Low complexity precoder

An apparatus, comprising:

• at least one processor;
• and
• at least one non-transitory memory storing instructions that, when executed with the at least one processor, cause the apparatus to perform at least:
• receiving downlink channel estimates between a plurality of access point, antennas of one or more access points and a plurality of user equipment, antennas of one or more user equipments of a communication system;
• iteratively updating a set of power allocation weights for the access point antennas using an estimated power allocation associated with the access point antennas extracted from a precoder, the precoder computed based on the received channel estimates and a previous set of power allocation weights, until a stopping criterion is reached, wherein the iteratively updating further comprises:
• for the one or more iterations,
• computing a precoder matrix of the precoder based on the set of power allocation weights and the received channel estimates;
• extracting an estimated power allocation associated with the access point antenna from the computed precoder matrix of the precoder;
• and
• updating the set of power allocation weights for the access point antennas based on applying the estimated power allocation associated with the access point antenna to the corresponding power allocation weight for that access point antenna from the set of power allocation weights;
• and
• outputting data representative of a precoder computed from the received channel estimates and the updated set of power allocation weights.