A novel indoor ranging algorithm based on received signal strength and channel state information

With the increasing demand of location-based services, indoor ranging method based on Received Signal Strength Indicator (RSSI) or Channel State Information (CSI) has become an increasingly important technique due to its low hardware requirement and high accuracy. Due to robustness against the multipath effect, frequency domain Channel State Information (CSI) of Orthogonal Frequency Division Multiplexing (OFDM) systems is supposed to provide an excellent ranging measurement for indoor localization. In this paper, we propose a novel signal attenuation model for indoor ranging with RSSI and CSI. The proposed attenuation model scheme is implemented and validated with experiments in a typical indoor environment. Experimental results are presented to confirm that the proposed model can effectively reduce ranging error, compared with two existing methods in a typical indoor environment.