On the Degrees of Freedom of Interference Broadcast Channels With Topological Interference Management
On the Degrees of Freedom of Interference Broadcast Channels With Topological Interference Management
复制标题
DOI：
10.1109/tcomm.2016.2533488
复制
发表时间：
2016-02
影响因子：
8.3
通讯作者：
Paula Aquilina;T. Ratnarajah
中科院分区：
文献类型：
--
作者：
Paula Aquilina;T. Ratnarajah
拓扑干扰管理是对通信网络中可达到的速率的研究，除了网络结构本身的知识之外，在发射机（CSIT）没有信道状态信息。在这项工作中，我们研究了具有交替连接和全局拓扑干扰管理的双小区双用户每小区干扰广播信道（IBC）的自由度（DoF）。拓扑信息允许发射机跟踪变化的网络拓扑并利用变化的连接状态来实现DoF增益。我们推导了具有交替连通性的两小区双用户每小区IBC的新颖自由度外界。该分析针对不同的系统配置进行，即单输入单输出（SISO）、多输入单输出（MISO）和多输入多输出（MIMO）系统。虽然全局信道知识总是仅限于拓扑信息，但我们引入了一个混合CSIT设置，其中根据系统配置考虑不同程度的本地CSIT可用性。此外，我们研究了所得边界的可实现性，并提出了基于跨状态联合编码的新传输方案。结果表明，在没有全局拓扑信息的情况下，可以获得比传统方法更高的DoF，这表明即使是最低水平的全局CSIT仍然是非常有用的。
Topological interference management is the study of achievable rates within communication networks with no channel state information at the transmitter (CSIT) beyond knowledge of the network structure itself. In this work, we study the degrees of freedom (DoF) of a two-cell two-user-per-cell interference broadcast channel (IBC) with alternating connectivity and global topological interference management. The topological information allows transmitters to track the changing network topology and exploit the varying connectivity states to achieve a DoF gain. We derive novel DoF outer bounds for the two-cell two-user-per-cell IBC with alternating connectivity. This analysis is carried out for different system configurations, namely, single-input single-output (SISO), multiple-input single-output (MISO), and multiple-input multiple-output (MIMO) systems. While global channel knowledge is always restricted to topological information only, we introduce a mixed CSIT setting where varying degrees of local CSIT availability are considered depending on the system configuration. Additionally, we investigate the achievability of the derived bounds and propose new transmission schemes based on joint coding across states. Results show that DoF higher than those conventionally obtained without global topological information are achievable, indicating that even such a minimal level of global CSIT is still highly useful.