pn_correlator_cc.h

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/* -*- c++ -*- */
/*
 * Copyright 2007,2012 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_GR_PN_CORRELATOR_CC_H
#define INCLUDED_GR_PN_CORRELATOR_CC_H

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

namespace gr {
namespace digital {

/*!
 * \brief PN code sequential search correlator
 * \ingroup synchronizers_blk
 *
 * \details
 * Receives complex baseband signal, outputs complex correlation
 * against reference PN code, one sample per PN code period. The
 * PN sequence is generated using a GLFSR.
 */
class DIGITAL_API pn_correlator_cc : virtual public sync_decimator
{
public:
    // gr::digital::pn_correlator_cc::sptr
    typedef boost::shared_ptr<pn_correlator_cc> sptr;

    /*!
     * \brief Make PN code sequential search correlator block.
     *
     * \param degree Degree of shift register must be in [1, 32]. If mask
     *               is 0, the degree determines a default mask (see
     *               digital_impl_glfsr.cc for the mapping).
     * \param mask   Allows a user-defined bit mask for indexes of the shift
     *               register to feed back.
     * \param seed   Initial setting for values in shift register.
     */
    static sptr make(int degree, int mask = 0, int seed = 1);
};

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

#endif /* INCLUDED_GR_PN_CORRELATOR_CC_H */