Multipath Parameter Extraction and Correction from Frequency Dependent Amplitude Fading

Abstract

Multipath interference can be a challenging problem in the determination of accurate outdoor and indoor localization. There are methods that exist to mitigate this problem by extracting the multipath parameters, namely, differential attenuation, carrier phase shift, and differential time-delay. One method is to transmit a narrow pulse and extract these parameters from the impulse response of the channel. Another well-established method is to use frequency dependent amplitude fading of a swept sinusoid for multipath parameters extraction. In this paper, we used the second technique for the suppression of multipath distortion. We implemented this scheme with an Ettus B120 software defined radio (SDR) and observed more than a factor of 8 (18 dB) reduction of multipath distortion under different indoor environments; our findings are supported by both simulation as well as experimental results.