多点协同系统中的协同波束赋形干扰抑制

Coordinated Beamforming Interference Suppression in Coordinated Multi-Point Systems

为了解决采用波束赋形多小区系统中波束冲突带来的小区间干扰问题,提出了一种基于特征值的协同波束赋形算法.该算法在各小区用户调度确定的情况下,部分干扰环境较为恶劣的用户要求其服务小区与最强干扰小区协同工作,联合计算在该用户所占用频率上的波束赋形向量.通过这种多点协同技术可达到抑制干扰、采用相同频率用户的可达速率和最大化的目的.仿真结果表明,与各小区独立计算波束赋形向量的方法相比,所提算法能有效提升系统性能.

An eigenvalue based coordinated beamforming algorithm is proposed to mitigate the inter-cell interference aroused by beam collision in beamforming systems. Assuming the scheduling of users has been done in each cell, the users suffering serious interference require their serving cell cooperatively working with their strongest aggressor. The two cells calculate the beamforming vectors for the subcarriers adopted by this user together. With this coordinated multi-point technique, the inter-cell interference is mitigated and the sum of achievable rate of users adopt the same frequency is maximized. Compared with the classical independent beamforming techniques, the proposed algorithm can greatly improve system performance.