</span>:<span class="comment"></span></div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span> <span class="comment"> /*! Constructor</span></div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span> <span class="comment"> * Parameters:</span></div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span> <span class="comment"> * \param alpha: the update rate of internal running average</span></div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span> <span class="comment"> * calculations.</span></div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> <span class="comment"> * \param ka: estimate of the signal kurtosis (1 for PSK)</span></div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> <span class="comment"> * \param kw: estimate of the channel noise kurtosis (2 for AWGN)</span></div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  <a class="code" href="classdigital__impl__snr__est__m2m4.html" title="SNR Estimator using 2nd and 4th-order moments.">digital_impl_snr_est_m2m4</a>(<span class="keywordtype">double</span> alpha, <span class="keywordtype">double</span> ka, <span class="keywordtype">double</span> kw);</div>
<div class="line"><a name="l00229"></a><span class="lineno"><a class="code" href="classdigital__impl__snr__est__m2m4.html#aadc719a1217f57f3023b48f06a3ed66b"> 229</a></span>  <a class="code" href="classdigital__impl__snr__est__m2m4.html#aadc719a1217f57f3023b48f06a3ed66b">~digital_impl_snr_est_m2m4</a>() {}</div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span> </div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <span class="keywordtype">int</span> <a class="code" href="classdigital__impl__mpsk__snr__est.html#a7aa10fcd79810905a81b92b244d702ee" title="Update the current registers.">update</a>(<span class="keywordtype">int</span> noutput_items,</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  <span class="keyword">const</span> <a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> *in);</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  <span class="keywordtype">double</span> <a class="code" href="classdigital__impl__mpsk__snr__est.html#a1f7e662d3eb8118bc77cec9b8ff16009" title="Use the register values to compute a new estimate.">snr</a>();</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span> };</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span> </div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span> <span class="comment"></span></div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span> <span class="comment">//! \brief Signal-to-Variation Ratio SNR Estimator.</span></div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span> <span class="comment"></span><span class="comment">/*! \ingroup snr_blk</span></div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span> <span class="comment"> * This estimator actually comes from an SNR estimator for M-PSK</span></div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span> <span class="comment"> * signals in fading channels, but this implementation is</span></div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span> <span class="comment"> * specifically for AWGN channels. The math was simplified to assume</span></div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span> <span class="comment"> * a signal and noise kurtosis (k_a and k_w) for M-PSK signals in</span></div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span> <span class="comment"> * AWGN. These approximations significantly reduce the complexity of</span></div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span> <span class="comment"> * the calculations (and computations) required.</span></div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span> <span class="comment"> * Original paper:</span></div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span> <span class="comment"> * A. L. Brandao, L. B. Lopes, and D. C. McLernon, "In-service</span></div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span> <span class="comment"> * monitoring of multipath delay and cochannel interference for</span></div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span> <span class="comment"> * indoor mobile communication systems," Proc. IEEE</span></div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span> <span class="comment"> * Int. Conf. Communications, vol. 3, pp. 1458-1462, May 1994.</span></div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span> <span class="comment"> * Reference:</span></div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span> <span class="comment"> * D. R. Pauluzzi and N. C. Beaulieu, "A comparison of SNR</span></div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span> <span class="comment"> * estimation techniques for the AWGN channel," IEEE</span></div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span> <span class="comment"> * Trans. Communications, Vol. 48, No. 10, pp. 1681-1691, 2000.</span></div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00258"></a><span class="lineno"><a class="code" href="classdigital__impl__mpsk__snr__est__svr.html"> 258</a></span> <span class="keyword">class </span><a class="code" href="digital__api_8h.html#ae14969f36ec69051c4b2f13a0db7e9ba">DIGITAL_API</a> <a class="code" href="classdigital__impl__mpsk__snr__est__svr.html" title="Signal-to-Variation Ratio SNR Estimator.">digital_impl_mpsk_snr_est_svr</a> :</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="keyword">public</span> <a class="code" href="classdigital__impl__mpsk__snr__est.html" title="A parent class for SNR estimators, specifically for M-PSK signals in AWGN channels.">digital_impl_mpsk_snr_est</a></div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span> {</div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  <span class="keyword">private</span>:</div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <span class="keywordtype">double</span> d_y1, d_y2;</div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  </div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  <span class="keyword">public</span>:<span class="comment"></span></div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span> <span class="comment"> /*! Constructor</span></div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span> <span class="comment"> * Parameters:</span></div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span> <span class="comment"> * \param alpha: the update rate of internal running average</span></div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span> <span class="comment"> * calculations.</span></div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  <a class="code" href="classdigital__impl__mpsk__snr__est__svr.html" title="Signal-to-Variation Ratio SNR Estimator.">digital_impl_mpsk_snr_est_svr</a>(<span class="keywordtype">double</span> alpha);</div>
<div class="line"><a name="l00272"></a><span class="lineno"><a class="code" href="classdigital__impl__mpsk__snr__est__svr.html#abe36e8a4631ef89561d6591da399e396"> 272</a></span>  <a class="code" href="classdigital__impl__mpsk__snr__est__svr.html#abe36e8a4631ef89561d6591da399e396">~digital_impl_mpsk_snr_est_svr</a>() {}</div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span> </div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="keywordtype">int</span> <a class="code" href="classdigital__impl__mpsk__snr__est.html#a7aa10fcd79810905a81b92b244d702ee" title="Update the current registers.">update</a>(<span class="keywordtype">int</span> noutput_items,</div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  <span class="keyword">const</span> <a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> *in);</div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="keywordtype">double</span> <a class="code" href="classdigital__impl__mpsk__snr__est.html#a1f7e662d3eb8118bc77cec9b8ff16009" title="Use the register values to compute a new estimate.">snr</a>();</div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span> };</div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span> </div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span> <span class="preprocessor">#endif </span><span class="comment">/* INCLUDED_DIGITAL_IMPL_MPSK_SNR_EST_H */</span><span class="preprocessor"></span></div>
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