Interference Alignment for Multicell Multiuser MIMO Uplink Channels

TL;DR

This paper introduces a linear interference alignment scheme for multicell multiuser MIMO uplink channels that optimizes degrees of freedom by effectively aligning interference, outperforming existing methods in many scenarios.

Contribution

It presents a novel linear interference alignment scheme for uplink multicell MIMO networks with a closed-form DoF expression and demonstrates its optimality and superiority over related schemes.

Findings

Achieves the optimal degrees of freedom in certain scenarios.

Provides higher total DoF than related schemes in most cases.

Offers a closed-form expression for the total DoF.

Abstract

This paper proposes a linear interference alignment (IA) scheme which can be used for uplink channels in a general multicell multiuser MIMO cellular network. The proposed scheme aims to align interference caused by signals from a set of transmitters into a subspace which is established by the signals from only a subset of those transmitters, thereby effectively reducing the number of interfering transmitters. The total degrees of freedom (DoF) achievable by the proposed scheme is given in closed-form expression, and a numerical analysis shows that the proposed scheme can achieve the optimal DoF in certain scenarios and provides a higher total DoF than other related schemes in most cases.