北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2020, Vol. 43 ›› Issue (1): 1-7.doi: 10.13190/j.jbupt.2019-052

• 论文 •    下一篇

大规模3D MIMO中基于信道相关的LOS/NLOS识别算法

李君瑶, 常永宇, 曾天一   

  1. 北京邮电大学 信息与通信工程学院, 北京 100876
  • 收稿日期:2019-04-04 出版日期:2020-02-28 发布日期:2020-03-27
  • 通讯作者: 常永宇(1963-),女,博士生导师,E-mail:yychang@bupt.edu.cn. E-mail:yychang@bupt.edu.cn
  • 作者简介:李君瑶(1994-),男,硕士生.
  • 基金资助:
     

Channel Correlation Based LOS/NLOS Identification for 3D Massive MIMO Systems

LI Jun-yao, CHANG Yong-yu, ZENG Tian-yi   

  1. School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2019-04-04 Online:2020-02-28 Published:2020-03-27
  • Supported by:
     

摘要: 为了提高易受视距(LOS)和非视距(NLOS)传输影响无线应用的性能,对大规模三维多输入多输出(3D MIMO)系统中的LOS/NLOS识别进行了研究,针对实际场景,采用实际信道而非通常假设的理想准确信道,提出了一种改进的时-空-频信道相关识别算法TSFCI-1.识别过程包括3个阶段:根据LOS/NLOS用户不同的时-空-频特性定义测量;针对大规模3D MIMO中信道空间相关性不平稳的特点,对评价指标在空间间隔上求期望;使用时域信道信息进行建模和识别.在此基础上,考虑到天线双极化的影响,改进评价指标,并提出算法TSFCI-2.仿真结果表明,TSFCI-1和TSFCI-2的算法性能均优于对比算法6%以上,错误率分别低至1.92%和1.72%.此外,讨论了信噪比和时域径数对表现最好的TSFCI-2性能的影响.

关键词: LOS/NLOS识别, 时间-空间-频率信道相关, 大规模三维多输入多输出, 信道估计

Abstract: To improve the performance of some wireless technologies, which are susceptible to line of sight (LOS) and non line of sight (NLOS), LOS/NLOS identification in 3D massive multi-input multi-output (MIMO) system is studied. Based on channel correlation, an improved identification algorithm, TSFCI-1, is proposed, which uses actual channel information instead of the normally assumed ideal accurate channel. The process includes:defining measurement based on time-space-frequency properties of LOS/NLOS; in view of the unsteady spatial channel correlation for 3D massive MIMO systems, finding the expectation of measurement on the spatial interval; using channel information to construct the statistical identification model. Considering the influence of antenna dual-polarization, TSFCI-2 with better evaluation index is proposed. It is shown that the identification error of TSFCI-1 and TSFCI-2 is as low as 1.92% and 1.72%, with over 6% better than a previous study. Besides, the effects of signal to noise ratio and the taps number on TSFCI-2 with the best performance is discussed.

Key words: line of sight/non line of sight identification, time-space-frequency channel correlation, 3D massive multiple-input multiple-output, channel estimation

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