Commissariat a L'energie Atomique Et Aux Energies Alternatives

Commissariat a L'energie Atomique

Other

Xantima LLC

Marc Laugeois

Didier Lattard

Bernard Piaget

Didier Varreau

Nicolas Cassiau

Mathieu Bouvier Des Noes

Luc Maret

Jean-Remi Savel

Bouvier Des Noes Mathieu

Xavier Popon

Jene-Remi Savel

Jean-Remy Savel

A processing method in a wireless telecommunications receiver receiving a digitally modulated single-carrier signal includes, between a matched filter, in the time domain, operating at a frequency drx×B and a frequency equalizer, operating at the frequency B, a decimation step comprising: i/extracting, from a filtered signal frame, a first sequence of samples for aiding the decimation and having the same power; and a second sequence of payload samples intended to be equalized; ii/estimating the variance in the power of each of the drx decimation phases of the first sequence and identifying the ndecimation phase associated with the minimum variance; iii/decimating the second sequence by selecting the ndecimation phase of the second sequence and supplying the decimation phase at the input of the frequency equalizer.

Processing method in a wireless telecommunications receiver receiving a digitally modulated single-carrier signal, associated wireless telecommunications receiver and associated computer program

An OFDM modulator including a predistortion module configured to receive the Nconsecutive data carriers and configured to compensate for distortion subsequently introduced by a polyphase filter bank connectable to the output of the OFDM modulator, a transformation module configured to apply a discrete inverse Fourier transform of constant size Nindependently of the numbering and transmission band used by the OFDM transmitter including the OFDM modulator, a filling module, the input of which is connected to the output of the predistortion module, and the output of which is connected to the input of the transformation module, and configured to insert (N−N) null carriers in succession to the Nconsecutive data carriers independently of the parity of the index i associated with the OFDM modulator.

OFDM modulator for block-filtered OFDM transmitter, related block-filtered OFDM transmitter and transceiver system

A calibration method for calibrating a reception chain comprising an input amplifier of an analogue-to-digital converter, and including the following successive steps: determining a rest gain as a function of the average power of the noise present on a digital signal from said converter; and setting the gain of the input amplifier at said rest gain when the average power of said digital signal is lower than a first threshold.

Method for controlling a gain

A method of synchronising a communication signal entering into a receiver. Each frame of the signal includes a learning symbol formed of N repetitions of a learning sequence. The method includes the determination of a total correlation signal by correlating the input signal with a correlation symbol formed of N repetitions of a correlation sequence corresponding to all or part of the learning sequence and duration t, and the determination of a partial correlation signal by correlating the input signal with the correlation sequence. A peak of the total correlation signal is identified at an instant t. At least one threshold is defined from the power of the peak of the total correlation signal, and the power of the partial correlation signal is compared here to the instants t&#x2212;k*t, with k a whole number between 0 and N&#x2212;1.

Time synchronisation method, insensitive to power variations, associated receiver and computer program

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.

Emitter with M-PAM modulation for wireless optical communication system

The invention relates to a receiver of a signal built as successive frames, comprising a plurality of antennas, a signal receiving chain associated with each antenna, and a power amplifier on each receiving chain to which is applied a gain set point provided by a gain control unit characterized in that it comprises an antenna selecting unit configured to select one antenna from the plurality of antennas, and a time synchronizing unit configured to determine the frame start and end times in the signal received by the selected antenna. The antenna selecting unit is further configured to assess the gain set point of each receiving chain and to eliminate from the selection each antenna associated to a receiving chain which gain set point in not in a steady state.

Multi-antenna receiver with a time synchronization common to the different receiver chains

A data transmission process with auto-synchronised correcting code, auto-synchronised coder and decoder, corresponding transmitter and receiver. According to the invention, synchronisation management signals (HS, SS, ID) are formed and, under the control of these signals, a header is inserted before a data group and after it a correcting code. At receive end, these synchronisation management signals are reconstituted, the presence of a header is detected and any erroneous symbols are corrected. The invention also provides for an auto-synchronised coder and a decoder and for a transmitter and a receiver using them.

Data transmission process with auto-synchronized correcting code, auto-synchronized coder and decoder, corresponding to transmitter and receiver

Data transmission process with auto-synchronized correcting code, auto-synchronized coder and decoder, corresponding transmitter and receiver

The invention relates to a device for exchanging digital data between several sources and at least one hub in a CDMA system, characterised in that it comprises a number n of digital transmission/reception circuits () installed in parallel, each circuit () comprising a transmitter () comprising means of generating an integer number Nof codes that will be used for spectral spreading of data to be transmitted and a receiver () comprising means () of detecting the access of new sources to the CDMA system transmission channel and means () of generating synchronisation signals and power control signals corresponding to each detected new source.

Digital data exchange device in a CDMA system

The invention relates to a device for exchanging digital data between several sources and at least one hub in a CDMA system, characterized in that it comprises a number n of digital transmission/reception circuits () installed in parallel, each circuit () comprising a transmitter () comprising means of generating an integer number Nof codes that will be used for spectral spreading of data to be transmitted and a receiver () comprising means () of detecting the access of new sources to the CDMA system transmission channel and means () of generating synchronization signals and power control signals corresponding to each detected new source.

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Grenoble, France

Marc Laugeois