Multiband digital predistortion for broadband communications

A method comprising:

• receiving a wide-band (WB) input signal;
• segmenting the WB input signal into N sub-band (SB) input signals, wherein N is an integer greater than 1;
• determining a subset of a plurality of sub-band combinations as having significant contributions to non-linear distortion of the WB input signal, wherein a multi-band digital pre-distortion (mDPD) processor has a modular structure including modules, each module corresponding to a respective one of the plurality of sub-band combinations, such that the subset of the plurality of sub-band combinations corresponds to a subset of the modules;
• generating N pre-distorted SB signals from the N SB input signals by pre-compensating, in each module of only the subset of the modules, a respective SB input signal of the N SB input signals both for a respective estimated in-band distortion and for a respective estimated cross-band distortion corresponding to the sub-band combination associated with the module, wherein each respective estimated in-band distortion and each respective estimated cross-band distortion is derived from a model of non-linear characteristics of a high-power amplifier (HPA);
• and
• combining the N pre-distorted SB signals to generate a pre-distorted output signal.