Coordinated multi-point transmissions based on interference alignment and neutralization
Coordinated multi-point transmissions based on interference alignment and neutralization
复制标题
DOI：
10.1109/infocom.2016.7524371
复制
发表时间：
2016-04
期刊：
影响因子：
--
通讯作者：
Zhao Li;Sha Cui;K. Shin;Jun Gu
中科院分区：
文献类型：
--
作者：
Zhao Li;Sha Cui;K. Shin;Jun Gu
干扰对齐（IA）和干扰中和（IN）都被用于协调多点（CoMP）传输。在基站的配合下，联合设计发射预编码器和接收滤波器，实现多数据流的并发传输。在预处理的设计中，对携带相同数据的干扰信号进行IN处理，使方向相反的干扰信号在一个子空间内对齐。另一方面，对于携带不同信息的干扰，采用IA将它们在子空间中对准相同的方向，从而减少在用户侧观察到的干扰信号维数。接收端根据发射端不同的预编码方案，采用迫零（ZF）算法来恢复期望的数据。所提出的基于干扰对齐和中和的CoMP（IAN-CoMP）机制可以通过仅在基站（BS）侧利用有限且灵活的协作来实现有效的干扰消除和抑制。我们还将该机制扩展到一般情况下，在发射机和接收机侧的天线配置，参与CoMP的发射机的数量和同时服务的用户是可变的。此外，所提出的方案还可以实现灵活的合作开销和系统的可实现的自由度（DoF）之间的权衡。我们深入的仿真结果表明，IAN-CoMP可以显着提高频谱效率（SE）的小区边缘用户。
Both interference alignment (IA) and interference neutralization (IN) are exploited for Coordinated Multi-Point (CoMP) transmissions. With the base station's cooperation, transmit precoder and receive filter are designed jointly, and then concurrent transmissions of multiple data streams are achieved. In the design of preprocessing, IN is applied to the interferences carrying same data so as to align the interfering signals with opposite directions in a subspace. On the other hand, for interferences carrying different information, IA is employed to align them with the same direction in a subspace, thus reducing the interference signal dimension observed at the user side. Based on different precoding schemes at the transmitter's side, receivers adopt zero-forcing (ZF) so as to recover the desired data. The proposed interference alignment and neutralization based CoMP (IAN-CoMP) mechanism can achieve effective interference cancellation and suppression by exploiting limited and flexible collaboration only at the base station (BS) side. We also extend the mechanism to general cases where the antenna configurations at both transmitter and receiver side, the number of transmitters participating in CoMP and simultaneously served users are variable. In addition, the proposed scheme can also achieve a flexible tradeoff between cooperation overhead and the system's achievable degrees of freedom (DoFs). Our in-depth simulation results show that IAN-CoMP can significantly improve the spectral efficiency (SE) for cell-edge users.