MIMO Performance and Decoupling Network: Analysis of Uniform Rectangular array Using Correlated-Based Stochastic Models

We explore the dependency of MIMO performance on azimuthal spread (AS) and elevation spread (ES) using correlated-based stochastic models (CBSMs). We represent the transmitter as uniform rectangular array (URA), and derive an analytical function for spatial correlation, in terms of maximum power when phase gradient of the incident wave follows a Student’s t-distribution. We model the correlated-based stochastic MIMO system to investigate the usefulness of the analytical function, under the condition that the magnitude and phase of mutual coupling and consequently the coupling matrix of the coupled receiving monopole array differs much from that of the decoupled array. Verification is achieved with the help of simulation results, which support the existing fact that the azimuthal spread is the fundamental determinant of system capacity. However, we observed that lower values of AS and ES increase the rate of deterioration in the symbol error rate (SER) and not antenna spacing after decoupling process