MULTIBAND DIGITAL PRE-DISTORTER WITH REDUCED DIMENSION REQUIREMENTS

There is provided mechanisms for operating a DPD for an access node. A method comprises receiving a plurality of input signals, each from a respective frequency band, wherein each signal is of memory order A. The method comprises, for each frequency band l=1, . . . , B of the frequency bands, generating a plurality of pre-distorted signals for the frequency band/based on the plurality of input signals coming from all the B frequency bands and using LUTs, according to which there is one LUT structure with LUT-based transforms per each combination of frequency band l=1, . . . , B and memory order m=0, . . . , 1, wherein each of the LUT structures comprises combinations of LUTs of at most dimension B−q, where 1≤q≤B. The method comprises, for each frequency band l=1, . . . , B of the frequency bands, combining the plurality of pre-distorted signals for the frequency band to provide a combined pre-distorted signal for the frequency band.