Spectral Efficiency in Large Intelligent Surfaces: Asymptotic Analysis under Pilot Contamination
Spectral Efficiency in Large Intelligent Surfaces: Asymptotic Analysis under Pilot Contamination
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DOI：
10.1109/globecom38437.2019.9013789
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发表时间：
2019-12
期刊：
影响因子：
--
通讯作者：
Minchae Jung;W. Saad;G. Kong
中科院分区：
文献类型：
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作者：
Minchae Jung;W. Saad;G. Kong
大型智能表面（LISs）已经成为一种新的、有前途的无线通信范例，它依赖于为人造结构（如墙壁）配备大量天线。然而，尽管它们有潜在的好处，但缺乏对LIS系统性能限制的基本分析。本文在实际框架结构和LIS环境下，对上行LIS系统的系统频谱效率（SSE）进行了渐近分析。为了量化试点污染对SSE的影响，本文对多lis系统的SSE进行了渐近研究，并推导了其性能的理论界。仿真结果表明，在大量天线存在的情况下，导出的分析结果与精确互信息非常吻合。此外，结果表明，即使LIS配备了无限数量的天线，可实现的SSE也受到导频污染和通过视线路径的内部/内部干扰的影响。
Large intelligent surfaces (LISs) have emerged as a new and promising wireless communication paradigm that relies on equipping man-made structures such as walls with a massive number of antennas. However, despite their potential benefits, a fundamental analysis on the performance limits of LIS systems is lacking. In this paper, the system spectral efficiency (SSE) of an uplink LIS system is asymptotically analyzed under a practical frame structure and LIS environment. In order to quantify the impact on the SSE of pilot contamination, the SSE of a multi-LIS system is asymptotically studied and a theoretical bound on its performance is derived. Simulation results show that the derived analyses are in close agreement with the exact mutual information in presence of a large number of antennas. Moreover, the results show that the achievable SSE is limited by the effect of pilot contamination and intra/inter-LIS interference through the line-of-sight path, even if the LIS is equipped with an infinite number of antennas.