Frequency resource allocation in MU-MIMO systems

A method for frequency resource allocation in a MU-MIMO system comprising

• obtaining estimation of the Channel Estimation Error (CEE) and/or Speed Indication Information (SII) of User Equipment (UEs) by having the UEs send pilot or test signals to the base station (BS) and the BS estimates the CEE and/or SII of the UEs using the received signals from the UEs, or having the BS send a pilot or test signal to UEs and having the UEs feed back their CEE and/or SII to the BS;
• assigning UEs with CEE lower than a predefined value and/or SII lower than a predefined value to a first group and the rest UEs to a second group;
• allocating a first frequency resource to the first group and a second frequency resource to the second group;
• selecting and applying a first precoding algorithm for the downlink or a first decoding algorithm for the uplink that is more demanding on low CEE and/or low SII on transmissions in the first frequency resource;
• and
• selecting and applying a second precoding algorithm for the downlink or a second decoding algorithm for the uplink that is less demanding on low CEE and/or low SII on transmissions in the second frequency resource,
• wherein the first and second precoding algorithms and the first and second decoding algorithms are selected to produce greater sum-rate for each UE group, or smaller differences among the post Signal-to-Interference-plus-Noise-Ratios (SINRs) of the UEs in each group.