The classical detection techniques for multiple-input multiple-output (MIMO) systems are usually designed with the assumption\nthat the additive complex Gaussian noise is uncorrelated. However, for closely spaced antennas, the additive noise is correlated\ndue to the mutual antenna coupling. This letter analyzes an improved zero-forcing (ZF) technique for MIMO channels in colored\nenvironments. The additive noise is assumed to be correlated and the Rayleigh MIMO channel is considered doubly correlated. The\nimproved ZF detector, based on the generalized least squares estimator (GLS), takes into account the noise covariance matrix and\nprovides an unbiased estimator of the transmitted symbol vectors. We introduce some novel bounds on the achievable sum rate,\non the normalized mean square error at the receiver output, and on the outage probability.The derived expressions are compared\nto Monte Carlo simulations.
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