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公开(公告)号：EP3761524A1
公开(公告)日：2021-01-06
申请号：EP20181831.7
申请日：2018-06-06
IPC分类号： H04B7/204
摘要： The present invention relates to a satellite communication system arranged for consecutively illuminating a plurality of contours on earth and comprising :
- a transmitter to generate a signal to be transmitted and comprising
* encoding means for mapping a sequence of bits, organized into a hopping frame according to a hopping plan, to a sequence of digital symbols,
* modulation means arranged for receiving said sequence of digital symbols and for modulating said digital symbols on a waveform at a symbol rate, thereby obtaining a modulated signal to be transmitted, and for transmission of the modulated signal, said modulation means being arranged for indicating when a next hopping frame is needed,
- a satellite comprising a beam hopping transponder arranged for receiving the modulated signal and for outputting a version of the modulated signal to an illumination circuit arranged in the satellite for steering illumination from one contour to another particular contour according to the hopping plan, said illumination of that one contour starting at a switching time instant,
- one or more receivers in said particular contour of the contours to be illuminated and arranged for receiving the outputted signal,
- a central controller having an established communication link with at least one of the receivers and arranged for receiving via an established link information on observed illumination transitions, said central controller comprising computation means for computing an adjusted symbol rate for the transmitter based on a comparison of the observed illumination transitions with a target switching time instant.-
公开(公告)号：EP4383590A1
公开(公告)日：2024-06-12
申请号：EP22211556.0
申请日：2022-12-06
CPC分类号： H04W52/52 , H04W52/243
摘要： The present invention relates to a method for adjusting transmit power of a terminal transmitter on a return link between the terminal transmitter and a receiver. The terminal transmitter is one of a plurality of terminal transmitters, wherein each terminal transmitter can send one or more data burst signals. The receiver receives a receive signal being an aggregate of versions of the data burst signals sent from the plurality of terminal transmitters. The method comprises:
a) checking on a version of at least one data burst signal comprised in the receive signal, said at least one data burst signal sent from a first terminal transmitter of said plurality, whether a condition is met that the amount of non-linear distortion power with which the version of the at least one data burst signal is impaired, said non-linear distortion resulting from a power amplifier in the first terminal transmitter, is a given number of dB below the amount of noise power with which the version of the at least one data burst signal is impaired, and
b) determining an updated transmit power value for a next data burst signal to be sent from the first terminal transmitter, depending on the outcome of said checking.
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