Abstract: A transceiving system using a joined modulation alphabet A having a size M the symbols of which are distributed on a plurality N of orthogonal dimensions, the symbols carried by a dimension belonging to a linear sub-alphabet An having a size P, with M=NP. The transmitter performs a turbocoding of a block of information bits, the code words provided by the turbocoder being mapped to symbols of the joined modulation alphabet before modulating the signal to be transmitted. The receiver performs turbodecoding from the projection of the symbols received on the orthogonal dimensions of the alphabet.

Abstract: A method of remote data transmission over a frequency spectrum divided into a plurality of different elementary channels, between a first device and a second device, including the transmission by the first device of a first signal including a succession of first data by modulation of the first data simultaneously over a number of elementary channels of the plurality of elementary channels and the transmission of a second signal representative of a plan of use of the plurality of elementary channels including a succession of second data at least by modulation of all the second data over a single elementary channel from among said number of elementary channels.

Abstract: A method for multiple access to a frequency band of a communication channel of a communication network with carrier sensing and collision avoidance, including a division of the frequency band into a set of request-to-send sub-bands dedicated to the transmission, by source nodes to a destination node, of request-to-send messages for communicating data on the frequency band is provided. The method includes an evaluation of a communication channel load, and, as a function of the result of the evaluation, a re-division of the frequency band to modify the number of sub-bands of the set of request-to-send sub-bands.

Abstract: An FBMC transmission/reception system wherein a phase pre-compensation and an amplitude pre-compensation are done on a block of modulation symbols. The symbol block thus compensated is segmented into a number M of sub-blocks equal to the number of carriers of an FBMC modulator. The sub-blocks are divided into vectors with size N/2 and padded with isolation zeroes to form padded vectors with size N. Each of these padded M is processed by an IFFT to give time sequences to which cyclic prefixes and suffixes are added. The resulting cyclic sequences are then input to the M input channels of the FBMC modulator. The reception symbols can be recovered at the receiver by a simple FFT with size NM/2.

Abstract: A transceiving system using a joined modulation alphabet A having a size M the symbols of which are distributed on a plurality N of orthogonal dimensions, the symbols carried by a dimension belonging to a linear sub-alphabet An having a size P, with M=NP. The transmitter performs a turbocoding of a block of information bits, the code words provided by the turbocoder being mapped to symbols of the joined modulation alphabet before modulating the signal to be transmitted. The receiver performs turbodecoding from the projection of the symbols received on the orthogonal dimensions of the alphabet.

Abstract: A transmitter of an FBMC-MIMO system in which, for each FBMC-OQAM modulator associated with a transmission antenna, the symbols of a block to be transmitted are grouped in pairs, the input symbols in a pair being combined to output first and second combined symbols, the combined symbols being input to the FBMC-OQAM modulator. The invention also relates to a receiver including an FBMC-OQAM demodulator (4101, . . . ,410NR) and an ML detector (450k) from the observables obtained, for each reception antenna. The used ML detection allows for not being affected by intrinsic interference and obtaining a high degree of diversity without increasing the number of antennas.

Abstract: A transmission method and an FBMC transmitter to transmit at least a first and a second block of symbols (X0, X1), each symbols block including a temporal sequence of L vectors with predetermined size N. It uses a first and a second FBMC modulation channel, each FBMC modulation channel being associated with an antenna. During a first use of the channel, the vectors of the first block and the vectors of the second block are input to the first and to the second FBMC modulation channels respectively, in the order of the temporal sequence. During a second use of the channel, the vectors of the first and second blocks are multiplied by a factor jL 1 respectively and ?(jL 1) input to the second and to the first FBMC modulation channels respectively, in the inverse order of the temporal sequence.

Abstract: A method for multiple access to a frequency band of a communication channel of a communication network with carrier sense and collision avoidance, the said frequency band being divided into a set of sub-bands includes, at a source node, detecting the availability of the communication channel and transmitting to a destination node a request message for authorization to send data on the communication channel sent over one or more sub-bands, and, at the destination node, detecting simultaneous request messages for authorization to send data on the communication channel transmitted by a plurality of source nodes over a plurality of sub-bands. A message is transmitted authorizing the sending of data on the communication channel by at least one source node among the said plurality of source nodes.

Abstract: An FBMC transmission/reception system wherein a phase pre-compensation and an amplitude pre-compensation are done on a block of modulation symbols. The symbol block thus compensated is segmented into a number M of sub-blocks equal to the number of carriers of an FBMC modulator. The sub-blocks are divided into vectors with size N/2 and padded with isolation zeroes to form padded vectors with size N. Each of these padded M is processed by an IFFT to give time sequences to which cyclic prefixes and suffixes are added. The resulting cyclic sequences are then input to the M input channels of the FBMC modulator. The reception symbols can be recovered at the receiver by a simple FFT with size NM/2.

Abstract: A method of reception of signals transmitted by a FBMC transmitter using a block Alamouti coding. After demodulation in a base band, the received signal is sampled, with the sample blocks undergoing a sliding FFT before being de-multiplexed towards a first path during a first use of the channel and a second path during a second use of the channel. The vectors received on the first path are multiplied by a first and a second transfer matrix, conjugated to provide first and second vectors. The vectors received on a second path undergo time-reversal and complex conjugation and, if appropriate, multiplication by an imaginary factor, depending on the size of the blocks. The vectors thus obtained are multiplied by first and second transfer matrices to provide third and fourth vectors.

Abstract: The invention relates to a receiver and a FBMC reception method making it possible to reduce the decoding latency time and to increase the data rate in a communication system using a handshake exchange protocol or a TDMA access protocol. The receiver introduces zero padding values in place of the last samples of the last block of samples of a FBMC packet, without waiting for the end of this packet. The decoding of the FBMC packet is thus decoded more rapidly, without significant degradation of the error rate and without reduction of the out-of-band rejection rate of the FBMC signal.

Abstract: A method of reception of signals transmitted by a FBMC transmitter using a block Alamouti coding. After demodulation in a base band, the received signal is sampled, with the sample blocks undergoing a sliding FFT before being de-multiplexed towards a first path during a first use of the channel and a second path during a second use of the channel. The vectors received on the first path are multiplied by a first and a second transfer matrix, conjugated to provide first and second vectors. The vectors received on a second path undergo time-reversal and complex conjugation and, if appropriate, multiplication by an imaginary factor, depending on the size of the blocks. The vectors thus obtained are multiplied by first and second transfer matrices to provide third and fourth vectors.

Abstract: A transmission method and an FBMC transmitter to transmit at least a first and a second block of symbols (X0, X1), each symbols block including a temporal sequence of L vectors with predetermined size N. It uses a first and a second FBMC modulation channel, each FBMC modulation channel being associated with an antenna. During a first use of the channel, the vectors of the first block and the vectors of the second block are input to the first and to the second FBMC modulation channels respectively, in the order of the temporal sequence. During a second use of the channel, the vectors of the first and second blocks are multiplied by a factor jL 1 respectively and ?(jL 1) input to the second and to the first FBMC modulation channels respectively, in the inverse order of the temporal sequence.

Abstract: A quadrature demodulator not requiring analog mixers. The demodulation is made using a first integrator and a second integrator which are controlled by square logic signals at twice the frequency of the carrier, the received signal being alternatively integrated by the first integrator and the second integrator over periods of time equal to a quarter period of time of the carrier frequency. The samples of the first and second integrators are sampled and subtracted from each other. The successive samples are combined in a first and a second combining module for providing in-phase and quadrature component samples. This demodulator can further be provided with a synchronization module IQ and a symbol synchronization module.

Abstract: The invention relates to a multiple access method to a frequency band of a communication channel of a communication network with carrier sensing and collision avoidance, said frequency band being broken down into a set of sub-bands (SB0, SB1, . . . , SBi, . . . , SBn) of the communication channel, characterized in that it comprises at a source node, after it has been detected that the communication channel is available, the transmission to a destination node of several request to send messages on the communication channel (RTS NS0, RTS NS1), each of said messages being sent on a sub-band of the communication channel.

Abstract: A RFID VHBR receiver including a quadrature digital demodulator, a symbol synchronization module at the baud rate and a PSK demodulator. The symbol synchronization module receives the in-phase and quadrature samples from the demodulator and extracts the components of the PSK symbols at the baud rate by selecting a decimation point in time. This synchronization is made by taking advantage of the particular structure of the preamble of the transmission frame in a RFID VHBR receiver.

Abstract: A filter bank multi-carrier (FBMC) receiver implementing a synchronization in the frequency domain. The receiver includes a synchronization module including an error estimator on the sampling instants and, for each subcarrier, an interpolating filter for reconstructing the samples at the accurate sampling instants. A phase-shifter is provided, for each subcarrier, at the output of the interpolating filter, to make a phase compensation. The phase-shifter can be followed by an equalizer in the frequency domain.

Abstract: A method for multiple access to a frequency band of a communication channel of a communication network with carrier sensing and collision avoidance, including a division of the frequency band into a set of request-to-send sub-bands dedicated to the transmission, by source nodes to a destination node, of request-to-send messages for communicating data on the frequency band is provided. The method includes an evaluation of a communication channel load, and, as a function of the result of the evaluation, a re-division of the frequency band to modify the number of sub-bands of the set of request-to-send sub-bands.

Abstract: The invention relates to a RFID VHBR receiver comprising a quadrature digital demodulator, a symbol synchronization module at the baud rate and a PSK demodulator. The symbol synchronization module (200) receives the in-phase and quadrature samples from the demodulator and extracts the components of the PSK symbols at the baud rate by selecting a decimation point in time. This synchronization is made by taking advantage of the particular structure of the preamble of the transmission frame in a RFID VHBR receiver.

Abstract: A quadrature demodulator not requiring analogue mixers. The demodulation is made using a first integrator and a second integrator which are controlled by square logic signals at twice the frequency of the carrier, the received signal being alternatively integrated by the first integrator and the second integrator over periods of time equal to a quarter period of time of the carrier frequency. The samples of the first and second integrators are sampled and subtracted from each other. The successive samples are combined in a first and a second combining module for providing in-phase and quadrature component samples. This demodulator can further be provided with a synchronization module IQ and a symbol synchronization module.