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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_MPSK_SNR_EST_CC_H
#define INCLUDED_DIGITAL_MPSK_SNR_EST_CC_H
#include <digital/api.h>
#include <digital/mpsk_snr_est.h>
#include <gnuradio/sync_block.h>
namespace gr {
namespace digital {
/*!
* \brief A block for computing SNR of a signal.
* \ingroup measurement_tools_blk
*
* \details
* This block can be used to monitor and retrieve estimations of
* the signal SNR. It is designed to work in a flowgraph and
* passes all incoming data along to its output.
*
* The block is designed for use with M-PSK signals
* especially. The type of estimator is specified as the \p type
* parameter in the constructor. The estimators tend to trade off
* performance for accuracy, although experimentation should be
* done to figure out the right approach for a given
* implementation. Further, the current set of estimators are
* designed and proven theoretically under AWGN conditions; some
* amount of error should be assumed and/or estimated for real
* channel conditions.
*/
class DIGITAL_API mpsk_snr_est_cc : virtual public sync_block
{
public:
// gr::digital::mpsk_snr_est_cc::sptr
typedef boost::shared_ptr<mpsk_snr_est_cc> sptr;
/*! Factory function returning shared pointer of this class
*
* \param type: the type of estimator to use gr::digital::snr_est_type_t
* "snr_est_type_t" for details about the available types
* \param tag_nsamples: after this many samples, a tag containing
* the SNR (key='snr') will be sent
* \param alpha: the update rate of internal running average
* calculations
*/
static sptr make(snr_est_type_t type,
int tag_nsamples=10000,
double alpha=0.001);
//! Return the estimated signal-to-noise ratio in decibels
virtual double snr() = 0;
//! Return the type of estimator in use
virtual snr_est_type_t type() const = 0;
//! Return how many samples between SNR tags
virtual int tag_nsample() const = 0;
//! Get the running-average coefficient
virtual double alpha() const = 0;
//! Set type of estimator to use
virtual void set_type(snr_est_type_t t) = 0;
//! Set the number of samples between SNR tags
virtual void set_tag_nsample(int n) = 0;
//! Set the running-average coefficient
virtual void set_alpha(double alpha) = 0;
};
} /* namespace digital */
} /* namespace gr */
#endif /* INCLUDED_DIGITAL_MPSK_SNR_EST_CC_H */
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