1. A communication node comprising: a multiple input multiple output (MIMO) antenna array; a precoder configured to precode a set of Grassmannian-structured symbols according to a transmit covariance matrix associated with the MIMO antenna array to produce a set of Grassmannian-structured precoded symbols; and a transmitter coupled in-between the MIMO antenna array and the precoder, the transmitter configured to transmit the set of Grassmannian-structured precoded symbols over a spatially correlated non-coherent channel between the MIMO antenna array and a receiver.