Abstract: Embodiments of the invention provide an optical transmitter configured to transmit a data sequence over at least two spatial propagation modes through an optical transmission channel in a multi-mode optical fiber transmission system, the transmission system being associated with a predefined value of a mode-dependent loss, wherein the optical transmitter comprises: a forward error correcting code encoder (22) configured to encode said data sequence into a codeword vector by applying at least one error correcting code; a modulator (23) configured to determine a set of modulated symbols by applying a modulation scheme to said codeword vector; and a Space-Time encoder (24) configured to determine a codeword matrix by applying a Space-Time code to said set of modulated symbols.

Abstract: Embodiments of the invention provide a Space-Time coding device for encoding a digital data sequence according to a predefined space-time coding rate, said data sequence comprising a set of modulated symbols to be transmitted over at least two propagation modes, during a number of time slots, through an optical transmission channel in a single-core multimode optical fiber transmission system, wherein the device comprises: a codebook generator (53) configured to determine a set of codeword matrices defining a space-time code represented by a space dimension and a temporal dimension, each codeword matrix comprising complex values and a number of columns equal to said code temporal dimension, and a number of rows equal to said code space dimension, the codebook generator (53) being further configured to associate a difference codeword matrix and a distance metric to each pair of codeword matrices among said set of codeword matrices, each component of a difference codeword matrix associated with a given pair o

Abstract: The invention relates to a mode selection method for a system for MIMO transmission on an optical fiber of multimode type. It comprises a step of measuring the transfer matrix of the transmission channel made up of a set of modes of the optical fiber (110), a step of transforming (120) the transfer matrix into a block diagonal matrix, each block being associated with a mode subset, a step of determining (130) the gain and/or the transmission capacity for each of the mode subsets, and a selection (140) of the mode subset corresponding to the highest gain and/or capacity, the MIMO transmission system then using only the modes of the subset thus selected to transmit on the optical fiber. The invention relates also to a core selection method for a system for MIMO transmission on optical fiber of multicore type.

Abstract: The invention relates to a system and a method for transmission over optical fiber (130) with mode or core scrambling. The system comprises a spatio-temporal encoder (110) and a plurality of modulators (1251, . . . , 125n) associated, respectively, with separate propagation modes or cores of said fiber, each modulator modulating a laser beam. Said fiber comprises a plurality of slices (1301, . . . , 130L), an amplifier (140l) being provided between any two consecutive slices of the optical fiber. A mode scrambler (150l) is associated with each amplifier in order to perform a permutation of said modes between at least two consecutive slices.

Abstract: A method and system for cooling an electric motor of a simulation or video game controller that comprises a rotor arranged in a casing, wherein the method comprises a forced air ventilation from the outside of the casing to the inside of the casing by a fan arranged on the rotor and kinetically decoupled from the rotor. As such, cold outside air is recovered and circulates through the coils which constitute the heat source and expulsed to the other end of the motor. There is therefore a homogeneous extraction of the heat from the coils. As the fan is kinetically decoupled from the rotor, the cooling system therefore operates independently of the speed of rotation of the main shaft of the motor.

Abstract: The invention relates to a controller, in particular for video games, capable of operating according to at least a gear selection mode and a brake mode. According to the invention, said controller comprises a support casing, a lever mounted on said support casing and capable of pivoting from a neutral position around at least an axis, and a detector to detect, in the gear selection mode, at least two different positions of the lever obtained by the pivoting thereof from the neutral position and, in the brake mode, an angular value corresponding to a braking force required by a user by the pivoting of the controller lever according to said axis.

Abstract: A transmitter for an optical telecommunication system on a weakly multimode fiber is disclosed. One aspect is a transmitter including an encoder transforming each block of symbols to be transmitted into a code matrix, each element of the matrix being relative to a time of use and to a propagation mode of the weakly multimode fiber. The transmitter can include a plurality of modulators respectively associated with the different propagation modes, each modulator modulating a laser beam during a time of use. Each modulator can modulate a laser beam by use of an element of the corresponding matrix, the elements of the matrix of the code being subjected beforehand to an OFDM modulation upstream of said modulators. Each of the modulated beams can be input into the weakly multimode fiber to propagate therein according to a separate mode.

Abstract: A transmitter and a receiver for an optical telecommunication system of the WDM type are disclosed. In one aspect, the transmitter uses a chromato-temporal encoder which, with each block of symbols to be transmitted, associates a code matrix, where each element of the matrix corresponds to a wavelength and a use of the channel. The transmitter includes multiple modulators, where each modulator modulates a laser beam at a wavelength during a use of the channel by an element corresponding to the code matrix. The beams modulated in this manner are multiplexed in an optical fiber. Another embodiment using both a wavelength and a polarization encoding is also proposed.

Abstract: The invention has for object a game controller having an actuator (2, 102) mobile in rotation in relation to a fixed part (3, 103), in such a way as to simulate a control of the rotation of a steering column of a simulated vehicle. According to the invention, the game controller implements means for detecting the displacement in rotation of the actuator (2, 102) comprising at least one Hall effect or magnetoresistive effect detecting unit, constituted of at least two elements, of which a permanent magnet and a magnetic sensor (24, 124). At least during the rotation of the actuator (2, 102), a first element is integral in rotation with the actuator (2, 102) and a second element is integral in rotation with said fixed part (3, 103).

Abstract: The invention has for object a game controller having an actuator (2, 102) mobile in rotation in relation to a fixed part (3, 103), in such a way as to simulate a control of the rotation of a steering column of a simulated vehicle. According to the invention, the game controller implements means for detecting the displacement in rotation of the actuator (2, 102) comprising at least one Hall effect or magnetoresistive effect detecting unit, constituted of at least two elements, of which a permanent magnet and a magnetic sensor (24, 124). At least during the rotation of the actuator (2, 102), a first element is integral in rotation with the actuator (2, 102) and a second element is integral in rotation with said fixed part (3, 103).

Abstract: The invention relates to a speed controller, in particular for video games, capable of operating according to a sequential mode and a manual mode comprising: a support casing (1), a lever (2) hingeably mounted on said support casing and capable of pivoting from a neutral position, in a longitudinal direction around a transversal axis and in a transversal direction around a longitudinal axis, and detection means for detecting, in the manual mode, at least two different positions of the lever obtained by the pivoting thereof in at least the longitudinal direction from the neutral position and, in the sequential mode, at least two different positions of the lever, characterized in that the detection means are capable of detecting, in the sequential mode, at least two different positions of the lever obtained by the pivoting thereof in the transversal direction from the neutral position.

Abstract: A transmitter for an optical telecommunication system on a weakly multimode fiber is disclosed. One aspect is a transmitter including an encoder transforming each block of symbols to be transmitted into a code matrix, each element of the matrix being relative to a time of use and to a propagation mode of the weakly multimode fiber. The transmitter can include a plurality of modulators respectively associated with the different propagation modes, each modulator modulating a laser beam during a time of use. Each modulator can modulate a laser beam by use of an element of the corresponding matrix, the elements of the matrix of the code being subjected beforehand to an OFDM modulation upstream of said modulators. Each of the modulated beams can be input into the weakly multimode fiber to propagate therein according to a separate mode.

Abstract: A method and apparatus are provided for modulating a binary source sequence including of a plurality of source words to generate modulated symbols. The method implements error-correction encoding of the plurality of source words, implementing one or more encoding modules, each implementing a separate error-correction code to generate a plurality of code words, the source words being encoded in series. The code words are interlaced to generate an interlaced sequence. The interlaced sequence is differentially modulated to generate modulated symbols. Each code word is broken down into at least one group with a number of bits equal to the base-2 logarithm of a number of states of a modulation implemented by the step of differentially modulating. The interlacing step distributes the groups such that two adjacent groups in the interlaced sequence belong to separate code words.

Abstract: The invention relates to a speed controller, in particular for video games, capable of operating according to a sequential mode and a manual mode comprising: a support casing (1), a lever (2) hingeably mounted on said support casing and capable of pivoting from a neutral position, in a longitudinal direction around a transversal axis and in a transversal direction around a longitudinal axis, and detection means for detecting, in the manual mode, at least two different positions of the lever obtained by the pivoting thereof in at least the longitudinal direction from the neutral position and, in the sequential mode, at least two different positions of the lever, characterized in that the detection means are capable of detecting, in the sequential mode, at least two different positions of the lever obtained by the pivoting thereof in the transversal direction from the neutral position.

Abstract: The invention relates to a video game controller (1) having a rotatable actuator (2) with respect to a frame (3), so as to simulate at least one simulated vehicle steering column rotation control.

Abstract: A transmitter and a receiver for an optical telecommunication system of the WDM type are disclosed. In one aspect, the transmitter uses a chromato-temporal encoder which, with each block of symbols to be transmitted, associates a code matrix, where each element of the matrix corresponds to a wavelength and a use of the channel. The transmitter includes multiple modulators, where each modulator modulates a laser beam at a wavelength during a use of the channel by an element corresponding to the code matrix. The beams modulated in this manner are multiplexed in an optical fiber. Another embodiment using both a wavelength and a polarization encoding is also proposed.

Abstract: A joystick biased to return its stick to a neutral position and with compensation of the force applied by the biasing. The joystick has a stick that is moveable in relation to a base at least in rotation around two axes and biasing element mounted between said base and a movable element acting on said stick, tending to return said stick to a neutral position. The joystick further comprises compensator, mounted between the base and the movable element, and applying on the latter a force to compensate at least partially the force applied by the biasing, at least when said stick is located in the vicinity of said neutral position.

Abstract: The invention relates to a mini joystick including a handle which can be moved in relation to a body, in rotation along at least two axes of rotation. According to the invention, such a mini-joystick includes a Hall effect movement detection set including at least one first element interdependent in rotation with said handle and at least one second element fixed in relation to said body, said elements belonging to the group including the sensors and the magnets, delivering at least one item of information regarding the position of said handle, and detection means for detecting at least one push applied onto an upper part of said handle, able to deliver at least one item of control information when a push is applied, whatever the position of said handle in relation to said body.

Abstract: A method and apparatus are provided for modulating a binary source sequence including of a plurality of source words to generate modulated symbols. The method implements error-correction encoding of the plurality of source words, implementing one or more encoding modules, each implementing a separate error-correction code to generate a plurality of code words, the source words being encoded in series. The code words are interlaced to generate an interlaced sequence. The interlaced sequence is differentially modulated to generate modulated symbols. Each code word is broken down into at least one group with a number of bits equal to the base-2 logarithm of a number of states of a modulation implemented by the step of differentially modulating. The interlacing step distributes the groups such that two adjacent groups in the interlaced sequence belong to separate code words.

Abstract: The invention concerns a pedal set (100) for video games or vehicle driving simulation, the pedal set (100) comprising a frame (102) and a pedal (116) which has the ability to move in rotation with respect to the frame (102), the pedal (116) having a supporting areas for a foot. The pedal set (100) being characterised insofar as the frame (102) is designed to take alternatively at least two stable positions on the floor or a support: an initial position, in which seen from the left of the pedal set (100), the pedal (116) pivots anticlockwise under the force produced by the foot; and a second position, in which seen from the left of the pedal set (100), the pedal (116) pivots clockwise under the force produced by the foot. The supporting area of the pedal (116) is, in each position, laid out in such a way as to be positioned roughly at the level of the metatarsal of the foot.