As we know, a user equipment (UE) can transmit its traffic with the power up to 23dbm. However, there is few materials mentions the maximum power a UE can apply if it has multiple antennas.
In this paper: https://www.researchgate.net/publication/344886461_Joint_Power_and_Resource_Block_Allocation_for_Mixed-Numerology-Based_5G_Downlink_Under_Imperfect_CSI It seems they assume different antennas have their own maximum power constraint; i.e., each antenna can transmit its data with the power up to the maximum value (e.g., 23dbm). Nevertheless, this indicates that if more antennas are used, more power will be required.
Is it the truth? Or in fact all the antennas share the maximum transmission power (the sum of the transmission power of all antenna should be less than the limit)?