Block-fading broadcast channel with hybrid CSIT and CSIR
Block-fading broadcast channel with hybrid CSIT and CSIR
复制标题
具有混合 CSIT 和 CSIR 的块衰落广播信道
DOI：
--
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Aria Nosratinia
中科院分区：
文献类型：
--
作者：
Mohamed Fadel;Aria Nosratinia
广播信道下延迟，混合，混合，或没有CSIT是一个非常感兴趣的主题，但已研究仅在i.i.d.衰落和所有用户的完美CSIR。超越身份识别的模型。衰落和完美的CSIR具有实际的重要性，因为由于不同的移动性和散射环境，用户可能经历不相等的衰落块长度（相干时间）和不相等的CSIR可用性。本文研究了具有混合CSIR的两用户MISO广播信道，其中一个静态用户（具有较慢衰落）具有CSIR，而一个动态用户（具有较快衰落）不具有自由CSIR。在这种混合CSIR条件下，本文研究了各种CSIT场景下的自由度：没有，延迟，和混合CSIT。对于没有CSIT，我们提供了一个外部边界，满足可实现的自由度区域时，用户的相干时间是相同的。对于延迟CSIT和混合CSIT，可实现区域部分满足其相应的外边界，并且相应的间隙随着动态用户相干时间而减小。
The broadcast channel under delayed, mixed, hybrid, or no CSIT Is a subject of much Interest but has been studied only under i.i.d. fading and perfect CSIR for all users. Models that go beyond i.i.d. fading and perfect CSIR are of practical Importance since users may experience unequal fading block-length (coherence time) and unequal CSIR availability due to different mobility and scattering environment. This paper studies a two-user MISO broadcast channel with hybrid CSIR, where one static user (with slower fading) has CSIR and one dynamic user (with faster fading) does not have free CSIR. Under this hybrid CSIR condition, the paper studies the degrees of freedom under various CSIT scenarios: no, delayed, and hybrid CSIT. For no CSIT, we provide an outer bound that meets the achievable degrees of freedom region when the coherence times of the users are the same. For both delayed and hybrid CSIT, the achievable regions partially meet their corresponding outer bounds, and furthermore the corresponding gaps decrease with the dynamic user coherence time.