Efficiency of Antenna Array Tapering in Real Propagation Environment of Millimeter Wave System

In real propagation conditions the angular spread of radio channel reshapes the effective antenna pattern and impacts the efficiency of tapering method in comparison to the nominal antenna pattern determined in anechoic chamber. This paper presents corresponding simulation results obtained for Urban Macro (UMa) and Urban Micro Street Canyon (UMi SC) channel models of 3^rd Generation Partnership Project (3GPP). Simulations indicate that for effective antenna pattern the first Sidelobe Suppression Level (SSL) can decrease to 16 dB, in Line of Sight (LOS) conditions, or even to 2 dB, in Non Line of Sight (NLOS) conditions, in comparison to SSL of 20 dB for the nominal antenna pattern.