Apparatus and method for processing a Quadrature Amplitude Modulated (QAM) signal
US5966412A · kind A · utility
169Cited by
6References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1997 |
| Grant date | Oct 12, 1999 |
| Priority date | — |
| Expiry date | Jun 30, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/38
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Apparatus and method for receiving a QAM signal using a backward compatible hierarchical coding scheme to increase data transmission using finer constellations, while maintaining compatibility with existing Direct Broadcasting Satellite (DBS) systems. The apparatus employs multiple stages of decoders such that the finer constellations of the QAM signal are unraveled at different stages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.