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<a href="volk__32fc__s32f__power__spectrum__32f__a_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="preprocessor">#ifndef INCLUDED_volk_32fc_s32f_power_spectrum_32f_a_H</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="preprocessor"></span><span class="preprocessor">#define INCLUDED_volk_32fc_s32f_power_spectrum_32f_a_H</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="preprocessor">#include <<a class="code" href="inttypes_8h.html">inttypes.h</a>></span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include <stdio.h></span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="preprocessor">#include <math.h></span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> </div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#ifdef LV_HAVE_SSE3</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor"></span><span class="preprocessor">#include <pmmintrin.h></span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#ifdef LV_HAVE_LIB_SIMDMATH</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor"></span><span class="preprocessor">#include <simdmath.h></span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#endif </span><span class="comment">/* LV_HAVE_LIB_SIMDMATH */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor"></span><span class="comment"></span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">/*!</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> \brief Calculates the log10 power value for each input point</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> \param logPowerOutput The 10.0 * log10(r*r + i*i) for each data point</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> \param complexFFTInput The complex data output from the FFT point</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> \param normalizationFactor This value is divided against all the input values before the power is calculated</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> \param num_points The number of fft data points</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="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> volk_32fc_s32f_power_spectrum_32f_a_sse3(<span class="keywordtype">float</span>* logPowerOutput, <span class="keyword">const</span> <a class="code" href="volk__complex_8h.html#ace50e1c8ef539cdeee04bc86f0e99169">lv_32fc_t</a>* complexFFTInput, <span class="keyword">const</span> <span class="keywordtype">float</span> normalizationFactor, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> num_points){</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="keyword">const</span> <span class="keywordtype">float</span>* inputPtr = (<span class="keyword">const</span> <span class="keywordtype">float</span>*)complexFFTInput;</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="keywordtype">float</span>* destPtr = logPowerOutput;</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <a class="code" href="stdint_8h.html#aec6fcb673ff035718c238c8c9d544c47">uint64_t</a> number = 0;</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> iNormalizationFactor = 1.0 / normalizationFactor;</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#ifdef LV_HAVE_LIB_SIMDMATH</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor"></span> __m128 magScalar = _mm_set_ps1(10.0);</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  magScalar = _mm_div_ps(magScalar, logf4(magScalar));</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> </div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  __m128 invNormalizationFactor = _mm_set_ps1(iNormalizationFactor);</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> </div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  __m128 power;</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  __m128 input1, input2;</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keyword">const</span> <a class="code" href="stdint_8h.html#aec6fcb673ff035718c238c8c9d544c47">uint64_t</a> quarterPoints = num_points / 4;</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordflow">for</span>(;number < quarterPoints; number++){</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="comment">// Load the complex values</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  input1 =_mm_load_ps(inputPtr);</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  inputPtr += 4;</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  input2 =_mm_load_ps(inputPtr);</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  inputPtr += 4;</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="comment">// Apply the normalization factor</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  input1 = _mm_mul_ps(input1, invNormalizationFactor);</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  input2 = _mm_mul_ps(input2, invNormalizationFactor);</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">// Multiply each value by itself</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="comment">// (r1*r1), (i1*i1), (r2*r2), (i2*i2)</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  input1 = _mm_mul_ps(input1, input1);</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="comment">// (r3*r3), (i3*i3), (r4*r4), (i4*i4)</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  input2 = _mm_mul_ps(input2, input2);</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> </div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="comment">// Horizontal add, to add (r*r) + (i*i) for each complex value</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="comment">// (r1*r1)+(i1*i1), (r2*r2) + (i2*i2), (r3*r3)+(i3*i3), (r4*r4)+(i4*i4)</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  power = _mm_hadd_ps(input1, input2);</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="comment">// Calculate the natural log power</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  power = logf4(power);</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="comment">// Convert to log10 and multiply by 10.0</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  power = _mm_mul_ps(power, magScalar);</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="comment">// Store the floating point results</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  _mm_store_ps(destPtr, power);</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  destPtr += 4;</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  }</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> </div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  number = quarterPoints*4;</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="preprocessor">#endif </span><span class="comment">/* LV_HAVE_LIB_SIMDMATH */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="preprocessor"></span> <span class="comment">// Calculate the FFT for any remaining points</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> </div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordflow">for</span>(; number < num_points; number++){</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="comment">// Calculate dBm</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="comment">// 50 ohm load assumption</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="comment">// 10 * log10 (v^2 / (2 * 50.0 * .001)) = 10 * log10( v^2 * 10)</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="comment">// 75 ohm load assumption</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="comment">// 10 * log10 (v^2 / (2 * 75.0 * .001)) = 10 * log10( v^2 * 15)</span></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>  <span class="keyword">const</span> <span class="keywordtype">float</span> real = *inputPtr++ * iNormalizationFactor;</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> imag = *inputPtr++ * iNormalizationFactor;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> </div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  *destPtr = 10.0*log10f(((real * real) + (imag * imag)) + 1e-20);</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  destPtr++;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  }</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> </div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> }</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="preprocessor">#endif </span><span class="comment">/* LV_HAVE_SSE3 */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="preprocessor">#ifdef LV_HAVE_GENERIC</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="preprocessor"></span><span class="comment">/*!</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment"> \brief Calculates the log10 power value for each input point</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="comment"> \param logPowerOutput The 10.0 * log10(r*r + i*i) for each data point</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="comment"> \param complexFFTInput The complex data output from the FFT point</span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment"> \param normalizationFactor This value is divided agains all the input values before the power is calculated</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment"> \param num_points The number of fft data points</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="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> volk_32fc_s32f_power_spectrum_32f_a_generic(<span class="keywordtype">float</span>* logPowerOutput, <span class="keyword">const</span> <a class="code" href="volk__complex_8h.html#ace50e1c8ef539cdeee04bc86f0e99169">lv_32fc_t</a>* complexFFTInput, <span class="keyword">const</span> <span class="keywordtype">float</span> normalizationFactor, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> num_points){</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="comment">// Calculate the Power of the complex point</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keyword">const</span> <span class="keywordtype">float</span>* inputPtr = (<span class="keywordtype">float</span>*)complexFFTInput;</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordtype">float</span>* realFFTDataPointsPtr = logPowerOutput;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> iNormalizationFactor = 1.0 / normalizationFactor;</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> point;</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordflow">for</span>(point = 0; point < num_points; point++){</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="comment">// Calculate dBm</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="comment">// 50 ohm load assumption</span></div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="comment">// 10 * log10 (v^2 / (2 * 50.0 * .001)) = 10 * log10( v^2 * 10)</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="comment">// 75 ohm load assumption</span></div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="comment">// 10 * log10 (v^2 / (2 * 75.0 * .001)) = 10 * log10( v^2 * 15)</span></div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> </div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> real = *inputPtr++ * iNormalizationFactor;</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> imag = *inputPtr++ * iNormalizationFactor;</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> </div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  *realFFTDataPointsPtr = 10.0*log10f(((real * real) + (imag * imag)) + 1e-20);</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> </div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> </div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  realFFTDataPointsPtr++;</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  }</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> }</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="preprocessor">#endif </span><span class="comment">/* LV_HAVE_GENERIC */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> </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> </div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="preprocessor">#endif </span><span class="comment">/* INCLUDED_volk_32fc_s32f_power_spectrum_32f_a_H */</span><span class="preprocessor"></span></div>
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