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-/* -*- c++ -*- */
-/*
- * Copyright 2006,2011 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_COSTAS_LOOP_CC_H
-#define INCLUDED_DIGITAL_COSTAS_LOOP_CC_H
-
-#include <gr_sync_block.h>
-#include <gri_control_loop.h>
-#include <stdexcept>
-#include <fstream>
-
-
-/*!
- * \brief A Costas loop carrier recovery module.
- * \ingroup sync_blk
- * \ingroup digital
- *
- * The Costas loop locks to the center frequency of a signal and
- * downconverts it to baseband. The second (order=2) order loop is
- * used for BPSK where the real part of the output signal is the
- * baseband BPSK signal and the imaginary part is the error
- * signal. When order=4, it can be used for quadrature modulations
- * where both I and Q (real and imaginary) are outputted.
- *
- * More details can be found online:
- *
- * J. Feigin, "Practical Costas loop design: Designing a simple and
- * inexpensive BPSK Costas loop carrier recovery circuit," RF signal
- * processing, pp. 20-36, 2002.
- *
- * http://rfdesign.com/images/archive/0102Feigin20.pdf
- *
- * \param loop_bw internal 2nd order loop bandwidth (~ 2pi/100)
- * \param order the loop order, either 2, 4, or 8
- */
-
-#include <digital_api.h>
-
-class digital_costas_loop_cc;
-typedef boost::shared_ptr<digital_costas_loop_cc> digital_costas_loop_cc_sptr;
-
-
-DIGITAL_API digital_costas_loop_cc_sptr
-digital_make_costas_loop_cc (float loop_bw, int order
- ) throw (std::invalid_argument);
-
-
-/*!
- * \brief Carrier tracking PLL for QPSK
- * \ingroup sync_blk
- * input: complex; output: complex
- * <br>The Costas loop can have two output streams:
- * stream 1 is the baseband I and Q;
- * stream 2 is the normalized frequency of the loop
- *
- * \p order must be 2, 4, or 8.
- */
-class DIGITAL_API digital_costas_loop_cc : public gr_sync_block, public gri_control_loop
-{
- friend DIGITAL_API digital_costas_loop_cc_sptr
- digital_make_costas_loop_cc (float loop_bw, int order
- ) throw (std::invalid_argument);
-
- int d_order;
-
- digital_costas_loop_cc (float loop_bw, int order
- ) throw (std::invalid_argument);
-
- /*! \brief the phase detector circuit for 8th-order PSK loops
- * \param sample complex sample
- * \return the phase error
- */
- float phase_detector_8(gr_complex sample) const; // for 8PSK
-
- /*! \brief the phase detector circuit for fourth-order loops
- * \param sample complex sample
- * \return the phase error
- */
- float phase_detector_4(gr_complex sample) const; // for QPSK
-
- /*! \brief the phase detector circuit for second-order loops
- * \param sample a complex sample
- * \return the phase error
- */
- float phase_detector_2(gr_complex sample) const; // for BPSK
-
-
- float (digital_costas_loop_cc::*d_phase_detector)(gr_complex sample) const;
-
-public:
-
- int work (int noutput_items,
- gr_vector_const_void_star &input_items,
- gr_vector_void_star &output_items);
-};
-
-#endif