Cellular/satellite communications system with improved frequency re-use
US5848060A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 21, 1995 |
| Grant date | Dec 8, 1998 |
| Priority date | — |
| Expiry date | Aug 21, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W84/06
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A satellite communications system employs a multiple element antenna for receiving signals on a first frequency band and relaying the signals to a ground station on a second frequency band. The system includes a downconvertor for converting signals received at each of the multiple antenna elements on the first frequency band to corresponding baseband signals, and a multiplexor for time-division multiplexing the corresponding baseband signals to form a multiplexed sample stream. The system also includes a modulator for modulating a carrier in the second frequency band with the multiplexed sample stream and transmitting the modulated carrier to the ground station. In exemplary embodiments, the downconvertor comprise a quadrature downconvertor producing an I and a Q baseband signal. The satellite relays signals received from the ground station using a demultiplexor in a similar manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.