Transmission of digital signals by orthogonal frequency...

Details Transmission of digital signals by orthogonal frequency... Transmission of digital signals by orthogonal frequency...

H - Electricity

04

J

H04J 11/00 (2006.01) H03M 13/25 (2006.01) H03M 13/29 (2006.01) H04J 1/00 (2006.01) H04J 1/02 (2006.01) H04L 27/26 (2006.01)

Patent

CA 2263669

In an orthogonal frequency division multiplexing (OFDM) system (10) which uses an outer Reed-Solomon encoder and interleaver (24) and an inner convolutional encoder (26), after the inner convolutional encoding the data bits are interleaved by an inner interleaver (28), and then grouped into symbols, each symbol having "m" bits. After grouping, the symbols are mapped to a complex plane using quadrature amplitude modulation (QAM). Thus, bits, not symbols, are interleaved by the inner interleaver (28). A receiver (12) performs a soft decision regarding the value of each bit in each complex QAM symbol received.

Dans un système de multiplexage par répartition en fréquence orthogonale (OFDM) (10) qui utilise un codeur et un entrelaceur Reed-Solomon externes (24), ainsi qu'un codeur interne convolutionnel (26), après le codage interne par convolution de bits de données, ces bits de données sont entrelacés au moyen d'un entrelaceur interne (28), puis sont regroupés sous forme de symboles, chaque symbole présentant "m" bits. Après le regroupement, les symboles sont mappés en un plan complexe au moyen d'une modulation d'amplitude en quadrature (MAQ). Ainsi, les bits, et non pas les symboles, sont entrelacés au moyen de l'entrelaceur interne (28). Un récepteur (12) exécute une décision pondérée concernant la valeur de chaque bit dans chaque symbole MAQ complexe qui est reçu.

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