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Diffstat (limited to 'gr-digital/lib/digital_constellation_receiver_cb.h')
| -rw-r--r-- | gr-digital/lib/digital_constellation_receiver_cb.h | 114 |
1 files changed, 0 insertions, 114 deletions
diff --git a/gr-digital/lib/digital_constellation_receiver_cb.h b/gr-digital/lib/digital_constellation_receiver_cb.h deleted file mode 100644 index 0ac80450f..000000000 --- a/gr-digital/lib/digital_constellation_receiver_cb.h +++ /dev/null @@ -1,114 +0,0 @@ -/* -*- 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_CONSTELLATION_RECEIVER_CB_H -#define INCLUDED_DIGITAL_CONSTELLATION_RECEIVER_CB_H - -#include <gr_block.h> -#include <digital_constellation.h> -#include <gri_control_loop.h> -#include <gr_complex.h> -#include <math.h> -#include <fstream> - -class digital_constellation_receiver_cb; -typedef boost::shared_ptr<digital_constellation_receiver_cb> digital_constellation_receiver_cb_sptr; - -// public constructor -digital_constellation_receiver_cb_sptr -digital_make_constellation_receiver_cb (digital_constellation_sptr constellation, - float loop_bw, float fmin, float fmax); - -/*! - * \brief This block takes care of receiving generic modulated signals through phase, frequency, and symbol - * synchronization. - * \ingroup sync_blk - * \ingroup demod_blk - * - * This block takes care of receiving generic modulated signals through phase, frequency, and symbol - * synchronization. It performs carrier frequency and phase locking as well as symbol timing recovery. - * - * The phase and frequency synchronization are based on a Costas loop that finds the error of the incoming - * signal point compared to its nearest constellation point. The frequency and phase of the NCO are - * updated according to this error. - * - * The symbol synchronization is done using a modified Mueller and Muller circuit from the paper: - * - * G. R. Danesfahani, T.G. Jeans, "Optimisation of modified Mueller and Muller - * algorithm," Electronics Letters, Vol. 31, no. 13, 22 June 1995, pp. 1032 - 1033. - * - * This circuit interpolates the downconverted sample (using the NCO developed by the Costas loop) - * every mu samples, then it finds the sampling error based on this and the past symbols and the decision - * made on the samples. Like the phase error detector, there are optimized decision algorithms for BPSK - * and QPKS, but 8PSK uses another brute force computation against all possible symbols. The modifications - * to the M&M used here reduce self-noise. - * - */ - -class digital_constellation_receiver_cb : public gr_block, public gri_control_loop -{ -public: - int general_work (int noutput_items, - gr_vector_int &ninput_items, - gr_vector_const_void_star &input_items, - gr_vector_void_star &output_items); - -protected: - - /*! - * \brief Constructor to synchronize incoming M-PSK symbols - * - * \param constellation constellation of points for generic modulation - * \param alpha gain parameter to adjust the phase in the Costas loop (~0.01) - * \param beta gain parameter to adjust the frequency in the Costas loop (~alpha^2/4) - * \param fmin minimum normalized frequency value the loop can achieve - * \param fmax maximum normalized frequency value the loop can achieve - * - * The constructor also chooses which phase detector and decision maker to use in the - * work loop based on the value of M. - */ - digital_constellation_receiver_cb (digital_constellation_sptr constellation, - float loop_bw, float fmin, float fmax); - - void phase_error_tracking(float phase_error); - -private: - unsigned int d_M; - - digital_constellation_sptr d_constellation; - unsigned int d_current_const_point; - - //! delay line length. - static const unsigned int DLLEN = 8; - - //! delay line plus some length for overflow protection - gr_complex d_dl[2*DLLEN] __attribute__ ((aligned(8))); - - //! index to delay line - unsigned int d_dl_idx; - - friend digital_constellation_receiver_cb_sptr - digital_make_constellation_receiver_cb (digital_constellation_sptr constell, - float loop_bw, float fmin, float fmax); -}; - -#endif |