Method to minimize degradation in a D-MPSK hierarchical modulation system
US7830983B2 · kind B2 · utility
2Cited by
22References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 1, 2005 |
| Grant date | Nov 9, 2010 |
| Priority date | — |
| Expiry date | May 18, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/3488
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention provides a method to minimize degradation in a D-MPSK hierarchical modulation system by adding additional data throughput (i.e., secondary information) as an offset to the primary signal transmitted by a SDARS terrestrial repeater. The present invention provides techniques for adding the additional throughput as Level 2 data by transmitting offset phase and/or amplitude information across adjacent OFDM symbols and/or adjacent frequency subcarriers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.