Asymptotic spectral efficiency of spatially correlated MIMO multiple-access channels with arbitrary signaling inputs for joint and separate decoding

This paper derives a general explicit expression for the asymptotic (in the sense of large-system limit) spectral efficiency of a multiple-input multiple-output multiple-access channel (MIMO-MAC) where the transmitters and the receiver may have different spatial correlations, and the users´ inputs are not necessarily Gaussian. In addition to the spectral efficiency formula that assumes optimal joint-decoding at the base station, we also derive the asymptotic spectral efficiency of a more practical system which performs separate-decoding (multiuser detection followed by a bank of temporal error-correction decoders).