[webftr-js8-lab] command=ldpc-soft-decode
[webftr-js8-lab] root=/decoders/js8_decoder
[webftr-js8-lab] log=/decoders/js8_decoder/logs/20260527T111112Z_ldpc-soft-decode.log
[webftr-js8-lab] manifest=/decoders/js8_decoder/logs/20260527T111112Z_ldpc-soft-decode_manifest.json
[webftr-js8-lab] utc=20260527T111112Z
[webftr-js8-lab] rx-only guard: no TX / no PTT / no Tune / no Send

[webftr-js8-lab] JSON output: /decoders/js8_decoder/logs/20260527T111112Z_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": "step51-source-aligned-tone-offset-cli-fix",
  "input_wav": null,
  "candidate_json": "/decoders/js8_decoder/runtime/timing_boundary_sweep/step51_source_aligned_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": 6192,
    "nsps_is_js8_realistic": true,
    "selected_profile": null,
    "selected_variant": {
      "name": "step43_timing_sweep_best_syndrome_row",
      "rank_score": 1105.166392,
      "complete_174bit_candidate": true,
      "hard_bits_sha256_16": "95a1e941fbdff6b2",
      "hard_weight_174": 36,
      "llr_stats": {
        "count": 174,
        "avg_abs": 1.291598,
        "min_abs": 0.001433,
        "max_abs": 3.895705,
        "positive": 129,
        "negative": 45,
        "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": "ft8_gray_primary",
        "gray_direction": "inverse_observed_to_plain",
        "reverse_bits_within_tone_before_gray": false,
        "interleaver": "ft8_bitrev",
        "direction": "interleave_codeword_to_rx_inverse",
        "order_len": 174
      },
      "source_transform": "ft8_gray_primary_demap_msb_input+ft8_bitrev_interleave_codeword_to_rx_inverse",
      "source_variant": "mapped_ft8_gray_alt_high_demap_lsb_input+no_interleaver"
    },
    "decoder_trial": {
      "llr_scale": 0.75,
      "alpha": 0.7
    },
    "source_rank_score": 3105.166392,
    "source_llr_stats": {
      "count": 174,
      "avg_abs": 1.291598,
      "min_abs": 0.001433,
      "max_abs": 3.895705,
      "positive": 129,
      "negative": 45,
      "zero": 0
    },
    "success": false,
    "iterations_used": 32,
    "final_syndrome_weight": 33,
    "message91": null,
    "message91_sha256_16": "f36bdab26772186a",
    "codeword174_sha256_16": "96bf7b01bb067d48",
    "trace": [
      {
        "iteration": 0,
        "syndrome_weight": 43
      },
      {
        "iteration": 1,
        "syndrome_weight": 40
      },
      {
        "iteration": 2,
        "syndrome_weight": 42
      },
      {
        "iteration": 3,
        "syndrome_weight": 37
      },
      {
        "iteration": 4,
        "syndrome_weight": 40
      },
      {
        "iteration": 5,
        "syndrome_weight": 39
      },
      {
        "iteration": 6,
        "syndrome_weight": 48
      },
      {
        "iteration": 7,
        "syndrome_weight": 37
      },
      {
        "iteration": 8,
        "syndrome_weight": 41
      },
      {
        "iteration": 9,
        "syndrome_weight": 39
      },
      {
        "iteration": 10,
        "syndrome_weight": 44
      },
      {
        "iteration": 15,
        "syndrome_weight": 40
      },
      {
        "iteration": 20,
        "syndrome_weight": 44
      },
      {
        "iteration": 25,
        "syndrome_weight": 45
      },
      {
        "iteration": 30,
        "syndrome_weight": 41
      }
    ],
    "hard_repair_probe": {
      "ok": true,
      "initial_syndrome_weight": 22,
      "best_syndrome_weight": 21,
      "best_flip_indices": [
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      "best_flip_count": 1,
      "pool_size": 18,
      "max_depth": 2,
      "probes": 171,
      "valid_codeword_hard_decision": false,
      "message91_sha256_16": "d4ca2a05f15dd009",
      "codeword174_sha256_16": "4cf9e06f787f90f7"
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    "syndrome_closure_repair_probe": {
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      "diagnostic_only": true,
      "method": "systematic_syndrome_closure_ranked_by_llr_cost",
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      "initial_unsatisfied_checks": [
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      "message_pool_size": 18,
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      "max_message_depth": 3,
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    "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."
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            "message_flip_count": 3,
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            "total_flip_count": 32,
            "message_flip_cost": 0.334,
            "parity_flip_cost": 32.688588,
            "total_reliability_cost": 33.022588,
            "closed_syndrome_weight": 999,
            "valid_codeword_hard_decision": true,
            "message91": "0000000100000001000001000100000000000010001000000000011000000000000101100000000001000100110",
            "message91_sha256_16": "ea6738f37fdd0bca",
            "codeword174_sha256_16": "e64696234a9e9700"
          },
          {
            "message_flip_indices": [
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            ],
            "parity_flip_indices": [
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            "all_flip_indices": [
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            "message_flip_count": 2,
            "parity_flip_count": 28,
            "total_flip_count": 30,
            "message_flip_cost": 0.020221,
            "parity_flip_cost": 33.270029,
            "total_reliability_cost": 33.29025,
            "closed_syndrome_weight": 999,
            "valid_codeword_hard_decision": true,
            "message91": "0000100110000001000001000100000000000010001000000000010000000000000001100000000101000100110",
            "message91_sha256_16": "36258d9d38b0281f",
            "codeword174_sha256_16": "cb03d310703a3bef"
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          {
            "message_flip_indices": [
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            "all_flip_indices": [
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            "message_flip_count": 2,
            "parity_flip_count": 32,
            "total_flip_count": 34,
            "message_flip_cost": 0.01723,
            "parity_flip_cost": 33.416528,
            "total_reliability_cost": 33.433758,
            "closed_syndrome_weight": 999,
            "valid_codeword_hard_decision": true,
            "message91": "0000000100000001000001000100000010000010001000000000010000000000000001100000000111000100110",
            "message91_sha256_16": "d1dd1f00eea52156",
            "codeword174_sha256_16": "4529cc6ea45b8c15"
          },
          {
            "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": 36,
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            "parity_flip_cost": 33.260317,
            "total_reliability_cost": 33.473279,
            "closed_syndrome_weight": 999,
            "valid_codeword_hard_decision": true,
            "message91": "0000000100000001000001000100000000000110001000000000111000000000000001100000000101000100110",
            "message91_sha256_16": "f89221702d6c6b08",
            "codeword174_sha256_16": "17b3bb4d1d83b9f3"
          },
          {
            "message_flip_indices": [
              80,
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            "parity_flip_indices": [
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            ],
            "all_flip_indices": [
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            ],
            "message_flip_count": 3,
            "parity_flip_count": 35,
            "total_flip_count": 38,
            "message_flip_cost": 0.520175,
            "parity_flip_cost": 33.163717,
            "total_reliability_cost": 33.683892,
            "closed_syndrome_weight": 999,
            "valid_codeword_hard_decision": true,
            "message91": "0000000100000001000001000100000000000010001000000000010000000000000000100000000111000100111",
            "message91_sha256_16": "c8c54b0e1ae8c13f",
            "codeword174_sha256_16": "283f17c6b9b19017"
          },
          {
            "message_flip_indices": [
              47,
              24,
              69
            ],
            "parity_flip_indices": [
              92,
              93,
              94,
              95,
              99,
              100,
              101,
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              124,
              129,
              134,
              135,
              136,
              138,
              141,
              142,
              143,
              145,
              146,
              153,
              154,
              158,
              159,
              160,
              161,
              162,
              164,
              165,
              166,
              167,
              170,
              172
            ],
            "all_flip_indices": [
              47,
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              93,
              94,
              95,
              99,
              100,
              101,
              102,
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              143,
              145,
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              153,
              154,
              158,
              159,
              160,
              161,
              162,
              164,
              165,
              166,
              167,
              170,
              172
            ],
            "message_flip_count": 3,
            "parity_flip_count": 37,
            "total_flip_count": 40,
            "message_flip_cost": 0.429542,
            "parity_flip_cost": 33.702714,
            "total_reliability_cost": 34.132256,
            "closed_syndrome_weight": 999,
            "valid_codeword_hard_decision": true,
            "message91": "0000000100000001000001001100000000000010001000010000010000000000000000100000000101000100110",
            "message91_sha256_16": "937bbbe6622a93b8",
            "codeword174_sha256_16": "24013711efc6e35f"
          }
        ],
        "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 51 keeps the direct timing-sweep primary row first and adds a bounded syndrome-closure repair candidate generator ranked by LLR reliability cost.",
    "Step 51 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/20260527T111112Z_ldpc-soft-decode.log
[webftr-js8-lab] manifest: /decoders/js8_decoder/logs/20260527T111112Z_ldpc-soft-decode_manifest.json