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/* -*- c++ -*- */
/*
* Copyright 2011,2012 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "lms_dd_equalizer_cc_impl.h"
#include <gr_io_signature.h>
#include <gr_misc.h>
#include <volk/volk.h>
namespace gr {
namespace digital {
lms_dd_equalizer_cc::sptr
lms_dd_equalizer_cc::make(int num_taps, float mu, int sps,
constellation_sptr cnst)
{
return gnuradio::get_initial_sptr
(new lms_dd_equalizer_cc_impl(num_taps, mu, sps, cnst));
}
lms_dd_equalizer_cc_impl::lms_dd_equalizer_cc_impl(int num_taps, float mu,
int sps,
constellation_sptr cnst)
: gr_sync_decimator("lms_dd_equalizer_cc",
gr_make_io_signature(1, 1, sizeof(gr_complex)),
gr_make_io_signature(1, 1, sizeof(gr_complex)),
sps),
filter::kernel::fir_filter_ccc(sps, std::vector<gr_complex>(num_taps, gr_complex(0,0))),
d_cnst(cnst)
{
set_gain(mu);
if(num_taps > 0)
d_taps[0] = 1.0;
set_taps(d_taps);
const int alignment_multiple =
volk_get_alignment() / sizeof(gr_complex);
set_alignment(std::max(1,alignment_multiple));
set_history(num_taps+1);
}
lms_dd_equalizer_cc_impl::~lms_dd_equalizer_cc_impl()
{
}
int
lms_dd_equalizer_cc_impl::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 j = 0;
size_t l = d_taps.size();
for(int i = 0; i < noutput_items; i++) {
out[i] = filter(&in[j]);
d_error = error(out[i]);
for(size_t k=0; k < l; k++) {
update_tap(d_taps[k], in[i+k]);
}
j += decimation();
}
return noutput_items;
}
} /* namespace digital */
} /* namespace gr */
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