標題: Three-Dimensional Positioning for LTE Systems
作者: Chen, Chih-Yu
Wu, Wen-Rong
電機工程學系
Department of Electrical and Computer Engineering
關鍵字: Angle of departure estimation;channel estimation;positioning systems;transmit beamforming
公開日期: 1-四月-2017
摘要: In the Third-Generation Partnership Project (3GPP) Long-Term Evolution (LTE) specifications, several 2-D positioning methods have been proposed to support location-based services (LBSs). It has been shown that the observed time difference of arrival (OTDOA) method provides the best result. With the advent of the fifth-generation cellular systems, 3-D beamforming will be introduced, and 2-D positioning may not be sufficient for future applications. Although the conventional OTDOA method can be used in 3-D positioning, it requires more base stations (BSs) in cooperation and often performs poorly in typical cellular network geometry. In this paper, we propose a novel OTDOA-based method to solve the problems. First, we exploit the sparsity of the wireless channel and propose to use a compressive-sampling-based channel estimation method, which greatly enhances the precision of time-of-arrival (TOA) estimation. Then, we propose a transmit beamforming scheme such that the elevation angle of departure (AOD) can be accurately estimated. Finally, we combine the estimated TOAs and the AOD in the OTDOA scheme to conduct 3-D positioning. With the proposed scheme, the number of BSs required for 3-D positioning remains the same as that of 2-D, and the positioning accuracy greatly outperforms that of the conventional OTDOA method. Simulations show that 90% of the position error can be less than 7 m.
URI: http://dx.doi.org/10.1109/TVT.2016.2593697
http://hdl.handle.net/11536/145405
ISSN: 0018-9545
DOI: 10.1109/TVT.2016.2593697
期刊: IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Volume: 66
起始頁: 3220
結束頁: 3234
顯示於類別:期刊論文