Transmitting method in multiple input and multiple output antenna system

An apparatus, comprising:

• at least one processor, and
• at least one memory comprising a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to:
• obtain, by a network node, a plurality of time domain symbols to be transmitted, the plurality of time domain symbols comprising time domain symbols to be broadcasted via a multiple input multiple output antenna system;
• determine, by the network node, a mapping between the plurality of time domain symbols and parameters of control units associated with respective antenna elements of the multiple input multiple output antenna system, each control unit comprising a phase shifter, wherein the parameters of the control units control values of corresponding ones of the phase shifters to create a signal constellation to be transmitted, and wherein the mapping is performed based on an algorithm for minimizing distortion or bit error rate or both distortion and bit error rate at receiving user equipment;
• cause by the network node the parameters to be applied at the control units;
• and
• cause by the network node transmission of the plurality of time domain symbols via the multiple input multiple output antenna system.

A computer program product comprising a non-transitory computer readable medium comprising program instructions stored thereon for causing network node to perform operations comprising:

• obtaining, by a network node, a plurality of time domain symbols to be transmitted, the plurality of time domain symbols comprising time domain symbols to be broadcasted via a multiple input multiple output antenna system;
• determining, by the network node, a mapping between the plurality of time domain symbols and parameters of control units associated with respective antenna elements of the multiple input multiple output antenna system, each control unit comprising a phase shifter, wherein the parameters of the control units control values of corresponding ones of the phase shifters to create a signal constellation to be transmitted, and wherein the mapping is performed based on an algorithm for minimizing distortion or bit error rate or both distortion and bit error rate at receiving user equipment;
• causing by the network node the parameters to be applied at the control units;
• and
• causing by the network node transmission of the plurality of time domain symbols via the multiple input multiple output antenna system.