Method for predistortion of a signal transmitted between two units of a telecommunications network and a unit for carrying out the method

A method for predistorting a signal sent from a first unit to a second unit, said first unit sending data to said second unit through a first channel and said second unit sending data to said first unit through a second channel, said method comprising the step of, in the first unit, computing representative coefficients of the second channel on the basis of a second predetermined sequence sent from the second unit to the first unit, characterized in that said method further comprises the following steps:

• sending by the first unit to the second unit a first sequence which results from the convolution of a predetermined sequence and of said representative coefficients of the second channel, said first sequence being sent back as received by second unit to the first unit, in the form of a return sequence;
• in said first unit, computing inverse coefficients of the first channel on the basis of said return sequence;
• and
• predistorting the signal sent by the first unit on the basis of said inverse coefficients of the first channel.

A unit of a telecommunications system that predistorts a signal to be sent to a remote unit, said unit comprising a predistorter which predistorts said signal to be sent, said unit characterized in that it comprises:

• a first coefficient computer which computes representative coefficients of the second channel on the basis of a second predetermined sequence sent from the remote unit to the unit;
• a first sequence transmitter which transmits a first predetermined sequence to the remote unit, which sends it back in the form received to the said unit, in the form of a return sequence;
• a second coefficient computer which computes representative coefficients of the first and second channels jointly, on the basis of the return sequence received;
• and
• wherein said predistorter predistorts the signal sent by means of the inverse coefficients of the first channel which are computed according to said representative coefficients of the second channel and said representative coefficients of the first and second channels jointly.

A unit of a telecommunications system that predistorts a signal to be sent to a second unit, said unit comprising a predistorter which predistorts said signal to be sent;

• characterized in that said unit further comprises
• a first inverse coefficient computer which computes inverse coefficients of the second channel on the basis of a second sequence sent from the second unit to the first unit;
• a first sequence transmitter which sends to the second unit a first sequence which results from the convolution of a predetermined sequence and of said inverse coefficients of the second channel, said first sequence being sent back as received by the second unit to the first unit, in the form of a return sequence;
• a second inverse coefficient computer which computes inverse coefficients of the first channel on the basis of said return sequence;
• and
• wherein said predistorter predistorts the signal to be sent according to said inverse coefficients of the first channel.