Optimally bridging the gap from delayed to perfect CSIT in the K-user MISO BC
Optimally bridging the gap from delayed to perfect CSIT in the K-user MISO BC
复制标题
最佳地弥合 K-user MISO BC 中从延迟到完美 CSIT 的差距
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
P. Elia
中科院分区：
文献类型：
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作者：
Paul de Kerret;D. Gesbert;Jingjing Zhang;P. Elia
本研究<sup> </sup>导出了具有延迟发送端信道状态信息（CSIT）和附加电流噪声CSIT的K-User MISO广播信道（BC）的最优自由度（DoF），其中对于α∈[0,1]，信道估计误差范围为P<sup>-α</sup>。最优和DoF为（1 - α）K/H<sub>K</sub> + αK，其中H<sub>K =</sub>△Σ<sub> K =1</sub><sup>K</sup>1/ K。这种最佳性能是一种新方案的结果，该方案偏离了现有的努力，因为它以数字方式组合干扰，解码MAT对齐[1]中任何顺序的符号，并利用分层量化器，其输出分布在各个轮中，以最小化不必要干扰的方式。它们首次共同实现了MAT和ZF难以捉摸的dof最优组合。
This work<sup>1</sup> derives the optimal Degrees-of-Freedom (DoF) of the K-User MISO Broadcast Channel (BC) with delayed Channel-State Information at the Transmitter (CSIT) and with additional current noisy CSIT where the channel estimation error scales in P<sup>-α</sup> for α ∈ [0, 1]. The optimal sum DoF takes the simple form (1 - α)K/H<sub>K</sub> + αK where H<sub>K =</sub>△ Σ<sub>k=1</sub><sup>K</sup>1/k. This optimal performance is the result of a novel scheme which deviates from existing efforts as it digitally combines interference, decodes symbols of any order in the MAT alignment [1], and utilizes a hierarchical quantizer whose output is distributed across rounds in a way that minimizes unwanted interference. These jointly deliver, for the first time, the elusive DoF-optimal combining of MAT and ZF.