Generalized DoF of the symmetric K-user interference channel under finite precision CSIT
Generalized DoF of the symmetric K-user interference channel under finite precision CSIT
复制标题
有限精度CSIT下对称K用户干扰信道的广义DoF
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
S. Jafar
中科院分区：
文献类型：
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作者：
Arash Gholami Davoodi;S. Jafar
在有限精度信道状态信息条件下，得到了对称k用户干扰信道的广义自由度（gdf）特征。对称设置是指每个交叉通道能够携带α自由度（DoF），而每个直接通道能够携带1自由度。值得注意的是，在有限精度CSIT下，对称k用户干扰信道失去了干扰对准的所有gof优势。每个用户的gof随着用户数量的增加而减少，除了在非常强（每个接收器解码所有消息的最佳条件）和非常弱（将所有干扰视为噪声的最佳条件）的干扰制度下。结果与之前在完美CSIT下的对称设置下的工作形成鲜明对比，其中每个用户的gof由于干扰对准而保持不变。该结果也与之前在有限精度CSIT下的非对称设置子集上的工作形成对比，即拓扑干涉管理问题，其中干涉对准起着至关重要的作用，并提供了大量的gof优势。
The generalized degrees of freedom (GDoF) characterization of the symmetric K-user interference channel is obtained under finite precision channel state information at the transmitters (CSIT). The symmetric setting is where each cross channel is capable of carrying α degrees of freedom (DoF) while each direct channel is capable of carrying 1 DoF. Remarkably, under finite precision CSIT the symmetric K-user interference channel loses all the GDoF benefits of interference alignment. The GDoF per user diminish with the number of users everywhere except in the very strong (optimal for every receiver to decode all messages) and very weak (optimal to treat all interference as noise) interference regimes. The result stands in sharp contrast to prior work on the symmetric setting under perfect CSIT, where the GDoF per user remain undiminished due to interference alignment. The result also stands in contrast to prior work on a subclass of asymmetric settings under finite precision CSIT, i.e., the topological interference management problem, where interference alignment plays a crucial role and provides substantial GDoF benefits.