Directional Delay Spread and Interference Quotient Analysis in sub-7GHz Wi-Fi bands
Directional Delay Spread and Interference Quotient Analysis in sub-7GHz Wi-Fi bands
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7GHz 以下 Wi-Fi 频段的定向延迟扩展和干扰商分析
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
A. Molisch
中科院分区：
文献类型：
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作者：
Jorge Gómez;Daoud Burghal;Naveed A. Abbasi;Arjun Hariharan;Gopal Jakhetia;Praveen Chaganlal;A. Molisch
延迟色散是影响系统设计和性能的关键传播信道特性之一。特别地，对于诸如Wi-Fi的基于OFDM的系统，其确定可用频率分集的量和最小所需循环前缀两者，这进而影响频谱效率。为此，延迟扩展和功率延迟分布已经分析了很长时间。然而，最近Wi-Fi的升级，特别是增加了新的频率范围（6-7.1 GHz），以及引入了自适应波束成形，需要基于新的测量结果进行重新评估。本文提出了广泛的测量结果的RMS延迟扩展和干扰商，考虑到这些发展。在2.4-2.5、5-6和6-7 GHz频段测量结果。此外，我们比较了“全向”延迟扩展和干扰商（即，当在发射机和接收机处用全向天线测量时）到当使用波束成形天线时发生的那些。我们发现，对于室外和室内环境，波束成形通常将干扰商（对于给定的窗口大小）提高约3-5 dB。2.4和5-7 GHz频段显示出显著差异，而我们无法观察到5-6和6-7 GHz频段之间的统计学显著差异。
Delay dispersion is one of the key propagation channel characteristics that impact system design and performance. In particular, for OFDM-based systems such as Wi-Fi, it determines both the amount of available frequency diversity and the minimum required cyclic prefix, which in turn impacts the spectral efficiency. For this reason, delay spread and power delay profiles have been analyzed for a long time. However, recent upgrades in Wi-Fi, in particular the addition of a new frequency range (6-7.1 GHz), and the introduction of adaptive beamforming, require a re-assessment based on new measurements. This paper presents extensive measurement results of RMS delay spread and interference quotient that take these developments into account. Results were measured in the 2.4-2.5, 5-6, and 6-7 GHz bands. Furthermore, we compare the “omni-directional” delay spread and interference quotient (i.e., when measured with omni-antennas at transmitter and receiver), to those that occur when beamformed antennas are used. We found that for both outdoor and indoor environments, beamforming typically improves the interference quotient (for a given window size) by about 3-5 dB. The 2.4 and 5-7 GHz bands show a significant difference, while we could not observe statistically significant differences between the 5-6 and 6-7 GHz bands.