IA Solution in Closed-Form for Optimum DoF in the Multi-User MIMO Interference Network

• Weihua Liu,
• Shilin Zhang,
• Wenjun Song,
• Baona Li,
• Lixun Huang,
• Daoying Huang,

Vol. 19, No. 2, February 28, 2025
10.3837/tiis.2025.02.015, Download Paper (Free):

• Degrees of Freedom
• interference alignment
• multiple-input multiple-output
• precoding sub-matrix chain
• solution in closed-form

Abstract

In the wireless communication network, interference alignment (IA) represents a technology for the management of interference that can attain the optimum degrees of freedom (DoF). The iterative IA design is highly complex and requires significant computing resources in multiple-user multiple-input multiple-output (MIMO) communication networks. The IA in closed-form design scheme has low complexity of computation, which hasn’t been solved well in general multiple-user communication networks. A scheme in closed-form is proposed for the multi-user MIMO interference channel, in which an IA solution is employed to eliminate interference by the precoding sub-matrix chain and achieve the optimum DoF further. The precoding sub-matrix chain is precisely designed, and the exact solution in closed-form is obtained by the solution of linear equations. Eventually, the efficacy of the designed solution scheme is validated through simulation experiments.

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