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/* -*- c++ -*- */
/*
* Copyright 2010 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_CONSTELLATION_H
#define INCLUDED_GR_CONSTELLATION_H
#include <vector>
#include <math.h>
#include <gr_complex.h>
#include <boost/enable_shared_from_this.hpp>
#include <gr_metric_type.h>
/************************************************************/
/* gr_constellation */
/* */
/* Decision maker uses nearest-point method. */
/************************************************************/
class gr_constellation;
typedef boost::shared_ptr<gr_constellation> gr_constellation_sptr;
// public constructor
gr_constellation_sptr
gr_make_constellation (std::vector<gr_complex> constellation, std::vector<unsigned int> pre_diff_code);
class gr_constellation : public boost::enable_shared_from_this<gr_constellation>
{
public:
gr_constellation (std::vector<gr_complex> constellation, std::vector<unsigned int> pre_diff_code);
gr_constellation ();
//! Returns the set of points in this constellation.
std::vector<gr_complex> points() { return d_constellation;}
//! Whether to apply an encoding before doing differential encoding. (e.g. gray coding)
bool apply_pre_diff_code() { return d_apply_pre_diff_code;}
//! Returns the encoding to apply before differential encoding.
std::vector<unsigned int> pre_diff_code() { return d_pre_diff_code;}
//! Returns the constellation point that matches best.
//! Also calculates the phase error.
virtual unsigned int decision_maker (gr_complex sample);
//! Calculates metrics for all points in the constellation.
//! For use with the viterbi algorithm.
void calc_metric(gr_complex sample, float *metric, trellis_metric_type_t type);
void calc_euclidean_metric(gr_complex sample, float *metric);
void calc_hard_symbol_metric(gr_complex sample, float *metric);
unsigned int bits_per_symbol () {
return floor(log(d_constellation.size())/log(2));
}
unsigned int arity () {
return d_constellation.size();
}
gr_constellation_sptr base() {
return shared_from_this();
}
protected:
std::vector<gr_complex> d_constellation;
std::vector<unsigned int> d_pre_diff_code;
bool d_apply_pre_diff_code;
private:
friend gr_constellation_sptr
gr_make_constellation (std::vector<gr_complex> constellation);
};
/************************************************************/
/* gr_constellation_sector */
/* */
/* An abstract class. */
/* Constellation space is divided into sectors. */
/* Each sector is associated with the nearest constellation */
/* point. */
/************************************************************/
class gr_constellation_sector : public gr_constellation
{
public:
gr_constellation_sector (std::vector<gr_complex> constellation,
std::vector<unsigned int> pre_diff_code,
unsigned int n_sectors);
unsigned int decision_maker (gr_complex sample);
protected:
virtual unsigned int get_sector (gr_complex sample) = 0;
virtual unsigned int calc_sector_value (unsigned int sector) = 0;
void find_sector_values ();
unsigned int n_sectors;
private:
std::vector<unsigned int> sector_values;
};
/************************************************************/
/* gr_constellation_rect */
/* */
/* Constellation space is divided into rectangular sectors. */
/* Each sector is associated with the nearest constellation */
/* point. */
/* Works well for square QAM. */
/* Works for any generic constellation provided sectors are */
/* not too large. */
/************************************************************/
class gr_constellation_rect;
typedef boost::shared_ptr<gr_constellation_rect> gr_constellation_rect_sptr;
// public constructor
gr_constellation_rect_sptr
gr_make_constellation_rect (std::vector<gr_complex> constellation, std::vector<unsigned int> pre_diff_code,
unsigned int real_sectors, unsigned int imag_sectors,
float width_real_sectors, float width_imag_sectors);
class gr_constellation_rect : public gr_constellation_sector
{
public:
gr_constellation_rect (std::vector<gr_complex> constellation, std::vector<unsigned int> pre_diff_code,
unsigned int real_sectors, unsigned int imag_sectors,
float width_real_sectors, float width_imag_sectors);
protected:
unsigned int get_sector (gr_complex sample);
unsigned int calc_sector_value (unsigned int sector);
private:
unsigned int n_real_sectors;
unsigned int n_imag_sectors;
float d_width_real_sectors;
float d_width_imag_sectors;
friend gr_constellation_rect_sptr
gr_make_constellation_rect (std::vector<gr_complex> constellation, std::vector<unsigned int> pre_diff_code,
unsigned int real_sectors, unsigned int imag_sectors,
float width_real_sectors, float width_imag_sectors);
};
/************************************************************/
/* gr_constellation_psk */
/* */
/* Constellation space is divided into pie slices sectors. */
/* Each slice is associated with the nearest constellation */
/* point. */
/* Works well for PSK but nothing else. */
/* Assumes that there is a constellation point at 1. */
/************************************************************/
class gr_constellation_psk;
typedef boost::shared_ptr<gr_constellation_psk> gr_constellation_psk_sptr;
// public constructor
gr_constellation_psk_sptr
gr_make_constellation_psk (std::vector<gr_complex> constellation, std::vector<unsigned int> pre_diff_code,
unsigned int n_sectors);
class gr_constellation_psk : public gr_constellation_sector
{
public:
gr_constellation_psk (std::vector<gr_complex> constellation, std::vector<unsigned int> pre_diff_code,
unsigned int n_sectors);
protected:
unsigned int get_sector (gr_complex sample);
unsigned int calc_sector_value (unsigned int sector);
private:
friend gr_constellation_psk_sptr
gr_make_constellation_psk (std::vector<gr_complex> constellation, std::vector<unsigned int> pre_diff_code,
unsigned int n_sectors);
};
/************************************************************/
/* gr_constellation_bpsk */
/* */
/* Only works for BPSK. */
/* */
/************************************************************/
class gr_constellation_bpsk;
typedef boost::shared_ptr<gr_constellation_bpsk> gr_constellation_bpsk_sptr;
// public constructor
gr_constellation_bpsk_sptr
gr_make_constellation_bpsk ();
class gr_constellation_bpsk : public gr_constellation
{
public:
gr_constellation_bpsk ();
unsigned int decision_maker (gr_complex sample);
friend gr_constellation_bpsk_sptr
gr_make_constellation_bpsk ();
};
/************************************************************/
/* gr_constellation_qpsk */
/* */
/* Only works for QPSK. */
/* */
/************************************************************/
class gr_constellation_qpsk;
typedef boost::shared_ptr<gr_constellation_qpsk> gr_constellation_qpsk_sptr;
// public constructor
gr_constellation_qpsk_sptr
gr_make_constellation_qpsk ();
class gr_constellation_qpsk : public gr_constellation
{
public:
gr_constellation_qpsk ();
unsigned int decision_maker (gr_complex sample);
friend gr_constellation_qpsk_sptr
gr_make_constellation_qpsk ();
};
#endif
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