In this paper, a (relay)-aided interference alignment (RIA) strategy was considered based on the benefits offered by relay-based cooperative networks. Along with the benefits offered by cooperative networks, the RIA was shown as a practical solution for a K-user BC network. The relationship between the achievable DoF region of the RIA and the different levels of outdated channel state information (CSI) were derived. The trade-off between the NRIA and RIA were analysed and the specific trade-off region in each outdated CSI assumption was indicated in the numerical results. Through the achievable DoF numerical results, it was recognised that regarding achievable DoF, the RIA outperforms the NRIA in most of the outdated CSI scenarios.

在本文中，基于中继的协作网络所带来的好处，考虑了一种（中继）辅助干扰对齐（RIA）策略。除了协作网络提供的好处外，RIA还显示为K用户BC网络的一种实用解决方案。得出了RIA的DoF区域与过时的通道状态信息（CSI）的不同级别之间的关系。分析了NRIA和RIA之间的权衡，并在数值结果中指出了每个过时的CSI假设中的特定权衡区域。通过可实现的DoF数值结果，我们认识到，就可实现的DoF而言，在大多数过时的CSI方案中，RIA均优于NRIA。