MIMO Channel Modeling and Capacity analysis using 3-D Spatial Statistical Channel Model for Millimeter Wave outdoor communication

We compute the Multiple Input Multiple Output (MIMO) channel capacity for 28 GHz and 73 GHz frequency bands using the 3-D Spatial Statistical Channel Impulse response model. Wideband capacity is evaluated using Rician distributed voltage amplitudes (varying K-factor for Line of Sight (LOS) and non-LOS (NLOS)) as well as spatial correlations of multi-path voltages present between transmitting and receiving antenna elements which is considered a significant factor when accounting for very small wavelength resulting in smaller spacing between antenna elements.Our simulation results show that due to fewer number of scatterers in Single Input Multiple Output (SIMO), the strong LOS component adds to the overall channel capacity, hence Rician distribution with a high K-factor (15 dB) outperforms Rayleigh distribution (K = 0 dB). On the other hand, due to a large number scatterers contributing in overall channel capacity in NLOS conditions for MIMO (low value of K-factor), it is concluded that using MIMO with millimeter wave frequencies is expected to provide overall higher capacity results due to scattering gain regardless of heavy propagation and blocking losses, later of which is dominant in NLOS conditions.