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This paper introduces the significance of indoor positioning and analyzes the related problems. The latest research on indoor positioning is introduced. Further, the positioning accuracy and the cost of typical local and wide area indoor positioning systems are compared. The results of the comparison show that Time & Code Division-Orthogonal Frequency Division Multiplexing (TC-OFDM) is a system...
Many terrestrial broadcasting systems, such as TC-OFDM and TDS-OFDM, use pseudo-random sequences in time domain to synchronize. This makes it possible for receivers to estimate the time differences of arrival (TDOA) with matched filters. However, the strong signals sent by the nearby base stations cause receivers difficult to receive the weak signals sent by base stations far away, which is known...
The base station positioning system is a complement and supplement to GNSS. Unlike GNSS, the parameters of channels between base stations and receivers are random, which causes problems in signal capturing. In this paper, a method of parallel residual carrier frequency searching (PRCFS) is introduced, which can capture the residual carrier frequency in random channel quickly and accurately.
In typical Urban environment, non-Line-Sight (NLOS) propagation between the base station (BS) and mobile station (MS) became the main factor of the positioning error. As a result, the study on the mitigation of its negative influence becomes a focus. Base on Chan algorithm, this paper presents a TDOA mobile location algorithm, which can improve the positioning accuracy effectively. The positioning...
Non-line-of-sight (NLOS) propagation biases Time of Arrival (TOA) and Time Difference of Arrival (TDOA). It causes the principal error for the mobile location in cellular networks. To mitigate the positioning error, a mobile positioning approach based on modified Kalman filter is proposed in this paper. With this approach, the true range is estimated based on the measurements, and the estimated range...
This paper introduces the principal of digital matched filters (DMFs), and based on Field Programmable Gate Array (FPGA), we make an analysis and optimization of DMFs which used in the quick acquisition of Pseudo-Noise (PN)-code for Global Position System (GPS). A structure as “Random Access Memory (RAM)-based shift register + folded” DMF is given in this paper. Compared with traditional folded DMF,...
In TDOA cellular mobile location, Non-Line-of-Sight (NLOS) propagation of radio waves brings about the larger errors of TOA/TDOA parameter measurements, thus resulting in location accuracy decreasing seriously. On the basis of TDOA errors analysis and NLOS characteristics investigation, a NLOS mitigation algorithm is proposed in this paper to realize the TDOA smoothing and LOS reconstruction by Kaiman...
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