Method and apparatus for forward error correction in a content distribution system
US7555696B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 23, 2005 |
| Grant date | Jun 30, 2009 |
| Priority date | — |
| Expiry date | Dec 28, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/27
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.