Thales

Patrick Bruas

Marc Touret

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

Method and device making it possible to synchronize a master station and one or more subscriber stations in a wireless communications network, comprising at least one processor disposed at the level of each of the subscriber stations and suitable for calculating each subscriber's transmit time adjustment by taking account of the rate of variation of the satellite-subscriber path, a master station side processor suitable for measuring the loop error and a processor suitable for comparing the value of the error with a threshold value and as soon as the loop error value for a subscriber station is less than or equal to the threshold value, for giving said subscriber station permission to send its traffic.

Method for synchronisation and control in wireless communication systems

The invention relates to a method of optimizing the resources used in a satellite or aircraft telecommunications system (onboard segment). The method includes expressing the difference in consumption Ebetween the consumption of onboard power and the consumption of onboard bandwidth as a function of a plurality of terms including a quality indicator, an informational term expressing onboard parameters and a corrective term. The quality indicator QaF'depends on the antenna system, onboard and on the ground, and on conditions of propagation and interference of the medium. The informational term &#x2111;depends on modem parameters. The term K&#x2032; depends on onboard parameters such as the maximum incoming flux density and the bandwidth. A corrective term Ccharacterizing the consumption of onboard power attributable to the upward noise which is amplified and transposed on board. At least one of the parameters QaF&#x2032;, K&#x2032;, &#x2111;is modified in order to tend toward the cancellation of the absolute value of the term E.

Method of optimizing the resources used in a satellite or aircraft telecommunications system

Method for planning and/or dimensioning links between several stations in a wireless telecommunication system including the following steps:

Tool and method for planning and/or dimensioning satellite telecommunications through a quality indicator

A method and device for determining at least one traffic parameter in a data transmission system including at least one transmitter and one receiver, wherein the receiver includes a modem with equalizer. The method includes determining at least one piece of data given by the equalizer, wherein the piece of data includes the equalization error E; and determining one or more traffic parameters in taking account of the data provided, the fixed quality of service QoS and a relationship linking the quality of service and the equalization error E.

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Livry Gargan, France

Patrick Bruas