rpitx/csdr
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

EARLYLATE now verified

Browse source
This commit is contained in:
ha7ilm 2017-03-06 22:31:32 +01:00
parent dde8fa0d08
commit 09c873c13d
2 changed files with 16 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
csdr.c
View file

@ -2376,7 +2376,8 @@ int main(int argc, char *argv[])
timing_recovery_state_t state = timing_recovery_init(algorithm, decimation, add_q);
int debug_i=0;
state.debug_writefiles = state.debug_force = !!debug_n; //should remove that later
state.debug_writefiles = 1;
state.debug_force = !!debug_n; //should remove that later
FREAD_C;
for(;;)
{

20
libcsdr.c
View file

@ -1727,6 +1727,10 @@ void timing_recovery_cc(complexf* input, complexf* output, int input_size, timin
for(si=0;;si++)
{
if(current_bitstart_index + num_samples_halfbit * 3 >= input_size) break;
int el_point_left_index = current_bitstart_index + num_samples_quarterbit * 3;
int el_point_right_index = current_bitstart_index + num_samples_quarterbit * 1 - correction_offset;
int el_point_mid_index = current_bitstart_index + num_samples_halfbit;
output[si++] = input[current_bitstart_index + num_samples_halfbit];
error = (
iof(input, current_bitstart_index + num_samples_halfbit * 3) - iof(input, current_bitstart_index + num_samples_halfbit)
@ -1754,14 +1758,17 @@ void timing_recovery_cc(complexf* input, complexf* output, int input_size, timin
0); //last argument is dummy, for the comma
}
if(MTIMINGR_HDEBUG) fprintf(stderr, "current_bitstart_index = %d, error = %g\n", current_bitstart_index, error);
current_bitstart_index += num_samples_bit + ((error)?((error>0)?1:-1):0);
//hey, this should be fixed here:
correction_offset = num_samples_halfbit * (-error/2);
current_bitstart_index += num_samples_bit + correction_offset;
//current_bitstart_index += num_samples_bit + ((error)?((error>0)?1:-1):0);
if(MTIMINGR_HDEBUG) fprintf(stderr, "new current_bitstart_index = %d\n", current_bitstart_index);
if(si>=input_size) { break; }
}
}
else if(state->algorithm == TIMING_RECOVERY_ALGORITHM_EARLYLATE)
{
//bitstart index should be at symbol maximum effect point
//bitstart index should be at symbol edge, maximum effect point is at current_bitstart_index + num_samples_halfbit
for(si=0;;si++)
{
//the MathWorks style algorithm has correction_offset.
@ -1775,10 +1782,12 @@ void timing_recovery_cc(complexf* input, complexf* output, int input_size, timin
if(MTIMINGR_HDEBUG) fprintf(stderr, "correction_offset = %d, reset to 0!\n", correction_offset);
correction_offset = 0;
}
output[si++] = input[current_bitstart_index];
//should check if the sign of the correction_offset (or disabling it) has an effect on the EVM.
//it is also a possibility to disable multiplying with the magnitude
int el_point_left_index = current_bitstart_index + num_samples_quarterbit * 3;
int el_point_right_index = current_bitstart_index + num_samples_quarterbit * 1 - correction_offset;
int el_point_mid_index = current_bitstart_index + num_samples_halfbit;
output[si++] = input[current_bitstart_index + el_point_mid_index];
error = ( iof(input, el_point_left_index) - iof(input, el_point_right_index)) * iof(input, el_point_mid_index);
if(state->use_q)
@ -1801,14 +1810,13 @@ void timing_recovery_cc(complexf* input, complexf* output, int input_size, timin
current_bitstart_index,
correction_offset,
state->debug_writefiles,
4,
0 , 'b',
3,
num_samples_quarterbit * 1, 'r',
num_samples_quarterbit * 2, 'r',
num_samples_quarterbit * 3, 'r',
0);
}
correction_offset = num_samples_halfbit * (-error/2);
correction_offset = num_samples_halfbit * (error/2);
current_bitstart_index += num_samples_bit + correction_offset;
if(si>=input_size)
{