The Application of MIMO to Non-Orthogonal Multiple Access

TL;DR

This paper explores the integration of MIMO techniques into NOMA systems, proposing new precoding and detection methods, analyzing performance with fixed power allocation, and enhancing system efficiency through user pairing and optimized power strategies.

Contribution

It introduces a novel MIMO-NOMA design with specific precoding and detection matrices, and analyzes the impact of user pairing and power allocation on system performance.

Findings

MIMO-NOMA outperforms conventional schemes in simulations.

User pairing significantly improves system performance.

Optimized power allocation meets diverse QoS requirements.

Abstract

This paper considers the application of multiple-input multiple-output (MIMO) techniques to non-orthogonal multiple access (NOMA) systems. A new design of precoding and detection matrices for MIMO-NOMA is proposed and its performance is analyzed for the case with a fixed set of power allocation coefficients. To further improve the performance gap between MIMO-NOMA and conventional orthogonal multiple access schemes, user pairing is applied to NOMA and its impact on the system performance is characterized. More sophisticated choices of power allocation coefficients are also proposed to meet various quality of service requirements. Finally computer simulation results are provided to facilitate the performance evaluation of MIMO-NOMA and also demonstrate the accuracy of the developed analytical results.