Alcatel Lucent

Alcatel

Atc Technologies, Inc.

Alcatel Espace

Thales Alenia Space France

Michel Cohen

Joseph Blineau

Nicolas Chuberre

Denis Rouffet

Erwan Corbel

Emmanuel Lemois

Olivier Courseille

Arif Ansari

Regis Duval

Christian Le Floch

Jean-Michel Bories

Laurent Cuvelier

Anne Magnier

Gerald Sebastien

Régis Duval

A terrestrial repeater, comprising i) an interface means configured to receive a first data stream originating from a first satellite transmission network, a second data stream originating from a second transmission network, and a third data stream originating from a third terrestrial transmission network, and to transform the received streams into data packets; ii) a first processing means configured to select at least one part of the data packets of at least one of the first, second, and third streams received, and to process each selected stream portion to place the data packets it comprises into a selected broadcast format; and iii) a second processing means configured to combine the selected and processed stream portions to constitute a set of packets to be broadcast, convert the set of packets into at least one radio frequency signal, and amplify the at least one radio frequency signal in order to broadcast wirelessly towards at least one radio communication terminal.

Multiple entry terrestrial repeater for a content broadcasting system

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 (E-E) tasked with retransmitting received user signals to user terminals (T, T), 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 (E-E) 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 (T, T) at roughly the same time.

Method for synchronzing user signal transmissions within a hybrid communication network

Methods for controlling orthogonal frequency division multiple access (OFDMA) communications over satellite links. The methods include estimating a differential delay in a satellite spotbeam between a mean propagation delay in the spotbeam and a propagation delay between a user terminal in the spotbeam and a satellite, estimating an overlap between an OFDMA uplink frame and an OFDMA downlink frame as a result of the differential delay, and providing a guard band in the OFDMA uplink frame and/or the OFDMA downlink frame to reduce an overlap between remaining portions of the OFDMA uplink frame and the OFDMA downlink frame other than the guard band. Corresponding systems and devices are also disclosed.

Systems and methods for orthogonal frequency division multiple access (OFDMA) communications over satellite links

In a radiocommunications system having physical channels each including at least one logical channel, the invention proposes transmitting both the means for acquiring and tracking synchronization and the system information addressed to user stations in a single logical channel referred to as the &ldquo;synchronization&rdquo; channel. For this purpose, the synchronization channel carries a repeated detection word ( ) together with system information ( ) between repeats of the detection word. The system information is subjected to spreading prior to being transmitted over the synchronization channel. The invention makes it possible to limit the amount of system resources that are devoted to providing the functions of synchronization and of broadcasting system information.

Module channel for acquiring and tracking in a radio communication system

The invention provides a method of switching a call set up between a first station and a second station from a current propagation path to a following propagation path. The method includes the following steps:

Method of switching a channel from a first propagation path to a second

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Paris, France

Michel Cohen