Enhanced Geometry-Based MIMO Propagation Channel Modeling for 4G Networks

ABSTRACT: Enhanced geometry-based Multiple-Input Multiple-Output (MIMO) channel models for wideband propagation channels of 4G networks are proposed. The contribution of the paper is three-fold. First, joint single- and double-bounce propagations are modeled by considering the scatterers located indoor on a hollow-disk around the user antennas. Second, the propagation channel model is derived when indoor scatterers are located on a hollow-disk around the user and a group of outdoor scatterers exist between the base station and the user. The outdoor scatterers cause double-bounce propagations and are located either as a compact form or distributed one. Third, the closed-form Cross-Correlation Functions (CCFs) are derived for the aforementioned scenarios. These functions depend on various parameters of interest including the distance between the base station and the user, the spacing among antennas elements, and the directions of the antennas elements. A numerical study is performed to calibrate/verify the CCFs. Finally, the capacity of the channel is derived. We compare the derived capacity with the one achieved by the Radiowave Propagation Simulator (RPS) package. The results show that considering the outdoor scatterers increases the accuracy of the capacity computation significantly.