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针对多用户正交频分多址系统,提出了一种改进的下行空域干扰协调方案,该方案利用最小均方误差预编码来消除扇区间的同频干扰,改善边缘用户性能,并将最大化信号强度与最小化干扰泄露这2个目标函数分离到不同的资源上进行优化,简化了发射预编码矩阵的设计.系统级仿真结果表明,在发射端获得完整信道状态信息时,空域干扰协调方案可以减轻扇区间干扰,而并不引入扇区总吞吐量的损失.在码本大小、反馈粒度引起的信道状态信息不完全时,所提方案仍具有很好的性能增益.
Aiming at multi-user orthogonal frequency division multiple access system, this paper proposes an improved coordination scheme for downlink airspace interference, which uses minimum mean square error precoding to eliminate inter-sector co-channel interference, improve edge user performance and maximize Signal strength and minimized interference leakage are separated into different resources to optimize the design of the transmit precoding matrix.The system-level simulation results show that when the transmitter obtains the complete channel state information, the space-domain interference coordination scheme Which can reduce the inter-sector interference without introducing the loss of the total throughput of the sector.The proposed scheme still has good performance gain when the channel state information caused by the codebook size and feedback granularity is not complete.