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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.
*/
#ifndef INCLUDED_DIGITAL_LMS_DD_EQUALIZER_CC_IMPL_H
#define INCLUDED_DIGITAL_LMS_DD_EQUALIZER_CC_IMPL_H
#include <digital/lms_dd_equalizer_cc.h>
#include <filter/fir_filter.h>
#include <stdexcept>
namespace gr {
namespace digital {
class lms_dd_equalizer_cc_impl
: public lms_dd_equalizer_cc, filter::kernel::fir_filter_ccc
{
private:
std::vector<gr_complex> d_new_taps;
bool d_updated;
gr_complex d_error;
float d_mu;
constellation_sptr d_cnst;
protected:
gr_complex error(const gr_complex &out)
{
gr_complex decision, error;
d_cnst->map_to_points(d_cnst->decision_maker(&out), &decision);
error = decision - out;
return error;
}
void update_tap(gr_complex &tap, const gr_complex &in)
{
tap += d_mu*conj(in)*d_error;
}
public:
lms_dd_equalizer_cc_impl(int num_taps,
float mu, int sps,
constellation_sptr cnst);
~lms_dd_equalizer_cc_impl();
float gain() const
{
return d_mu;
}
void set_gain(float mu)
{
if(mu < 0.0f || mu > 1.0f) {
throw std::out_of_range("lms_dd_equalizer_impl::set_mu: Gain value must in [0, 1]");
}
else {
d_mu = mu;
}
}
int work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items);
};
} /* namespace digital */
} /* namespace gr */
#endif /* INCLUDED_DIGITAL_LMS_DD_EQUALIZER_CC_IMPL_H */
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