3D Channel Modeling And Measurements For Massive MIMO System

Massive Multiple-Input Multiple-Output(MIMO)systems use a few hundred antennas to simultaneously serve a large number of data streams for one or a lot of wireless broadband terminals for the Fifth Generation(5G)mobile communication systems.Massive MIMO systems envision accurate beamforming and decoding with simpler and possibly linear algorithms.There are few fundamental issues about massive MIMO networks that need to be better understood before their successful deployment.For an appreciate design and evaluation of future massive MIMO wireless communication systems,we need accurate channel models that characterize wireless propagation channel.In this thesis,we present a detailed review of massive MIMO systems,highlighting key system components,and research directions.These include,the advantage of employing beam pattern in the antenna elements,precoding operations in Single-user(SU)-massive MIMO systems,where the effect of beam pattern on the transmit and receive antenna elements are considered.In addition,we propose a practical framework for deriving the statistical properties of Three-Dimensional(3-D)channel models,considering beam patterns in vertical spatial correlation for different antenna elements.The beam patterns using dipole antenna elements with different phase excitation toward the different Direction of Travels(Do Ts),contributes various correlation weights for rays related towards/from the cluster.Thus,providing different Elevation Angle of Arrivals(EAo As)and Elevation Angle of Departures(EAo Ds)for each antenna element.Furthermore,SU-massive MIMO channel models are extended to3-D Multi-user(MU)-massive MIMO,where geographical correlation between different users have been considered.Furthermore,we also propose a novel 3-D stationary MU-massive MIMO channels for outdoor-to-indoor channel.The models are defined by two effective physical objectives,one around the Transmitter(TX),and other one is in the cube at the office/shopping mall around the Receiver(RX).Prior to this,we assumed that the clusters reflect from different sides of the cube which are divided into several Ray paths that contributes different elevation/azimuth angles.Overall,their impact on 3-D SU/MU-massive MIMO channels are investigated via statistical properties including received spatial correlation and channel properties.Then,experimental validation of the proposed 3-D channel models on azimuth and elevation angles of polarized antenna specifically evaluated and compared through simulations.Finally,the proposed practical and simulation models are indispensable for the design,testing,and performance evaluation of 5G wireless communication systems in general and field experiment channel models at Shanghai Jiao Tong University(SJTU)ones in specific.