kurtotic_equalizer_cc.h

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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_KURTOTIC_EQUALIZER_CC_H
#define INCLUDED_DIGITAL_KURTOTIC_EQUALIZER_CC_H

#include <gnuradio/digital/api.h>
#include <gnuradio/sync_decimator.h>

namespace gr {
namespace digital {

/*!
 * \brief Implements a kurtosis-based adaptive equalizer on complex stream
 * \ingroup equalizers_blk
 *
 * \details
 * Warning: This block does not yet work.
 *
 * "Y. Guo, J. Zhao, Y. Sun, "Sign kurtosis maximization based blind
 * equalization algorithm," IEEE Conf. on Control, Automation,
 * Robotics and Vision, Vol. 3, Dec. 2004, pp. 2052 - 2057."
 */
class DIGITAL_API kurtotic_equalizer_cc : virtual public sync_decimator
{
protected:
    virtual gr_complex error(const gr_complex& out) = 0;
    virtual void update_tap(gr_complex& tap, const gr_complex& in) = 0;

public:
    // gr::digital::kurtotic_equalizer_cc::sptr
    typedef boost::shared_ptr<kurtotic_equalizer_cc> sptr;

    static sptr make(int num_taps, float mu);

    virtual float gain() const = 0;
    virtual void set_gain(float mu) = 0;
};

} /* namespace digital */
} /* namespace gr */

#endif /* INCLUDED_DIGITAL_KURTOTIC_EQUALIZER_CC_H */