Alcatel

Angelo Leva

Arnaldo Spalvieri

Giovanni Paltenghi

Roberto Della Chiesa

Domenico Farnese

Gianluigi Redaelli

Sergio Gulino

A method for reducing the peak-to-average power ratio (PAR) of a multicarrier signal in transmitter/receiver systems. The method comprises the steps of: providing, in transmission, a digital signal to be transmitted; and subjecting such a signal to be transmitted to a Fourier transform in order to obtain a modulated signal. It is characterized by the steps of generating an anti-peak signal; summing said anti-peak signal with said modulated signal; and transmitting the sum signal. The invention provides a transmitter and a receiver for implementing the method. Through the use of the invention, the PAR is reduced as compared with the known techniques.

Method of reducing the peak-to-average power ratio of a fourier transform-generated multi-carrier signal in transmission systems

A method and/or system for stabilizing the operation of fractionally spaced equalizers has a number of taps (P), associated with which are respective equalization coefficients (c , . . . , c ), used in digital signal receivers, wherein the equalization coefficients (c , . . . , c ) are updatable to an algorithm (1) based on the minimization of a proper cost function (J) and stabilized for operation through a proper a modification (I) involving calculation of a plurality of values (I ) to be considered in updating the equalization coefficients (c , . . . , c ). According to the invention, these values (I ) are calculated in only one circuit (COMP) and serially transmitted to the fractionally spaced equalizer (FSE).

Stabilizing the operation of fractionally spaced equalizers in digital signal receivers

Adaptive digital pre-correction of nonlinearities introduced by power amplifiers

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Uboldo, Italy

Angelo Leva