DETERMINATION OF DIGITAL PRE-DISTORTER SIZE OF AN ACCESS NODE

There are provided mechanisms for DPD size determination of an access node. The access node is configured for operation in a digital massive MIMO system. The access node includes a plurality of antennas, one radio chain per antenna, and one DPD per radio chain. A method is performed by the access node. The method includes obtaining channel gain estimates per each of the plurality of antennas. The method includes determining the size, in terms of number of coefficients, of each DPD according to a utility function that depends on the channel gain estimates per antenna. The method includes allocating the determined number of coefficients to each DPD.