Abstract: A method for detecting buried longitudinal structures using a ground-penetrating radar, the method includes the steps of: acquiring a plurality of radar signals for a region of ground, determining, based on the radar signals, a 3D point cloud, each point corresponding to one radar detection and being geolocated in space, selecting, from the 3D point cloud, at least one set of points comprising a number of points higher than or equal to a minimum detection threshold allowing a longitudinal structure to be characterized, the points of the set being substantially aligned with one another.

Abstract: A method for detecting at least one target buried in an area of the ground, using a ground-penetrating radar, the method includes the steps of: acquiring a measurement of a signal transmitted by each transmitting antenna and reflected in the area of the ground, converting an estimate, into the frequency domain, of the propagation channel for each pair consisting of a transmitting antenna and of a receiving antenna, defining a first hypothesis H0 corresponding to an absence of target in the area of the ground, defining a second hypothesis H1 corresponding to the presence of at least one target in the area of the ground, performing a test of the likelihood ratio between the likelihood of the channel matrix under the second hypothesis H1 and the likelihood of the channel matrix under the first hypothesis H0, in order to conclude whether a target is present at a given position in the area of the ground.

Abstract: This invention relates to an emitter for an optical communication system such as a Li-Fi system. This emitter comprises an M-PAM modulator and a conversion module to convert an M-PAM symbol into a plurality of logical outputs. It also comprises a plurality of branches in parallel, each branch comprising a switched current source mounted in series with the optical source, each switched current source being controlled by a logical output from the conversion module.

Abstract: A method of allocating transmission time slots in an optical wireless system. Resources are allocated taking account of asymmetry of interference diagrams on uplink and downlink and adopting reuse of transmission intervals for each channel, in areas in which there is no interference. In some embodiments, the allocation method allows for relaying between access points through the network to take account of the fact that the access point providing the best uplink (or downlink) can be distinct from the access point associated with the terminal.

Abstract: A method of allocating transmission time slots in an optical wireless system. Resources are allocated taking account of asymmetry of interference diagrams on uplink and downlink and adopting reuse of transmission intervals for each channel, in areas in which there is no interference. In some embodiments, the allocation method allows for relaying between access points through the network to take account of the fact that the access point providing the best uplink (or downlink) can be distinct from the access point associated with the terminal.

Abstract: This invention relates to an emitter for an optical communication system such as a Li-Fi system. This emitter comprises an M-PAM modulator and a conversion module to convert an M-PAM symbol into a plurality of logical outputs. It also comprises a plurality of branches in parallel, each branch comprising a switched current source mounted in series with the optical source, each switched current source being controlled by a logical output from the conversion module.

Abstract: The invention proposes a method for the transmission of data in a cooperative network comprising a source terminal (S), a destination terminal (D) and a relay terminal (R), comprising: in a first transmission (T1), the transmission of the data of a packet by the source terminal (S) to both the relay terminal (R) and the destination terminal (D); in the event of failure (N1) of the destination terminal (D) to successfully decode the data in the packet of the first transmission, and in the case of the data of the first transmission being successfully (O2) decoded by the relay terminal (R), the relay terminal transmits the data of the packet to the destination terminal in a second transmission (T2); in the event of failure (N3) of the destination terminal to successfully decode the data in the packet of the second transmission (T2), selection of the source terminal and/or relay terminal to retransmit the data of the packet to the destination terminal in a third transmission (T3), where the selection may be ba

Abstract: The invention proposes a method for the transmission of data in a cooperative network comprising a source terminal (S), a destination terminal (D) and a relay terminal (R), comprising: in a first transmission (T1), the transmission of the data of a packet by the source terminal (S) to both the relay terminal (R) and the destination terminal (D); in the event of failure (N1) of the destination terminal (D) to successfully decode the data in the packet of the first transmission, and in the case of the data of the first transmission being successfully (O2) decoded by the relay terminal (R), the relay terminal transmits the data of the packet to the destination terminal in a second transmission (T2); in the event of failure (N3) of the destination terminal to successfully decode the data in the packet of the second transmission (T2), selection of the source terminal and/or relay terminal to retransmit the data of the packet to the destination terminal in a third transmission (T3), where the selection may be ba

Abstract: This method for carrying out the flexible demodulation of data modulated following an amplitude modulation in quadrature is used in a communications system employing a code division multiple access technique (CDMA) and an optical frequency division multiplexing (OFDM) using non-binary spread codes. The invention includes steps for determining a simplified expression specific to the logarithm of the likelihood ratio.

Abstract: A method of estimating an SINR ratio of an OFDM-CDMA transmission signal spread with spread codes, the transmission signal being transmitted between a transmission apparatus and a receiver apparatus, the method including: receiving the signal spread with spread codes at the receiver apparatus; and calculating, with a processor at the receiver apparatus, an estimate of the SINR ratio for the signal spread with the spread codes independently of a value of the spread codes.

Abstract: This method for carrying out the flexible demodulation of data modulated following an amplitude modulation in quadrature is used in a communications system employing a code division multiple access technique (CDMA) and an optical frequency division multiplexing (OFDM) using non-binary spread codes. The invention includes steps for determining a simplified expression specific to the logarithm of the likelihood ratio.

Abstract: This invention relates to a method of estimating the SINR ratio of an OFDM-CDMA type transmission using spread codes (ck), in which this ratio is estimated independently of the value of these codes.