Orange

B-com

Marc Lanoiselee

Pierre Siohan

Laurent Cariou

Bruno Jahan

Pierrick Louin

A method for generating a multicarrier signal formed by multicarrier symbols. the method includes: obtaining N first modulating symbols and N second modulating symbols from a sequence of source symbols, the obtaining including, for at least one of the source symbols indexed k, a sub-step of: linearly combining a real part and an imaginary part respectively, of the symbol indexed k with a real part and an imaginary part respectively, of one of the source symbols indexed k+/&#x2212;R, with R being a non-zero integer, delivering at least one first and one second combined symbol respectively; performing a frequency-time transformation of the N first and N second modulating symbols respectively, delivering a first block and a second block of N carriers respectively; and generating the multicarrier symbol from the first and second blocks of N carriers.

Method for generating a multicarrier signal, demodulation method, computer program product and corresponding devices

A method is proposed for generating an OFDM type multicarrier signal including OFDM blocks constituted by M carriers modulated by source symbols. The method includes the following steps: interleaving the M symbols of a block of source symbols into R sub-blocks of N interleaved symbols; obtaining a block of M time domain samples corresponding to the block of M source symbols; forming a peak vector containing N maximum amplitudes determined from among the M samples; attenuating the extrema of each sub-block of N time domain samples corresponding to the R sub-blocks of N interleaved symbols by a correction of symbols taking account of the peak vector and delivering R sub-blocks of N corrected interleaved symbols; de-interleaving the R sub-blocks of N corrected interleaved symbols delivering a block of M corrected source symbols; generating an OFDM block of the signals corresponding to the block of M corrected source symbols.

Method and device for generating a multicarrier OFDM signal, method and device for attenuating extrema of such a signal, corresponding computer program products

A method for multi-carrier transmission of a signal including OFDM blocks formed from N carriers modulated by a constellation symbol. The method includes, for at least one OFDM block: a phase of prebuilding M prebuilt complex time samples representative of the N carriers of the OFDM block, and a phase of correcting the constellation symbols modulating the N carriers, including the following acts, repeated for each carrier: detection of P samples having a power higher than a predefined threshold, delivering the P samples and M&#x2212;P zero samples, forming M complex time samples to be corrected, correcting the constellation symbol on the basis of the M complex time samples to be corrected, delivering an item of complex correction data, building M complex time samples associated with the item of complex correction data, and updating the M prebuilt complex time samples.

Method for reducing PAPR in a transmission of a multi-carrier signal, and corresponding transmission device and computer program

A method is provided for transmission of an OFDM signal, wherein pre-transmission processing includes: mapping data representative of a source signal to complex symbols Xn, 0&#x3c;=n&#x3c;M, belonging to a constellation; transforming M symbols Xn into M corrected symbols X'n, such that X&#x2032;n=Xn+dn, wherein dn is a complex correction; and mapping M corrected symbols X&#x2032;n to M from N carriers of an OFDM modulator to generate an OFDM signal, M&#x3c;=N. The transformation includes initializing an accumulator, and, for each carrier of order n: accumulating at J samples of the n-order carrier mapped by X&#x2032;n; detecting a peak on the J samples accumulated at order n&#x2212;1 and comparing the peak with the corresponding time sample of the n-order carrier delivering complex correction control information; and determining the correction value dn to obtain the corrected symbol X&#x2032;n according to the correction control information.

Method for the transmission of a multi-carrier signal, and corresponding transmission device and computer program

A weighting filter is provided for use in a device for transmitting and/or receiving an analog signal. The device is capable of transmitting and/or receiving the analog signal in a predetermined frequency band consisting of two adjacent sub-bands, referred to as first and second sub-bands. The weighting filter includes: a first branch, which attenuates the analog signal; a second branch that filters the analog signal and has a bandwidth corresponding to the first sub-band or to the second sub-band; and a module that combines signals from the first and second branches.

Weighting filter, and corresponding methods and devices for transmitting and receiving an analog signal and computer program

A method is provided for receiving a multicarrier signal including a time-based succession of symbols, each including a plurality of multicarriers bearing data, at least one of said symbols including at least one reference pilot. The method includes the following steps: a first estimation of a propagation channel, in accordance with a first estimating technique taking into account the or said reference pilots; at least one second estimation of said propagation channel, in accordance with a second estimating technique different from said first technique; comparing said first and second estimations, delivering an error signal; detecting at least one interfering signal in said propagation channel, by analyzing said error signal.

Method for receiving a multicarrier signal using at least two estimates of a propagation channel and corresponding reception device

The disclosure relates to a radio broadcasting method for a first multicarrier digital signal occupying a first frequency band adjacent to at least one second frequency band, each assigned to a second signal. Pre-filtering is applied to the said first signal before its emission so as to attenuate the power of the said first signal in at least a first portion of the said first frequency band, adjacent to the said second frequency band(s).

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La Chapelle des Fougeretz, France

Marc Lanoiselee