Method and apparatus for forward error correction in a...

Details Method and apparatus for forward error correction in a... Method and apparatus for forward error correction in a...

2005-11-23

2009-06-30

Chaudry, M. Mujtaba K (Department: 2112)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S801000

Reexamination Certificate

active

07555696

ABSTRACT:
Method, apparatus, and computer readable medium for forward error correction (FEC) in a content distribution system is described. One aspect of the invention relates to encoding frames of content. In one example, each frame is set partitioned into un-coded bits and bits to be encoded. For each frame, parity bits are computed for the bits to be encoded using low density parity check (LDPC) coding to generate a codeword having information bits and the parity bits. Groups of interleaved bits from the information bits in the codeword are generated. Symbols formed from the bit groups and the un-coded bits are pseudorandomly interleaved. The symbols are then mapped to points in a quadrature amplitude modulation (QAM) constellation.

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