The Multipath Fading Channel Simulation for Indoor Positioning
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 t
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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. Keywords Indoor location
Multipath interference Fading channel
Foundation project: The National High Technology Research and Development Program (“863” Program) of China (No. 2015AA124101). The National Science Foundation of China (No. 61401040). S. Yu (&) Z. Deng J. Jiao S. Jiang J. Mo F. Xu School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, China e-mail: [email protected] © Springer Science+Business Media Singapore 2016 J. Sun et al. (eds.), China Satellite Navigation Conference (CSNC) 2016 Proceedings: Volume II, Lecture Notes in Electrical Engineering 389, DOI 10.1007/978-981-10-0937-2_29
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1 Introduction The current mainstream positioning system includes American positioning system GPS, Compass China, European Galileo, Russia’s GLONASS, and other satellite positioning systems. Satellite positioning system can obtain precise positioning accuracy in the outdoor environment, but due to occlusion of the building, it has more limitation in application of the indoor environment. With the increasing development of social progress and people’s living standard, location-based services under the indoor environment have gained more and more attention. Research in related fields is becoming positioning technology research focus [1]. TC-OFDM (time divided CDMA-OFDM superimposed signal system) positioning system discussed herein is designed for the indoor complex environment, which can provide wide-area high-precision indoor location services. The current mainstream high-precision positioning systems use CDMA (Code Division Multiple Access) technology. So, TC-OFDM system is based on CDMA and the CDMA signal is superimposed on the mobile broadcast signals or mobile communication signal. Without affecting original system performance, TC-OFDM system provides users with high-accuracy locat
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