Packet transmission of digital signals over a high capacity channel, particularly over a satellite broadcasting channel
US4821261A · kind A · utility
4Cited by
5References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 30, 1986 |
| Grant date | Apr 11, 1989 |
| Priority date | — |
| Expiry date | Jul 30, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/083
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
For full time transmission of digital signals, in the form of successive bits, over a satellite broadcasting channel, two multiplexes each having a bandwidth substantially half that of the channel are transmitted on two quadrature carriers, with four phase type modulation and with symbols offset on the two carriers. At reception one of the multiplexes is demodulated by phase demodulation, phase differential demodulation or phase coherent demodulation, with physical separation of one binary element out of two.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.