Interference mitigation utilizing antenna mutual coupling

In this paper, we show interference can be removed almost perfectly under some conditions in multi-user MIMO if antenna mutual coupling is properly utilized. We analyze the capacity region of a Gaussian multiple access channel (MAC), where each transmitter has a single antenna and the receiver can measure the electric field in a given spherical volume with additive noise. The additive noise in the sphere is assumed to be spatially correlated based on the fluctuation-dissipation theorem in thermodynamics. As a result, the interference can be almost perfectly removed under some conditions.