![]() In accordance with this invention the satellite communication system further includes a closed loop power control system comprising a plurality of inner loops, individual ones of which operate to compensate one of the user links for communication signal impairments occurring at least between the user terminal and the at least one satellite communication repeater, and an outer loop which operates to compensate all of the user links for feeder link impairments occurring between the at least one ground station and the at least one satellite communication signal repeater. A next step adjusts a transmitted power of the uplink reference signal in accordance with the determined amount of attenuation so as to substantially compensate for the attenuation.įurther in accordance with this invention there is provided a satellite communication system that includes at least one satellite communication signal repeater at least one ground station for transmitting a feeder link comprised of a plurality of communication signals to the at least one satellite communication signal repeater and a plurality of user terminals each receiving one of the communication signals over a user link from the at least one satellite communication signal repeater. A next step receives the downlink reference signal and determines from the received downlink reference signal an amount of attenuation that was experienced at least by the uplink reference signal between the ground station and the satellite. The downlink reference signal is transmitted with a power that is a function of the power of the received uplink reference signal. The second frequency is less than the first frequency and is not significantly impaired or attenuated by the rain cell. A next step receives the reference signal with the satellite and repeats the reference signal with a second frequency as a downlink reference signal that is transmitted from the satellite. The uplink reference signal experiences an attenuation between the ground station and the satellite due to, by example, a rain cell. A first step transmits an uplink reference signal with a first frequency from the ground station to the satellite. In accordance with a method of this invention for operating a satellite communication system having at least one satellite and at least one ground station, the following steps are executed. This invention is directed to a satellite communication system, and a method executed by same, for providing adaptive closed loop power control. H04W84/06- Airborne or Satellite Networks.H04W84/04- Large scale networks Deep hierarchical networks.paging networks, cellular networks, WLAN or WLL H04W84/02- Hierarchically pre-organised networks, e.g.for establishing or releasing a connection for adaptation of transmission parameters, e.g. H04B7/18543- Arrangements for managing radio, resources, i.e.for establishing or releasing a connection ![]() ![]() H04B7/18539- Arrangements for managing radio, resources, i.e.H04B7/1853- Satellite systems for providing telephony service to a mobile station, i.e.H04B7/185- Space-based or airborne stations Stations for satellite systems.H04B7/00- Radio transmission systems, i.e.H04W52/14- Separate analysis of uplink or downlink.Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by Globalstar LP filed Critical Globalstar LP Publication of EP0748066A2 publication Critical patent/EP0748066A2/en Publication of EP0748066A3 publication Critical patent/EP0748066A3/en Status Withdrawn legal-status Critical Current Links Original Assignee Globalstar LP Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Sites Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Withdrawn Application number EP96303287A Other languages German ( de) Google Patents Closed loop power control for low earth orbit satellite communications systemÄownload PDF Info Publication number EP0748066A2 EP0748066A2 EP96303287A EP96303287A EP0748066A2 EP 0748066 A2 EP0748066 A2 EP 0748066A2 EP 96303287 A EP96303287 A EP 96303287A EP 96303287 A EP96303287 A EP 96303287A EP 0748066 A2 EP0748066 A2 EP 0748066A2 Authority EP European Patent Office Prior art keywords satellite reference signal uplink signals downlink Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents EP0748066A2 - Closed loop power control for low earth orbit satellite communications system EP0748066A2 - Closed loop power control for low earth orbit satellite communications system
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