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[fix](trx-ft8): log minimum LDPC parity errors per pass in FT2 window

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Add err=N/N/N/N/N to the FT2 window diagnostic log line, showing the
minimum number of unsatisfied parity equations across all candidates
for each of the five LLR passes. This makes it possible to distinguish
between a signal-quality-limited failure (small error count) and a
systematic decoder bug (large error count), which is the key unknown
in diagnosing the current FT2 LDPC non-convergence.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>
This commit is contained in:
Stan Grams
2026-03-15 07:21:38 +01:00
parent 188fa38f1b
commit 0d2eb7adcd
1 changed files with 11 additions and 1 deletions
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src/decoders/trx-ft8/src/ft8_wrapper.c
+11 -1
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@@ -1537,6 +1537,7 @@ int ft8_decoder_decode(ft8_decoder_t* dec, ft8_decode_result_t* out, int max_res
int pass_bp[5] = { 0 }; int pass_bp[5] = { 0 };
int pass_sp[5] = { 0 }; int pass_sp[5] = { 0 };
float pass_best_dmin[5] = { INFINITY, INFINITY, INFINITY, INFINITY, INFINITY }; float pass_best_dmin[5] = { INFINITY, INFINITY, INFINITY, INFINITY, INFINITY };
int pass_best_errors[5] = { FTX_LDPC_M, FTX_LDPC_M, FTX_LDPC_M, FTX_LDPC_M, FTX_LDPC_M };
for (int idx = 0; idx < num_hits && num_decoded < max_results; ++idx) for (int idx = 0; idx < num_hits && num_decoded < max_results; ++idx)
{ {
const ft2_scan_hit_t* hit = &hit_list[idx]; const ft2_scan_hit_t* hit = &hit_list[idx];
@@ -1556,6 +1557,8 @@ int ft8_decoder_decode(ft8_decoder_t* dec, ft8_decode_result_t* out, int max_res
++pass_sp[pass]; ++pass_sp[pass];
if (pass_diag.dmin[pass] < pass_best_dmin[pass]) if (pass_diag.dmin[pass] < pass_best_dmin[pass])
pass_best_dmin[pass] = pass_diag.dmin[pass]; pass_best_dmin[pass] = pass_diag.dmin[pass];
if (pass_diag.nharderror[pass] >= 0 && pass_diag.nharderror[pass] < pass_best_errors[pass])
pass_best_errors[pass] = pass_diag.nharderror[pass];
} }
switch (fail_stage) switch (fail_stage)
{ {
@@ -1596,6 +1599,8 @@ int ft8_decoder_decode(ft8_decoder_t* dec, ft8_decode_result_t* out, int max_res
++pass_sp[pass]; ++pass_sp[pass];
if (pass_diag.dmin[pass] < pass_best_dmin[pass]) if (pass_diag.dmin[pass] < pass_best_dmin[pass])
pass_best_dmin[pass] = pass_diag.dmin[pass]; pass_best_dmin[pass] = pass_diag.dmin[pass];
if (pass_diag.nharderror[pass] >= 0 && pass_diag.nharderror[pass] < pass_best_errors[pass])
pass_best_errors[pass] = pass_diag.nharderror[pass];
} }
int idx_hash = message.hash % 200; int idx_hash = message.hash % 200;
@@ -1648,7 +1653,7 @@ int ft8_decoder_decode(ft8_decoder_t* dec, ft8_decode_result_t* out, int max_res
num_decoded = fallback_decoded; num_decoded = fallback_decoded;
} }
LOG(LOG_INFO, LOG(LOG_INFO,
"FT2 window: raw=%d peaks=%d hits=%d best_peak=%.3f best_sync=%.3f decoded=%d fallback=%d fail(sync=%d freq=%d down=%d bits=%d qual=%d ldpc=%d crc=%d unpack=%d) pass(bp=%d/%d/%d/%d/%d sp=%d/%d/%d/%d/%d dmin=%.2f/%.2f/%.2f/%.2f/%.2f)\n", "FT2 window: raw=%d peaks=%d hits=%d best_peak=%.3f best_sync=%.3f decoded=%d fallback=%d fail(sync=%d freq=%d down=%d bits=%d qual=%d ldpc=%d crc=%d unpack=%d) pass(bp=%d/%d/%d/%d/%d sp=%d/%d/%d/%d/%d err=%d/%d/%d/%d/%d dmin=%.2f/%.2f/%.2f/%.2f/%.2f)\n",
dec->ft2_raw_len, dec->ft2_raw_len,
scan_stats.peaks_found, scan_stats.peaks_found,
scan_stats.hits_found, scan_stats.hits_found,
@@ -1666,6 +1671,11 @@ int ft8_decoder_decode(ft8_decoder_t* dec, ft8_decode_result_t* out, int max_res
fail_unpack, fail_unpack,
pass_bp[0], pass_bp[1], pass_bp[2], pass_bp[3], pass_bp[4], pass_bp[0], pass_bp[1], pass_bp[2], pass_bp[3], pass_bp[4],
pass_sp[0], pass_sp[1], pass_sp[2], pass_sp[3], pass_sp[4], pass_sp[0], pass_sp[1], pass_sp[2], pass_sp[3], pass_sp[4],
(pass_best_errors[0] < FTX_LDPC_M) ? pass_best_errors[0] : -1,
(pass_best_errors[1] < FTX_LDPC_M) ? pass_best_errors[1] : -1,
(pass_best_errors[2] < FTX_LDPC_M) ? pass_best_errors[2] : -1,
(pass_best_errors[3] < FTX_LDPC_M) ? pass_best_errors[3] : -1,
(pass_best_errors[4] < FTX_LDPC_M) ? pass_best_errors[4] : -1,
isfinite(pass_best_dmin[0]) ? pass_best_dmin[0] : -1.0f, isfinite(pass_best_dmin[0]) ? pass_best_dmin[0] : -1.0f,
isfinite(pass_best_dmin[1]) ? pass_best_dmin[1] : -1.0f, isfinite(pass_best_dmin[1]) ? pass_best_dmin[1] : -1.0f,
isfinite(pass_best_dmin[2]) ? pass_best_dmin[2] : -1.0f, isfinite(pass_best_dmin[2]) ? pass_best_dmin[2] : -1.0f,