Nested symbol constellations representing respective services for graceful degradation in the presence of noise
US9420224B2 · kind B2 · utility
1Cited by
2References
13Claims
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Key dates
| Filing date | Mar 6, 2014 |
| Grant date | Aug 16, 2016 |
| Priority date | — |
| Expiry date | Dec 27, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/814
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Symbols representing different classes of service are assigned to different modulation schemes so that the most important service (e.g., emergency messaging) can have the most robust performance, the next important service (e.g., audio) can have robust performance and so on including various grades of video (e.g., HDTV, SDTV) becoming available with decent received RF signal power. The separate modulation constellation points can be scaled to fit inside popular square constellation points to aide receiver synchronization. In this way, graceful degradation of service is afforded in the presence of noise in the channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.