The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 24, 2018
Filed:
Jul. 04, 2014
Ses S.a., Betzdorf, LU;
Roberto Piazza, Luxembourg, LU;
Bhavani Shankar Bysore Rama Rao, Luxembourg, LU;
Bjorn Ottersten, Luxembourg, LU;
SES S.A., Betzdorf, LU;
Abstract
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.