Method and apparatus for forward error correction in a content distribution system
US7451361B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 13, 2005 |
| Grant date | Nov 11, 2008 |
| Priority date | — |
| Expiry date | Feb 6, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2001/0098
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Method and apparatus for encoding transport stream packets is described. In one example, frames of transport stream packets are block coded to produce block coded symbols. The block coded symbols are interleaved for each of the frames using convolutional interleaving to produce interleaved data. The interleaved data is randomized. The interleaved data is set partitioned for each of the frames into un-coded bits and bits to be encoded. For each of the frames: A low density parity check (LDPC) code is applied to the bits to be encoded to generate a codeword having information bits and parity bits. Groups of interleaved bits are generated from bits in the codeword. Symbols formed from the groups of interleaved bits and the un-coded bits are mapped to points in a quadrature amplitude modulation (QAM) constellation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.