Low cost interoperable satellite digital audio radio service (SDARS) receiver adapted to receive signals in accordance with advantageous frequency plan
US6724827B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 1999 |
| Grant date | Apr 20, 2004 |
| Priority date | — |
| Expiry date | May 25, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/06
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A communications system and method in which first and second carrier frequencies are transmitted from a first transmitter. The first carrier frequency is at a first low end of a band and the second carrier is at a second higher end of the band. Third and fourth carrier frequencies are transmitted from a second transmitter. The third carrier is at the lower end of the band but higher in frequency than the first carrier and the fourth carrier is at the higher end of the band but lower in frequency than the second carrier. Fifth and sixth carrier signals are transmitted from a third transmitter. The fifth carrier signal is higher in frequency than the third carrier signal and the sixth carrier signal is lower in frequency than the fourth carrier signal. In the illustrative embodiment, the first transmitter is located on a first satellite, the second transmitter is located on a second satellite and the third transmitter is located on a terrestrial repeater. The information modulated onto the first, third and fifth carriers is identical such that the first, third and fifth carriers comprise a first ensemble. The information modulated onto the second, fourth and sixth carriers comprise a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.