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removing unused code, code cleaning

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This commit is contained in:
Carles Fernandez
2015-05-29 19:10:28 +02:00
parent f243455c18
commit 9d2e22ea21
5 changed files with 66 additions and 344 deletions
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3
src/algorithms/tracking/libs/CMakeLists.txt
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@@ -16,8 +16,7 @@
# along with GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
#
set(TRACKING_LIB_SOURCES
cordic.cc
set(TRACKING_LIB_SOURCES
correlator.cc
lock_detectors.cc
tcp_communication.cc

194
src/algorithms/tracking/libs/cordic.cc
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@@ -1,194 +0,0 @@
/*!
* \file cordic.cc
* \brief Implementation of the CORDIC (COordinate Rotation DIgital Computer) algorithm.
* This implementation is NOT OPTIMIZED, only for demonstration purposes
* \author Carles Fernandez-Prades, 2012. cfernandez(at)cttc.es
*
* This is a modified implementation of the one found at
* http://www.dspguru.com/dsp/faqs/cordic
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2015 (see AUTHORS file for a list of contributors)
*
* GNSS-SDR is a software defined Global Navigation
* Satellite Systems receiver
*
* This file is part of GNSS-SDR.
*
* GNSS-SDR 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 of the License, or
* (at your option) any later version.
*
* GNSS-SDR 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 GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
*
* -------------------------------------------------------------------------
*/
#include <stdlib.h>
//#include <math.h>
#include <cmath>
#include "cordic.h"
const double HALF_PI = 3.1415926535898 / 2;
const int INVALID_K = -1;
Cordic::Cordic(int max_L)
{
double K, dummy;
int L;
//mp_cordic_table = (CORDIC_TABLE *) calloc(max_L + 1, sizeof(CORDIC_TABLE));
mp_cordic_table = (CORDIC_TABLE *) malloc((max_L + 1) * sizeof(CORDIC_TABLE));
if (!mp_cordic_table)
{
/* failed to calloc table */
}
K = 1.0;
for (L = 0; L <= max_L; L++)
{
mp_cordic_table[L].K = K;
mp_cordic_table[L].phase_rads = (double) atan(K);
K *= 0.5;
}
m_max_L = max_L;
/* get m_mag_scale by getting the cordic magnitude with m_mag_scale = 1.0 */
m_mag_scale = 1.0;
Cordic::cordic_get_mag_phase(1.0, 0.0, m_mag_scale, dummy);
m_mag_scale = 1.0 / m_mag_scale;
}
Cordic::~Cordic ()
{
free(mp_cordic_table);
m_max_L = INVALID_K;
}
void Cordic::cordic_get_mag_phase(double I, double Q, double &p_mag, double &p_phase_rads)
{
int L;
double tmp_I, K, phase_rads, acc_phase_rads;
if (I < 0)
{
/* rotate by an initial +/- 90 degrees */
tmp_I = I;
if (Q > 0.0)
{
I = Q; /* subtract 90 degrees */
Q = -tmp_I;
acc_phase_rads = -HALF_PI;
}
else
{
I = -Q; /* add 90 degrees */
Q = tmp_I;
acc_phase_rads = HALF_PI;
}
}
else
{
acc_phase_rads = 0.0;
}
/* rotate using "1 + jK" factors */
for (L = 0; L <= m_max_L; L++)
{
K = mp_cordic_table[L].K;
phase_rads = mp_cordic_table[L].phase_rads;
tmp_I = I;
if (Q >= 0.0)
{
/* phase is positive: do negative rotation */
I += Q * K;
Q -= tmp_I * K;
acc_phase_rads -= phase_rads;
}
else
{
/* phase is negative: do positive rotation */
I -= Q * K;
Q += tmp_I * K;
acc_phase_rads += phase_rads;
}
}
p_phase_rads = -acc_phase_rads;
p_mag = I * m_mag_scale;
}
void Cordic::cordic_get_cos_sin(double desired_phase_rads, double &p_cos, double &p_sin)
{
double I, Q, tmp_I;
double acc_phase_rads, phase_rads, K;
int L;
/* start with +90, -90, or 0 degrees */
if (desired_phase_rads > HALF_PI)
{
I = 0.0;
Q = 1.0;
acc_phase_rads = HALF_PI;
}
else if (desired_phase_rads < -HALF_PI)
{
I = 0.0;
Q = -1.0;
acc_phase_rads = -HALF_PI;
}
else
{
I = 1.0;
Q = 0.0;
acc_phase_rads = 0.0;
}
/* rotate using "1 + jK" factors */
for (L = 0; L <= m_max_L; L++)
{
K = mp_cordic_table[L].K;
phase_rads = mp_cordic_table[L].phase_rads;
tmp_I = I;
if (desired_phase_rads - acc_phase_rads < 0.0)
{
/* do negative rotation */
I += Q * K;
Q -= tmp_I * K;
acc_phase_rads -= phase_rads;
}
else
{
/* do positive rotation */
I -= Q * K;
Q += tmp_I * K;
acc_phase_rads += phase_rads;
}
}
p_cos = I * m_mag_scale;
p_sin = Q * m_mag_scale;
}

80
src/algorithms/tracking/libs/cordic.h
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@@ -1,80 +0,0 @@
/*!
* \file cordic.h
* \brief Interface of the CORDIC (COordinate Rotation DIgital Computer) algorithm.
* \author Carles Fernandez-Prades, 2012. cfernandez(at)cttc.es
*
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2015 (see AUTHORS file for a list of contributors)
*
* GNSS-SDR is a software defined Global Navigation
* Satellite Systems receiver
*
* This file is part of GNSS-SDR.
*
* GNSS-SDR 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 of the License, or
* (at your option) any later version.
*
* GNSS-SDR 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 GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
*
* -------------------------------------------------------------------------
*/
#ifndef GNSS_SDR_CORDIC_H_
#define GNSS_SDR_CORDIC_H_
typedef struct tagCORDIC_TABLE {
double K;
double phase_rads;
} CORDIC_TABLE;
/*!
* \brief Implementation of the CORDIC (COordinate Rotation DIgital Computer) algorithm.
* This implementation is NOT OPTIMIZED, only for demonstration purposes
*/
class Cordic
{
public:
/*!
* \brief construct the CORDIC table which will be of size "largest_k + 1".
*/
Cordic(int largest_k);
/*!
* \brief Frees the CORDIC table's memory
*/
~Cordic();
/*!
* \brief Calculates the magnitude and phase of "I + jQ". p_phase_rads is in radians
*/
void cordic_get_mag_phase(double I, double Q, double &p_mag, double &p_phase_rads);
/* calculate the magnitude and phase of "I + jQ". phase is in radians */
/*!
* \brief Calculates the cosine and sine of the desired phase in radians
*/
void cordic_get_cos_sin(double desired_phase_rads, double &p_cos, double &p_sin);
private:
CORDIC_TABLE *mp_cordic_table;
int m_max_L;
double m_mag_scale;
};
#endif