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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 "probe_mpsk_snr_est_c_impl.h"
#include <gnuradio/io_signature.h>
#include <cstdio>
namespace gr {
namespace digital {
probe_mpsk_snr_est_c::sptr
probe_mpsk_snr_est_c::make(snr_est_type_t type, int msg_nsamples, double alpha)
{
return gnuradio::get_initial_sptr(
new probe_mpsk_snr_est_c_impl(type, msg_nsamples, alpha));
}
probe_mpsk_snr_est_c_impl::probe_mpsk_snr_est_c_impl(snr_est_type_t type,
int msg_nsamples,
double alpha)
: sync_block("probe_mpsk_snr_est_c",
io_signature::make(1, 1, sizeof(gr_complex)),
io_signature::make(0, 0, 0))
{
d_snr_est = NULL;
d_type = type;
d_nsamples = msg_nsamples;
d_count = 0;
set_alpha(alpha);
set_type(type);
// at least 1 estimator has to look back
set_history(2);
d_snr_port = pmt::string_to_symbol("snr");
d_signal_port = pmt::string_to_symbol("signal");
d_noise_port = pmt::string_to_symbol("noise");
message_port_register_out(d_snr_port);
message_port_register_out(d_signal_port);
message_port_register_out(d_noise_port);
}
probe_mpsk_snr_est_c_impl::~probe_mpsk_snr_est_c_impl()
{
if (d_snr_est)
delete d_snr_est;
}
int probe_mpsk_snr_est_c_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];
int n = d_snr_est->update(noutput_items, in);
d_count += noutput_items;
while (d_count > d_nsamples) {
// Post a message with the latest SNR data
message_port_pub(d_snr_port, pmt::from_double(snr()));
message_port_pub(d_signal_port, pmt::from_double(signal()));
message_port_pub(d_noise_port, pmt::from_double(noise()));
d_count -= d_nsamples;
}
return n;
}
double probe_mpsk_snr_est_c_impl::snr()
{
if (d_snr_est)
return d_snr_est->snr();
else
throw std::runtime_error(
"probe_mpsk_snr_est_c_impl:: No SNR estimator defined.");
}
double probe_mpsk_snr_est_c_impl::signal()
{
if (d_snr_est)
return d_snr_est->signal();
else
throw std::runtime_error(
"probe_mpsk_snr_est_c_impl:: No SNR estimator defined.");
}
double probe_mpsk_snr_est_c_impl::noise()
{
if (d_snr_est)
return d_snr_est->noise();
else
throw std::runtime_error(
"probe_mpsk_snr_est_c_impl:: No SNR estimator defined.");
}
snr_est_type_t probe_mpsk_snr_est_c_impl::type() const { return d_type; }
int probe_mpsk_snr_est_c_impl::msg_nsample() const { return d_nsamples; }
double probe_mpsk_snr_est_c_impl::alpha() const { return d_alpha; }
void probe_mpsk_snr_est_c_impl::set_type(snr_est_type_t t)
{
d_type = t;
if (d_snr_est)
delete d_snr_est;
switch (d_type) {
case (SNR_EST_SIMPLE):
d_snr_est = new mpsk_snr_est_simple(d_alpha);
break;
case (SNR_EST_SKEW):
d_snr_est = new mpsk_snr_est_skew(d_alpha);
break;
case (SNR_EST_M2M4):
d_snr_est = new mpsk_snr_est_m2m4(d_alpha);
break;
case (SNR_EST_SVR):
d_snr_est = new mpsk_snr_est_svr(d_alpha);
break;
default:
throw std::invalid_argument(
"probe_mpsk_snr_est_c_impl: unknown type specified.");
}
}
void probe_mpsk_snr_est_c_impl::set_msg_nsample(int n)
{
if (n > 0) {
d_nsamples = n;
d_count = 0; // reset state
} else
throw std::invalid_argument(
"probe_mpsk_snr_est_c_impl: msg_nsamples can't be <= 0");
}
void probe_mpsk_snr_est_c_impl::set_alpha(double alpha)
{
if ((alpha >= 0) && (alpha <= 1.0)) {
d_alpha = alpha;
if (d_snr_est)
d_snr_est->set_alpha(d_alpha);
} else
throw std::invalid_argument(
"probe_mpsk_snr_est_c_impl: alpha must be in [0,1]");
}
} /* namespace digital */
} /* namespace gr */
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