10:00 - 11:00
Institute of Telecommunications
E389 Seminarraum 2 (CG0402)
Evaluating the Spatial Resolution of 2D Antenna Arrays for Massive MIMO Transmissions
Existing base stations (BSs) mostly feature linear horizontal antenna arrays, thus only exploiting the azimuth dimension. The additional control over the elevation dimension, as provided by 2D antenna arrays, enables a variety of new strategies such as full dimension (FD)-MIMO, 3-dimensional (3D) beamforming and vertical sectorization. Tailored vertical beams increase the signal power and reduce interference to User Equipments (UEs) in neighboring cells. A crucial component to enable the investigation of such techniques are channel models that incorporate the elevation dimension. A study on a 3D channel model is currently underway within the 3rd Generation Partnership Project (3GPP).
A particular challenge is the practical implementation of the model. Dealing with enormous computational complexity requires to design a highly efficient approach. We provide a guideline for the practical implementation of the 3GPP 3D model into existing link- and system-level simulation tools and show how the simulation run time evolves with respect to various network parameters.
Next we demonstrate the achievable spatial resolution of vertical beamforming with large antenna arrays. Existing work on directional beamforming strategies is commonly based on simplistic signal propagation assumptions under LOS conditions. By considering a realistic channel model that also accounts for multi-path propagation under NLOS conditions we observe that depending on whether the UE is located indoors or outdoors, the channel has an opposing impact on the achievable spatial separation.