| 摘要: |
| 干扰对齐实施过程中所需的大量反馈开销严重制约了其实际应用。反馈拓扑能够有效降低干扰对齐的信道状态信息（Channel State Information，CSI）获取开销。针对K用户多输入多输出（Multiple-Input Multiple-Output，MIMO）干扰信道，为了在低时延下进一步降低反馈拓扑的CSI开销，在用户数目相对较多的情况下（K≥6）提出了一种新的反馈拓扑结构。相比现有7种反馈拓扑中CSI开销最低的方案，所提反馈拓扑仅需其一半的时隙数目且在K≥7时具有更低的CSI开销。分析表明所提反馈拓扑能够实现CSI开销降低和时延缩减之间的有效折中。 |
| 关键词: MIMO干扰信道 干扰对齐 信道状态信息 反馈拓扑 |
| DOI：10.20079/j.issn.1001-893x.220113004 |
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| 基金项目: |
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| Feedback topology design with reduced CSI overhead and delay for MIMO interference alignment |
| JIN Jin,ZHAO Yanan,CHEN Shengwei |
| (School of Electrical and Information Engineering,Zhengzhou University,Zhengzhou 450001,China) |
| Abstract: |
| The large amount of feedback overhead for implementing interference alignment(IA) seriously restricts the practical application of IA.The feedback topology can effectively reduce the channel state information(CSI) acquisition overhead for IA.For a K-user multiple-input multiple-output(MIMO) interference channel,in order to further reduce the CSI overhead of the feedback topology while guaranteeing low time delay,a new feedback topology with relatively large number of users(K≥6) is proposed.Compared with the scheme with the lowest CSI cost in the existing seven feedback topologies,the proposed feedback topology not only needs half the number of time slots but also has lower CSI overhead when K≥7. The analysis shows that the proposed feedback topology can achieve an effective trade-off between CSI overhead reduction and the decrease of time delay. |
| Key words: MIMO interference channel interference alignment channel state information feedback topology |
