howto_interp_gscrambler_cc.cc

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「howto_interp_gscrambler_cc.cc」(2011/06/18 (土) 02:54:36) の最新版変更点

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 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
 #include <howto_interp_gscrambler_cc.h>
 #include <gr_io_signature.h>
 #include <stdexcept>
 #include <iostream>
 
 howto_interp_gscrambler_cc_sptr howto_make_interp_gscrambler_cc (unsigned interpolation, int degree, int mask, int seed)
 {
   return howto_interp_gscrambler_cc_sptr (new howto_interp_gscrambler_cc (interpolation, degree, mask, seed));
 }
 
 
 howto_interp_gscrambler_cc::howto_interp_gscrambler_cc (unsigned interpolation, int degree, int mask, int seed)
   : gr_sync_interpolator ("interp_fir_filter_ccf",
 			  gr_make_io_signature (1, 1, sizeof (gr_complex)),
 			  gr_make_io_signature (1, 1, sizeof (gr_complex)),
 			  interpolation)
 {
   if (interpolation == 0)
     throw std::out_of_range ("interpolation must be > 0");
   d_len = (unsigned int)((1ULL << degree)-1);
   if (mask == 0)
     mask = gri_glfsr::glfsr_mask(degree);
   d_reference = new gri_glfsr(mask, seed);
 }
 
 
 howto_interp_gscrambler_cc::~howto_interp_gscrambler_cc ()
 {
   delete d_reference;
 }
 
 int howto_interp_gscrambler_cc::work (int noutput_items,
		   gr_vector_const_void_star &input_items,
		   gr_vector_void_star &output_items)
 {
   const gr_complex *in = (const gr_complex *) input_items[0];
   gr_complex *out = (gr_complex *) output_items[0];
   int ntaps = interpolation (); // as same as d_len
   int ni = noutput_items / interpolation ();
   for (int i = 0; i < ni; i++){
     for (int nt = 0; nt < ntaps; nt++){
     	d_pn = 2.0*d_reference->next_bit()-1.0; // no conditionals
     	*out++ = *in * d_pn;
     }
     in++;
   }
 
   return noutput_items;
 }
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