On the degrees of freedom of the K-user MISO interference channel with imperfect delayed CSIT
On the degrees of freedom of the K-user MISO interference channel with imperfect delayed CSIT
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DOI：
10.1109/icassp.2014.6853778
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发表时间：
2014-03
期刊：
影响因子：
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通讯作者：
Marc Torrellas;A. Agustin;J. Vidal
中科院分区：
文献类型：
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作者：
Marc Torrellas;A. Agustin;J. Vidal
这项工作研究了发射机处不完美延迟信道状态信息 (dCSIT) 的 K 用户多输入单输出 (MISO) 干扰信道 (IC) 的自由度 (DoF)。对于此设置，提供了新的 DoF 内部边界，并以基于合作的外部边界为基准。可实现的结果基于预编码方案，该方案利用回顾性干扰对准（RIA）的概念，随时间对准干扰接收信号。所提出的方法优于所有先前已知的方案。此外，我们在所报告的 dCSIT 上研究了信道估计误差 (CEE) 下提出的方案，并推导了具有不完美 dCSIT 时可实现的 DoF 的封闭式表达式。
This work investigates the degrees of freedom (DoF) of the K-user multiple-input single-output (MISO) interference channel (IC) with imperfect delayed channel state information at the transmitters (dCSIT). For this setting, new DoF inner bounds are provided, and benchmarked with cooperation-based outer bounds. The achievability result is based on a precoding scheme that aligns the interfering received signals through time, exploiting the concept of Retrospective Interference Alignment (RIA). The proposed approach outperforms all previous known schemes. Furthermore, we study the proposed scheme under channel estimation errors (CEE) on the reported dCSIT, and derive a closed-form expression for the achievable DoF with imperfect dCSIT.