SOURCE LOCATION ESTIMATION USING PHASELESS MEASUREMENTS WITH THE MODULATED SCATTERING TECHNIQUE FOR INDOOR WIRELESS ENVIRONMENTS

Abstract

This paper proposes the source location estimation technique with the modulated scattering technique (MST) for indoor wireless environments. The uniform circular scatterer array (UCSA) that consist of flve optically modulated scatterers as array elements and a dipole antenna at the center of the UCSA is employed for estimating a source location from the impinging signal. In contrast with a conventional uniform circular array (UCA), the proposed method using the MST needs only one RF path. Also, the plane-wave assumption of the impinging signal is not necessary for an array signal processing because the proposed method is based on a phaseless measurement. Therefore, the proposed method can be applied in short-range LOS and NLOS environments that the plane-wave signal cannot be formed. A source location is estimated by using a simple estimation algorithm based on the power difierence of the scattering signals modulated by two scatterers on the UCSA. The power difierence is caused by difierent propagation loss between a source and each scatterer. The performance of the proposed method is demonstrated by measuring the angles of the incoming signals in the anechoic chamber and by comparing the estimated angles with the simulated results.