Abstract: The invention relates to a space-time coding method for a MIMO-UWB system with P antennas using information symbols belonging to an M-PPM, where M is a multiple of P. The modulation alphabet is partitioned into P sub-alphabets corresponding to successive ranges of modulation positions. An extension of the initial alphabet is obtained by forcing the information symbols to belong to some sub-alphabets, thereby increasing the binary rate of said system.

Abstract: In a sphere decoding process, P PPM symbols emitted simultaneously are represented by a point of the modulation product constellation in a space of signals transmitted of dimension MP decomposed into P layers, each layer representing M modulation positions. The signal received is transformed into a representative point. The point of the product constellation closest to the received point within a sphere of given quadratic radius is determined. For each layer of rank p, ZF-DFE equalization is carried out; sorting in a list of the M PPM symbols as a function of the contributions that they would make to the quadratic distance to the received point is then carried out, followed by selection of the PPM symbol making the lowest contribution. The contribution is added to those from previous layers to obtain a sum of contributions. These steps are repeated until the lowest layer is attained.

Abstract: A method of space time coding for UWB transmission system including a plurality of radiative elements, the method coding a block of information symbols S=(?1, ?2, . . . , ?P) belonging to a M-PPM-M?-PAM modulation alphabet, as a sequence of vectors obtained from elements of the matrix: C = ( ? 1 ? 2 … ? P ?? P ? 1 ? ? ? ? ? ? 2 ?? 2 … ?? P ? 1 ) a row of the matrix corresponding to a use of the transmission channel and a column of the matrix corresponding to a radiative element, the matrix C being defined to within a permutation of its rows and/or its columns and ? being defined as the combination of a permutation (?) of the modulation positions of the M-PPM alphabet and a symmetry operation (?) of the M?-PAM modulation alphabet for one of the modulation positions (m±).

Abstract: The invention relates to a space-time coding method for a UWB transmission system comprising a plurality of radiative elements, said method coding a block of information symbols S=(?1, ?2, . . . , ?P) belonging to a PPM modulation alphabet, into a sequence of vectors, the components of a vector being intended to position-modulate a UWB pulse signal for a given radiative element of said system and a given transmission channel use, each component corresponding to a PPM modulation position, in which said vectors are obtained from the elements of the matrix: C = ( ? 1 ? 2 … ? P ? ? ? ? P ? 1 ? ? ? ? ? ? 2 ? ? ? ? 2 … ? ? ? ? P ? 1 ) a row of the matrix corresponding to a use of the transmission channel and a column of the matrix corresponding to a radiative element, the matrix C being defined to within a permutation of its rows and/or its columns and ? carrying out a permutation operation on the PPM modulation positions.

Abstract: The present invention relates to a differential space-time coding of blocks of 2, 4 or 8 information symbols belonging to a 2-PPM modulation alphabet, for a pulse UWB MIMO system with 2, 4 or 8 transmitter antennas. The proposed differential space-time code does not introduce an inversion of the polarity of the pulses, whilst offering maximum diversity and a unit rate. The invention also relates to a pulse UWB transmitter system with 2, 4, or 8 antennas which uses this differential space-time coding, as well as an associated receiver system which does not require channel estimation.

Abstract: The present invention relates to a space-time coding method for a UWB transmission system comprising at least two radiated elements. This method codes a block of information symbols S=(a1, a2 . . . , aP2)) belonging to a 2-PPM modulation or 2-PPM-M?-PAM composite modulation alphabet with M??2, into a sequence of vectors (sl,j,?si,j), the components of a vector being intended to modulate a UWB pulse signal for a radiative element of said system and for a given transmission interval (Tƒ).

Abstract: This invention relates to a space-time coding method for a UWB transmission system comprising two radiation elements. This method codes a block of information symbols (S=(a1,a2,a3,a4)) belonging to a PPM modulation constellation or a PPM-PAM composite modulation constellation with a number of time positions greater than or equal to 3, into a sequence of vectors (c10,c20,c11,c21), the components of a vector being intended to modulate a UWB pulse signal for a radiation element of said system and for a given transmission interval (Tf).

Abstract: A space-time coding method for a UWB transmission system comprising at least two radiated elements. The method codes a block of information symbols S=(a1, a2 . . . , ap,)) belonging to an M-PPM modulation or M-PPM-M?-PAM composite modulating alphabet with M being even, into a sequence of vectors (si,j, ?si,j), the components of a vector being intended to modulate a UWB pulse signal for a radiative element of said system and for a given transmission interval (Tƒ).

Abstract: This invention relates to a space-time coding method for a UWB transmission system comprising two radiation elements. This method codes a block of information symbols (S=(a1,a2,a3,a4)) belonging to a PPM modulation constellation or a PPM-PAM composite modulation constellation with a number of time positions greater than or equal to 3, into a sequence of vectors (c10,c20,c11,c21), the components of a vector being intended to modulate a UWB pulse signal for a radiation element of said system and for a given transmission interval (Tf).

Abstract: A method between terminals in a cooperative UWB pulse telecommunications system including a source terminal, a relay terminal, and a recipient terminal, the method including: transmitting, at the source terminal, a data symbol for the recipient terminal as a source signal constituted by a sequence of identical frames, the sequence corresponding to a symbol time, and each frame containing a pulse that is position-modulated by a PPM modulation alphabet; receiving, at the relay terminal, the source signal; detecting, at the relay terminal, a modulation position of a pulse in at least one frame of the source signal, referred to as the first position; transmitting, at the relay terminal, a relayed signal containing, in at least one predetermined subsequent frame of the symbol time, a pulse of which a position, referred to as a second position, is obtained from the first position by a permutation of the PPM modulation alphabet.

Abstract: This invention relates to a space-time coding process for a pulse type MIMO-UWB system using symbols belonging to a PPM modulation alphabet. Orthogonality of signals emitted by the different antennas is achieved by providing a mechanism for permutation of PPM symbol modulation positions and by imposing a constraint on the positions of said symbols. The space-time coding process according to the invention enables an incoherent type reception.

Abstract: A method of sending ultra-wide band signals via a plurality of sending antennas includes a phase for sending training sequences followed by a phase for sending data after which each antenna of the plurality of sending antennas sends a waveform using a Hermite pulse that is unique and orthogonal to the waveforms sent by the other antennas, and a device configured to perform the method.

Abstract: The present invention concerns a sphere decoder for maximum likelihood receiver intended to receive M-PPM-M?-PAM symbols at M modulation positions and at M? amplitude levels from a plurality P of sources. The sphere decoder uses a Schnorr-Euchner type enumeration adapted to classify the points of a multidimensional PPM-PAM modulation.

Abstract: A distributed space-time coding method for a UWB pulse telecommunication system, wherein a source terminal transmits a signal to a destination terminal during a transmission interval constituted by K frames, K?1, each frame being divided into a first and a second half-frame, the signal transmitted in each first half-frame being received, then retransmitted after amplification during the next second half-frame by a distinct relay terminal among K relay terminals of the system. The source terminal codes 4K data symbols belonging to a PPM modulation alphabet or a composite PPM-PAM modulation alphabet including a plurality of time positions, to provide a sequence of four transmission symbols per frame, the transmission symbols being obtained from 4K linear combinations of the data symbols using a plurality of coefficients belonging to a real algebraic extension of degree 2K of the field of rational numbers and, for one of the transmission symbols, a permutation of its PPM components.

Abstract: A method of space time coding for UWB transmission system including a plurality of radiative elements, the method coding a block of information symbols S=(?1, ?2, . . . , ?P) belonging to a M-PPM-M?-PAM modulation alphabet, as a sequence of vectors obtained from elements of the matrix: C = ( ? 1 ? 2 … ? P ?? P ? 1 ? ? ? ? ? ? 2 ?? 2 … ?? P ? 1 ) a row of the matrix corresponding to a use of the transmission channel and a column of the matrix corresponding to a radiative element, the matrix C being defined to within a permutation of its rows and/or its columns and ? being defined as the combination of a permutation (?) of the modulation positions of the M-PPM alphabet and a symmetry operation (?) of the M?-PAM modulation alphabet for one of the modulation positions (m±).

Abstract: This invention relates to a space-time coding method for a UWB transmission system including three or four radiative elements. It also relates to a method for transmitting a plurality of data symbols belonging to a PPM modulation constellation or a PPM-PAM composite modulation constellation using this space-time coding.

Abstract: The invention relates to a learning process for an ultra wideband communication system with M transmission antennas and N reception antennas and in which the information is modulated on L possible positions comprising the following steps: a) transmit a series of Nseq learning pulses from each emission antenna to all reception antennas. b) for each reception antenna j, estimate the M composite responses of series of emitted pulses that arrive at this reception antenna j, each composite response being estimated by eliminating the effects of other antennas. c) estimate correlations between the different channels.

Abstract: The invention relates to a space-time coding method for a UWB transmission system comprising a plurality of radiative elements, said method coding a block of information symbols S=(?1, ?2, . . . , ?P) belonging to a PPM modulation alphabet, into a sequence of vectors, the components of a vector being intended to position-modulate a UWB pulse signal for a given radiative element of said system and a given transmission channel use, each component corresponding to a PPM modulation position, in which said vectors are obtained from the elements of the matrix: C = ( ? 1 ? 2 … ? P ? ? ? ? P ? 1 ? ? ? ? ? ? 2 ? ? ? ? 2 … ? ? ? ? P ? 1 ) a row of the matrix corresponding to a use of the transmission channel and a column of the matrix corresponding to a radiative element, the matrix C being defined to within a permutation of its rows and/or its columns and ? carrying out a permutation operation on the PPM modulation positions.

Abstract: A space-time coding method for a UWB transmission system comprising at least two radiated elements. The method codes a block of information symbols S=(a1, a2 . . . , ap2)) belonging to an M-PPM modulation or M-PPM-M?-PAM composite modulating alphabet with M being even, into a sequence of vectors (si,j,?si,j), the components of a vector being intended to modulate a UWB pulse signal for a radiative element of said system and for a given transmission interval (Tƒ).

Abstract: The present invention relates to a space-time coding method for a UWB transmission system comprising at least two radiated elements. This method codes a block of information symbols S=(a1, a2 . . . , aP2)) belonging to a 2-PPM modulation or 2-PPM-M?-PAM composite modulation alphabet with M??2, into a sequence of vectors (sl, j, ?si,j), the components of a vector being intended to modulate a UWB pulse signal for a radiative element of said system and for a given transmission interval (Tf).