Measurement and modeling of interference for multiple antenna system

This paper provides a detailed signal model based on network theory to predict the multi-antenna capacity in the presence of co- and adjacent channel interference. This model expands on previous channel models by including the simultaneous effects of interference, antenna matching, efficiency, directivity and polarization. Single and multi-antenna interference are modeled using both a statistical channel model and a site-specific 3D ray tracer. The network theory based detailed signal model was obtained by adding antenna front end effects at both the transmitter and receiver to the channel models. This model was validated with measurements performed in two underground tunnels. The site-specific model predicted the capacity to within 1 bit/sec/Hz of the measurements while the statistical model was within 1-2 bits/sec/Hz except for a few locations. It was also observed that for small antenna spacing the conjugate match provides higher capacity than the self match.