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AssigneeAlcatel Lucent
InventorsJoseph Blineau, Nicolas Chuberre, Michel Cohen, Olivier Courseille
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A method is devoted to synchronizing the transmission of user signals within a single-frequency hybrid network comprising at least one transmission satellite (SAT) and regenerative emitters (E1-E6) tasked with retransmitting received user signals to user terminals (T1, T2), using the same frequency and the same waveform. This method consists of temporally shifting, with respect to a time marker (TM) corresponding to the moment when a chosen element of the user signals arrives at a terrestrial reference arc (RA) from said satellite (SAT), the moment when the user signals received by each emitter (E1-E6) are retransmitted, by a local duration which is a function of the respective positions of the emitter and the satellite (SAT) with respect to a chosen reference position (RP) on said arc (RA), so that the same user signals retransmitted by the satellite (SAT) and the emitter (Ei) reach a user terminal (T1, T2) at roughly the same time.
A method for synchronizing the transmission of user signals for a single-frequency hybrid network comprising at least one transmission satellite (SAT) and emitters (Ei) designed to retransmit received user signals, using the same frequency and the same waveform, to user terminals (Tj), characterized in that it consists of temporally shifting, with respect to a time marker (TM) that corresponds to the moment when a chosen element of the user signals arrived at a terrestrial reference arc (RA) from said satellite (SAT), the moment when the user signals received by each emitter are retransmitted, by a local duration (LDi) which is a function of the respective positions of said emitter (Ei) and said satellite (SAT) with respect to a chosen reference position (RP) on said arc (RA), so that the same user signals retransmitted by said satellite (SAT) and said emitter (Ei) reach a user terminal (Tj) at roughly the same time.
A method for synchronizing the transmission of user signals for a single-frequency hybrid network comprising at least one transmission satellite (SAT) and emitters (Ei) designed to retransmit received user signals, over two different frequencies and the same waveform or a different waveform, to user terminals (Tj), characterized in that it consists of temporally shifting, with respect to a time marker (TM) that corresponds to the moment when a chosen element of the user signals arrives at a terrestrial reference arc (RA) from said satellite (SAT), the moment when the user signals received by each emitter are retransmitted, by a local duration (LDi) which is a function of the respective positions of said emitter (Ei) and said satellite (SAT) with respect to a chosen reference position (RP) on said arc (RA), so that the same user signals retransmitted by said satellite (SAT) and said emitter (Ei) reach a user terminal (Tj) at roughly the same time.
Dependencies are inferred from the claim text.