as The TXU transmitter converts baseband signals from the Common Public Radio Interface (CPRI) into radio frequency signals. Each baseband signal can be assigned to one or more TXU transmitters. The radio frequency outputs are distributed to the array of antennas via the radio distribution network. The TRU receiver converts RF signal to baseband. In order to provide an elevation of zenith angle Oetilt , each radio frequency signal supplied by the TXU unit is weighted by a complex coefficient and distributed to different radiated elements by the RDN. 5G-NR Radio Interface - MIMO and Beamforming The same operation is performed for the signal received from the antenna network. The configuration of the antenna array is given by the parameters (M, N and P), where M is the number of antenna elements having the same polarization in each column (M = {1, 2, 4, 8 }), N is the number of columns (N = {1, 2, 4, 8, 16}) and P is the number of polarizations (normally equal to 2). MTXRU is the number of TXU transmitters and TRU receivers per column and per polarization and NTXRU is the number of TXU/TRUs per row and per polarization. Two generic mapping models between, on the one hand, antenna elements {M, N, P} and, on the other hand, TXU transmitters and TRU receivers {MTXRU, NTXRU} have been defined; the antenna partitioning model and the full connection model. For the antenna partitioning model (Figure 6.6), the antenna elements are distributed among different groups, and each TXU/TRU is connected to a group. The value of the weighting Wk of the radio signal is given by the following formula: where: A is the wavelength; d, is the distance between two vertical antenna elements; etilt is the zenith angle. For the full connection model (Figure 6.6), each TXU/TRU is connected to all antenna elements. A combiner is used to connect the different TXU/TRU units to each antenna element. The value of the weighting Wm,m' of the radio signal is given by the following formula: for m=1, 2, M and m '=1, 2, MTXRU NG-RAN and 5G-NR Antenna pa