LTE-A下行链路增强型同频干扰消除算法

Advanced Co-channel Interference Cancellation for LTE-A Downlink

在LTE-A系统中,同频组网的方式提高了频谱效率,但同时也带来了强烈的同频干扰。IRC接收机因具有较强的同频干扰消除能力而有效地提高了小区边缘用户的吞吐量,然而,该算法的性能需要信道估计和干扰信号的协方差矩阵估计的准确性来保证。LTE-A系统中的DM-RS携带固定的信息,接收端可以将已知的信号用于估计干扰信号的协方差矩阵,提出了一种基于参考信号DM-RS的方法,仿真结果表明,该方法能提高同频干扰消除算法的性能。

In the LTE-A system, the network with the same frequency improves the frequency efficiency. But it also brings strong co-channel interfer- ence （CCI）. The interference rejection combining （IRC） receiver is effective in improving the cell-edge user throughput because it suppresses inter-cell interference. However,it requires channel estimation and covariance matrix estimation of the inter-cell interference with high accuracy. DM-RS in the LTE-A system carries fixed information. Receiver can use this fixed information to estimate covariance matrix of the inter-cell interference. A scheme which is based on the demodulation reference signal （DM-RS） is proposed in this paper. Simulation results show that this method can improve the per- formance of the algorithm to cancel co-channel interference.