协作多点系统的本地预编码改进算法

Improved Local Precoding Scheme for Coordinated Multi-Point Transmission Systems

为了提高LTE-Advanced系统小区边缘用户的吞吐量,在现有协作多点(CoMP)传输方案基础上提出了一种CoMP系统的本地预编码改进算法,以解决传统本地预编码算法在高秩(秩不小于2)信道下的层间干扰问题.该方法在发射端有选择地引入层交换与相位校正操作,并按照接收端信干噪比最大的准则确定交换及校正策略.仿真结果表明,改进算法能有效提高小区边缘用户的谱效率,进而增大小区边缘用户的吞吐量.

To improve the throughput of terminals at cell edge in LTE Advanced systems, an improved lo cal precoding scheme was proposed for coordinated multi-point （CoMP） transmission systems based on the existing methods, which can solve the problem of inter-layer interference when traditional local precoding is applied in high rank channel, i.e. the rank is larger than 1. The proposed scheme introduces layers swapping and phase correction selectively to the transmitting end, which is determined by maximizing the signal-to-interference plus noise at the receiving end. The simulation results show that the proposed scheme can improve the spectral efficiency of users at cell edge, and then improve their throughput.