Nodes and methods therein for improving multi-user transmissions in a wireless communications network

A node in a wireless communications network for multi-user transmissions in the wireless communications network, the node configured comprising a processor and a memory, the memory containing instructions executable by the processor to configure the network node to:

• determine channel estimates based on one of demodulation reference signals and a data symbol in at least one Physical Resource Block, PRB, of the latest received subframe;
• determine a phase difference and an amplitude difference between Resource Elements, REs, in a first set of contiguous REs in the at least one PRB of the latest received subframe based on the obtained channel estimates;
• and
• pre-equalize at least one channel within at least one PRB of a transmission subframe by aligning the phase and amplitude of REs in a second set of contiguous REs therein based on the determined phase and amplitude differences.

A computer storage medium storing an executable computer program, comprising instructions which, when executed on at least one processor, causes the at least one processor to perform a method comprising:

• determining channel estimates based on one of demodulation reference signals and a data symbol in at least one Physical Resource Block, PRB, of the latest received subframe;
• and
• determining a phase difference and an amplitude difference between Resource Elements, REs, in a first set of contiguous REs in the at least one PRB of the latest received subframe based on the obtained channel estimates;
• and
• pre-equalizing at least one channel within at least one PRB of a transmission subframe by aligning the phase and amplitude of REs in a second set of contiguous REs therein based on the determined phase and amplitude differences.