System for transmitting radio signals from mobile terminals to provide space diversity for uplink signals via geostationary communication satellites
First Claim
1. A system for transmission of radio signals comprising;
- a geostationary communication satellite in a particular geostationary orbit about the Earth, at least one terrestrial station and at least one terrestrial mobile terminal, said system including bidirectional transmission links between said geostationary satellite and each of said terrestrial mobile terminals and bidirectional transmission links between said geostationary satellite and each terrestrial station, at least one auxiliary satellite co-located in said particular orbit and a transmission link between each of said terrestrial mobile terminals and each co-located auxiliary satellite and an intersatellite transmission link between each co-located auxiliary satellites and the geostationary communication satellite to form a spatial diversity communication system.
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Abstract
The invention concerns a system for transmission of spatial diversity radio signals via a geostationary main communication satellite and one or more auxiliary satellites "colocated" in the same orbit. The distance between an auxiliary satellite and the main satellite is in the range from 200 km to 400 km. The system includes conventional bidirectional transmission links between terrestrial mobile terminals and the main satellite and between the latter and a terrestrial station. Additionally, unidirectional transmission links are provided between the auxiliary satellites and the main satellite. Applications include a mobile communication service with portable terminals via a geostationary satellite.
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Citations
15 Claims
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1. A system for transmission of radio signals comprising;
a geostationary communication satellite in a particular geostationary orbit about the Earth, at least one terrestrial station and at least one terrestrial mobile terminal, said system including bidirectional transmission links between said geostationary satellite and each of said terrestrial mobile terminals and bidirectional transmission links between said geostationary satellite and each terrestrial station, at least one auxiliary satellite co-located in said particular orbit and a transmission link between each of said terrestrial mobile terminals and each co-located auxiliary satellite and an intersatellite transmission link between each co-located auxiliary satellites and the geostationary communication satellite to form a spatial diversity communication system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
Specification