基于相邻子信道差分的CSI定位算法.doc

基于相邻子信道差分的CSI定位算法 基于相邻子信道差分的CSI定位算法 //.paper.edu.cn - 1 - 基于相邻子信道差分的 CSI定位算法 薛凯文，李朝晖，赵方** 作者简介：薛凯文（199#9900990-），男，硕士研究生，主要研究方向：移动计算与智能感知 通信联系人：李朝晖（1966-），女，副教授，主要研究方法：移动计算和多媒体技术 （北京邮电大学软件学院，北京 1#9900990#9900990876） 5 摘要：近年来，随着无线设备的逐渐普及，基于定位需求服务日益增长，室内定位技术成为 研究热点。其中基于WiFi网络室内定位技术由于具有部署便捷和低成本等优势成为室内定 位技术主流。然而现有的基于WiFi定位技术大多通过测量接收端的 RSSI（Received Signal Strength Indicator）生成指纹来完成定位，由于受 RSSI 信号时变性和多径效应影响，现有 WiFi定位技术存在较大误差。与此不同，论文使用新一代高速WiFi特有的可反映物理信道1#9900990 特征并具有多径区分能力的信道状态信息 CSI（Channel State Information），结合 MIMO （Multiple Input Multiple Output）天线技术，采用相邻子信道差提取定位特征值方法构建定 位指纹库，实现室内高精度定位。实验结果表明，使用 MIMO的基于信道差分的 CSI指纹 定位算法可获得 #9900990.98m的平均定位精度，明显优于使用 SISO（Single Input Single Output） CSI指纹定位算法性能。 15 关键词：室内定位；CSI；指纹匹配；MIMO 中图分类号：TP393 A CSI Indoor Localization Algorithm based on the Difference between Adjacent Sub-channels 2#9900990 XUE Kaiwen, LI Zhaohui, ZHAO Fang (College of Software Engineering, Being University of Posts and Telecommunications, Beijing 1#9900990#9900990876) Abstract: In recent years, with the growing popularity of the Wi-Fi devices，the need forlocation is growing,andindoor location technology has become a research hotpot. because of the convenient 25 and low cost, the indoor location technology which are based on widely deployed Wi-Fi network is very popular.By measuring the RSSI (Received Signal Strength Indicator) in receiver to generate fingerprints to complete positioning. However, In the process of measurement, under the influence of time-varying and multipath effect, the results of final positioning results has certain errors. In this paper, We use CSI(the Channel State Information) which reflects the characteristics 3#9900990 of the physical Channel to locate,Combining MIMO(Multiple Input Multiple Output) technology, Usingthe method which get the diff value between adjacent sub-channels to extract characteristic values and generate fingerprints, the result