optic.comm.fec.decodeLDPC

decodeLDPC(llrs, param)

Decode multiple LDPC codewords using the belief propagation algorithms.

Parameters:

• llrs (np.array of shape (n, numCodewords)) – Array of log-likelihood ratios (LLRs) for each bit of the received codewords. Codewords are assumed to be disposed in columns.

• param (object) –

  Object containing the following attributes:

  • Hnp.array of shape (m, n)

    Sparse binary parity-check matrix of the LDPC code.

  • maxIterint

    Maximum number of iterations for belief propagation.

  • algstr

    Decoding algorithm to use (‘SPA’ for sum-product or ‘MSA’ for min-sum).

  • precdata-type

    Numerical precision to use in computations (default is np.float32).

Returns:

• decodedBits (np.array of shape (n, numCodewords)) – Array of decoded bits for each codeword.

• outputLLRs (np.array of shape (n, numCodewords)) – Array of updated log-likelihood ratios (LLRs) after decoding.