Thales

Marc Touret

Thierry Lucidarme

Antoine Soulie

Michel Delattre

Bertrand Prillard

Patrick Bruas

Jacques Eudes

Yves Guillerme

Jullien Pailler

Thierry Menigand

Marc Coutolleau

Eric Privat

Katy Gourlaouen

Jean-Noël Rozec

Jean-Baptiste Le Stang

Lucie Chiche

Michel Chevallier

Mehdi Hammoudi

Antoine SouliÉ

A method and a system for multi-user transmission in a network, comprising at least on network control center NCC and one or more terminals, wherein the method comprises at least the following steps: determining the number of 4D-TDMA carriers as a function of the number and needs of the terminals, determining the type (SCPC or TDMA) and frequency band Bi of each of the 4D-TDMA carriers as a function of the terminals transmitting on the carriers, for each frame, dividing the band B into PTDMA transmission channels and into PSCPC service channels, each channel consisting of frames comprising a plurality of slots, STDMA slots and SSCPC slots, dynamically allocating a plurality of slots of a 4D-TDMA carrier according to the services required by each terminal, configuring the coding and modulation scheme of each slot by taking account of the quality of the received signals.

Method and system for 4D-TDMA multi-user transmission

In the field of satellite communication systems, a method is provided for managing communication resources allocated by central control equipment to the various terminal communication devices within a global satellite communication system. In particular, the management of communication resources by way of the monitoring of the equivalent isotropically radiated power transmitted by a terminal of the satellite communication system is provided.

Satellite communication device, satellite communication system comprising such a device and method for managing the resources allocated within such a system

A method of emission of a frequency synchronization signal comprises a first step of determining at least two first emission frequencies respectively associated with at least two first intervals separated temporally by a first duration. The first temporal intervals are of identical duration. The first durations are identical for identical first frequencies and the first durations are different for different first frequencies. The method also comprises a second step of emitting at least one synchronization signal in the first temporal intervals and by using the first frequency, the signal emitted in the first intervals being identical.

Synchronization method and system

A communication system using the DVB-S2 standard, and its associated frame structure, comprises at least two users Ui, characterized in that the super-frame STassociated with the first user Uis composed of at least one frame Teach composed of at least one header, of a data part, the said super-frame STcomprising a number dof 'dummy' variable size frames consisting of sslots, the super-frame STassociated with the second user Uis composed of one or more frames Teach composed of at least one header, of a data part, the said super-frame STcomprising a number dof 'dummy' variable size frames consisting of sslots, the system comprises a module NCC adapted for determining the number dand the number dof dummies to be introduced so that the temporal duration of STis equal to the temporal duration of ST

Method and system for synchronization for DVB-S2 frame and its associated frame structure

A satellite transmission system comprises at least: one satellite and two stations comprising transmission means transmitting simultaneously and in the same frequency band a first, high-bit-rate signal and a second, low-bit-rate signal, the second signal allowing changing of frequency of the carrier signal. The station(s) include reception means for receiving simultaneously and in the same frequency band the first and second signal. The system includes means for detecting interference on the frequency band. The transmission means and reception means respectively switch the transmission and reception of the second signal from a low bit rate to a medium bit rate and deactivate the transmission of the first signal in presence of interference, and the transmission means and reception means respectively switch the transmission and reception of the second signal from a medium bit rate to a low bit rate and activate transmission of the first signal in absence of interference.

Satellite transmission system

A system and method for modifying the carrier frequency of first and second signals associated with first and second sequences, respectively, of consecutive time intervals, comprises: first means determining two carrier frequencies respectively associated with each of the two signals based on one time interval or at least two consecutive and continuous time intervals, said time interval(s) belonging to a sequence of consecutive time intervals of known duration; and second means determining a first time interval or at least two first consecutive time intervals belonging to the first sequence, based on a second time interval belonging to the second sequence, by establishing a temporal correspondence between each end of said time interval of said second sequence and an interval of said first sequence including this end. The first means determines said carrier frequencies based on one time interval or at least two consecutive time intervals, belonging to said first sequence.

System for modifying the carrier frequency

The method of transmission between a transmitter and a receiver using a mode of adaptive modulation and coding, wherein the modulation and coding are selected based on the comparison of a characteristic variable of the signal to noise ratio measured by the receiver with a threshold value plus a margin, which margin is variable depending on the prior change in the signal to noise ratio. The margin changes based on a statistical function of a higher order than 1 of the characteristic variable of the signal to noise ratio measured by the receiver over at least one time horizon.

Method of transmission with mechanism for adapting modes of coding and of dynamic range modulation

An antenna system includes at least one antenna and one X-Y mount, said mount being composed of at least three mechanical elements, the first element being a base, the second element being a lower box, the third element being a upper box, the antenna of the system being fixed to the upper box. The components of the antenna downlead are distributed in the various elements composing the X-Y mount, an OMT type junction included in the upper box enabling separation of the components of the downlead into two separate paths, a first path called the ascending path comprising components for amplifying and processing signals to be transmitted by the antenna, a second path called the descending path comprising components for processing and amplifying signals received by the antenna, the components associated with these paths being placed on either side of the various elements of the X-Y mount.

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Gennevilliers, France

Marc Touret