论文标题
随着时间变化的飞行员的大规模MIMO系统的干扰取消渠道估计
Interference Cancellation Based Channel Estimation for Massive MIMO Systems with Time Shifted Pilots
论文作者
论文摘要
在随时间移动的飞行员（TSP）方案的大量多输入多输出（MIMO）系统中，当基于基站（BS）天线M接近无穷大时，可以消除由试点污染引起的组间干扰。但是，M在实践中是有限的，TSP的有效性受通道估计错误的限制。在本文中，分析表明，TSP的均方通道估计误差（MSCEE）由组间数据干扰主导。为了减少有限天线大规模的MIMO系统中的MSCEE，提出了基于TSP（IC-TSP）的基于干扰取消的通道估计，其中基于BS合作取消了群体间数据干扰。为了显示IC-TSP的优势，通过考虑不同的M和BS-BS通道的相干时间来评估IC-TSP的其他开销。此外，还讨论了部门化和基于压缩感应的BS-BS通道估计的影响。我们表明，当128 <m <2048（从最接近的两个细胞层取消的组间数据干扰）时，IC-TSP在TSP上实现了超过1.2 bps/hz的频谱效率增益。
In massive multiple-input multiple-output (MIMO) systems with time shifted pilot (TSP) schemes, the inter-group interference caused by the pilot contamination can be eliminated when the number of base station (BS) antennas M approaches infinity. However, M is finite in practice and the effectiveness of the TSP is limited by channel estimation errors. In this paper, it is analytically shown that the mean square channel estimation error (MSCEE) of the TSP is dominated by the intergroup data interference. To reduce the MSCEE in the finite antenna massive MIMO systems, an interference cancellation based channel estimation for the TSP (IC-TSP) is proposed, where the dominant inter-group data interference is canceled based on BS cooperation. To show the advantage of the IC-TSP, the additional overhead of IC-TSP is evaluated by considering different M and the coherence time of BS-BS channels. Furthermore, the impact of sectorization and compressed sensing based BS-BS channel estimation are also discussed. We show that when 128 < M < 2048, with the inter-group data interference from the nearest two cell layers being canceled, the IC-TSP achieves a spectral efficiency gain of more than 1.2 bps/Hz over the TSP.
