Systems and methods for ldpc coded modulation

H - Electricity – 03 – M

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H03M 13/25 (2006.01) H03M 13/11 (2006.01) H04L 1/00 (2006.01)

Patent

CA 2409179

Typical forward error correction methods employ Trellis Code Modulation. By substituting low density parity check coding in place of the convolution code as part of a combined modulation and encoding procedure, low density parity check coding and modulation can be performed. The low density parity check codes have no error floor, no cycles, an equal bit error rate for the information bits and the parity bits, and timely construction of both a parity check matrix with variable codeword size and a generator matrix is possible.

Les procédés classiques de correction d'erreurs sans voie de retour font intervenir une modulation par codage en treillis. En substituant le codage à contrôle de parité de faible densité (LDPC) au code de convolution en tant que partie d'une opération combinée de modulation et de codage, le codage LDPC et la modulation peuvent être réalisés. Les codes de contrôle de parité de faible densité ne présentent aucun seuil plancher d'erreur ni aucun cycle, et possèdent un taux d'erreur sur les bits égal pour les bits d'informations et les bits de parité. La construction opportune d'une matrice de contrôle de parité dotée d'une taille de mots de code variable ainsi que d'une matrice de génération est également possible.

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