Joint Interference Alignment and Bi-Directional Scheduling for MIMO Two-Way Multi-Link Networks

TL;DR

This paper proposes a joint optimization approach combining interference alignment, bi-directional scheduling, and linear transceiver design for MIMO two-way multi-link networks, significantly reducing interference and improving system performance.

Contribution

It introduces a simple algorithm for joint optimization of transmission order and linear transceivers in multi-link MIMO two-way systems, enhancing interference mitigation.

Findings

The proposed algorithm effectively reduces interference leakage.

Numerical results show improved network performance.

Joint optimization outperforms separate strategies.

Abstract

By means of the emerging technique of dynamic Time Division Duplex (TDD), the switching point between uplink and downlink transmissions can be optimized across a multi-cell system in order to reduce the impact of inter-cell interference. It has been recently recognized that optimizing also the order in which uplink and downlink transmissions, or more generally the two directions of a two-way link, are scheduled can lead to significant benefits in terms of interference reduction. In this work, the optimization of bi-directional scheduling is investigated in conjunction with the design of linear precoding and equalization for a general multi-link MIMO two-way system. A simple algorithm is proposed that performs the joint optimization of the ordering of the transmissions in the two directions of the two-way links and of the linear transceivers, with the aim of minimizing the interference leakage power. Numerical results demonstrate the effectiveness of the proposed strategy.