Device-Free Indoor Location Estimation System Using Commodity Wireless LANs

In recent years, propagation channel characteristics have been effectively used in several applications such as motion sensing and position detection. Considerable attention has paid to channel-sounding methods that are easy utilize using low-cost devices. This paper presents a device-free indoor location estimation method the spatio-temporal features of radio channels 2.4 GHz-band three-by-three multiple-input-multiple-output (MIMO) sounder developed commodity wireless local area network (WLAN). The measurement results demonstrated reasonable performance proposed with small number antennas.