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/* -*- c++ -*- */
/*
* Copyright 2011 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_IMPL_MPSK_SNR_EST_H
#define INCLUDED_DIGITAL_IMPL_MPSK_SNR_EST_H
#include <digital_api.h>
#include <gr_sync_block.h>
enum snr_est_type_t {
SNR_EST_SIMPLE = 0, // Simple estimator (>= 7 dB)
SNR_EST_SKEW, // Skewness-base est (>= 5 dB)
SNR_EST_M2M4, // 2nd & 4th moment est (>= 1 dB)
SNR_EST_SVN // SVN-based est (>= 0dB)
};
/*!
* Parent class for SNR Estimators
*/
class DIGITAL_API digital_impl_mpsk_snr_est
{
protected:
double d_alpha, d_beta;
public:
digital_impl_mpsk_snr_est(double alpha);
virtual ~digital_impl_mpsk_snr_est();
//! Get the running-average coefficient
double alpha() const;
//! Set the running-average coefficient
void set_alpha(double alpha);
//! Update the current registers
virtual int update(int noutput_items,
gr_vector_const_void_star &input_items);
//! Use the register values to compute a new estimate
virtual double snr();
};
class DIGITAL_API digital_impl_mpsk_snr_est_simple :
public digital_impl_mpsk_snr_est
{
private:
double d_y1, d_y2;
public:
digital_impl_mpsk_snr_est_simple(double alpha);
~digital_impl_mpsk_snr_est_simple() {}
int update(int noutput_items,
gr_vector_const_void_star &input_items);
double snr();
};
class DIGITAL_API digital_impl_mpsk_snr_est_skew :
public digital_impl_mpsk_snr_est
{
private:
double d_y1, d_y2, d_y3;
public:
digital_impl_mpsk_snr_est_skew(double alpha);
~digital_impl_mpsk_snr_est_skew() {}
int update(int noutput_items,
gr_vector_const_void_star &input_items);
double snr();
};
class DIGITAL_API digital_impl_mpsk_snr_est_m2m4 :
public digital_impl_mpsk_snr_est
{
private:
double d_y1, d_y2;
public:
digital_impl_mpsk_snr_est_m2m4(double alpha);
~digital_impl_mpsk_snr_est_m2m4() {}
int update(int noutput_items,
gr_vector_const_void_star &input_items);
double snr();
};
class DIGITAL_API digital_impl_mpsk_snr_est_svn :
public digital_impl_mpsk_snr_est
{
private:
double d_y1, d_y2;
public:
digital_impl_mpsk_snr_est_svn(double alpha);
~digital_impl_mpsk_snr_est_svn() {}
int update(int noutput_items,
gr_vector_const_void_star &input_items);
double snr();
};
#endif /* INCLUDED_DIGITAL_IMPL_MPSK_SNR_EST_H */
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