Capacity of MIMO-OFDM systems in spatially correlated indoor fading channels

Multiple-input multiple-output (MIMO) wireless systems provide significantly higher capacity compared to the conventional single antenna systems in rich scattering environments. However, the real capacity advantage in a specific channel environment strongly depends on its propagation characteristics. We analyse the capacity of orthogonal frequency division multiplexing-based spatial multiplexing system for indoor fading channels. We model the channel between the transmitter and receiver arrays by considering two indoor propagation models, the extended Saleh-Valenzuela (ESV) model and the geometrically based single bounce elliptical model (GBSBEM). Spatial correlation matrices for the realisations of the ESV and GBSBEM are obtained for the wideband MIMO fading channels, which are then used for the evaluation of mutual information and outage capacity using Monte-Carlo simulations. The behaviour of capacity against outage is investigated for different physical parameters and array geometries. Capacity results are discussed with similar power delay profiles, antenna spacing and angular spreads for uniform linear and circular arrays.