论文标题
分散的MIMO广播频道的DOF地区 - 我们需要多少个知情天线？
DoF Region of the Decentralized MIMO Broadcast Channel -- How many informed antennas do we need?
论文作者
论文摘要
在这项工作中，我们研究了在网络MIMO设置上可在发射机上可用的通道状态信息（CSI）的不完善共享的影响，在该设置中，一组$ M $ Transmit的天线（可能不是共同位置，共同为两名具有$ n_1 $ and $ n_1 $ and $ n_2 $ n_2 $ antennas）的共同服务。我们考虑的情况下，只有$ k $传输天线的子集可以访问Perfect CSI，而其他$ M-K $ Transmit天线仅访问有限的Precision CSI。对这种配置的分析旨在回答一个问题，即一个额外的知情天线可以提供多少帮助。我们将此方案建模为一个分散的MIMO广播频道（BC），并将其特征化（DOF）地区描述，表明只有$ k = \ max（n_1，n_2）$ antennas具有完美的CSI，才能使用无处不在的CSI实现常规BC的DOF。此外，我们通过向额外的发射天线提供CSI来确定获得的DOF的增加。
In this work, we study the impact of imperfect sharing of the Channel State Information (CSI) available at the transmitters on a Network MIMO setting in which a set of $M$ transmit antennas, possibly not co-located, jointly serve two multi-antenna users endowed with $N_1$ and $N_2$ antennas, respectively. We consider the case where only a subset of $k$ transmit antennas have access to perfect CSI, whereas the other $M-k$ transmit antennas have only access to finite precision CSI. The analysis of this configuration aims to answer the question of how much an extra informed antenna can help. We model this scenario as a Decentralized MIMO Broadcast Channel (BC) and characterize the Degrees-of-Freedom (DoF) region, showing that only $k=\max(N_1,N_2)$ antennas with perfect CSI are needed to achieve the DoF of the conventional BC with ubiquitous perfect CSI. Furthermore, we identify the increase of DoF obtained by providing CSI to an extra transmit antenna.
