【摘要】 提出了一种用于下行协作多点系统联合传输的和空间干扰对齐(IA)机制.利用多小区联合预编码将从不同基站到同一用户的干扰对齐到一个特定维度的空间中,实现干扰空间的压缩;然后在接收端设计干扰抑制矩阵消除多用户间干扰.从系统自由度(DoF)的角度理论分析了和空间IA机制的性能,给出了系统可达DoF上界,以及干扰信号压缩维度与系统可达DoF的关系.数值仿真将和空间IA机制与传统正交机制和经典IA机制进行对比,验证了和空间IA机制可以获得更高的DoF与数据速率.更多还原

【Abstract】 A sum-space interference alignment( IA) scheme for downlink coordinated multi-point joint transmission system was proposed. The interference from the collaborative base stations to each user equipment was aligned onto a space of specific dimension,which was accomplished by joint precoding for multiple coordinated cells,and then the interference space was compressed. The interference can be eliminated by interference suppression matrix which was designed at the each user equipment side. In the performance analysis,the outer bound of the system total achievable degree of freedom( DoF) was derived,and the relationship between the achievable DoF and the dimensions of the aligned interference space was given. Numerical analysis shows that the sum-space IA scheme can obtain more DoF and data rate compared with traditional orthogonal schemes and traditional IA schemes.更多还原