Method for establishing DAMA radiotelephone conversations by single-span satellite transmission
US4424417A · kind A · utility
36Cited by
4References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1981 |
| Grant date | Jan 3, 1984 |
| Priority date | — |
| Expiry date | Jul 31, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/18528
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a radiotelephone system comprising a ground central station and a plurality of peripheral stations having access to a geostationary satellite, demand-assignment multiple-access (DAMA) conversations are established by single-span transmission between subscribers of the peripheral stations. In order to prevent conflicts arising from two simultaneous call demands, a rectangular-wave synchronization signal is transmitted by the central station to the peripheral stations in a specialized channel and the demands are caused to coincide with the active wavefronts of the synchronization signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.