combiner.c.htm

is about alamouti channel estimation

</span><span class="line">   29 </span><span class="sym">}
</span><span class="line">   30 </span><span class="sym">
</span><span class="line">   31 </span><span class="sym">
</span><span class="line">   32 </span><span class="sym"></span><span class="kwb">void</span> combine_fix8<span class="sym">(</span>fix8_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> fix8_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">   33 </span><span class="sym"></span>            fix8_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> fix8_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">   34 </span><span class="sym"></span>            fix8_t symb_re<span class="sym">[</span><span class="num">2</span><span class="sym">],</span> fix8_t symb_im<span class="sym">[</span><span class="num">2</span><span class="sym">] )
</span><span class="line">   35 </span><span class="sym">{
</span><span class="line">   36 </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">   37 </span><span class="sym">
</span><span class="line">   38 </span><span class="sym"></span>    temp_re_0 <span class="sym">=</span> fix8_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> fix8_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">   39 </span><span class="sym"></span>            fix8_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> fix8_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">   40 </span><span class="sym"></span>            fix8_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> fix8_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">   41 </span><span class="sym"></span>            fix8_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> fix8_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">   42 </span><span class="sym">
</span><span class="line">   43 </span><span class="sym">
</span><span class="line">   44 </span><span class="sym"></span>    temp_im_0 <span class="sym">=</span> fix8_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">0</span><span class="sym">]) -</span> fix8_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">0</span><span class="sym">])-
</span><span class="line">   45 </span><span class="sym"></span>            fix8_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">1</span><span class="sym">]) +</span> fix8_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">1</span><span class="sym">]) +
</span><span class="line">   46 </span><span class="sym"></span>            fix8_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">0</span><span class="sym">]) -</span> fix8_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">0</span><span class="sym">]) -
</span><span class="line">   47 </span><span class="sym"></span>            fix8_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">1</span><span class="sym">]) +</span> fix8_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">1</span><span class="sym">]) ;
</span><span class="line">   48 </span><span class="sym">
</span><span class="line">   49 </span><span class="sym"></span>    temp_re_1 <span class="sym">=</span> fix8_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> fix8_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">   50 </span><span class="sym"></span>            fix8_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> fix8_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">   51 </span><span class="sym"></span>            fix8_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> fix8_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">   52 </span><span class="sym"></span>            fix8_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> fix8_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">   53 </span><span class="sym">
</span><span class="line">   54 </span><span class="sym"></span>    temp_im_1 <span class="sym">=</span> fix8_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> fix8_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">   55 </span><span class="sym"></span>            fix8_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> fix8_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">   56 </span><span class="sym"></span>            fix8_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> fix8_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">   57 </span><span class="sym"></span>            fix8_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> fix8_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">   58 </span><span class="sym">
</span><span class="line">   59 </span><span class="sym"></span>    symb_re<span class="sym">[</span><span class="num">0</span><span class="sym">] = (</span>fix8_t<span class="sym">)</span> temp_re_0<span class="sym">;
</span><span class="line">   60 </span><span class="sym"></span>    symb_re<span class="sym">[</span><span class="num">1</span><span class="sym">] = (</span>fix8_t<span class="sym">)</span> temp_re_1<span class="sym">;
</span><span class="line">   61 </span><span class="sym"></span>    symb_im<span class="sym">[</span><span class="num">0</span><span class="sym">] = (</span>fix8_t<span class="sym">)</span> temp_im_0<span class="sym">;
</span><span class="line">   62 </span><span class="sym"></span>    symb_im<span class="sym">[</span><span class="num">1</span><span class="sym">] = (</span>fix8_t<span class="sym">)</span> temp_im_1<span class="sym">;
</span><span class="line">   63 </span><span class="sym">
</span><span class="line">   64 </span><span class="sym"></span>    <span class="kwa">return</span><span class="sym">;