School of Computer Science and Technology, China University of Mining and Technology, Xuzhou 221116, China.
Sensors (Basel). 2018 Jun 4;18(6):1818. doi: 10.3390/s18061818.
Most of the indoor localization systems nowadays are based on received signal strength indication (RSSI), which has further increased the importance of precise localization of access points (AP) in a wireless local area network (WLAN). Since most existing AP localization algorithms suffer from a high error rate in practical scenarios due to multipath fading and temporal dynamics, we propose an AP localization algorithm based on the channel status information (CSI) sequence-based localization (SBL-CSI). The proposed algorithm SBL-CSI is an efficient localization method that consists of the following three major steps: Firstly, a 2D localization space is divided by special APs into distinct regions, and each region has a unique location sequence that represents the distance ranks of special APs to that region and constructs the location sequence table. Then, the relative distance of the ordinary AP, served in the location sequence, is obtained by using CSI between the ordinary AP and special AP. Finally, the "nearest" feasible sequence of the ordinary AP in the location sequence table is searched, and the centroid of the corresponding region is the ordinary AP's localization. Compared with the traditional localization algorithm based on RSSI, the experiment results demonstrate that the positioning accuracy is improved approximately 24.31%.
目前，大多数室内定位系统都基于接收信号强度指示 (RSSI)，这进一步增加了无线局域网 (WLAN) 中接入点 (AP) 精确定位的重要性。由于大多数现有的 AP 定位算法由于多径衰落和时间动态性而在实际场景中存在高误差率，因此我们提出了一种基于信道状态信息 (CSI) 序列的 AP 定位算法 (SBL-CSI)。所提出的 SBL-CSI 算法是一种有效的定位方法，它由以下三个主要步骤组成：首先，通过特殊的 AP 将 2D 定位空间划分为不同的区域，每个区域都有一个唯一的位置序列，表示特殊 AP 到该区域的距离等级，并构建位置序列表。然后，通过普通 AP 和特殊 AP 之间的 CSI 获得普通 AP 的相对距离。最后，在位置序列表中搜索普通 AP 的“最近”可行序列，相应区域的质心就是普通 AP 的定位。与传统的基于 RSSI 的定位算法相比，实验结果表明定位精度提高了约 24.31%。
