From RSSI to CSI: Indoor Localization via Channel Response
From RSSI to CSI: Indoor Localization via Channel Response
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从 RSSI 到 CSI：通过信道响应进行室内定位
DOI：
10.1145/2543581.2543592
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发表时间：
2013-11-01
影响因子：
16.6
通讯作者：
Liu, Yunhao
中科院分区：
文献类型：
--
作者：
Yang, Zheng;Zhou, Zimu;Liu, Yunhao
室内无线定位中，无线发射信号的空间特征是进行位置识别和定位的基础。接收信号强度指示器（RSSI）在主流无线信号测量中可用，已被广泛应用于室内定位系统中。然而，由于多径衰落和时间动态性，它在复杂情况下的性能会急剧下降。突破性技术采用比RSSI更细粒度的无线信道测量。与RSSI不同，PHY层功率特征（信道响应）能够区分多径特性，并且因此具有准确和普遍的室内定位的收敛的潜力。信道状态信息（CSI，反映802.11 a/g/n中的信道响应）吸引了许多研究努力，并且一些先驱工作已经展示了亚米级甚至厘米级的精度。在这篇文章中，我们调查这一新的趋势，本地化的渠道响应。CSI和RSSI之间的差异突出了网络分层，时间分辨率，频率分辨率，稳定性和可访问性。此外，我们调查了大量最近的作品，并根据如何使用CSI将它们总体分为三类。对于每一个类别，我们强调的基本原则，并解决在这个新的和很大程度上开放的领域的研究的未来方向。
The spatial features of emitted wireless signals are the basis of location distinction and determination for wireless indoor localization. Available in mainstream wireless signal measurements, the Received Signal Strength Indicator (RSSI) has been adopted in vast indoor localization systems. However, it suffers from dramatic performance degradation in complex situations due to multipath fading and temporal dynamics.Break-through techniques resort to finer-grained wireless channel measurement than RSSI. Different from RSSI, the PHY layer power feature, channel response, is able to discriminate multipath characteristics, and thus holds the potential for the convergence of accurate and pervasive indoor localization. Channel State Information (CSI, reflecting channel response in 802.11 a/g/n) has attracted many research efforts and some pioneer works have demonstrated submeter or even centimeter-level accuracy. In this article, we survey this new trend of channel response in localization. The differences between CSI and RSSI are highlighted with respect to network layering, time resolution, frequency resolution, stability, and accessibility. Furthermore, we investigate a large body of recent works and classify them overall into three categories according to how to use CSI. For each category, we emphasize the basic principles and address future directions of research in this new and largely open area.