combiner.c.htm

is about alamouti channel estimation

</span><span class="line">  101 </span><span class="sym">}
</span><span class="line">  102 </span><span class="sym">
</span><span class="line">  103 </span><span class="sym"></span><span class="kwb">void</span> combine_fix16<span class="sym">(</span>fix16_t recv_re<span class="sym">[</span><span class="num">2</span><span class="sym">][</span><span class="num">2</span><span class="sym">],</span> fix16_t recv_im<span class="sym">[</span><span class="num">2</span><span class="sym">][</span><span class="num">2</span><span class="sym">],
</span><span class="line">  104 </span><span class="sym"></span>            fix16_t h_re<span class="sym">[</span><span class="num">2</span><span class="sym">][</span><span class="num">2</span><span class="sym">],</span> fix16_t h_im<span class="sym">[</span><span class="num">2</span><span class="sym">][</span><span class="num">2</span><span class="sym">],
</span><span class="line">  105 </span><span class="sym"></span>            fix16_t symb_re<span class="sym">[</span><span class="num">2</span><span class="sym">],</span> fix16_t symb_im<span class="sym">[</span><span class="num">2</span><span class="sym">] )
</span><span class="line">  106 </span><span class="sym">{
</span><span class="line">  107 </span><span class="sym"></span>    <span class="kwb">long int</span> temp_re_0<span class="sym">,</span> temp_re_1<span class="sym">,</span> temp_im_0<span class="sym">,</span> temp_im_1<span class="sym">;
</span><span class="line">  108 </span><span class="sym">
</span><span class="line">  109 </span><span class="sym"></span>    temp_re_0 <span class="sym">=</span> fix16_mult<span class="sym">(</span>h_re<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">0</span><span class="sym">],</span>recv_re<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">0</span><span class="sym">]) +</span> fix16_mult<span class="sym">(</span>h_im<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">0</span><span class="sym">],</span>recv_im<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">0</span><span class="sym">]) +
</span><span class="line">  110 </span><span class="sym"></span>            fix16_mult<span class="sym">(</span>h_re<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">1</span><span class="sym">],</span>recv_re<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">1</span><span class="sym">]) +</span> fix16_mult<span class="sym">(</span>h_im<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">1</span><span class="sym">],</span>recv_im<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">1</span><span class="sym">]) +
</span><span class="line">  111 </span><span class="sym"></span>            fix16_mult<span class="sym">(</span>h_re<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">0</span><span class="sym">],</span>recv_re<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">0</span><span class="sym">]) +</span> fix16_mult<span class="sym">(</span>h_im<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">0</span><span class="sym">],</span>recv_im<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">0</span><span class="sym">]) +
</span><span class="line">  112 </span><span class="sym"></span>            fix16_mult<span class="sym">(</span>h_re<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">1</span><span class="sym">],</span>recv_re<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">1</span><span class="sym">]) +</span> fix16_mult<span class="sym">(</span>h_im<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">1</span><span class="sym">],</span>recv_im<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">1</span><span class="sym">]) ;
</span><span class="line">  113 </span><span class="sym">
</span><span class="line">  114 </span><span class="sym"></span>    temp_re_1 <span class="sym">=</span> fix16_mult<span class="sym">(</span>h_re<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">1</span><span class="sym">],</span>recv_re<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">0</span><span class="sym">]) +</span> fix16_mult<span class="sym">(</span>h_im<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">1</span><span class="sym">],</span>recv_im<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">0</span><span class="sym">]) -
</span><span class="line">  115 </span><span class="sym"></span>            fix16_mult<span class="sym">(</span>h_re<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">0</span><span class="sym">],</span>recv_re<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">1</span><span class="sym">]) -</span> fix16_mult<span class="sym">(</span>h_im<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">0</span><span class="sym">],</span>recv_im<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">1</span><span class="sym">]) +
</span><span class="line">  116 </span><span class="sym"></span>            fix16_mult<span class="sym">(</span>h_re<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">1</span><span class="sym">],</span>recv_re<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">0</span><span class="sym">]) +</span> fix16_mult<span class="sym">(</span>h_im<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">1</span><span class="sym">],</span>recv_im<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">0</span><span class="sym">]) -
</span><span class="line">  117 </span><span class="sym"></span>            fix16_mult<span class="sym">(</span>h_re<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">0</span><span class="sym">],</span>recv_re<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">1</span><span class="sym">]) -</span> fix16_mult<span class="sym">(</span>h_im<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">0</span><span class="sym">],</span>recv_im<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">1</span><span class="sym">]) ;
</span><span class="line">  118 </span><span class="sym">
</span><span class="line">  119 </span><span class="sym"></span>    temp_im_1 <span class="sym">=</span> fix16_mult<span class="sym">(</span>h_re<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">1</span><span class="sym">],</span>recv_im<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">0</span><span class="sym">]) -</span> fix16_mult<span class="sym">(</span>h_im<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">1</span><span class="sym">],</span>recv_re<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">0</span><span class="sym">]) +
</span><span class="line">  120 </span><span class="sym"></span>            fix16_mult<span class="sym">(</span>h_re<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">0</span><span class="sym">],</span>recv_im<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">1</span><span class="sym">]) -</span> fix16_mult<span class="sym">(</span>h_im<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">0</span><span class="sym">],</span>recv_re<span class="sym">[</span><span class="num">0</span><span class="sym">][</span><span class="num">1</span><span class="sym">]) +
</span><span class="line">  121 </span><span class="sym"></span>            fix16_mult<span class="sym">(</span>h_re<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">1</span><span class="sym">],</span>recv_im<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">0</span><span class="sym">]) -</span> fix16_mult<span class="sym">(</span>h_im<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">1</span><span class="sym">],</span>recv_re<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">0</span><span class="sym">]) +
</span><span class="line">  122 </span><span class="sym"></span>            fix16_mult<span class="sym">(</span>h_re<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">0</span><span class="sym">],</span>recv_im<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">1</span><span class="sym">]) -</span> fix16_mult<span class="sym">(</span>h_im<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">0</span><span class="sym">],</span>recv_re<span class="sym">[</span><span class="num">1</span><span class="sym">][</span><span class="num">1</span><span class="sym">]) ;
</span><span class="line">  123 </span><span class="sym">
</span><span class="line">  124 </span><span class="sym"></span>    symb_re<span class="sym">[</span><span class="num">0</span><span class="sym">] = (</span>fix16_t<span class="sym">)</span> temp_re_0<span class="sym">;
</span><span class="line">  125 </span><span class="sym"></span>    symb_re<span class="sym">[</span><span class="num">1</span><span class="sym">] = (</span>fix16_t<span class="sym">)</span> temp_re_1<span class="sym">;
</span><span class="line">  126 </span><span class="sym"></span>    symb_im<span class="sym">[</span><span class="num">0</span><span class="sym">] = (</span>fix16_t<span class="sym">)</span> temp_im_0<span class="sym">;
</span><span class="line">  127 </span><span class="sym"></span>    symb_im<span class="sym">[</span><span class="num">1</span><span class="sym">] = (</span>fix16_t<span class="sym">)</span> temp_im_1<span class="sym">;
</span><span class="line">  128 </span><span class="sym">
</span><span class="line">  129 </span><span class="sym"></span>    <span class="kwa">return</span><span class="sym">;
</span><span class="line">  130 </span><span class="sym">}</span>
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