The Multipath Fading Channel Simulation for Indoor Positioning

Abstract

In recent years, with the increasing living standards, LBS (location-based service) has been gradually integrated into all aspects of daily life. However, compared to the outdoor environment, indoor environment is very complex. In this paper, we discuss the problem of TC-OFDM (time divided CDMA-OFDM superimposed signal system) multipath interference in the design of indoor positioning receiver based on the terrestrial broadcasting network. In the TC-OFDM system, because of the complexity of the indoor environment, the problem of multipath, especially the short-delay multipath, is particularly severe, which causes a serious impact on the receiver signal acquisition and tracking performance. Through theoretical analysis and mathematical simulation, we specify the characteristics of the fading channel in the indoor location and influence of the multipath signal. We also build the models of signals through the MATLAB software. Through the analysis in this paper, we can understand the propagation characteristics and the main error sources of the indoor signal better, furthermore, we provide theoretical basis for the system optimization in the future.

Foundation project: The National High Technology Research and Development Program (“863” Program) of China (No. 2015AA124101). The National Science Foundation of China (No. 61401040).