Patent US5652750A successfully refreshed from Google Patents.
US5652750A
Expired / Lapsed
US
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Optical satellite feeder links
Assignee: Ericsson Inc
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Filing: 1995-08-28
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Granted: 1997-07-29
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Expires: 2015-08-28
Abstract
Abstract A cellular communications satellite system is disclosed which comprises a plurality of ground-based base stations, mobile stations, and at least one orbiting satellite for relaying signals between the base stations and mobile stations. A Plurality of feederlinks are used between the base stations and the satellite for transmitting signals and power from the ground stations to the satellite.
Inventors
- 👤 Paul W. Dent
- 👤 Amer A. Hassan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:32
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/11; H04B10/118; H04B10/80; H04B10/806; H04B10/807; H04B7/00; H04B7/14; H04B7/15; H04B7/185; H04B7/1853; H04B7/18532
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
60 words
A cellular communication system, comprising: a plurality of ground-based base stations; a plurality of mobile stations; at least one orbiting satellite for relaying information signals between said base stations and said mobile stations; and a plurality of feederlinks between said base stations and said satellites for simultaneously transmitting said information signals and power from the ground stations to said satellite.
Claim 2
Dependent Claim
60 words
A cellular communication system, comprising: a plurality of ground-based base stations; a plurality of mobile stations; at least one orbiting satellite for relaying information signals between said base stations and said mobile stations; and a plurality of feederlinks between said base stations and said satellites for simultaneously transmitting said information signals and power from the ground stations to said satellite.
Claim 3
Dependent Claim
14 words
A cellular communication system according to claim 1, wherein said feederlinks are optical feederlinks.
Claim 4
Dependent Claim
14 words
A cellular communication system according to claim 1, wherein said feederlinks are laser beams.
Claim 5
Dependent Claim
17 words
A cellular communication system according to claim 3, wherein said laser beams are low power laser beams.
Claim 6
Dependent Claim
22 words
A cellular communication system according to claim 3, wherein the plurality of laser beams are harmonized at the altitude of the satellite.
Claim 7
Dependent Claim
14 words
A cellular communication system according to claim 1, wherein said base stations are scattered.
Claim 8
Dependent Claim
24 words
A cellular communication system according to claim 1, wherein said satellite uses a steerable laser for a down-feederlink to a central ground-based base station.
Claim 9
Dependent Claim
25 words
A cellular communication system according to claim 7, wherein said satellite further uses a plurality of addition laser for down-feederlinks to alternative ground-based base stations.
Claim 10
Dependent Claim
24 words
A cellular communication system according to claim 1, wherein said satellite uses microwave beams to form a down-feederlink to a central ground-based base station.
Claim 11
Dependent Claim
26 words
A cellular communication system according to claim 1, wherein said satellite uses a plurality of microwave beams to form down-feederlinks to said plurality of base stations.
Claim 12
Independent Claim
96 words
A method for transmitting information from ground-based base stations to an orbiting satellite in a cellular communication system, comprising the steps of: processing information signals intended for at least one mobile station to form drive signals for satellite-borne phased array elements; time multiplexing said drive signals; amplitude or frequency-shift keying said time multiplexed drive signals onto laser beam feederlink signals which are transmitted to said satellite; demodulating said feederlink signals received at said satellite to reconstruct said time multiplexed drive signals; and demultiplexing said drive signals at said satellite using a plurality of distributed demultiplexing circuits.
Claim 13
Independent Claim
96 words
A method for transmitting information from ground-based base stations to an orbiting satellite in a cellular communication system, comprising the steps of: processing information signals intended for at least one mobile station to form drive signals for satellite-borne phased array elements; time multiplexing said drive signals; amplitude or frequency-shift keying said time multiplexed drive signals onto laser beam feederlink signals which are transmitted to said satellite; demodulating said feederlink signals received at said satellite to reconstruct said time multiplexed drive signals; and demultiplexing said drive signals at said satellite using a plurality of distributed demultiplexing circuits.
Claim 14
Independent Claim
92 words
A method for transmitting information from ground-based base stations to an orbiting satellite in a cellular communication system, comprising the steps of: processing information signals intended for at least one mobile station to form drive signals for satellite-borne phased array elements; time multiplexing said drive signals; modulating said time multiplexed drive signals onto microwave feederlink signals which are transmitted to said satellite; demodulating said feederlink signals received at said satellite to reconstruct said time multiplexed drive signals; and demultiplexing said drive signals at said satellite using a plurality of distributed demultiplexing circuits.
Claim 15
Independent Claim
92 words
A method for transmitting information from ground-based base stations to an orbiting satellite in a cellular communication system, comprising the steps of: processing information signals intended for at least one mobile station to form drive signals for satellite-borne phased array elements; time multiplexing said drive signals; modulating said time multiplexed drive signals onto microwave feederlink signals which are transmitted to said satellite; demodulating said feederlink signals received at said satellite to reconstruct said time multiplexed drive signals; and demultiplexing said drive signals at said satellite using a plurality of distributed demultiplexing circuits.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-07-28 | 2001-01-27 | 2001-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-07-28 | 2005-01-27 | 2005-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-07-28 | 2009-01-27 | 2009-07-29 | $7700.00 | Window Closed / Lapsed |