[webftr-js8-lab] command=ldpc-soft-decode
[webftr-js8-lab] root=/decoders/js8_decoder
[webftr-js8-lab] log=/decoders/js8_decoder/logs/20260527T083033Z_ldpc-soft-decode.log
[webftr-js8-lab] manifest=/decoders/js8_decoder/logs/20260527T083033Z_ldpc-soft-decode_manifest.json
[webftr-js8-lab] utc=20260527T083033Z
[webftr-js8-lab] rx-only guard: no TX / no PTT / no Tune / no Send

[webftr-js8-lab] JSON output: /decoders/js8_decoder/logs/20260527T083033Z_ldpc_soft_decode_output.json
[webftr-js8-lab] JSON timeout guard: 75s
{
  "ok": true,
  "mode": "JS8",
  "tool": "webftr-js8-soft-ldpc-minsum-probe",
  "tool_version": "step47-message91-crc-guided-bit-repair-probe",
  "input_wav": null,
  "candidate_json": "/decoders/js8_decoder/runtime/timing_boundary_sweep/step43_best_timing_fec_candidate.json",
  "rx_only": true,
  "safety": {
    "tx": false,
    "ptt": false,
    "tune": false,
    "send": false,
    "js8call_runtime_control": false
  },
  "implementation_stage": "step43_direct_primary_syndrome_closure_repair_candidates_no_message_unpack",
  "matrix": {
    "code": "(174,91)",
    "message_bits": 91,
    "parity_bits": 83,
    "codeword_bits": 174,
    "check_count": 83
  },
  "decoder": {
    "algorithm": "normalized_min_sum_multi_trial",
    "max_iterations": 32,
    "default_alpha": 0.8,
    "llr_convention": "positive=bit0_more_likely, negative=bit1_more_likely",
    "mapping_expansion": "ft8_gray_demap_plus_bitrev_interleaver_candidates",
    "max_decode_rows": 1,
    "fast_trials": true,
    "trial_count": 2,
    "timeout_avoidance": "direct_primary_first_default_1_row",
    "direct_timing_primary_preserved": true,
    "hard_repair_probe": {
      "repair_rows": 1,
      "repair_pool_size": 18,
      "repair_max_depth": 2
    }
  },
  "candidate_context": {
    "nsps_used": 6400,
    "nsps_is_js8_realistic": true,
    "selected_profile": null,
    "selected_variant": {
      "name": "step43_timing_sweep_best_syndrome_row",
      "rank_score": 1107.311136,
      "complete_174bit_candidate": true,
      "hard_bits_sha256_16": "0228efbd612c9092",
      "hard_weight_174": 140,
      "llr_stats": {
        "count": 174,
        "avg_abs": 1.827784,
        "min_abs": 0.008053,
        "max_abs": 4.126624,
        "positive": 36,
        "negative": 138,
        "zero": 0
      }
    }
  },
  "candidate_mapping_rows": 865,
  "probe_count": 2,
  "best_soft_decode": {
    "variant": "step43_timing_sweep_best_syndrome_row",
    "transform": "direct_timing_sweep_primary",
    "mapping_meta": {
      "direct_timing_sweep_primary": true,
      "source_mapping_meta": {
        "tone_mapping": "lsb_within_each_tone",
        "interleaver": "none",
        "polarity": "inverted"
      },
      "source_transform": "lsb_within_each_tone+no_interleaver+inverted_bits",
      "source_variant": "mapped_ft8_gray_alt_high_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse"
    },
    "decoder_trial": {
      "llr_scale": 0.75,
      "alpha": 0.7
    },
    "source_rank_score": 3107.3111360000003,
    "source_llr_stats": {
      "count": 174,
      "avg_abs": 1.827784,
      "min_abs": 0.008053,
      "max_abs": 4.126624,
      "positive": 36,
      "negative": 138,
      "zero": 0
    },
    "success": false,
    "iterations_used": 32,
    "final_syndrome_weight": 30,
    "message91": null,
    "message91_sha256_16": "95cb11678c7a80df",
    "codeword174_sha256_16": "57946ed9075f03b0",
    "trace": [
      {
        "iteration": 0,
        "syndrome_weight": 42
      },
      {
        "iteration": 1,
        "syndrome_weight": 39
      },
      {
        "iteration": 2,
        "syndrome_weight": 43
      },
      {
        "iteration": 3,
        "syndrome_weight": 41
      },
      {
        "iteration": 4,
        "syndrome_weight": 38
      },
      {
        "iteration": 5,
        "syndrome_weight": 45
      },
      {
        "iteration": 6,
        "syndrome_weight": 39
      },
      {
        "iteration": 7,
        "syndrome_weight": 46
      },
      {
        "iteration": 8,
        "syndrome_weight": 45
      },
      {
        "iteration": 9,
        "syndrome_weight": 40
      },
      {
        "iteration": 10,
        "syndrome_weight": 42
      },
      {
        "iteration": 15,
        "syndrome_weight": 44
      },
      {
        "iteration": 20,
        "syndrome_weight": 50
      },
      {
        "iteration": 25,
        "syndrome_weight": 40
      },
      {
        "iteration": 30,
        "syndrome_weight": 40
      }
    ],
    "hard_repair_probe": {
      "ok": true,
      "initial_syndrome_weight": 22,
      "best_syndrome_weight": 20,
      "best_flip_indices": [
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      "best_flip_count": 2,
      "pool_size": 18,
      "max_depth": 2,
      "probes": 171,
      "valid_codeword_hard_decision": false,
      "message91_sha256_16": "67b59638aa8882d6",
      "codeword174_sha256_16": "3e21661e33a987a7"
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    "syndrome_closure_repair_probe": {
      "ok": true,
      "diagnostic_only": true,
      "method": "systematic_syndrome_closure_ranked_by_llr_cost",
      "initial_syndrome_weight": 22,
      "initial_unsatisfied_checks": [
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      "message_pool_size": 18,
      "message_pool_indices": [
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      "max_message_depth": 3,
      "evaluated_candidates": 988,
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        "message_flip_count": 0,
        "parity_flip_count": 22,
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        "parity_flip_cost": 32.134663,
        "total_reliability_cost": 32.134663,
        "closed_syndrome_weight": 999,
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        "message91": "1011100111111101111111111111011111111101110111101011001111101011111010111111111011101111111",
        "message91_sha256_16": "67b59638aa8882d6",
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          "message_flip_count": 0,
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            "message_flip_count": 3,
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            "message_flip_cost": 1.170591,
            "parity_flip_cost": 48.765114,
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            "message91_sha256_16": "8665604134db9f8b",
            "codeword174_sha256_16": "55ae0659353d3c4e"
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            "message_flip_count": 3,
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            "closed_syndrome_weight": 999,
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            "all_flip_indices": [
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            "message_flip_count": 3,
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            "all_flip_indices": [
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            "message_flip_count": 1,
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            "closed_syndrome_weight": 999,
            "valid_codeword_hard_decision": true,
            "message91": "1011100111111101111111111111011111111101110111101011001111101011111010111111111011101011111",
            "message91_sha256_16": "6830a3cab7de2075",
            "codeword174_sha256_16": "b50b960ae03a0ea9"
          },
          {
            "message_flip_indices": [
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            "parity_flip_indices": [
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            "all_flip_indices": [
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            ],
            "message_flip_count": 3,
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            "total_flip_count": 34,
            "message_flip_cost": 0.353937,
            "parity_flip_cost": 52.218387,
            "total_reliability_cost": 52.572324,
            "closed_syndrome_weight": 999,
            "valid_codeword_hard_decision": true,
            "message91": "1011100111111101111111111111010111111101110111101111001111101011111010111111111011101011111",
            "message91_sha256_16": "ec338375494e781a",
            "codeword174_sha256_16": "96eccd15b2b6fe05"
          }
        ],
        "warning": "Syndrome closure can always form a codeword by parity repair; this is only a ranked candidate generator until JS8 message unpack/CRC validates a candidate."
      }
    }
  ],
  "decodes": [],
  "outputs": {
    "ldpc_soft_decode_json": "/decoders/js8_decoder/runtime/ldpc_soft_decode/step43_ldpc_soft_decode.json"
  },
  "warnings": [
    "Step 47 keeps the direct timing-sweep primary row first and adds a bounded syndrome-closure repair candidate generator ranked by LLR reliability cost.",
    "Step 47 syndrome-closure repair is diagnostic only: parity repair can force syndrome zero, so candidates still need JS8 message unpack/CRC validation before they count as real decodes.",
    "This still does not unpack JS8 text or validate CRC/message payloads.",
    "If soft success is true or a syndrome-closure candidate passes future JS8 message/CRC validation, the next step can unpack the 91-bit message. Otherwise continue timing/interleaver/LLR tuning."
  ],
  "next_action": "Inspect best_syndrome_closure_repair_probe.top_candidates. Next step should add bounded JS8 91-bit message unpack/CRC validation for the ranked candidate messages while keeping timing best row unchanged."
}

[webftr-js8-lab] OK
[webftr-js8-lab] log file: /decoders/js8_decoder/logs/20260527T083033Z_ldpc-soft-decode.log
[webftr-js8-lab] manifest: /decoders/js8_decoder/logs/20260527T083033Z_ldpc-soft-decode_manifest.json