[webftr-js8-lab] command=ldpc-matrix-probe
[webftr-js8-lab] root=/decoders/js8_decoder
[webftr-js8-lab] log=/decoders/js8_decoder/logs/20260526T153511Z_ldpc-matrix-probe.log
[webftr-js8-lab] manifest=/decoders/js8_decoder/logs/20260526T153511Z_ldpc-matrix-probe_manifest.json
[webftr-js8-lab] utc=20260526T153511Z
[webftr-js8-lab] rx-only guard: no TX / no PTT / no Tune / no Send

[webftr-js8-lab] JSON output: /decoders/js8_decoder/logs/20260526T153511Z_ldpc_matrix_probe_output.json
[webftr-js8-lab] JSON timeout guard: 180s
{
  "ok": true,
  "mode": "JS8",
  "tool": "webftr-js8-real-ldpc-matrix-syndrome-probe",
  "tool_version": "step33-auto-anchor-candidate-guard",
  "input_wav": null,
  "candidate_json": "/decoders/js8_decoder/runtime/fec_candidates/js8_quick_selected_window_fec_candidate_step17.json",
  "rx_only": true,
  "safety": {
    "tx": false,
    "ptt": false,
    "tune": false,
    "send": false,
    "js8call_runtime_control": false
  },
  "implementation_stage": "step19_real_ldpc_generator_matrix_syndrome_probe_no_message_unpack",
  "matrix": {
    "code": "(174,91) LDPC generator matrix",
    "generator_rows": 83,
    "generator_cols": 91,
    "message_bits": 91,
    "parity_bits": 83,
    "source_file": "ldpc_174_91_c_generator.f90"
  },
  "candidate_context": {
    "nsps_used": 6400,
    "nsps_is_js8_realistic": true,
    "selected_profile": {
      "profile": "js8_near_6400",
      "nsps": 6400,
      "symbol_duration_seconds": 0.533333,
      "tone_spacing_hz": 1.875,
      "note": "0.533 s timing guard candidate",
      "ok": true,
      "sync": {
        "start_seconds": 4.8,
        "base_freq_hz": 1025.0,
        "candidate_score": 47.4,
        "costas_hits": 2,
        "avg_margin_db": 8.01,
        "candidate_count": 12
      },
      "frame": {
        "symbols_available_after_start": 103,
        "data_symbol_count_estimate": 58,
        "expected_data_symbols_candidate": 58
      },
      "fec": {
        "soft_bit_count_estimate": 174,
        "missing_soft_bits_estimate": 0,
        "complete_ldpc_input_candidate_estimate": true
      },
      "rank_score": 225.085
    },
    "selected_variant": {
      "name": "raw_msb_symbol_order",
      "rank_score": 127.195892,
      "complete_174bit_candidate": true,
      "hard_bits_sha256_16": "c87312f86dbe74fc",
      "hard_weight_174": 36,
      "llr_stats": {
        "count": 174,
        "avg_abs": 2.298973,
        "min_abs": 0.012672,
        "max_abs": 4.421458,
        "positive": 141,
        "negative": 33,
        "zero": 0
      }
    }
  },
  "variant_probe_count": 20,
  "best_matrix_probe": {
    "variant": "lsb_within_each_tone",
    "transform": "reverse_codeword",
    "hard_weight_174": 36,
    "llr_avg_abs": 2.2989731149425303,
    "syndrome": {
      "bits_len": 174,
      "message91": "0000000010010000100000100010000100100000010100010010100000010000000110000000000000000000000",
      "parity83_observed": "11011011000000001000010010000010011000101110000001000011010000010000000000000000000",
      "parity83_expected": "01110011000100001111001010011100010001011100011000010110101100100001110101100110000",
      "syndrome83": "10101000000100000111011000011110001001110010011001010101111100110001110101100110000",
      "syndrome_weight": 38,
      "valid_codeword_hard_decision": false,
      "message91_sha256_16": "f14a0a9b25a2b204",
      "codeword174_sha256_16": "1c72d827ce8d55e5"
    },
    "repair": {
      "attempted": true,
      "flip_count": 10,
      "repair_success": false,
      "final_syndrome_weight": 20,
      "trace": [
        {
          "flip_index": 20,
          "llr_abs": 0.777135,
          "gain": 5,
          "syndrome_weight_after": 33
        },
        {
          "flip_index": 24,
          "llr_abs": 0.280146,
          "gain": 5,
          "syndrome_weight_after": 28
        },
        {
          "flip_index": 106,
          "llr_abs": 0.012672,
          "gain": 1,
          "syndrome_weight_after": 27
        },
        {
          "flip_index": 129,
          "llr_abs": 0.118003,
          "gain": 1,
          "syndrome_weight_after": 26
        },
        {
          "flip_index": 134,
          "llr_abs": 0.27805,
          "gain": 1,
          "syndrome_weight_after": 25
        },
        {
          "flip_index": 100,
          "llr_abs": 0.441842,
          "gain": 1,
          "syndrome_weight_after": 24
        },
        {
          "flip_index": 105,
          "llr_abs": 0.477879,
          "gain": 1,
          "syndrome_weight_after": 23
        },
        {
          "flip_index": 146,
          "llr_abs": 0.789541,
          "gain": 1,
          "syndrome_weight_after": 22
        },
        {
          "flip_index": 107,
          "llr_abs": 0.844266,
          "gain": 1,
          "syndrome_weight_after": 21
        },
        {
          "flip_index": 130,
          "llr_abs": 0.866369,
          "gain": 1,
          "syndrome_weight_after": 20
        }
      ],
      "repaired_message91_sha256_16": "30a1c148a602f866"
    }
  },
  "all_matrix_probes": [
    {
      "variant": "lsb_within_each_tone",
      "transform": "reverse_codeword",
      "hard_weight_174": 36,
      "llr_avg_abs": 2.2989731149425303,
      "syndrome": {
        "bits_len": 174,
        "message91": "0000000010010000100000100010000100100000010100010010100000010000000110000000000000000000000",
        "parity83_observed": "11011011000000001000010010000010011000101110000001000011010000010000000000000000000",
        "parity83_expected": "01110011000100001111001010011100010001011100011000010110101100100001110101100110000",
        "syndrome83": "10101000000100000111011000011110001001110010011001010101111100110001110101100110000",
        "syndrome_weight": 38,
        "valid_codeword_hard_decision": false,
        "message91_sha256_16": "f14a0a9b25a2b204",
        "codeword174_sha256_16": "1c72d827ce8d55e5"
      },
      "repair": {
        "attempted": true,
        "flip_count": 10,
        "repair_success": false,
        "final_syndrome_weight": 20,
        "trace": [
          {
            "flip_index": 20,
            "llr_abs": 0.777135,
            "gain": 5,
            "syndrome_weight_after": 33
          },
          {
            "flip_index": 24,
            "llr_abs": 0.280146,
            "gain": 5,
            "syndrome_weight_after": 28
          },
          {
            "flip_index": 106,
            "llr_abs": 0.012672,
            "gain": 1,
            "syndrome_weight_after": 27
          },
          {
            "flip_index": 129,
            "llr_abs": 0.118003,
            "gain": 1,
            "syndrome_weight_after": 26
          },
          {
            "flip_index": 134,
            "llr_abs": 0.27805,
            "gain": 1,
            "syndrome_weight_after": 25
          },
          {
            "flip_index": 100,
            "llr_abs": 0.441842,
            "gain": 1,
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          },
          {
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            "llr_abs": 0.477879,
            "gain": 1,
            "syndrome_weight_after": 23
          },
          {
            "flip_index": 146,
            "llr_abs": 0.789541,
            "gain": 1,
            "syndrome_weight_after": 22
          },
          {
            "flip_index": 107,
            "llr_abs": 0.844266,
            "gain": 1,
            "syndrome_weight_after": 21
          },
          {
            "flip_index": 130,
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          }
        ],
        "repaired_message91_sha256_16": "30a1c148a602f866"
      }
    },
    {
      "variant": "reverse_symbol_order",
      "transform": "as_exported",
      "hard_weight_174": 36,
      "llr_avg_abs": 2.2989731149425303,
      "syndrome": {
        "bits_len": 174,
        "message91": "0000000010010000100000100010000100100000010100010010100000010000000110000000000000000000000",
        "parity83_observed": "11011011000000001000010010000010011000101110000001000011010000010000000000000000000",
        "parity83_expected": "01110011000100001111001010011100010001011100011000010110101100100001110101100110000",
        "syndrome83": "10101000000100000111011000011110001001110010011001010101111100110001110101100110000",
        "syndrome_weight": 38,
        "valid_codeword_hard_decision": false,
        "message91_sha256_16": "f14a0a9b25a2b204",
        "codeword174_sha256_16": "1c72d827ce8d55e5"
      },
      "repair": {
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        "flip_count": 10,
        "repair_success": false,
        "final_syndrome_weight": 20,
        "trace": [
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            "llr_abs": 0.777135,
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          },
          {
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          {
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          },
          {
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            "llr_abs": 0.118003,
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          },
          {
            "flip_index": 134,
            "llr_abs": 0.27805,
            "gain": 1,
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          },
          {
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            "llr_abs": 0.441842,
            "gain": 1,
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          {
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            "gain": 1,
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          {
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          {
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          {
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          }
        ],
        "repaired_message91_sha256_16": "30a1c148a602f866"
      }
    },
    {
      "variant": "lab_mask_xor_preview",
      "transform": "reverse_inverted_codeword",
      "hard_weight_174": 89,
      "llr_avg_abs": 2.2989731149425303,
      "syndrome": {
        "bits_len": 174,
        "message91": "0000011100011110000100100100011110000111011010000001110000011100111011011111101101100101101",
        "parity83_observed": "10010101110000100111010110111000000100101110010011101111010011010110101001100111110",
        "parity83_expected": "11011000111000100000001010100000100111001001000000111110010000111101010101110111001",
        "syndrome83": "01001101001000000111011100011000100011100111010011010001000011101011111100010000111",
        "syndrome_weight": 39,
        "valid_codeword_hard_decision": false,
        "message91_sha256_16": "8b491571645dc45d",
        "codeword174_sha256_16": "f3eea2a3391faa1b"
      },
      "repair": {
        "attempted": true,
        "flip_count": 12,
        "repair_success": false,
        "final_syndrome_weight": 21,
        "trace": [
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          {
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        ],
        "repaired_message91_sha256_16": "a2f6548181c12c07"
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    },
    {
      "variant": "raw_msb_symbol_order",
      "transform": "as_exported",
      "hard_weight_174": 36,
      "llr_avg_abs": 2.2989731149425308,
      "syndrome": {
        "bits_len": 174,
        "message91": "0000000000000000000100000100110000010001101010000110100000100100000010000000110110110000000",
        "parity83_observed": "00000000000000011000000001000010001001010001000010010000001010000010000001001000000",
        "parity83_expected": "10110110111001110101001100000000001101110110000101101011100100100000011110010000100",
        "syndrome83": "10110110111001101101001101000010000100100111000111111011101110100010011111011000100",
        "syndrome_weight": 44,
        "valid_codeword_hard_decision": false,
        "message91_sha256_16": "c45c2e0e0df00c7e",
        "codeword174_sha256_16": "c87312f86dbe74fc"
      },
      "repair": {
        "attempted": true,
        "flip_count": 12,
        "repair_success": false,
        "final_syndrome_weight": 22,
        "trace": [
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          {
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          {
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          {
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          {
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          {
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          {
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          {
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          }
        ],
        "repaired_message91_sha256_16": "5cedcd76b3542a73"
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    },
    {
      "variant": "reverse_full_bitstream",
      "transform": "reverse_codeword",
      "hard_weight_174": 36,
      "llr_avg_abs": 2.2989731149425308,
      "syndrome": {
        "bits_len": 174,
        "message91": "0000000000000000000100000100110000010001101010000110100000100100000010000000110110110000000",
        "parity83_observed": "00000000000000011000000001000010001001010001000010010000001010000010000001001000000",
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        "syndrome83": "10110110111001101101001101000010000100100111000111111011101110100010011111011000100",
        "syndrome_weight": 44,
        "valid_codeword_hard_decision": false,
        "message91_sha256_16": "c45c2e0e0df00c7e",
        "codeword174_sha256_16": "c87312f86dbe74fc"
      },
      "repair": {
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        "flip_count": 12,
        "repair_success": false,
        "final_syndrome_weight": 22,
        "trace": [
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          {
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          {
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          {
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          {
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          {
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          },
          {
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          },
          {
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          },
          {
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          }
        ],
        "repaired_message91_sha256_16": "5cedcd76b3542a73"
      }
    },
    {
      "variant": "lsb_within_each_tone",
      "transform": "reverse_inverted_codeword",
      "hard_weight_174": 138,
      "llr_avg_abs": 2.2989731149425303,
      "syndrome": {
        "bits_len": 174,
        "message91": "1111111101101111011111011101111011011111101011101101011111101111111001111111111111111111111",
        "parity83_observed": "00100100111111110111101101111101100111010001111110111100101111101111111111111111111",
        "parity83_expected": "01110111001010011111111111110010000100101110001101100010101110001010100110100101110",
        "syndrome83": "01010011110101101000010010001111100011111111110011011110000001100101011001011010001",
        "syndrome_weight": 44,
        "valid_codeword_hard_decision": false,
        "message91_sha256_16": "5c3118af20363d11",
        "codeword174_sha256_16": "1c9b5e323afdd4c9"
      },
      "repair": {
        "attempted": true,
        "flip_count": 8,
        "repair_success": false,
        "final_syndrome_weight": 22,
        "trace": [
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          {
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          },
          {
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          },
          {
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          },
          {
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            "gain": 1,
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          },
          {
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          },
          {
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          },
          {
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          }
        ],
        "repaired_message91_sha256_16": "2167a6680230263a"
      }
    },
    {
      "variant": "reverse_symbol_order",
      "transform": "inverted_bits",
      "hard_weight_174": 138,
      "llr_avg_abs": 2.2989731149425303,
      "syndrome": {
        "bits_len": 174,
        "message91": "1111111101101111011111011101111011011111101011101101011111101111111001111111111111111111111",
        "parity83_observed": "00100100111111110111101101111101100111010001111110111100101111101111111111111111111",
        "parity83_expected": "01110111001010011111111111110010000100101110001101100010101110001010100110100101110",
        "syndrome83": "01010011110101101000010010001111100011111111110011011110000001100101011001011010001",
        "syndrome_weight": 44,
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          {
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            "gain": 1,
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          {
            "flip_index": 169,
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          {
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          {
            "flip_index": 160,
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            "gain": 1,
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          }
        ],
        "repaired_message91_sha256_16": "c6058330aaf6862c"
      }
    },
    {
      "variant": "lab_mask_xor_preview",
      "transform": "inverted_bits",
      "hard_weight_174": 89,
      "llr_avg_abs": 2.2989731149425308,
      "syndrome": {
        "bits_len": 174,
        "message91": "0111110011001010110101100101111011100100111010010000001110110101110010000111010100110110100",
        "parity83_observed": "11011011111101101110011100000111000000101101110000111100010010010000111100011100000",
        "parity83_expected": "00111000110110011110010011011111111111001101001101001100000110110010101100101001011",
        "syndrome83": "11100011001011110000001111011000111111100000111101110000010100100010010000110101011",
        "syndrome_weight": 41,
        "valid_codeword_hard_decision": false,
        "message91_sha256_16": "628648d393f820aa",
        "codeword174_sha256_16": "3bbe6f03ebc07469"
      },
      "repair": {
        "attempted": true,
        "flip_count": 9,
        "repair_success": false,
        "final_syndrome_weight": 26,
        "trace": [
          {
            "flip_index": 22,
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          {
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          }
        ],
        "repaired_message91_sha256_16": "5a5aaca0ed26b92b"
      }
    },
    {
      "variant": "lab_mask_xor_preview",
      "transform": "as_exported",
      "hard_weight_174": 85,
      "llr_avg_abs": 2.2989731149425308,
      "syndrome": {
        "bits_len": 174,
        "message91": "1000001100110101001010011010000100011011000101101111110001001010001101111000101011001001011",
        "parity83_observed": "00100100000010010001100011111000111111010010001111000011101101101111000011100011111",
        "parity83_expected": "00111100111000001110100110110001101010111111011000111000000100011001111111101010101",
        "syndrome83": "00011000111010011111000101001001010101101101010111111011101001110110111100001001010",
        "syndrome_weight": 45,
        "valid_codeword_hard_decision": false,
        "message91_sha256_16": "598576b479b73a31",
        "codeword174_sha256_16": "b1bb86c852f0f4ca"
      },
      "repair": {
        "attempted": true,
        "flip_count": 9,
        "repair_success": false,
        "final_syndrome_weight": 26,
        "trace": [
          {
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            "llr_abs": 0.724531,
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          },
          {
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          {
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          {
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          {
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            "gain": 1,
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          {
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            "gain": 1,
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          {
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          },
          {
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            "gain": 1,
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          }
        ],
        "repaired_message91_sha256_16": "6a4bf23bb102292e"
      }
    },
    {
      "variant": "raw_msb_symbol_order",
      "transform": "reverse_codeword",
      "hard_weight_174": 36,
      "llr_avg_abs": 2.2989731149425303,
      "syndrome": {
        "bits_len": 174,
        "message91": "0000001001000000100000101000000100100001000101001000100001000000001100000000000000000000001",
        "parity83_observed": "10110110000000100000010010000010110000101011000100000110010000010000000000000000000",
        "parity83_expected": "01011110011010101101101011001101010111111001000110010101100000100110100000011011100",
        "syndrome83": "11101000011010001101111001001111100111010010000010010011110000110110100000011011100",
        "syndrome_weight": 40,
        "valid_codeword_hard_decision": false,
        "message91_sha256_16": "91eee6bccceb5eea",
        "codeword174_sha256_16": "99d197b705881255"
      },
      "repair": {
        "attempted": true,
        "flip_count": 6,
        "repair_success": false,
        "final_syndrome_weight": 28,
        "trace": [
          {
            "flip_index": 30,
            "llr_abs": 0.268492,
            "gain": 7,
            "syndrome_weight_after": 33
          },
          {
            "flip_index": 129,
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            "gain": 1,
            "syndrome_weight_after": 32
          },
          {
            "flip_index": 100,
            "llr_abs": 0.441842,
            "gain": 1,
            "syndrome_weight_after": 31
          },
          {
            "flip_index": 151,
            "llr_abs": 0.652185,
            "gain": 1,
            "syndrome_weight_after": 30
          },
          {
            "flip_index": 146,
            "llr_abs": 0.789541,
            "gain": 1,
            "syndrome_weight_after": 29
          },
          {
            "flip_index": 107,
            "llr_abs": 0.844266,
            "gain": 1,
            "syndrome_weight_after": 28
          }
        ],
        "repaired_message91_sha256_16": "8c70e629248ac970"
      }
    },
    {
      "variant": "reverse_full_bitstream",
      "transform": "as_exported",
      "hard_weight_174": 36,
      "llr_avg_abs": 2.2989731149425303,
      "syndrome": {
        "bits_len": 174,
        "message91": "0000001001000000100000101000000100100001000101001000100001000000001100000000000000000000001",
        "parity83_observed": "10110110000000100000010010000010110000101011000100000110010000010000000000000000000",
        "parity83_expected": "01011110011010101101101011001101010111111001000110010101100000100110100000011011100",
        "syndrome83": "11101000011010001101111001001111100111010010000010010011110000110110100000011011100",
        "syndrome_weight": 40,
        "valid_codeword_hard_decision": false,
        "message91_sha256_16": "91eee6bccceb5eea",
        "codeword174_sha256_16": "99d197b705881255"
      },
      "repair": {
        "attempted": true,
        "flip_count": 6,
        "repair_success": false,
        "final_syndrome_weight": 28,
        "trace": [
          {
            "flip_index": 30,
            "llr_abs": 0.268492,
            "gain": 7,
            "syndrome_weight_after": 33
          },
          {
            "flip_index": 129,
            "llr_abs": 0.118003,
            "gain": 1,
            "syndrome_weight_after": 32
          },
          {
            "flip_index": 100,
            "llr_abs": 0.441842,
            "gain": 1,
            "syndrome_weight_after": 31
          },
          {
            "flip_index": 151,
            "llr_abs": 0.652185,
            "gain": 1,
            "syndrome_weight_after": 30
          },
          {
            "flip_index": 146,
            "llr_abs": 0.789541,
            "gain": 1,
            "syndrome_weight_after": 29
          },
          {
            "flip_index": 107,
            "llr_abs": 0.844266,
            "gain": 1,
            "syndrome_weight_after": 28
          }
        ],
        "repaired_message91_sha256_16": "8c70e629248ac970"
      }
    }
  ],
  "decodes": [],
  "outputs": {
    "ldpc_matrix_probe_json": "/decoders/js8_decoder/runtime/ldpc_matrix_probe/step19_ldpc_matrix_probe.json"
  },
  "warnings": [
    "Step 33 uses the real public FT8/JS8-style (174,91) generator matrix for a hard-decision syndrome probe.",
    "This is not yet a complete soft LDPC belief-propagation decoder and does not unpack JS8 messages.",
    "If best_matrix_probe reaches syndrome_weight 0, the next step can feed message91 into CRC/message unpack. Otherwise Step 33 should add real soft LDPC iterations."
  ],
  "next_action": "Upload logs. Next step: soft LDPC belief-propagation/min-sum decoder using this matrix contract, then JS8 message unpacking."
}

[webftr-js8-lab] OK
[webftr-js8-lab] log file: /decoders/js8_decoder/logs/20260526T153511Z_ldpc-matrix-probe.log
[webftr-js8-lab] manifest: /decoders/js8_decoder/logs/20260526T153511Z_ldpc-matrix-probe_manifest.json