Abstract: A PLL comprises a PFD, a loop filter and a VCO, as well as a voltage shift capacitor coupling the PFD and the VCO. A voltage shift control circuit is placed in parallel with the voltage shift capacitor. This circuit comprises controlled charging means, which are designed to charge the voltage shift capacitor according to a channel control signal. It also comprises controlled pre-charging means which are designed to accelerate the charging of the voltage shift capacitor by the controlled charging means. It further comprises controlled biasing means, designed to ensure the bias of the input during the pre-charging of the voltage shift capacitor.

Abstract: a method whereby a linearization training sequence is designed to be transmitted by means of a radiofrequency transmitter incorporated in a mobile terminal or a base station of a radiocommunication system comprising a fixed network. The sequence is adapted for transmitting bursts in accordance with a specific frame structure. Besides, the sequence is included in a sequence of symbols further designed to enable the transmission chain parameters to be adjusted.

Abstract: To allow the synchronization at multiframe level of a mobile terminal on a traffic down path which exhibits a multiframe structure with a determined number L of useful data frames, the base stations send signalling frames respectively associated with each useful data frame of the traffic down path and each containing a signalling code. The number N of distinct values of the signalling codes which are usable by the mobile terminal to recover the synchronization at multiframe level is less than L. These values are apportioned to the associated signalling frames in such a way that there exist two integers P and Q, not both equal to unity, such that P×Q of these values, respectively contained in P sequences of associated signalling frames each comprising Q signalling frames respectively associated with any Q consecutive useful data frames of a multiframe, form a unique word.

Abstract: The invention provides a multicarrier system constructed on a time-frequency lattice defined comprising frames having MxN symbols distributed over M subcarriers each of which is divided into N specific symbol times. Each frame comprises P pilot symbols distributed time-wise and frequency-wise so as to cover the frame in a meshed structure, so that, in particular, some at least of the M subcarriers contain no pilot symbol and/or that no pilot symbol should be transmitted to some at least of the N symbol times. The invention also relates to a method for tracking a transmission channel using such a signal, and a device for implementing the method.

Abstract: The invention relates to a method for the automatic configuration of an IP telephony device and/or data from a data transmission network with packet switching, which enables the device to obtain a lease on a virtual sub-network while it is physically connected to another virtual sub-network. In this way, for example, another device can share the same physical access port to the networks via a switch, without the two devices necessarily receiving a lease on the same sub-network.

Abstract: The invention concerns a method and a device for converting an input digital value quantized in accordance with a first quantization factor and encoded on at most n1 bits, into an output digital value quantized in accordance with a second quantization factor and encoded on at most n2 bits. The method comprises the steps of: multiplying the input digital value by an integer B, encoded on at most ? bits, so as to generate an intermediate digital value; and dividing, in fixed point, the first intermediate digital value by the number 2?, where ? is an integer not greater than n1+?, generating the output digital value. The number B/2? is substantially equal to the ratio of the second quantization factor over the first quantization factor. Additionally, the divider means comprise a Sigma-Delta modulator.

Abstract: An amplitude- and frequency- or phase-modulated radio frequency signal generator that is used for radio emission, generates a phase or frequency control signal and an amplitude control signal from a phase or frequency modulation signal and from an amplitude modulation signal respectively. The generator comprises a phase or frequency modulator and a variable-gain radio frequency power amplifier. The amplitude of the output signal is automatically controlled. In addition, adaptive pre-distortion is carried out in order to pre-distort the phase or frequency control signal in accordance with the amplitude modulation signal during a permanent operating phase. During a learning phase, a pre-distortion module is adapted from the amplitude modulation signal and from the amplitude control signal.

Abstract: The invention concerns a passband Sigma-Delta analog-to-digital converter comprising a first resonator and a second order second resonator, preferably of second order, whereof the respective central frequencies enable a high SNR in a relatively wide frequency band, and a MASH Sigma-Delta analog-to-digital converter incorporating at least two such cascaded converters.