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中文摘要：
基于干扰协调（IA）方法，通过级联小区间干扰抑制预编码矩阵P与小区内用户间干扰抑制预编码矩阵，能显著提高小区边缘用户的速率．然而，此方法只能针对固定位置用户设计，而实际系统用户在小区中是随机分布的．针对此问题，提出了一种动态模式切换（DMS）方式．小区中的所有用户根据各自受到干扰的情况，计算一阈值并自行选择工作模式（IA—MMSE或MF模式），基站分别对2组不同模式的用户进行机会调度．仿真结果表明，此方式既能提升小区边缘用户的速率，又保证了小区中心用户的速率不受影响．并通过优化矩阵P，进一步提高了小区边缘用户的速率．
英文摘要：
Based on the interference alignment （IA） method, by cascading the inter-cell interference rejection matrix P before the intra-cell interference rejection matrix, the rates of cell edge users can be improved obviously. However, this method can only be designed for users at a fixed position; however, users are randomly distributed in real cellular systems. So, a dynamic mode switch （DMS） scheme is proposed. The users in a cell calculate a threshold according to its suffered interferences and choose the preferred mode accordingly （IA-MMSE or MF scheme）, and opportunistic dispatch is performed at the base stations for two groups. Simulation shows that the DMS scheme can achieve the improved performance of the cell edge users without affecting the rates of the cell center users. At the same time, the rates of the cell edge users are further improved through the optimization of matrix P.
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