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Sectorization based pilot reuse for improving net spectral efficiency in the multicell massive MIMO system

用于提升多小区大规模MIMO系统净频谱效率的扇区化导频重用

Abstract

A sectorization method using the uniform circular array (UCA) is proposed to improve the net spectral efficiency (SE) of the multicell massive MIMO system, which is an important index for evaluating the performance of a communication system. We derive the ergodic achievable uplink net SE per cell of a general sectorized system and obtain its deterministic approximation based on the large random matrix theory. Different weight matrices are considered for the sectorized system and the one with the best performance is utilized for further analysis. The consistency of the deterministic approximation with the result of Monte-Carlo simulation is proved at the same time. At last, numerical results indicate that the net SE per cell can be greatly improved compared to the conventional multicell massive MIMO system, which validates the effectiveness of the sectorization method. Moreover, comparisons with other pilot reuse methods are also made in this paper.

创新点

本文研究了采用均匀圆形阵列的大规模MIMO系统,并在该场景下提出了一种基于扇区化技术的导频重用策略,该策略可以大大提升多小区大规模MIMO系统净频谱效率。此外,文章基于大规模随机矩阵理论,推导得到了一般性扇区化多小区系统上行可达频谱效率确定性近似表达式,并通过数值仿真验证了该表达式的准确性,其意义在于可以广泛应用于此类型场景下的系统设计以及优化,同时节省了蒙特卡洛仿真所花费的大量时间。

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Correspondence to Shidong Zhou.

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Li, J., Xiao, L., Xu, X. et al. Sectorization based pilot reuse for improving net spectral efficiency in the multicell massive MIMO system. Sci. China Inf. Sci. 59, 1–15 (2016). https://doi.org/10.1007/s11432-015-5503-7

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Keywords

  • massive MIMO
  • multicell
  • net SE
  • pilot reuse
  • sectorization
  • UCA

Keywords

  • 022307

关键词

  • 大规模MIMO
  • 多小区
  • 净频谱效率
  • 导频重用
  • 扇区化
  • 均匀圆形阵列