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首页> 外文期刊>Information Theory, IEEE Transactions on >Achievable DoF-Delay Trade-Offs for the K -user MIMO Interference Channel With Delayed CSIT
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Achievable DoF-Delay Trade-Offs for the K -user MIMO Interference Channel With Delayed CSIT

机译：具有CSIT延迟的K用户MIMO干扰信道可实现的DoF延迟权衡

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摘要

The degrees of freedom (DoFs) of the K -user multiple-input multiple-output (MIMO) interference channel are studied when perfect, but delayed channel state information is available at the transmitter side (delayed CSIT). Recent works have proposed schemes improving the DoF knowledge of the interference channel, but at the cost of developing transmission involving many channel uses (long delay), thus increasing the complexity at both transmitter and receiver side. This paper proposes three linear precoding strategies, limited to at most three phases, based on the concept of interference alignment, and built upon three main ingredients: delayed CSIT precoding, user scheduling, and redundancy transmission. In this respect, the interference alignment is realized by exploiting delayed CSIT to align the interference at the non-intended receivers along the space-time domain. Moreover, a new framework is proposed where the number of transmitted symbols and duration of the phases is obtained as the solution of a maximization problem, and enabling the introduction of complexity constraints, which allows deriving the achievable DoF as a function of the transmission delay, i.e., the achievable DoF-delay trade-off. Finally, the latter part of this paper settles that the assumption of time-varying channels common along all the literature on delayed CSIT is indeed unnecessary.
机译：完善时研究K用户多输入多输出（MIMO）干扰信道的自由度（DoF），但是在发射机端（延迟CSIT）可以使用延迟的信道状态信息。最近的工作提出了改进干扰信道的DoF知识的方案，但是以开发涉及许多信道用途的传输（长延迟）为代价，因此增加了发射机和接收机侧的复杂性。本文基于干扰对齐的概念，提出了三种线性预编码策略，最多限于三个阶段，并基于三个主要因素：延迟CSIT预编码，用户调度和冗余传输。在这方面，通过利用延迟的CSIT来沿时空域对齐非预期接收器处的干扰，从而实现干扰对齐。此外，提出了一个新的框架，其中获得了传输符号的数量和相位的持续时间作为最大化问题的解决方案，并允许引入复杂性约束，从而允许根据传输延迟推导可实现的DoF，即，可实现的DoF延迟权衡。最后，本文的后半部分认为，对于所有关于延迟CSIT的文献，都普遍采用时变信道这一假设确实没有必要。

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