Exploring IA Feasibility in MIMO Interference Networks: Equalized and Non-Equalized Antennas Approach

Weihua LIU  Zhenxiang GAO  Ying WANG  Zhongfang WANG  Yongming WANG  

IEICE TRANSACTIONS on Communications   Vol.E101-B   No.9   pp.2047-2057
Publication Date: 2018/09/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2017EBP3426
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
MIMO interference networks,  interference alignment,  equalized antenna,  feasibility,  sufficient and necessary condition,  

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For general multiple-input multiple-output (MIMO) interference networks, determining the feasibility conditions of interference alignment (IA) to achieve the maximum degree of freedom (DoF), is tantamount to accessing the maximum spatial resource of MIMO systems. In this paper, from the view of antenna configuration, we first explore the IA feasibility in the K-user MIMO interference channel (IC), G-cell MIMO interference broadcast channel (IBC) and interference multiple access channel (IMAC). We first give the concept of the equalized antenna, and all antenna configurations are divided into two categories, equalized antennas and non-equalized ones. The feasibility conditions of IA system with equalized antennas are derived, and the feasible and infeasible regions are provided. Furthermore, we study the correlations among IC, IBC and IMAC. Interestingly, the G-cell MIMO IBC and IMAC are two special ICs, and a systemic work on IA feasibility for these three interference channels is provided.