Active antenna array having analogue transmitter linearisation and a method for predistortion of radio signals

A method for predistortion of radio signals comprising:

• predistorting two or more of a plurality of analogue payload signals, thereby obtaining at least two predistorted payload signals,
• amplifying the at least two predistorted payload signals,
• extracting a portion of one or more of the at least two predistorted payload signals as a single feedback signal, and
• adapting the predistorting of the two or more of the plurality of analogue payload signals by comparing the single feedback signal with at least one of the two or more of the plurality of analogue payload signals.

A computer program product comprising a non-transitory computer-usable medium having control logic stored therein for causing a computer to manufacture an active antenna array for a mobile communications network, the active antenna array comprising:

• a digital signal processor connected to a plurality of digital-to-analogue conversion blocks;
• a plurality of antenna elements;
• a plurality of transmission paths, whereby an individual one of the plurality of transmission paths is connected between an individual one of the digital-to-analogue conversion block and an individual one of the plurality of antenna elements, whereby an individual one of the plurality of transmission paths comprises a predistorter and a coupler;
• a plurality of paths connected between an individual one of the couplers and a single combiner
• a single feedback path connected between the single combiner and a predistorter coefficient calculation unit;
• and
• a coefficient update path connected between the predistorter coefficient calculation unit and at least an individual one of the predistorters.

A computer program product comprising a non-transitory computer-usable medium having control logic stored therein for causing an active antenna to execute a method for receiving a plurality of individual radio signals comprising:

• first computer readable code means for predistorting two or more of a plurality of analogue payload signals, thereby obtaining at least two predistorted payload signal;
• second computer readable code means for amplifying the at least two predistorted payload signal
• third computer readable code means for extracting a portion of one or more of the at least two predistorted payload signal as a single feedback signal
• fourth computer readable control means for adapting the predistorting of the two or more of the plurality of analogue payload signals by comparing the single feedback signal with at least one of the two or more of the plurality of analogue payload signals.