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Correlator seems to be working

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jaseg 2020-03-06 11:54:33 +01:00
parent ad9e17c35c
commit e4693349cf
5 changed files with 35 additions and 20 deletions
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25
controller/fw/src/dsss_demod.c
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@ -32,6 +32,7 @@ void dsss_demod_step(struct dsss_demod_state *st, float new_value) {
//#define DEBUG_PRINT(...) ((void)0)
//#define DEBUG_PRINTN(...) ((void)0)
bool debug = sim_pos % DSSS_CORRELATION_LENGTH == DSSS_CORRELATION_LENGTH-1;
//bool debug = sim_pos > 1000;
if (debug) DEBUG_PRINT("Iteration %zd", sim_pos);
//const float peak_group_threshold = 0.05 * DSSS_CORRELATION_LENGTH;
//const float hole_patching_threshold = 0.01 * DSSS_CORRELATION_LENGTH;
@ -42,12 +43,16 @@ void dsss_demod_step(struct dsss_demod_state *st, float new_value) {
/* use new, incremented wpos for gold_correlate_step as first element of old data in ring buffer */
for (size_t i=0; i<DSSS_GOLD_CODE_COUNT; i++)
st->correlation[i][st->correlation_wpos] = gold_correlate_step(i, st->signal, st->signal_wpos, debug);
st->correlation[i][st->correlation_wpos] = gold_correlate_step(i, st->signal, st->signal_wpos, false);
/* debug */
if (debug) {
DEBUG_PRINTN(" [");
for (size_t i=0; i<DSSS_GOLD_CODE_COUNT; i++)
DEBUG_PRINTN("%8d ", i);
DEBUG_PRINTN("]\n");
DEBUG_PRINTN(" correlation: [");
for (size_t i=0; i<DSSS_GOLD_CODE_COUNT; i++)
DEBUG_PRINTN("%f, ", st->correlation[i][st->correlation_wpos]);
DEBUG_PRINTN("%8.5f, ", st->correlation[i][st->correlation_wpos]);
DEBUG_PRINTN("]\n");
}
/* end */
@ -57,24 +62,20 @@ void dsss_demod_step(struct dsss_demod_state *st, float new_value) {
for (size_t i=0; i<DSSS_GOLD_CODE_COUNT; i++)
cwt[i] = cwt_convolve_step(st->correlation[i], st->correlation_wpos);
/* debug */
/*
if (debug) DEBUG_PRINTN(" cwt: [");
if (debug) DEBUG_PRINTN(" cwt: [");
for (size_t i=0; i<DSSS_GOLD_CODE_COUNT; i++)
if (debug) DEBUG_PRINTN("%f, ", cwt[i]);
if (debug) DEBUG_PRINTN("%8.5f, ", cwt[i]);
if (debug) DEBUG_PRINTN("]\n");
*/
/* end */
float avg[DSSS_GOLD_CODE_COUNT];
for (size_t i=0; i<DSSS_GOLD_CODE_COUNT; i++)
avg[i] = run_iir(fabs(cwt[i]), ARRAY_LENGTH(cwt_filter_bq), cwt_filter_bq, st->cwt_filter[i].st);
/* debug */
/*
DEBUG_PRINTN(" avg: [");
if (debug) DEBUG_PRINTN(" avg: [");
for (size_t i=0; i<DSSS_GOLD_CODE_COUNT; i++)
DEBUG_PRINTN("%f, ", avg[i]);
DEBUG_PRINTN("]\n");
*/
if (debug) DEBUG_PRINTN("%8.5f, ", avg[i]);
if (debug) DEBUG_PRINTN("]\n");
/* end */
float max_val = st->group.max;
@ -150,7 +151,7 @@ float cwt_convolve_step(const float v[DSSS_WAVELET_LUT_SIZE], size_t offx) {
sum += v[(offx + j) % DSSS_WAVELET_LUT_SIZE] * dsss_cwt_wavelet_table[j];
//DEBUG_PRINT(" j=%d v=%f w=%f", j, v[(offx + j) % DSSS_WAVELET_LUT_SIZE], dsss_cwt_wavelet_table[j]);
}
return sum / DSSS_WAVELET_LUT_SIZE;
return sum;
}
/* Compute last element of correlation for input [a] and hard-coded gold sequences.