Ses S.a.

Roberto Piazza

Bjorn Ottersten

Bhavani Shankar Mysore Rama Rao

Bhavani Shankar Bysore Rama Rao

A method, carried out by a gateway transmitter (), aims at compensating the nonlinearities of a communication channel () comprising a repeater (). A plurality of digital signals is modulated (s) on a plurality of carriers, wherein symbols of the constellation diagram used for modulation of each carrier are distorted in accordance with a pre-distortion function. The modulated signals are then frequency division multiplexed (s), and sent (s) for transmission, through the communication channel (), to at least one receiver (). The pre-distortion function involves a plurality of polynomial functions, each of which taking as input the symbols from all the carriers. The polynomial functions' coefficients, called 'pre-distortion coefficients', are computed according to a direct learning approach, performed jointly for the plurality of carriers. The pre-distortion coefficients are iteratively updated based on received signals being fed back from a receiver (). The invention also relates to transmitters and computer programs.

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Luxembourg, Luxembourg

Roberto Piazza