Network Model of a 5G MIMO Base Station Antenna in a Downlink Multi-User Scenario

A system level network model of a 5G base station\ua0antenna (BSA) with massive multiple-input multiple-output\ua0(MIMO) capabilities is presented that incorporates antenna\ua0mutual interaction and signal processing aspects. The combined\ua0transmitter-channel-receiver in such a system is modeled by\ua0cascading Z-matrices to interrelate the transmitter and receiver\ua0port voltages/ currents to one another. The developed model is\ua0then subjected to the zero-forcing (ZF) beamforming algorithm to\ua0compute the per-antenna transmit power for a specific minimum\ua0signal level at the receiver as well as the required BSA effective\ua0isotropic radiated power (EIRP). The presented initial results\ua0show that in a line-of-sight (LOS) environment the required EIRP\ua0to achieve a 1 Gbps bitrate user link in a 15–200 m coverage\ua0ranges from 25–48 dBm, which increases to 31–54 dBm after\ua0incorporating first-order mutual coupling effects among the BSA\ua0elements