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We propose a unitary precoding scheme, namely polar-precoding, to improve theperformance of polar-coded MIMO systems. In contrast to the traditional designof MIMO precoding criteria, the proposed polar-precoding scheme relies on the\emph{polarization criterion}. In particular, the precoding matrix designcomprises two steps. After selecting a basic matrix for maximizing the capacityin the first step, we design a unitary matrix for maximizing the polarizationeffect among the data streams without degrading the capacity. Our simulationresults show that the proposed polar-precoding scheme outperforms thestate-of-the-art DFT precoding scheme.

Polar-Precoding: A Unitary Finite-Feedback Transmit Precoder for Polar-Coded MIMO Systems