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

TL;DR

This paper introduces polar-precoding, a novel unitary precoding scheme for polar-coded MIMO systems that enhances performance by leveraging polarization criteria, outperforming existing DFT precoding methods.

Contribution

The paper proposes a new polar-precoding scheme based on polarization criteria, combining capacity maximization with polarization enhancement without capacity loss.

Findings

Outperforms state-of-the-art DFT precoding scheme

Utilizes polarization criterion for improved MIMO performance

Design involves capacity-maximizing and polarization-maximizing steps

Abstract

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