Reducing distortions in amplified signals radiated by a multiple antenna system

A method of reducing distortions in a plurality of amplified signals to be radiated by a multiple antenna system comprising:

• selectively routing via switching logic a plurality of digital signals received at a plurality of inputs to pre-distortion logic for applying a pre-distortion function to said input digital signals prior to forwarding said signals towards a digital to radio frequency converter and subsequent amplifier, wherein said digital signals received at least one of said inputs are selectively routed to at least one of a plurality of pre-distortion logic units via said switching logic;
• selecting at least one input signal to be provided with feedback;
• receiving at least one feedback signal formed from a corresponding at least one of said amplified signals;
• routing said at least one feedback signal to processing logic;
• comparing at said processing logic, said at least one feedback signal with said at least one selected digital input signal from which said feedback signal stemmed;
• and
• determining a function to be applied by said pre-distortion logic to said at least one selected input signal.

A non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the following:

• selectively routing via switching logic a plurality of digital signals received at a plurality of inputs to pre-distortion logic for applying a pre-distortion function to said input digital signals prior to forwarding said signals towards a digital to radio frequency converter and subsequent amplifier, wherein said digital signals received at least one of said inputs are selectively routed to at least one of a plurality of pre-distortion logic units via said switching logic;
• selecting at least one input signal to be provided with feedback;
• receiving at least one feedback signal formed from a corresponding at least one of a plurality of amplified signals;
• routing said at least one feedback signal to processing logic;
• comparing at said processing logic, said at least one feedback signal with said at least one selected digital input signal from which said feedback signal stemmed;
• and
• determining a function to be applied by said pre-distortion logic to said at least one selected input signal.