Gray encoding for hierarchical QAM transmission systems
US7079585B1 · kind B1 · utility
34Cited by
4References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 22, 2000 |
| Grant date | Jul 18, 2006 |
| Priority date | — |
| Expiry date | Jan 30, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0048
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A hierarchical QAM system allows the transmission of different sources by embedding the relative constellation points. At the transmitter the constellations generated by the different sources are remapped by a grey coder and then combined. At the receiver, the different source data are decoded by using a corresponding grey code demapper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.