Abstract: A method for estimating the movement of a terminal of interest with respect to an access network. An incoming frequency of a message of interest transmitted by the terminal of interest and received by a pair of base stations of the access network are measured. The incoming frequencies of calibration messages transmitted by calibration terminals and received by the pair of base stations are measured. A differential measurement error according to the incoming frequencies of the calibration messages is estimated. A difference in incoming frequency of the message of interest according to the incoming frequencies of the message of interest and according to the differential measurement error is estimated. The movement of the terminal of interest according to the difference in incoming frequency of the message of interest is estimated.

Abstract: A method for transmitting and receiving a broadcast signal by an access network to a plurality of terminals of a two-way wireless communication system. An information signal is formed from the broadcast information destined for the terminals. A pilot signal is formed and a broadcast signal including the information signal SI1 and the pilot signal is transmitted. The information signal and the pilot signal are transmitted on different respective central frequencies having a predefined frequency gap.

Abstract: A method for transmitting, by a terminal of a wireless communication system, uplink messages on an uplink to an access network. A sequence of NR uplink messages is formed. Each uplink message of the sequence includes a same useful data packet and control data having an identifier for identifying the uplink message from the NR uplink messages of the sequence. The uplink messages of the sequence are transmitted on different respective center frequencies. Also, a method for transmitting, by the access network, a downlink message in response to the sequence of uplink messages, on a center frequency determined from the measured center frequencies of the uplink messages of the sequence.

Abstract: A method is provided for transmitting a signal by a transmitter device to a satellite moving in orbit around the Earth, the transmitter device and the satellite including wireless telecommunication means. The method includes receiving, by the transmitter device, a signal transmitted by the satellite, termed the presence signal, analyzing a frequency shift induced by the Doppler effect on the presence signal received by the transmitter device, estimating a later change over time of the frequency shift starting from a later predetermined time of the beginning of transmission of the signal to be transmitted by the transmitter device and over a predetermined duration of the signal to be transmitted, and precompensating the later change over time estimated from the frequency shift on the signal to be transmitted.

Abstract: A method for transmitting broadcast signals from a group of base stations to terminals of a wireless communication system. Each base station having a coverage area. The coverage areas of the base stations of the group are distributed geographically such as to serve a geographical area. Since the broadcast signals are of limited duration and are transmitted in a frequency band used by all of the base stations of the group, the base stations of the group are time-synchronized in relation to one another. The broadcast signals from the base stations of the group are time-multiplexed. In addition, the wireless communication system has multiple geographical regions. Each region includes multiple groups of base stations), and the broadcast signals of different geographical regions are time-multiplexed.

Abstract: A method allowing a receiver device of a wireless communication system to receive a useful signal emitted by an emitter device. The useful signal corresponding to a signal, the phase or frequency of which is modulated by a sequence of two-state symbols corresponding to a sequence of binary data. A temporal envelope of the useful signal is detected and compared to a preset threshold value. Transitions between consecutive useful-signal symbols are detected, on the basis of the result of the comparison. A sequence of binary data is extracted from the useful signal depending on the detected transitions.

Abstract: A wireless communication method between a plurality of terminals and an access network. The access network is configured to transmit downlink messages on a downlink in reply to uplink messages transmitted by the terminals. The access network includes a plurality of half-duplex base stations. Each terminal waiting for a downlink message in reply to a transmitted uplink message is configured to listen to the downlink in a listening window, the duration of which is at least five times that of the downlink message. The method includes the steps of determining if listening windows of terminals overlap. When an overlap allows the transmission of several downlink messages by a single base station, the downlink messages are transmitted grouped together in a single transmission window of the base station.

Abstract: Apparatus includes an antenna to emit and/or receive radioelectric signals and a strap configured to fasten the apparatus. The antenna includes an antenna loop. The antenna loop includes a conducting plate and a case containing an electronic circuit and having at least one conducting face which extends parallel opposite the conducting plate. The conducting plate and the conducting face of the case are connected electrically together on one side of the conducting face of the case and on the other side are connected electrically with the electronic circuit. The strap includes a conductive portion forming an antenna ground of the antenna and electrically insulated from the conductive plate. The conducting portion of the strap is in capacitive coupling with the conducting plate.

Abstract: A method of communication between an access network and terminals. The access network includes half-duplex base stations, in which, when a downlink message is to be sent, in the course of a predetermined time interval, to a terminal that has sent an uplink message received by several base stations. Reception loads associated respectively with a group of base stations that have received the uplink message sent by the terminal are obtained. Each reception load being representative of a probability of reception, by the corresponding base station, of an uplink message in the course of the time interval. A base station is selected from among the base stations of the group, as a function of the reception loads obtained. The downlink message is transmitted by the selected base station.

Abstract: A method for transmitting a downlink message on a downlink between an access network and a plurality of terminals. The downlink message includes main data to be transmitted to a receiving terminal. Error detection data is generated from the main data. Main data and/or error-detection data are modified on the basis of an identifier of the receiving terminal, using a predefined reversible modification function. The modification is performed at a constant spectral width and for a constant duration with respect to the aforementioned main data and/or error-detection data. A downlink message including the main data and the error-detection data obtained after modification are transmitted. Also, a method for receiving the downlink messages.

Abstract: A method for analyzing frequency resources within a predetermined multiplexing band. For at least one base station, capabilities for detecting uplink messages respectively in different frequency sub-bands within the multiplexing band are estimated. For each frequency sub-band, a predetermined service quality criterion is assessed depending on the detection capability estimated for the frequency sub-band. A spectral map of service quality for the base station is transmitted. The spectral map is representative of the frequency sub-bands for which the service quality criterion has been verified and the frequency sub-bands for which the service quality criterion has not been verified.

Abstract: An access network for terminals of a digital telecommunications system includes base stations adapted for receiving radiofrequency signals emitted by the terminals, each terminal a physical layer processing module adapted to form a radiofrequency signal on the basis of binary data in accordance with a predefined physical layer protocol. Moreover, for at least one base station, termed the “partial station”, an inverse physical layer processing, making it possible to extract binary data from a radiofrequency signal, is distributed between the partial station and a processing server distinct from the partial station, an inverse physical layer processing module being made up of a first inverse processing module, integrated into the partial station, and a second inverse processing module, integrated into the processing server. The invention also relates to a method of digital telecommunications.

Abstract: A method of searching for the presence of a useful signal of predefined spectral width ?B in a multiplexing band having a spectral width greater than ?B, includes calculating a frequency signal representative of a power spectral density in the multiplexing band, calculating a non-useful signal by filtering the frequency signal by means of a filter capable of suppressing all or part of signals having a spectral width equal to or smaller than ?B, calculating a power ratio signal representative of the ratio of the frequency signal to the non-useful signal, and comparing the power ratio signal with a predefined threshold value. The method may be employed using a computer program product, a receiver unit, and/or a station of a digital telecommunications system comprising such a receiver unit.

Abstract: An access network for terminals of a digital telecommunications system includes base stations adapted for receiving radiofrequency signals emitted by the terminals, each terminal a physical layer processing module adapted to form a radiofrequency signal on the basis of binary data in accordance with a predefined physical layer protocol. Moreover, for at least one base station, termed the “partial station”, an inverse physical layer processing, making it possible to extract binary data from a radiofrequency signal, is distributed between the partial station and a processing server distinct from the partial station, an inverse physical layer processing module being made up of a first inverse processing module, integrated into the partial station, and a second inverse processing module, integrated into the processing server. The invention also relates to a method of digital telecommunications.

Abstract: A method of authenticating data packets transmitted by terminals and received by a station, each terminal successively transmitting data packets in a plurality of different frequency bands according to a frequency hop sequence specific to said terminal, includes, for a data packet received by the station, i) measuring the frequency band in which the considered data packet has been received, ii) extracting an identification code from said considered data packet, iii) determining a theoretical frequency hop according to the frequency hop sequence associated with said extracted identification code, and iv) calculating a frequency hop deviation according to the theoretical frequency hop and to the frequency bands measured for the considered data packet and for the previous data packet. The authentication method includes determining whether data packets have been transmitted by the terminal associated with this identification code according to at least one frequency hop deviation.

Abstract: A method for transmitting useful information between a transmitting terminal and a receiving terminal connected via a transmission channel. The transmitting terminal defines control information for the useful information, and searches in an association table, which is accessible from the transmitting terminal, for a frame-synchronization word associated with the control information. The transmitting terminal generates a frame of data from the useful information, and transmits, over the transmission channel, a data stream that includes the frame-synchronization word and the frame of data.

Abstract: The invention relates to a system for forming an asynchronous communication network for receiving client transmitters, comprising base stations that are remote from one another, said network enabling the geolocation of the client transmitters. For this purpose, the system comprises a plurality of stationary reference transmitters, the positions of which are known and each of which transmits a specific beacon signal in a frequency band included within the frequency band of the network.

Abstract: A method for transmitting data via a terminal to a station of a digital telecommunications system. A first stream of data is encoded in data packets and a second stream of data is encoded in a frequency-hopping pattern. The data packets, in which the first stream of data is encoded, is consecutively transmitted in respective frequency bands of a frequency resource. The frequency bands are determined based on the frequency-hopping pattern in which the second stream of data is encoded.

Abstract: A terminal (10) includes elements for transmitting data towards a station (20) in the form of radio signals, the radio signals being transmitted using a frequency resource (MC) shared between a plurality of terminals (10), characterized in that the terminal is configured to emit radio signals, the instantaneous frequency spectrum of which has a bandwidth (TOB) that is significantly lower than a frequency drift of a frequency synthesis unit of the terminal. Also disclosed are a method for using a frequency resource, a method for manufacturing terminals (10) and a telecommunication system (1).

Abstract: The invention relates to a method for estimating frequency bias negatively affecting a digital signal representative of a symbol frame, wherein said method comprises the steps of: generating the digital signal at a sampling period Te that is shorter than a predefined period of each of the symbols of the frame; calculating values for a plurality of pairs of samples of the digital signal, each value being representative of a phase difference between the samples of a pair; estimating the frequency bias negatively affecting the digital signal on the basis of the values calculated for Np pairs of samples selected such that a plurality of said Np pairs belong strictly to a single symbol in the frame. The present invention also relates to a module for implementing the estimation method, as well as to a telecommunication method and system.