Multi-cell processing architectures for modeling and impairment compensation in multi-input multi-output systems

A method for predistortion, the method comprising:

• receiving a plurality of input signals forming a multiple-input signal in a multiple-input multiple-output system;
• generating a pre-distorted multiple-input signal from the received multiple-input signal;
• generating a multiple-output signal by feeding the pre-distorted multiple-input signal into a multiple-input and multiple-output transmitter;
• estimating impairments generated by the multiple-input and multiple-output transmitter, the impairments comprising nonlinear crosstalk between distinct ones of the plurality of input signals;
• and
• adjusting the pre-distorted multiple-input signal to compensate for the estimated impairments, wherein generating the pre-distorted multiple-input signal comprises feeding the received multiple-input signal to a matrix of pre-processing cells, comprising, in each of the pre-processing cells of the matrix:
• nonlinear processing blocks compensating for multiple-input multiple-output nonlinear distortions and an effect of interferences between signal paths of the multiple input signal and signal paths of the multiple-output signal;
• and
• linear processing blocks compensating for the multiple-input multiple-output linear distortions and the effect of interferences between the signal paths of the multiple-input signal and the signal paths of the multiple-output signal.