VE7UWU/sdrangel
1
0
Fork 0
mirror of https://github.com/f4exb/sdrangel.git synced 2026-08-14 15:33:34 -04:00
Code Issues Projects Releases Wiki Activity

Add DVB-S2 modulator

Browse Source
This commit is contained in:
Jon Beniston
2021-03-31 16:41:42 +01:00
parent c4e9ada144
commit 0857f1348a
23 changed files with 4114 additions and 76 deletions
Download Patch File Download Diff File Expand all files Collapse all files
plugins/channeltx/moddatv/dvb-s2/DVBS2.cpp
+156
View File
@@ -0,0 +1,156 @@
#include "memory.h"
#include "DVBS2.h"
//
// called at the end of a frame
//
void DVBS2::end_of_frame_actions(void)
{
if( m_s2_config_updated )
{
modulator_configuration();
m_s2_config_updated = 0;
}
}
int DVBS2::is_valid( int mod, int coderate )
{
if( mod == M_QPSK )
{
if(coderate == CR_1_4) return 0;
if(coderate == CR_1_3) return 0;
if(coderate == CR_2_5) return 0;
if(coderate == CR_1_2) return 0;
if(coderate == CR_3_5) return 0;
if(coderate == CR_2_3) return 0;
if(coderate == CR_3_4) return 0;
if(coderate == CR_4_5) return 0;
if(coderate == CR_5_6) return 0;
if(coderate == CR_8_9) return 0;
if(coderate == CR_9_10) return 0;
}
if( mod == M_8PSK )
{
if(coderate == CR_3_5) return 0;
if(coderate == CR_2_3) return 0;
if(coderate == CR_3_4) return 0;
if(coderate == CR_5_6) return 0;
if(coderate == CR_8_9) return 0;
if(coderate == CR_9_10) return 0;
}
if( mod == M_16APSK )
{
if(coderate == CR_2_3) return 0;
if(coderate == CR_3_4) return 0;
if(coderate == CR_4_5) return 0;
if(coderate == CR_5_6) return 0;
if(coderate == CR_8_9) return 0;
if(coderate == CR_9_10) return 0;
}
if( mod == M_32APSK )
{
if(coderate == CR_3_4) return 0;
if(coderate == CR_4_5) return 0;
if(coderate == CR_5_6) return 0;
if(coderate == CR_8_9) return 0;
if(coderate == CR_9_10) return 0;
}
return -1;
}
//
// index 0 and 1 will only be different when being reconfigured.
// Use index 1 as this will be applied in the following transmit
// frames
//
void DVBS2::calc_efficiency( void )
{
double p,m,a,s,b,po;
// Calculate the number of symbols in the payload
p = 0;a = 0; m = 0;
if( m_format[1].frame_type == FRAME_NORMAL ) p = (double)FRAME_SIZE_NORMAL;
if( m_format[1].frame_type == FRAME_SHORT ) p = (double)FRAME_SIZE_SHORT;
if( m_format[1].constellation == M_QPSK ) m = 2.0;
if( m_format[1].constellation == M_8PSK ) m = 3.0;
if( m_format[1].constellation == M_16APSK ) m = 4.0;
if( m_format[1].constellation == M_32APSK ) m = 5.0;
s = p/m;//Number of symbols per frame
// PL header overhead
if( m_format[1].pilots )
{
po = (s/(90*16))-1;// 1 pilot every 16 blocks (of 90 symbols)
po = po*36; // No pilot at the end
a = s/(90+po+s);
}
else
{
a = s/(90+s);// No pilots
}
// Modulation efficiency
a = a*m;
// Take into account pilot symbols
// TBD
// Now calculate the useable data as percentage of the frame
b = ((double)m_format[1].useable_data_bits)/p;
// Now calculate the efficiency by multiplying the
// useable bits efficiency by the modulation efficiency
m_efficiency = b*a;
}
//
// Multiply the efficiency value by the symbol rate
// to get the useable bitrate
//
double DVBS2::s2_get_efficiency( void )
{
return m_efficiency;
}
int DVBS2::s2_set_configure( DVB2FrameFormat *f )
{
if( is_valid( f->constellation, f->code_rate ) == 0 )
{
if( set_configure( f ) == 0 )
{
calc_efficiency();
m_s2_config_updated = 1;
m_configured = 1;
return 0;
}
}
return -1;
}
void DVBS2::s2_get_configure( DVB2FrameFormat *f )
{
get_configure( f );
}
int DVBS2::s2_add_ts_frame( u8 *ts )
{
int res = 0;
if (m_configured == 0) return 0;
// Call base class
if( next_ts_frame_base( ts ) )
{
// Interleave and pack
s2_interleave();
// create the header
s2_pl_header_create();
// Add the data
res = s2_pl_data_pack();
// Do any updates required for the next frame
end_of_frame_actions();
}
return res;
}
void DVBS2::physical( void )
{
}
DVBS2::DVBS2()
{
m_configured = 0;
modulator_configuration();
build_symbol_scrambler_table();
pl_build_dummy();
}