论文标题
使用本地CSIT进行MU-MIMO异质蜂窝网络的分布式编码
Distributed Precoding Using Local CSIT for MU-MIMO Heterogeneous Cellular Networks
论文作者
论文摘要
细胞致密化是提高多Antenna细胞系统中面积光谱效率的关键驱动力。但是，随着基本站（BSS）和共享相同光谱的用户的密度增加，但是，用户间干扰（IUI）和间隙间干扰（ICI）问题都会导致此类系统中光谱效率的显着损失。为了在每个BS的局部通道状态信息的约束下解决此问题，在本文中，我们提出了一种新型的非合作的多用户多输入多输入多输出（MIMO）预编码技术，称为信号 - 交流 - 脉冲脉冲脉冲 - 渗透 - 脉冲 - 脉冲 - 脉冲 - 渗透 - noise-noise-noise-noise-noise-noise-ratio（silnr）最大化预码。我们分布式预编码方法的关键创新是使用发射机（CSIT）的本地通道状态信息最大化每个单元格用户的乘积。我们表明，只有使用局部CSIT的预编码技术才能渐近地实现通过在某些情况下使用全球CSIT进行合作预编码来实现的多细胞合作。我们还提出了一种预编码算法，该算法在多细胞方案中对CSIT错误具有鲁棒性。通过多细胞系统级模拟，我们证明了我们的分布式预码技术优于所有现有的非合作预码方法，并且即使在BSS上使用不太如此的天线，也可以非常紧密地实现多单元的绑定。
Cell densification is a key driver to increase area spectral efficiencies in multi-antenna cellular systems. As increasing the densities of base stations (BSs) and users that share the same spectrum, however, both inter-user-interference (IUI) and inter-cell interference (ICI) problems give rise to a significant loss in spectral efficiencies in such systems. To resolve this problem under the constraint of local channel state information per BS, in this paper, we present a novel noncooperative multi-user multiple-input multiple-output (MIMO) precoding technique, called signal-to-interference-pulse-leakage-pulse-noise-ratio (SILNR) maximization precoding. The key innovation of our distributed precoding method is to maximize the product of SILNRs of users per cell using local channel state information at the transmitter (CSIT). We show that our precoding technique only using local CSIT can asymptotically achieve the multi-cell cooperative bound attained by cooperative precoding using global CSIT in some cases. We also present a precoding algorithm that is robust to CSIT errors in multi-cell scenarios. By multi-cell system-level simulations, we demonstrate that our distributed precoding technique outperforms all existing noncooperative precoding methods considerably and can also achieve the multi-cell bound very tightly even with not-so-many antennas at BSs.
