Alcatel

Evolium S.a.s.

Alcatel Radiotelephone

Thomson-csf

Alcatel N.v.

Nokia Technologies Oy

Alcatel Lucent

Luc Dartois

Emmanuel Rousseau

Peter P Reusens

Jakob Hoydis

Faycal Ait Aoudia

Denis Rouffet

Peter Jaenecke

Vijay Venkateswaran

Lydie Desperben

Andre Roullet

Jens Strauss

Jean-Pierre Guerlin

Samuel Betrencourt

Raymond Riboni

Francedillaois Robbe

Jacques Dulongpont

Paul Tourniaire

Etienne Vanzieleghen

Eric Lenormand

Andre Rouillet

Eric Wantiez

Friedrich Endress

Benoit Boyon

Philippe Benabes

A method, in abase station of a wireless telecommunications system comprising multiple radiating elements, the method comprising modifying a number of uplink or downlink information streams, each information stream corresponding to an element in a space sampling basis for the system, wherein, in the downlink, the space sampling basis is configured so that the number of information streams is the same as the number of radiating elements of the system, and in the uplink, the space sampling basis is configured using a composite antenna derived from multiple radiating elements of the system to form a synthesised beam.

Modifying a number of uplink or downlink information streams

According to an aspect, there is provided an apparatus comprising a combiner for combining a received analog signal with an analog dithering signal to produce a combined analog signal, a one-bit analog-to-digital converter for converting the combined analog signal to a combined digital signal, means for performing joint downsampling and feature extraction for the combined digital signal, means for implementing a trained machine-learning algorithm for calculating one or more input parameters for waveform generation at least based on one or more features extracted from the combined digital signal and a parametric waveform generator for generating the analog dithering signal based on the one or more input parameters.

Machine-learning-based detection and reconstruction from low-resolution samples

A signal modulation device comprising: an input for receiving a complex input signal () comprising an in-phase component signal and a quadrature-phase component signal, a sigma-delta modulator () for modulating the complex input signal at an oversampling clock rate (F1) into an intermediary signal (), a numerical oscillator () for generating a phase signal () oscillating at a selected carrier frequency (FC), wherein the phase signal takes a finite number of quantized states, and a symbol mapping table () comprising a predefined quantized symbol for each quantized complex state of the intermediary signal and each quantized state of the phase signal, and operates at each oversampling clock period (F1) to select a quantized symbol () as a function of a current quantized complex state of the intermediary signal () and a current quantized state of the phase signal ().

Signal modulation for radiofrequency communications

The invention relates to a base transceiver station (BTS) for communicating with a plurality of user equipments (UE, UE, UE, UE, UE) divided in at least two groups, said base station comprises: an antenna element arrangement generating at least two shifted static beams (Bi, Bo) with respective down tilts for reaching the user equipments (UE, UE, UE, UE, UE) a processing unit () connected to said transceiver chains () and having means for performing at least two linear complex combinations of up-link digital signals&#x2014;means for receiving said up-link signals and for selecting per user equipment the appropriate beam based on the quality of said up-link signals in the beam flows (Fi,FO).

Base transceiver station and associated method for communication between base transceiver station and user equipments

A method for clipping a wideband signal in order to eliminate signal overshots having an amplitude above a predefined threshold before submitting the wideband signal to a power amplifier. The method subtracts, from the wideband signal, filtered pulses in phase with the wideband signal, each filtered pulse corresponding to an overshot, and the amplitude of each filtered pulse being dependant on the amplitude of the corresponding overshot and on the predefined threshold. The subtraction step is repeated at least twice on the wideband signal.

Method for clipping a wideband radio signal and corresponding transmitter

The invention relates notably to a method for scaling peak power amplitudes in a signal at a transmitter before submitting said signal to a power amplifier. According to the invention, the method consists in:

Method for scaling peak power amplitudes in a signal and corresponding transmitter

The invention relates to a direct conversion receiver for down-converting a received multi-carrier signal comprising at least a first and a second carrier signal at image carrier frequencies to a base band resulting in that the first carrier signal includes an image signal of said second carrier signal. Further, the known direct conversion receiver comprises at least a first and a second digital down-converter unit for separating the first and the second carrier signal from the down-converted multi-carrier signal after digitization. In order to make such receivers less complex and adjust them for fast time varying szenarios it is proposed to provide an error estimating unit to said receivers for calculating a compensating coefficient representing the quota and/or the phase position of the image signal of the second carrier signal being included in the first carrier signal and to remove the undesired image signal in response to said compensating coefficient.

Direct conversion receiver

The invention concerns a unit for sending from a base station to terminals in a telecommunications system, said unit comprising at least two sending channels or groups of sending channels adapted to send on a plurality of adjacent carrier frequencies, said channels being able to send in spatial diversity mode so that the same information may be sent by the channels or groups of channels on the same carrier frequency or frequencies. In this unit the channels or groups of channels use at least one common carrier frequency for sending in spatial diversity mode and at least one of the channels or groups of channels comprises at least one different frequency for sending without spatial diversity or with a lower degree of spatial diversity.

Base station for a telecommunication system

The invention relates to a method of transmitting calls in a cellular type telecommunications system using a plurality adjacent carrier frequency bands and in which a first cell or a first site uses only a fraction of said frequency bands, the transmitted signals being subjected to peak clipping prior to application to an amplifier of a transmitter system in order to optimize the efficiency of the amplifier. Prior to being applied to the input of the amplifier, the signals () to be transmitted for the first cell (or first site) are subjected to filtering () so that the power density of the peak-clipping noise is not eliminated in adjacent frequency bands (f, f) that are unused by said first cell.

Method of transmitting calls in a cellular type telecommunications system using adjacent carrier frequency bands

A method for the linearization of a wide frequency band power amplifier. The frequency band of operation of the amplifier is divided into at least two groups or subbands. The instantaneous frequency of each sampled input signal is measured in order to determine the group or subband to which it belongs, and predistortions are applied to the input signal, these predistortions depending on the frequency group. The method is particularly useful for the linearization of a power amplifier of a transmitter.

Method for linearising a power amplifier over a wide frequency band

The invention relates to a method of preparing signals (X and Y) to be compared to establish predistortion at the input of an amplifier ( ), the signals comprising a signal (X) before amplification and a signal (Y) after amplification by said amplifier. Preparation includes time aligning ( ) the signal before amplification (X) with the signal after amplification (Y) before using them to establish said predistortion. The invention preferably operates in two stages, namely a stage of coarse time alignment, in which the signal before amplification (X) is subjected to a time delay comprising an integer number of first time units, and a stage of fine time alignment, in which a delay or advance value of a fraction of the first time unit is determined.

Method and apparatus for preparing signals to be compared to establish predistortion at the input of an amplifier

The invention concerns a transmission equipment for a telecommunication system operating on a wide frequency band, which equipment contains: a signal branch ( ) including an analog chain ( &prime;), a power amplifier ( &prime;) associated to a feedforward linearization circuit including: a first subtractor ( &prime;) having a first input ( ) receiving a signal representing the input of the amplifier and a second input ( ) representing the output of this amplifier, residual error amplifier ( &prime;) which amplifies the output of the first subtractor, and a second subtractor ( &prime;) which subtracts the output of the residual error amplifier from the output of the power amplifier ( &prime;), the signal branch containing predistortion means ( ) which provide correction signals depending on the output signal of the power amplifier. The equipment contains a reference branch ( ) providing, to the first input ( ) of the first subtractor ( &prime;), a signal which is independent from the predistortion of the signal branch.

Method for linearizing, over a wide frequency band a transmission chain comprising a power amplifier

In a broadband multicarrier modulator, all processing within a modulator is replaced by a pre-computed table so that a modulated signal can be produced as a function of the modulating signal merely by reading the table. The carrier frequency of the modulator is even programmable. The size of the pre-computed table is reduced by using an automation. With this automation the address for reading the table at a given time depends on preceding values of the modulating signal. By reading the table on a time sharing basis it is even possible, with a single modulator, to perform the work of several modulators. A multicarrier modulator is then easily implemented.

Broadband multicarrier modulator and corresponding programming method

The invention concerns a method of transmitting a control signal by a base station of a digital cellular mobile radio system, said base station comprising at least one array of a plurality of antennas for dynamically creating a beam (,) transmitting said control signal, said transmit beam (,) being adapted to assume different angular positions (,) within a predetermined angular range (,). In accordance with the invention, said method includes a step of allocating to said control signal, in at least one of said transmit subsystems, a predetermined specific time shift so that said transmit beam (,), called a vibrating beam (,), assumes in succession at least some (,) of said different angular positions and enables isotropic broadcasting of said control signal in said angular range (,). The invention also concerns a corresponding base station.

Method of transmitting a control signal by a base station of a digital cellular mobile radio system and a corresponding base station

Fourier transform processing is applied to digital signals obtained by analog-to-digital conversion of signals supplied by two microphones spaced by a fixed distance to produce two series of discrete data each datum of which represents the energy and phase of a spectral frequency band of the received sound. A dominant angle of incidence representing the angle of incidence of a speech signal component of the received sound signal relative to the two microphones is determined from phase differences between the discrete data in the same frequency bands of the two series and is used to combined the two series of discrete data into a single instantaneous spectrum in which any speech signal component is amplified relative to the noise. A noise spectrum is updated by comparing for each frequency band of the instantaneous spectrum the absolute value of the difference between the dominant angle of incidence and the angle of incidence of the frequency band in question with a tolerance threshold, and setting the energy of the noise spectrum equal to that of the instantaneous spectrum if that difference is above the tolerance threshold. The updated noise spectrum is then subtracted from the instantaneous spectrum to obtain an output spectrum consisting of the speech spectrum.

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Carrieres sous Poissy, France

Luc Dartois