MIMO干扰对齐中低开销反馈拓扑设计

A feedback topology with low overhead in MIMO interference alignment

干扰对齐是一种解决无线通信系统的干扰问题、提升系统容量的重要技术。但实施干扰对齐需要发送端已知全局信道状态信息。为解决在多用户MIMO干扰信道场景下实施干扰对齐会产生大量信道状态信息开销的问题,提出了连续干扰对齐反馈拓扑设计。该反馈拓扑依据用户数目设置了多对干扰对齐发送端,并连续性地执行干扰信号对齐,能够有效降低信道状态信息开销。对比已有反馈拓扑,结果表明,当用户数目K≥6时,所提的连续干扰对齐反馈拓扑能够以最低的信道状态信息开销去实现干扰对齐,这更有利于干扰对齐技术的实际应用。

Interference alignment is an important technique for mitigating interference and enhancing the capacity of wireless communication networks.However,to implement interference alignment,the transmitters need to know the global channel state information,which incurs substantial overhead.In order to tackle this challenge,a successive interference alignment feedback topology for the K⁃user MIMO interference channel is presented in this study.In the successive interference alignment feedback topology,multiple pairs of interference alignment transmitters are designated based on the number of users.By sequentially aligning interference signals,this approach can effectively reduce the channel state information overhead.Compared with existing feedback topologies,the proposed successive interference alignment feedback topology is capable of implementing interference alignment with the lowest channel state informationoverhead when K≥6,leading to the fact that it is more suitable for the practical application of interference alignment.