System Level Performance of Downlink MU-MIMO Transmission for 3GPP LTE-Advanced
System Level Performance of Downlink MU-MIMO Transmission for 3GPP LTE-Advanced
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3GPP LTE-Advanced 下行链路 MU-MIMO 传输的系统级性能
DOI：
10.1109/vetecs.2010.5493979
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Satoshi Nagata
中科院分区：
文献类型：
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作者：
Katsutoshi Kusume;G. Dietl;T. Abe;H. Taoka;Satoshi Nagata
我们研究增强下行链路多用户多输入多输出（MU-MIMO）传输方案的3GPP LTE-高级的系统级仿真的基础上。与Rel相比。8LTE单用户MIMO（SU-MIMO），MU-MIMO在某些场景中具有更好地利用MIMO信道的空间维度的潜力。虽然Rel。8LTE定义了简单的MU-MIMO模式，目前针对Rel. 10 LTE-Advanced进一步提高频谱效率。在本文中，我们专注于迫零（ZF）MU-MIMO预编码与显式信道量化机制称为信道矢量量化（CVQ）。此外，我们考虑两种不同的标准CVQ在接收端：最小化欧几里德距离或最大化信号干扰加噪声功率比（SINR）。许多系统级仿真揭示了ZF MU-MIMO与Rel.图8示出了当基站（eNB）处的空间相关性相对较高时，在小区吞吐量和小区边缘用户吞吐量两者方面的LTE SU/MU-MIMO。当CVQ基于SINR最大化准则而不是欧氏距离最小化准则时，ZF MU-MIMO的潜在增益被示出为进一步改善。
We investigate enhanced downlink multiuser multiple input multiple output (MU-MIMO) transmission schemes for 3GPP LTE-Advanced based on system level simulations. As compared to Rel. 8 LTE single user MIMO (SU-MIMO), MU-MIMO has the potential to better exploit the spatial dimension of MIMO channels in some scenarios. Although Rel. 8 LTE defines a simple MU-MIMO mode, more advanced MU-MIMO techniques are currently discussed towards Rel. 10 LTE-Advanced to further improve the spectral efficiency. In this paper, we focus on zero-forcing (ZF) MU-MIMO precoding with an explicit channel quantization mechanism called channel vector quantization (CVQ). Moreover, we consider two different criteria of CVQ at the receiver: either minimizing Euclidean distance or maximizing the signal to interference plus noise power ratio (SINR). A number of system level simulations reveal significant potential gains of ZF MU-MIMO as compared to those of Rel. 8 LTE SU/MU-MIMO in terms of both cell throughput and cell-edge user throughput when the spatial correlations at the base station (eNB) are relatively high. The potential gain of ZF MU-MIMO is shown to be further improved when the CVQ is based on the SINR maximization criterion instead of Euclidean distance minimization.