On the Degrees of Freedom region of general MIMO Broadcast Channel with mixed CSIT
On the Degrees of Freedom region of general MIMO Broadcast Channel with mixed CSIT
复制标题
混合CSIT通用MIMO广播信道的自由度区域
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Yingzhuang Liu
中科院分区：
文献类型：
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作者：
Bo Yang;Desheng Wang;Jun Sun;Yingzhuang Liu
本文研究了在一般天线配置下具有混合CSIT（即延迟CSIT加估计电流CSIT）的双用户多输入多输出（MIMO）高斯广播信道（BC）。与MISO场景不同，对于一般MIMO BC设置，获得自由度（DoF）区域的严格表征似乎很困难。尽管如此，我们在本文中提供的内界被认为是迄今为止最好的可实现界。该方案的一个新颖之处是干扰编码符号的速率分裂，它通过适应非对称接收机的传输提供了可能的DoF增益。此外，还给出了自由度区域的外边界，在某些情况下与我们提出的内边界相吻合。
The two-user multiple-input multiple-output (MIMO) Gaussian Broadcast Channel (BC) with mixed CSIT (i.e., delayed CSIT plus estimated current CSIT) under general antenna configuration is considered in this paper. Unlike the MISO scenario, obtaining tight characterization of the Degrees of Freedom (DoF) region seems difficult for the general MIMO BC settings. Despite that, the inner bound we provide in this paper is believed to be the best achievable bound so far. One novel ingredient of our scheme is the rate-splitting of the interference-encoded symbols, which provides the possible benefit of DoF gain by accommodating the transmission to the asymmetric receivers. Moreover, the outer bound of DoF region is also presented, which coincides our proposed inner bound in some cases.