MMSE Symbol Level Precoding Under a Per Antenna Power Constraint for Multiuser MIMO Systems With PSK Modulation

TL;DR

This paper introduces a symbol-level precoding algorithm for multiuser MIMO systems with PSK modulation, optimizing under per antenna power constraints to improve bit-error-rate performance at low and intermediate SNRs.

Contribution

It formulates a minimum mean squared error precoding method as a second-order cone program for optimal solutions under strict power constraints.

Findings

Outperforms existing methods in bit-error-rate at low/intermediate SNRs

Uses second-order cone programming for efficient optimization

Demonstrates the effectiveness of the proposed precoding algorithm

Abstract

This study proposes a symbol-level precoding algorithm based on the minimum mean squared error design objective under a strict per antenna power constraint for PSK modulation. The proposed design is then formulated in the standard form of a second-order cone program, allowing for an optimal solution via the interior point method. Numerical results indicate that the proposed design is superior to the existing approaches in terms of bit-error-rate for the low and intermediate SNR regime.