Interference alignment using a MIMO relay and partially-adapted transmit/receive filters
Interference alignment using a MIMO relay and partially-adapted transmit/receive filters
复制标题
DOI：
10.1109/wcnc.2012.6214410
复制
发表时间：
2012-04
期刊：
影响因子：
--
通讯作者：
Hussein Al-Shatri;R. S. Ganesan;A. Klein;T. Weber
中科院分区：
文献类型：
--
作者：
Hussein Al-Shatri;R. S. Ganesan;A. Klein;T. Weber
为了在干扰信道中实现最大的自由度，提出了干扰对准方法。本文考虑了一种由多对天线节点和一个MIMO中继组成的场景，该中继有助于干扰对准。在随后的两个传输阶段中，假设在两个传输阶段中存在时不变信道，则进行干涉对准。首先，中继和目的节点接收来自所有源节点的信号，即利用通信节点对之间的直接链路。在第二个传输阶段，源节点和中继都将信号重新传输到目的节点。通过调整继电器的线性信号处理，并将发送和接收滤波器部分地调整到信道中，得到了干扰对准的封闭形式解。通过仿真研究了该方案的性能。结果表明，该方案在高信噪比下实现了最大的自由度，优于传统的中继方案。
Interference alignment is proposed for achieving the maximum degrees of freedom in interference channels. In the present paper, a scenario consisting of several pairs of multiple antenna nodes and a single MIMO relay helping the interference alignment is considered. The interference alignment is performed in two subsequent transmission phases assuming a time-invariant channel during the two transmission phases. Firstly, the relay and the destination nodes receive the signals from all the source nodes, i.e., also the direct links between the communicating node pairs are exploited. In the second transmission phase, both the source nodes and the relay retransmit the signals to the destination nodes. By adapting the relay's linear signal processing and partially adapting both the transmit and receive filters to the channel, a closed form solution for interference alignment is obtained. The performance of the proposed scheme is investigated by simulations. The results show that the proposed scheme achieves the maximum degrees of freedom and outperforms conventional relaying schemes at high SNRs.