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利用信道状态信息的室内定位技术
李雨谦,吴韶波,姜冰,王明浩
0
(北京信息科技大学 信息与通信工程学院,北京 100101)
摘要:
多径效应导致基于信号接收强度(RSSI)的室内定位方法精度不高,采用更细粒度的物理层信道状态信息(CSI)可以区分不同路径,提高定位精度。在已有基于CSI室内定位方法的基础上,通过改进对数距离路径损耗模型,得到CSI与传输距离的关系,并结合目标位置所测得的CSI值回归出目标与发射端的距离,最后通过三边定位法预测出目标的位置坐标。实验表明,相比基于RSSI的定位方法以及已有的基于CSI的定位方法,所提方法2 m以内的误差概率提高了将近40%和20%,有效提高了定位精度。
关键词:  室内定位  信道状态信息  对数距离路径损耗模型  距离估计
DOI:
基金项目:国家自然科学基金资助项目(61603047)
Indoor positioning based on channel state information
LI Yuqian,WU Shaobo,JIANG Bing,WANG Minghao
(School of Information and Communication Engineering,Beijing Information Science and Technology University,Beijing 100101,China)
Abstract:
The indoor positioning method based on Received Signal Strength Indication(RSSI) is widely studied.However,due to the influence of multipath,the RSSI-based positioning has large error.In order to solve this problem,Channel Status Information(CSI) is applied in indoor positioning.The log-distance path loss model(L-DPLM) is improved to obtain the relationship between CSI and transmission distance,which can estimate the distance between the target and the transmitter .The position coordinates of the target are calculated by the three-sided positioning method.The experiment results show that the positioning accuracy is effectively improved by the proposed method compared with the RSSI method and the existing CSI method,and the error probability within 2 meters has increased by nearly 40% and 20%.
Key words:  indoor positioning  channel status information(CSI)  log-distance path loss model(L-DPLM)  distance estimation
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