Stmicroelectronics N.v.

Stmicroelectronics S.a.

Régis Cattenoz

Chiara Cattaneo

Miguel Kirsch

Stéphane Tanrikulu

Fritz Lebowsky

Thierry Arnaud

Didier Helal

Philippe Rouzet

Patrick Conti

Chiara Martinelli-Cattaneo

Fédérico Corsi

Nils Rinaldi

Matteo Frigerio

A transmission band of an analog signal including successive symbols to be transmitted is notched, where each symbol includes sub-carriers to be modulated. In particular, in each symbol the sub-carriers corresponding to a part of the transmission band to be notched are suppressed. In addition, in each symbol a chosen part of the remaining sub-carriers to be modulated is also suppressed.

Method and device for notching the transmission band of an analog signal, in particular for a detect and avoid (DAA) operation mode of an MB-OFDM system

A calibration is performed tone per tone during interframe spacing. A peak detection is used for measuring the level of the corresponding signal, and a gain correction coefficient is stored for correcting the digital complex modulation coefficients provided by the mapping.

Method of calibrating the transmission chain of a wireless transceiver and corresponding wireless transceiver

The transmission band of an analog signal to be transmitted is notched, including sub-carriers to be modulated from digital modulation coefficients respectively associated with the sub-carriers. The method includes providing an initial digital signal from successive frequency-domain groups each containing the digital modulation coefficients respectively associated to the sub-carriers. The initial signal is filtered with a frequency resolution greater than the frequency resolution of the frequency-domain groups to remove frequencies corresponding to the sub-carriers to be removed. The filtered signal is windowed using a windowing mask having a representation in the frequency-domain including a main lobe and secondary lobes. The power spectrum of the lobes decrease faster than the inverse of the frequency squared.

Method and device for notching the transmission band of an analog signal, in particular an MB-OFDM signal

An incident signal contains a preamble including a training sequence having a series of pulses whose polarity and time shifts are defined by respective polarity code and time-hopping code. A method includes a digital cross-correlation of the received signal with the training sequence. The cross-correlation algebraically sums in accordance with the polarity code windows of the received signal. The starting points of the windows are determined by the time-hopping code. The cross-correlation further includes detecting the end point of the preamble from the result of the digital cross-correlation. When the size of the receiving buffer, i.e., the size of the window is smaller than the number N of samples of each replica of the training sequence, it is particularly advantageous that the digital cross-correlation be performed iteratively in a block-by-block fashion. The computation of each block is split into M slices which are computed by algebraically summing windows N/M samples long.

Method of synchronizing an independent data device of a wireless data communications system on an incident pulsed signal of the ultra wide band type, and corresponding independent data device

An incident pulse signal of the ultra wideband type conveys digital information that is coded using pulses having a known theoretical shape. A decoding device includes an input for receiving the incident signal, and for delivering a base signal. A comparator receives the base signal and delivers an intermediate signal representative of the sign of the base signal with respect to a reference. A sampling circuit samples the intermediate signal for delivering a digital signal. A digital processing circuit correlates the digital signal with a reference correlation signal corresponding to a theoretical base signal arising from the reception of a theoretical pulse having the known theoretical shape.

Method and device for decoding an incident pulse signal of the ultra wideband type, in particular for a wireless communication system

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Régis Cattenoz