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BDS B1I multipath channel statistical model comparison between static and dynamic scenarios in dense urban canyon environment

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Satellite Navigation 2020年第1期1卷 287-302页

作者： Xin Chen Di He Ling Pei Shanghai Key Laboratory of Navigation and Location-based Service School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityDongchuan Road 800Shanghai 200240China

Global Navigation Satellite System(GNSS)multipath channel models are fundamental and critical for signal simulation and receiver performance evaluation.They also aid the designing of suitable multipath error mitigation algorithms when the properties of multipath channel are available.However,there is insufficient existing research on BeiDou Navigation Satellite System(BDS)signal multipath channel models.In this study,multipath channel statistical models are established on the basis of extensive datasets of the BDS B1I signal.A multipath parameter estimation algorithm is designed to extract information of multipath rays from the intermediate frequency data.The delay,power loss,Doppler fading frequency,and lifetime distribution models for static and dynamic vehicle platforms are established and compared,and the effects of the satellite orbit type and platform speed on the models are analyzed.The results reveal the detailed distribution and variation characteristics of the multipath parameters and are valuable for the development of accurate urban navigation systems.

关键词： multipath channel statistical model multipath delay multipath power loss multipath Doppler fading frequency multipath lifetime

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Blind estimation of multipath delays in OFDM systems

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Science China(Information Sciences) 2012年第6期55卷 1397-1401页

作者： SHENG Bin & YOU XiaoHu National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China National Mobile Communications Research Laboratory Southeast University Nanjing China

In order to coherently detect the transmitted data symbols,an orthogonal frequency division multi-plexing (OFDM) receiver requires reliable identification and equalization of the experienced wireless multipath fading channels.The information of path delays plays an important role in the procedure of identification and equalization.The need for high data rates motivated the search for blind identification and equalization methods because they save bandwidth by avoiding the use of training sequences.In OFDM systems,multipath fading channels introduce interference between adjacent symbols which can be prevented by inserting a cyclic prefix (CP) before each symbol.In this paper,we find that the power of the interference in the CP interval can be estimated by using the circular convolution and based on the variations of the interference power,the time delay of each path can be estimated blindly.

关键词： multipath delay cyclic prefix OFDM

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