Satellite communications system
First Claim
1. A satellite communications system comprising:
- at least one satellite;
at least one ground station each corresponding to one of the at least one satellite, each ground station including a spread spectrum transmitter and a spread spectrum receiver; and
a plurality of mobile terminals, each mobile terminal including a spread spectrum transmitter and a spread spectrum receiver;
wherein the spread spectrum transmitter of the at least one ground station is configured to communicate via the corresponding satellite with the spread spectrum receivers of the mobile terminals and wherein the spread spectrum receiver of the at least one ground station is configured to communicate via the satellite with the spread spectrum transmitter of the mobile terminals, using spread spectrum signals generated from baseband information signals narrower in bandwidth than the spread spectrum signals;
wherein the at least one ground station each includes a radio base station to process signals received by the at least one ground station; and
wherein the at least one ground station each includes a radio network controller configured to set a minimum signal to noise ratio, and wherein each mobile terminal is configured to adjust a power command and send the power command to the radio base station of the ground station via the satellite to adjust a power of the ground station based on the signals received from the ground station and the minimum signal to noise ratio set by the radio network controller.
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Abstract
Embodiments of the present invention are directed to a satellite communications system between satellites and terminal units that are sufficiently small to be handheld units and that operate within the earth power flux density limit. This is accomplished by using spreading spectrum waveform protocols that make efficient use of the allocated bandwidth. In one embodiment, a satellite communications system comprises at least one satellite, and at least one ground station each corresponding to one of the at least one satellite. Each ground station includes a spread spectrum transmitter and a spread spectrum receiver. Each of a plurality of mobile terminals includes a spread spectrum transmitter and a spread spectrum receiver. The spread spectrum transmitter of the at least one ground station is configured to communicate via the corresponding satellite with the spread spectrum receivers of the mobile terminals, and the spread spectrum receiver of the at least one ground station is configured to communicate via the satellite with the spread spectrum transmitter of the mobile terminals, using spread spectrum signals generated from baseband information signals narrower in bandwidth than the spread spectrum signals.
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Citations
24 Claims
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1. A satellite communications system comprising:
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at least one satellite; at least one ground station each corresponding to one of the at least one satellite, each ground station including a spread spectrum transmitter and a spread spectrum receiver; and a plurality of mobile terminals, each mobile terminal including a spread spectrum transmitter and a spread spectrum receiver; wherein the spread spectrum transmitter of the at least one ground station is configured to communicate via the corresponding satellite with the spread spectrum receivers of the mobile terminals and wherein the spread spectrum receiver of the at least one ground station is configured to communicate via the satellite with the spread spectrum transmitter of the mobile terminals, using spread spectrum signals generated from baseband information signals narrower in bandwidth than the spread spectrum signals; wherein the at least one ground station each includes a radio base station to process signals received by the at least one ground station; and wherein the at least one ground station each includes a radio network controller configured to set a minimum signal to noise ratio, and wherein each mobile terminal is configured to adjust a power command and send the power command to the radio base station of the ground station via the satellite to adjust a power of the ground station based on the signals received from the ground station and the minimum signal to noise ratio set by the radio network controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A satellite communication method comprising:
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generating spread spectrum signals from baseband information signals narrower in bandwidth than the spread spectrum signals in a mobile terminal; transmitting the spread spectrum signals generated in the mobile terminal to a satellite; transmitting the spread spectrum signals from the satellite to a ground station; and recovering the baseband information signals from the spread spectrum signals received by the ground station from the satellite; setting a minimum signal to noise ratio in the ground station; adjusting a power command in the mobile terminal to adjust a power of the ground station based on the signals received from the ground station and the minimum signal to noise ratio; and sending the power command from the mobile terminal to the ground station via the satellite. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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24. A satellite communications system comprising:
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at least one satellite; at least one ground station each corresponding to one of the at least one satellite, each ground station including a spread spectrum transmitter and a spread spectrum receiver; a plurality of mobile terminals, each mobile terminal including a spread spectrum transmitter and a spread spectrum receiver; and a core network, wherein the at least one ground station each includes a radio network controller configured to interface with the core network for communication with one or more terrestrial systems; wherein the spread spectrum transmitter of the at least one ground station is configured to communicate via the corresponding satellite with the spread spectrum receivers of the mobile terminals and wherein the spread spectrum receiver of the at least one ground station is configured to communicate via the satellite with the spread spectrum transmitter of the mobile terminals, using spread spectrum signals generated from baseband information signals narrower in bandwidth than the spread spectrum signals.
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Specification