On the Achievability of Interference Alignment for Three-Cell Constant Cellular Interfering Networks

TL;DR

This paper reveals a new property of interference alignment in three-cell cellular networks, showing solutions from user cooperation can be applied without cooperation, leading to improved degrees of freedom.

Contribution

It introduces a novel property of IA solutions transferable from cooperative to non-cooperative scenarios and proposes a joint beamforming design algorithm.

Findings

More degrees of freedom achieved compared to conventional schemes

The IA solution is applicable in non-cooperative environments

Numerical results validate the effectiveness of the proposed method

Abstract

For a three-cell constant cellular interfering network, a new property of alignment is identified, i.e., interference alignment (IA) solution obtained in an user-cooperation scenario can also be applied in a non-cooperation environment. By using this property, an algorithm is proposed by jointly designing transmit and receive beamforming matrices. Analysis and numerical results show that more degree of freedom (DoF) can be achieved compared with conventional schemes in most cases.