Model Transformation Based Closed-Form IA Design for Multiple-Cell MIMO Cellular Networks.

To apply the interference alignment (IA) technology to practical communication networks effectively, the low complexity IA design problem still needs to be solved well. In this paper, we study the low complexity closed-form IA design method, for the multiple-cell multiple-user multiple-input multiple-output (MIMO) cellular interference network. To eliminate the complex interference conveniently, the multiple-cell multiple-user cellular network model is transformed into several relatively simple network models. Based on the model transformation of the cellular network, the IA precoding is divided into two parts. Then the two-stage IA design scheme is proposed, which includes the outer IA design and inter one. The former is to eliminate the inter-cell interference, while the latter is to eliminate the inter-user interference. Simulation results show the higher system sum-rate performance and low computational complexity of the proposed IA design scheme. [ABSTRACT FROM AUTHOR]