由于频谱资源的日益紧张，为了满足对更高数据速率的需求，在新一代无线蜂窝网络中，引入了高频谱效率的多天线技术，并尽可能采用频率复用因子为 1 的组网（异构网）方式。然而，这会不可避免地带来各类严重的干扰，从而使得系统性能严重恶化。干扰对齐抑制技术提供了一种有效的异构网络干扰消除方法，但已有的干扰抑制方法由于复杂网络场景和未知复杂信道特性等原因，应用到实际通信系统中存在很大困难。由于实际相关性衰落环境的信道状态信息(CSI)很难准确获取，异构无线网络复杂干扰的抑制具有巨大挑战性，同时也具有很大的理论意义和实用价值。本项申请的主要研究内容如下：（1）相关性衰落信道与非完备CSI条件下干扰抑制极限性能与约束关系；（2）非完备CSI下干扰抑制优化求解方法；（3）适用于异构网络的分组/分层干扰抑制方案设计；（4）异构网络场景下自适应干扰抑制方案设计。

In order to meet the increasing demand for higher data rate, due to the scarce spectrum resources, spectrum-efficient techniques, such as multiple antennas and heterogeneous networking with a frequency reuse factor of 1, have been introduced in the new generation of wireless cellular networks. However, as a result, it will inevitably cause various types of serious interference, resulting degrading system performance drastically. Interference alignment elimination technique provides an effective approach for heterogeneous networks (HetNets) interference cancellation, but the existing interference elimination techniques are difficult to be employed in practical communications networks because of the complicated network scenarios and the unknown channel characteristics. Since it is extremely difficult to obtain the accurate channel state information (CSI) for actual correlated fading channels, the heterogeneous network interference elimination is a big challenge, and hence also has great theoretical value and practical significance. Thus, this research proposal will investigate the following contents: (1) the theoretical limits and governing relationship of interference elimination over correlated fading channels with imperfect CSI; (2) solving methods of optimization problem of interference elimination in the presence of imperfect CSI; (3) design of grouping/hierarchical interference rejection schemes for HetNets; (4) design of adaptive interference rejection schemes for HetNets.