Abrégé

A device for receiving a broadband multi-channel radiofrequency signal includes a radiofrequency analog input stage connected to an intermediate-frequency conversion stage. The conversion stage includes at least one conversion chain having a frequency mixer that transposes the signal to an intermediate frequency connected to the input of an analog-digital converter with a high frequency sampling rate. The intermediate and sampling frequencies in each conversion chain are selected such that, considering the noise generated by the sampling overtones of the corresponding analog-digital converter, each of the radiofrequency signal channels has a signal/noise ratio that is greater at output than a predetermined value of at least one conversion chain.

Classes IPC  ?

• H03D 7/16 - Changement de fréquence multiple
• H04B 15/06 - Réduction des perturbations parasites dues aux appareils électriques avec des moyens disposés sur ou à proximité de la source de perturbation la perturbation étant causée par des ondes essentiellement sinusoïdales, p. ex. dans un récepteur ou un enregistreur à bande magnétique par des oscillateurs locaux des récepteurs
• H04B 1/10 - Dispositifs associés au récepteur pour limiter ou supprimer le bruit et les interférences

Abrégé

A gateway server includes a first subsystem including a media level, a communication level and a control level; a microkernel; an IPC controller configured to manage communication between the server resources allocated to the first subsystem a second subsystem including a second media level, a second communication level and a second control level such that the microkernel and the IPC controller also manage communication between the server resources allocated to the second subsystem; and a memory with shared reading and writing, established under the control of the microkernel and the IPC controller, between the control level of the first subsystem and the control level of the second subsystem.

Classes IPC  ?

• G06F 15/167 - Communication entre processeurs utilisant une mémoire commune, p. ex. boîte aux lettres électronique
• H04L 29/06 - Commande de la communication; Traitement de la communication caractérisés par un protocole
• G06F 21/53 - Contrôle des utilisateurs, des programmes ou des dispositifs de préservation de l’intégrité des plates-formes, p. ex. des processeurs, des micrologiciels ou des systèmes d’exploitation au stade de l’exécution du programme, p. ex. intégrité de la pile, débordement de tampon ou prévention d'effacement involontaire de données par exécution dans un environnement restreint, p. ex. "boîte à sable" ou machine virtuelle sécurisée
• G06F 9/54 - Communication interprogramme
• H04L 29/08 - Procédure de commande de la transmission, p.ex. procédure de commande du niveau de la liaison
• H04L 12/46 - Interconnexion de réseaux
• G06F 11/20 - Détection ou correction d'erreur dans une donnée par redondance dans le matériel en utilisant un masquage actif du défaut, p. ex. en déconnectant les éléments défaillants ou en insérant des éléments de rechange

Abrégé

A method of securing a computer comprising a microkernel and a system for interfacing with at least one virtualized operating system are presented. The microkernel includes a clock drive, a scheduler and an inter-process communication manager. The system for interfacing forms at least one virtual machine associated with each operating system and allows execution of the latter without modification. The method includes, at the level of the system for interfacing, the steps of:—intercepting any communication between a means external to the operating system and the operating system,—verifying that predefined rules of access to said external means are validated by said communication;—transmitting the communication to the recipient if the rules are validated.

Classes IPC  ?

• H04L 29/06 - Commande de la communication; Traitement de la communication caractérisés par un protocole
• G06F 21/00 - Dispositions de sécurité pour protéger les calculateurs, leurs composants, les programmes ou les données contre une activité non autorisée

Abrégé

The invention relates to a gateway server (27) provided with a first subsystem including a media level (22), a communication level (24) and a control level (26), said server (27) also including a microkernel (38) and an IPC controller (25) managing communication between the server resources allocated to the first subsystem (22, 24, 26), characterised in that said server includes: a second subsystem (32, 34, 36), including a second media level (32), a second communication level (34) and a second control level (36) such that the microkernel (38) and the IPC controller (25) also manage communication between the server resources allocated to said second subsystem (22, 24, 26); and a memory (29) with shared reading and writing, established under the control of the microkernel (38) and the IPC controller (25), between the control level of the first subsystem (22, 24, 26) and the control level of the second subsystem (22, 24, 26).

Classes IPC  ?

• H04L 29/06 - Commande de la communication; Traitement de la communication caractérisés par un protocole
• H04L 29/08 - Procédure de commande de la transmission, p.ex. procédure de commande du niveau de la liaison
• G06F 9/46 - Dispositions pour la multiprogrammation

Abrégé

The invention relates to a method for emitting messages in order to guarantee the authenticity of the system that emitted said messages. The method includes the following steps, namely: a step comprising the selection of a threshold value used in a threshold-based cryptographic scheme, which value is greater than or equal to 1; - a step comprising the generation of a set of partial information items, such that knowledge of a number i, greater than or equal to the threshold value K, of partial information items can be used to verify a signature of at least part of the messages; and a fourth step comprising the sending of each partial information item separately in a distinct message. The invention also relates to a device for emitting messages for guaranteeing the authenticity of the system that emitted the messages, as well as to a method and a device for verifying the authenticity of such a system. In particular, the invention is suitable for global satellite-based radiocommunication and radionavigation systems.

Classes IPC  ?

• H04L 9/32 - Dispositions pour les communications secrètes ou protégéesProtocoles réseaux de sécurité comprenant des moyens pour vérifier l'identité ou l'autorisation d'un utilisateur du système

Abrégé

A terminal exhibits at least one functionality made secure on the basis of a security item. A security entity stores said security item as well as first authentication parameters. The terminal stores second authentication parameters. At the level of the terminal, an authentication of the security entity is performed (11) on the basis of the first and second authentication parameters. Next, a secure contactless link is established (12) with the security entity. Finally, the security item stored on said security entity is received (23) in the course of said secure link.

Classes IPC  ?

• H04L 9/32 - Dispositions pour les communications secrètes ou protégéesProtocoles réseaux de sécurité comprenant des moyens pour vérifier l'identité ou l'autorisation d'un utilisateur du système

Abrégé

The invention relates to a device for receiving a broadband multi-channel radiofrequency signal, consisting of a radiofrequency analog input stage (3) connected to an intermediate-frequency conversion stage (δ), said conversion stage comprising at least one conversion chain (13, 15) comprising a frequency mixer (17, 19) that transposes the signal to an intermediate frequency connected to the input of an analog-digital converter (29, 31) with a high frequency sampling rate, characterized in that the intermediate and sampling frequencies in each conversion chain are selected such that, considering the noise generated by the sampling overtones of the corresponding analog-digital converter, each of the radiofrequency signal channels has a signal/noise ratio that is greater at output than a predetermined value of at least one conversion chain.

Classes IPC  ?

• H04B 15/06 - Réduction des perturbations parasites dues aux appareils électriques avec des moyens disposés sur ou à proximité de la source de perturbation la perturbation étant causée par des ondes essentiellement sinusoïdales, p. ex. dans un récepteur ou un enregistreur à bande magnétique par des oscillateurs locaux des récepteurs
• H04B 1/16 - Circuits
• H04B 7/12 - Diversité de fréquence

Abrégé

The invention comprises managing the identity of a user to be associated with a terminal (11) adapted for communication in a communication network that provides a service based on the identity of the user. A contactless transaction is established at the terminal with an identification entity (12). During the transaction, a piece of information on the identity of the user stored in the identification entity is received. Finally, the identity of the user obtained from said information is stored. It is also provided that the identity of the user is erased at the terminal when the terminal is subjected to a specific action. 

Classes IPC  ?

• H04L 29/06 - Commande de la communication; Traitement de la communication caractérisés par un protocole
• H04W 12/02 - Protection de la confidentialité ou de l'anonymat, p. ex. protection des informations personnellement identifiables [PII]
• H04L 9/32 - Dispositions pour les communications secrètes ou protégéesProtocoles réseaux de sécurité comprenant des moyens pour vérifier l'identité ou l'autorisation d'un utilisateur du système
• H04N 1/44 - Systèmes à secret

Abrégé

The invention relates to a method of producing a proof of presence of an entity in a zone for a duration greater than a presence threshold and an electronic monitoring system. The method comprises a step of successive sendings of messages generated from a secret. The secret can be reconstituted on the basis of a number of messages that is greater than or equal to a threshold. Each message is sent over a period whose duration is chosen in such a way that the product of the duration of the send period times the threshold is substantially equal to the presence threshold. The method comprises a step of comparing the secret and a secret candidate generated from the messages received by the entity. The proof is produced only if the secret and the secret candidate are equal. The invention also relates to an electronic monitoring system. In particular, the invention applies to the tracking of persons under conditional freedom or in a probationary situation, or else to the generation of proofs of reliability and of availability of devices.

Classes IPC  ?

• G07C 1/10 - Enregistrement ou indication de l'heure d'un événement ou d'un temps écoulé, p. ex. horodateurs pour la main-d'œuvre combinés avec l'enregistrement ou l'indication d'autres données, p. ex. de signes d'identification
• H04M 15/00 - Dispositions de comptage, de contrôle de durée ou d'indication de durée

Abrégé

The invention relates to a method of optimizing a data link between a mobile station sending an up-going signal and a base station sending a down-going signal. The method comprises steps of receiving the up-going and down-going signals; a step of decoding the data and protocol information of the frames of the down-going signal; a step of decoding the data and protocol information of the frames of the up-going signal, with the aid of the information emanating from the decoding of the down-going signal; a step of transmitting, to the base station, data and protocol information extracted on completion of the decoding of the previous step. The invention also relates to a wideband radiocommunication system, and a complementary receiving station. It is applied to professional mobile radiocommunications systems.

Classes IPC  ?

• H04B 7/26 - Systèmes de transmission radio, c.-à-d. utilisant un champ de rayonnement pour communication entre plusieurs postes dont au moins un est mobile

Abrégé

To reduce interference in signals (r1, r2) received by a receiver through a propagation channel, each comprising symbols distributed according to frequency and time dimensions and corresponding to one and the same signal emitted, the receiver weights an estimate (d) of the signal emitted and the signals received by weighting vectors (w1, W2, wd) evolving in vector subspaces representing the frequency variations and time variations of the channels for propagating the signals between an emitter and the receiver. These vector subspaces are defined by matrices some of whose columns are deleted according to frequency and time constraints of the channel. The receiver minimizes a function of the difference between the sum of weighted signals received and the weighted estimate of the signal emitted so as to estimate the signal emitted as a function of the weighting vectors and of the signals received.

Classes IPC  ?

• H04L 1/06 - Dispositions pour détecter ou empêcher les erreurs dans l'information reçue par réception à diversité utilisant la diversité d'espace
• H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p. ex. réseaux de mise en forme adaptatifs
• H04B 7/08 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station de réception
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission

Abrégé

The invention relates to a method for establishing a call between a first access point and a second access point, by means of a network for multipoint broadcasting. The method comprises a step for attribution (20) of a multipoint address to the call, a step for communication (30) of the multipoint address to the points of access and a step for inscription (40) of the access points at the multipoint address. The access points subsequently send all the media data for the call to the multipoint address. The invention further relates to a call server and a mobile radiocommunication system which permits third parties to join conversations initiated between two parties. In particular the invention relates professional mobile radiocommunication systems.

Classes IPC  ?

• H04L 12/28 - Réseaux de données à commutation caractérisés par la configuration des liaisons, p. ex. réseaux locaux [LAN Local Area Networks] ou réseaux étendus [WAN Wide Area Networks]

Abrégé

A radio communication transmitter (EM) comprises at least two antennas (AE1, AE2) for transmitting a signal containing encoded bits which are converted into distributed symbols according to subcarriers and time intervals. The transmitter encompasses a signal splitter (REP) for splitting all the symbols of the signal into as many separate subsets (SEi) of signal symbols as the transmitter has antennas, each subset being allocated to one of the antennas and the combined subsets amounting to all the symbols of the signal. The symbols are split into at least two subsets during a time interval of the signal or for a subcarrier. The antennas each synchronously transmit the subsets of symbols. The subsets of symbols can comprise a number of substantially identical symbols to reduce a difference between peaks of strength and the average strength of the signal transmitted by each antenna.

Classes IPC  ?

• H04B 7/06 - Systèmes de diversitéSystèmes à plusieurs antennes, c.-à-d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station d'émission
• H04L 1/06 - Dispositions pour détecter ou empêcher les erreurs dans l'information reçue par réception à diversité utilisant la diversité d'espace
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples

Classes IPC  ?

• H03M 7/30 - CompressionExpansionÉlimination de données inutiles, p. ex. réduction de redondance

Abrégé

An identifier (IDp) designates a group of terminals accessible via the network (RP) by packets having a multicast address as destination address. An equipment (EIm) between the network and a terminal (Tn) belonging to a group calculates the multicast address of the group using a function depending on the identifier (IDp) of the group each time that a packet including a message transmitted by the terminal is to be transmitted to the network. The equipment also calculates a group identifier (IDp) using a function depending on a multicast address extracted each time that a packet transmitted from the network is received by the equipment in order to transmit a message content extracted from the packet to be received by the terminal if the calculated group identifier is identical to the identifier of the group to which the terminal belongs. No table of mappings between the identifiers of the groups and the multicast addresses is stored in the equipment.

Classes IPC  ?

• H04L 12/18 - Dispositions pour la fourniture de services particuliers aux abonnés pour la diffusion ou les conférences