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sdrangel/plugins/channeltx/moddatv/dvb-s2/dvbs2_modulator.cpp

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///////////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2021 Jon Beniston, M7RCE <jon@beniston.com> //
// //
// This program 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 as version 3 of the License, or //
// (at your option) any later version. //
// //
// This program 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 V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////////
#include "math.h"
#include "DVBS2.h"
#define CP 0x7FFF
void DVBS2::modulator_configuration()
{
double r0,r1,r2,r3;
double m = 1.0;
if (m_format[0].constellation == M_32APSK)
r0 = 0.9*m;// I am not sure why this needs to be 0.9 but 32APSK does not work if == 1.0
else
r0 = 1.0*m;// Don't use 0.9 for other mods, as that results in worse MER
r1 = m;
// BPSK
m_bpsk[0][0].re = (short)((r0*cos(1*M_PI/4.0))*CP);
m_bpsk[0][0].im = (short)((r0*sin(1*M_PI/4.0))*CP);
m_bpsk[0][1].re = (short)((r0*cos(5*M_PI/4.0))*CP);
m_bpsk[0][1].im = (short)((r0*sin(5*M_PI/4.0))*CP);
m_bpsk[1][0].re = (short)((r0*cos(3*M_PI/4.0))*CP);
m_bpsk[1][0].im = (short)((r0*sin(3*M_PI/4.0))*CP);
m_bpsk[1][1].re = (short)((r0*cos(7*M_PI/4.0))*CP);
m_bpsk[1][1].im = (short)((r0*sin(7*M_PI/4.0))*CP);
// QPSK
m_qpsk[0].re = (short)((r1*cos(M_PI/4.0))*CP);
m_qpsk[0].im = (short)((r1*sin(M_PI/4.0))*CP);
m_qpsk[1].re = (short)((r1*cos(7*M_PI/4.0))*CP);
m_qpsk[1].im = (short)((r1*sin(7*M_PI/4.0))*CP);
m_qpsk[2].re = (short)((r1*cos(3*M_PI/4.0))*CP);
m_qpsk[2].im = (short)((r1*sin(3*M_PI/4.0))*CP);
m_qpsk[3].re = (short)((r1*cos(5*M_PI/4.0))*CP);
m_qpsk[3].im = (short)((r1*sin(5*M_PI/4.0))*CP);
// 8PSK
m_8psk[0].re = (short)((r1*cos(M_PI/4.0))*CP);
m_8psk[0].im = (short)((r1*sin(M_PI/4.0))*CP);
m_8psk[1].re = (short)((r1*cos(0.0))*CP);
m_8psk[1].im = (short)((r1*sin(0.0))*CP);
m_8psk[2].re = (short)((r1*cos(4*M_PI/4.0))*CP);
m_8psk[2].im = (short)((r1*sin(4*M_PI/4.0))*CP);
m_8psk[3].re = (short)((r1*cos(5*M_PI/4.0))*CP);
m_8psk[3].im = (short)((r1*sin(5*M_PI/4.0))*CP);
m_8psk[4].re = (short)((r1*cos(2*M_PI/4.0))*CP);
m_8psk[4].im = (short)((r1*sin(2*M_PI/4.0))*CP);
m_8psk[5].re = (short)((r1*cos(7*M_PI/4.0))*CP);
m_8psk[5].im = (short)((r1*sin(7*M_PI/4.0))*CP);
m_8psk[6].re = (short)((r1*cos(3*M_PI/4.0))*CP);
m_8psk[6].im = (short)((r1*sin(3*M_PI/4.0))*CP);
m_8psk[7].re = (short)((r1*cos(6*M_PI/4.0))*CP);
m_8psk[7].im = (short)((r1*sin(6*M_PI/4.0))*CP);
// 16 APSK
r2 = m;
switch( m_format[0].code_rate )
{
case CR_2_3:
r1 = r2/3.15;
break;
case CR_3_4:
r1 = r2/2.85;
break;
case CR_4_5:
r1 = r2/2.75;
break;
case CR_5_6:
r1 = r2/2.70;
break;
case CR_8_9:
r1 = r2/2.60;
break;
case CR_9_10:
r1 = r2/2.57;
break;
default:
// Illegal
r1 = 0;
break;
}
m_16apsk[0].re = (short)((r2*cos(M_PI/4.0))*CP);
m_16apsk[0].im = (short)((r2*sin(M_PI/4.0))*CP);
m_16apsk[1].re = (short)((r2*cos(-M_PI/4.0))*CP);
m_16apsk[1].im = (short)((r2*sin(-M_PI/4.0))*CP);
m_16apsk[2].re = (short)((r2*cos(3*M_PI/4.0))*CP);
m_16apsk[2].im = (short)((r2*sin(3*M_PI/4.0))*CP);
m_16apsk[3].re = (short)((r2*cos(-3*M_PI/4.0))*CP);
m_16apsk[3].im = (short)((r2*sin(-3*M_PI/4.0))*CP);
m_16apsk[4].re = (short)((r2*cos(M_PI/12.0))*CP);
m_16apsk[4].im = (short)((r2*sin(M_PI/12.0))*CP);
m_16apsk[5].re = (short)((r2*cos(-M_PI/12.0))*CP);
m_16apsk[5].im = (short)((r2*sin(-M_PI/12.0))*CP);
m_16apsk[6].re = (short)((r2*cos(11*M_PI/12.0))*CP);
m_16apsk[6].im = (short)((r2*sin(11*M_PI/12.0))*CP);
m_16apsk[7].re = (short)((r2*cos(-11*M_PI/12.0))*CP);
m_16apsk[7].im = (short)((r2*sin(-11*M_PI/12.0))*CP);
m_16apsk[8].re = (short)((r2*cos(5*M_PI/12.0))*CP);
m_16apsk[8].im = (short)((r2*sin(5*M_PI/12.0))*CP);
m_16apsk[9].re = (short)((r2*cos(-5*M_PI/12.0))*CP);
m_16apsk[9].im = (short)((r2*sin(-5*M_PI/12.0))*CP);
m_16apsk[10].re = (short)((r2*cos(7*M_PI/12.0))*CP);
m_16apsk[10].im = (short)((r2*sin(7*M_PI/12.0))*CP);
m_16apsk[11].re = (short)((r2*cos(-7*M_PI/12.0))*CP);
m_16apsk[11].im = (short)((r2*sin(-7*M_PI/12.0))*CP);
m_16apsk[12].re = (short)((r1*cos(M_PI/4.0))*CP);
m_16apsk[12].im = (short)((r1*sin(M_PI/4.0))*CP);
m_16apsk[13].re = (short)((r1*cos(-M_PI/4.0))*CP);
m_16apsk[13].im = (short)((r1*sin(-M_PI/4.0))*CP);
m_16apsk[14].re = (short)((r1*cos(3*M_PI/4.0))*CP);
m_16apsk[14].im = (short)((r1*sin(3*M_PI/4.0))*CP);
m_16apsk[15].re = (short)((r1*cos(-3*M_PI/4.0))*CP);
m_16apsk[15].im = (short)((r1*sin(-3*M_PI/4.0))*CP);
// 32 APSK
r3 = m;
switch( m_format[0].code_rate )
{
case CR_3_4:
r1 = r3/5.27;
r2 = r1*2.84;
break;
case CR_4_5:
r1 = r3/4.87;
r2 = r1*2.72;
break;
case CR_5_6:
r1 = r3/4.64;
r2 = r1*2.64;
break;
case CR_8_9:
r1 = r3/4.33;
r2 = r1*2.54;
break;
case CR_9_10:
r1 = r3/4.30;
r2 = r1*2.53;
break;
default:
// Illegal
r1 = 0;
r2 = 0;
break;
}
m_32apsk[0].re = (short)((r2*cos(M_PI/4.0))*CP);
m_32apsk[0].im = (short)((r2*sin(M_PI/4.0))*CP);
m_32apsk[1].re = (short)((r2*cos(5*M_PI/12.0))*CP);
m_32apsk[1].im = (short)((r2*sin(5*M_PI/12.0))*CP);
m_32apsk[2].re = (short)((r2*cos(-M_PI/4.0))*CP);
m_32apsk[2].im = (short)((r2*sin(-M_PI/4.0))*CP);
m_32apsk[3].re = (short)((r2*cos(-5*M_PI/12.0))*CP);
m_32apsk[3].im = (short)((r2*sin(-5*M_PI/12.0))*CP);
m_32apsk[4].re = (short)((r2*cos(3*M_PI/4.0))*CP);
m_32apsk[4].im = (short)((r2*sin(3*M_PI/4.0))*CP);
m_32apsk[5].re = (short)((r2*cos(7*M_PI/12.0))*CP);
m_32apsk[5].im = (short)((r2*sin(7*M_PI/12.0))*CP);
m_32apsk[6].re = (short)((r2*cos(-3*M_PI/4.0))*CP);
m_32apsk[6].im = (short)((r2*sin(-3*M_PI/4.0))*CP);
m_32apsk[7].re = (short)((r2*cos(-7*M_PI/12.0))*CP);
m_32apsk[7].im = (short)((r2*sin(-7*M_PI/12.0))*CP);
m_32apsk[8].re = (short)((r3*cos(M_PI/8.0))*CP);
m_32apsk[8].im = (short)((r3*sin(M_PI/8.0))*CP);
m_32apsk[9].re = (short)((r3*cos(3*M_PI/8.0))*CP);
m_32apsk[9].im = (short)((r3*sin(3*M_PI/8.0))*CP);
m_32apsk[10].re = (short)((r3*cos(-M_PI/4.0))*CP);
m_32apsk[10].im = (short)((r3*sin(-M_PI/4.0))*CP);
m_32apsk[11].re = (short)((r3*cos(-M_PI/2.0))*CP);
m_32apsk[11].im = (short)((r3*sin(-M_PI/2.0))*CP);
m_32apsk[12].re = (short)((r3*cos(3*M_PI/4.0))*CP);
m_32apsk[12].im = (short)((r3*sin(3*M_PI/4.0))*CP);
m_32apsk[13].re = (short)((r3*cos(M_PI/2.0))*CP);
m_32apsk[13].im = (short)((r3*sin(M_PI/2.0))*CP);
m_32apsk[14].re = (short)((r3*cos(-7*M_PI/8.0))*CP);
m_32apsk[14].im = (short)((r3*sin(-7*M_PI/8.0))*CP);
m_32apsk[15].re = (short)((r3*cos(-5*M_PI/8.0))*CP);
m_32apsk[15].im = (short)((r3*sin(-5*M_PI/8.0))*CP);
m_32apsk[16].re = (short)((r2*cos(M_PI/12.0))*CP);
m_32apsk[16].im = (short)((r2*sin(M_PI/12.0))*CP);
m_32apsk[17].re = (short)((r1*cos(M_PI/4.0))*CP);
m_32apsk[17].im = (short)((r1*sin(M_PI/4.0))*CP);
m_32apsk[18].re = (short)((r2*cos(-M_PI/12.0))*CP);
m_32apsk[18].im = (short)((r2*sin(-M_PI/12.0))*CP);
m_32apsk[19].re = (short)((r1*cos(-M_PI/4.0))*CP);
m_32apsk[19].im = (short)((r1*sin(-M_PI/4.0))*CP);
m_32apsk[20].re = (short)((r2*cos(11*M_PI/12.0))*CP);
m_32apsk[20].im = (short)((r2*sin(11*M_PI/12.0))*CP);
m_32apsk[21].re = (short)((r1*cos(3*M_PI/4.0))*CP);
m_32apsk[21].im = (short)((r1*sin(3*M_PI/4.0))*CP);
m_32apsk[22].re = (short)((r2*cos(-11*M_PI/12.0))*CP);
m_32apsk[22].im = (short)((r2*sin(-11*M_PI/12.0))*CP);
m_32apsk[23].re = (short)((r1*cos(-3*M_PI/4.0))*CP);
m_32apsk[23].im = (short)((r1*sin(-3*M_PI/4.0))*CP);
m_32apsk[24].re = (short)((r3*cos(0.0))*CP);
m_32apsk[24].im = (short)((r3*sin(0.0))*CP);
m_32apsk[25].re = (short)((r3*cos(M_PI/4.0))*CP);
m_32apsk[25].im = (short)((r3*sin(M_PI/4.0))*CP);
m_32apsk[26].re = (short)((r3*cos(-M_PI/8.0))*CP);
m_32apsk[26].im = (short)((r3*sin(-M_PI/8.0))*CP);
m_32apsk[27].re = (short)((r3*cos(-3*M_PI/8.0))*CP);
m_32apsk[27].im = (short)((r3*sin(-3*M_PI/8.0))*CP);
m_32apsk[28].re = (short)((r3*cos(7*M_PI/8.0))*CP);
m_32apsk[28].im = (short)((r3*sin(7*M_PI/8.0))*CP);
m_32apsk[29].re = (short)((r3*cos(5*M_PI/8.0))*CP);
m_32apsk[29].im = (short)((r3*sin(5*M_PI/8.0))*CP);
m_32apsk[30].re = (short)((r3*cos(M_PI))*CP);
m_32apsk[30].im = (short)((r3*sin(M_PI))*CP);
m_32apsk[31].re = (short)((r3*cos(-3*M_PI/4.0))*CP);
m_32apsk[31].im = (short)((r3*sin(-3*M_PI/4.0))*CP);
}
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