Publication

System and method for reliably communicating the content of a live data stream

Résumé

A method for communicating the content of a live data stream to a receiver using a plurality of channels comprising two encoder channels used to encode the live data content prior to transmission. Initially a plurality of segments of a live data stream are received, wherein each segment contains segment data. A forward error correction algorithm is applied to each segment's data, thereby producing FEC-encoded segment data. The FEC-encoded segment data is contained within an FEC-encoded block, resulting in a corresponding plurality of FEC-encoded blocks being generated. Each FEC-encoded block is copied to a sub-channel on both a first encoder channel and a second encoder channel, resulting in a plurality of FEC-encoder blocks residing on the first and second encoder channels. The first and second encoder channels differ in the number of sub-channels they contain (interleaving depth), and accordingly the arrangement of the FEC-encoded blocks in the first and second encoder channels are different. A first cross-section of the FEC-encoded segment data contained within the FEC-encoded blocks resident in the first encoder channel is added to a first transmit block T.sub.0. Similarly, A first cross-section of the FEC-encoded segment data contained within the FEC-encoded blocks resident in the second encoder channel is added to a second transmit block T.sub.1. The first and second transmit blocks are then communicated to the receiver.

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Concepts associés (32)
Error correction code
In computing, telecommunication, information theory, and coding theory, forward error correction (FEC) or channel coding is a technique used for controlling errors in data transmission over unreliable or noisy communication channels. The central idea is that the sender encodes the message in a redundant way, most often by using an error correction code or error correcting code (ECC). The redundancy allows the receiver not only to detect errors that may occur anywhere in the message, but often to correct a limited number of errors.
Code correcteur
vignette|Pour nettoyer les erreurs de transmission introduites par l'atmosphère terrestre (à gauche), les scientifiques de Goddard ont appliqué la correction d'erreur Reed-Solomon (à droite), qui est couramment utilisée dans les CD et DVD. Les erreurs typiques incluent les pixels manquants (blanc) et les faux signaux (noir). La bande blanche indique une brève période pendant laquelle la transmission a été interrompue.
Hybrid automatic repeat request
Hybrid Automatic Repeat reQuest (hybrid ARQ ou HARQ) est une technologie qui permet la transmission fiable de données sur un canal de communication qui peut engendrer des erreurs de transmission. HARQ combine les principes de la retransmission, Automatic Repeat Request (ARQ), et de la correction d'erreurs, Forward Error Correction (FEC). Dans le cas d'un simple ARQ, des bits redondants sont ajoutés aux données à transmettre pour permettre au récepteur de détecter d'éventuelles erreurs de transmission, par exemple au moyen d'un contrôle de redondance cyclique.
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