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arXiv 2101.06186eess.SP
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COTS WiFi器件的基于卡尔曼滤波器的MIMO CSI相位恢复

Kalman filter based MIMO CSI phase recovery for COTS WiFi devices

Chu Li, Jeremy Brauer, Aydin Sezgin, Christian Zenger

摘要:

近来,来自商用多输入多输出(MIMO)WiFi系统的信道状态信息(CSI)测量已经普遍用于不同的无线感测应用。然而,由于硬件损伤,CSI实现的相位通常被相位误差严重失真,这显著降低了感测性能。在本文中,我们直接利用的硬件损伤所造成的相位失真的建模,并提出了一种自适应CSI估计方法的基础上,卡尔曼滤波器(KF)与最大后验概率(MAP)估计,认为CSI从以前的时间。所提出的算法的性能进行了比较,对Cramer Rao下界(CRLB)。仿真和实验结果表明,该方法可以跟踪信道的变化,同时消除相位误差准确。

英文摘要:

Recently channel state information (CSI) measurements from commercial multi input multi output (MIMO) WiFi systems have been ubiquitously used for different wireless sensing applications. However, the phase of the CSI realizations is usually distorted severely by phase errors due to the hardware impairments, which significantly reduce the sensing performance. In this paper, we directly utilize the modeling of the phase distortions caused by the hardware impairments and propose an adaptive CSI estimation approach based on Kalman filter (KF) with maximum a posteriori (MAP) estimation that considers the CSI from the previous time. The performance of the proposed algorithm is compared against the Cramer Rao lower bound (CRLB). Simulation and experimental results demonstrate that our approach can track the channel variations while eliminating the phase errors accurately.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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