Raptorq.Decoder (raptorq v0.2.0)

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Recover source data from received RaptorQ encoding symbols.

Decoding process (RFC 6330 §5.4)

  1. The receiver knows the ISI of each received symbol.
  2. A G_ENC row of the constraint matrix is built per ISI via Tuple[K', ISI], and the LDPC+HDPC rows are always present (with D = 0).
  3. The system A·C = D is formed and solved for C.
  4. The first K encoding symbols are regenerated from C and concatenated to produce the original source data.

received must contain at least K' symbols (the first K' G_ENC rows plus the S+H LDPC+HDPC rows give the full L×L system).

Summary

Functions

decode(received, k, data_size \\ nil)

Decode received symbols to recover original source data.

Functions

decode(received, k, data_size \\ nil)

Decode received symbols to recover original source data.

Parameters

  • received — list of {isi, symbol_binary} tuples
  • k — number of source symbols in the original block
  • data_size — total byte size of the original source data (optional)

Returns {:ok, binary} with the decoded data, or {:error, reason}.