%0 Journal Article
%T 基于信道状态信息的WiFi环境感知技术<br>CSI-based WiFi environment sensing
%A 朱海
%A 肖甫
%A 孙力娟
%A 谢晓辉
%A 王汝传
%J 南京邮电大学学报（自然科学版）
%D 2016
%X 随着WiFi技术的日益成熟和广泛部署，在使用WiFi信号实现基础通信功能的同时，研究者开始将WiFi技术应用于环境感知。传统基于WiFi的环境感知通常基于接收信号强度RSS信息，然而其性能受限于多径效应等因素影响。近年来，随着信道状态信息CSI可基于普通商用设备获得，研究者开始研究基于CSI的环境感知技术，并进行了一系列开创性工作。相比于RSS，CSI更细粒度地描述了无线信道状态，并可较好地区分多径成分，从而实现更为鲁棒、可靠的环境感知。文中主要对基于CSI的环境感知新趋势进行了综述分析，在深入分析现有工作的基础上，根据CSI的使用方式将这些工作分为人体检测、室内定位、视距路径识别和活动识别等4类。针对每类应用，文中详细介绍了其基本工作原理及代表性原型系统，最后指出了基于CSI的环境感知技术的未来潜在发展方向。<br>With the increasingly mature and widespread deployment of WiFi,researchers have been seeking to reuse WiFi signals for environment sensing beyond a basic communication service.Although received signal strength (RSS) has been adopted in traditional WiFi environment sensing,it suffers from dramatic performance degradation in indoor environment because of multipath effect.In recent years,with the availability of channel state information (CSI) in common commercial devices,CSI-based environment sensing is studied and some pioneer works are proposed.Compared with RSS,CSI is a finer grained descriptor of the wireless channel,which can discriminate multipath components,thus holding the potential for more robust and reliable environment sensing.This paper summerizes the new trend of CSI-based environment sensing.Based on the in-depth analysis of existing works,four categories are classified according to how to use CSI:human detection,indoor localization,line-of-sight identification,and activity recognition.For each category,the basic principles and representative prototype systems are introduced.Finally future directions of CSI-based environment sensing are pointed out
%K 接收信号强度 信道状态信息 WiFi 无源感知&lt
%K br&gt
%K received signal strength (RSS) channel state information (CSI) WiFi sensorless sensing
%U http://nyzr.njupt.edu.cn/ch/reader/view_abstract.aspx?file_no=201601015&flag=1