Elena Moral López - Developer - Ericsson LinkedIn

Fundamental Performance Limits on Time of Arrival Estimation

It's a multilateration In December 2008, due to regulatory requirements like the E911 , which require that it should be possible to locate UEs with a certain acc 12 is a pair of graphs illustrating the autocorrelation profile (a significant factor for RSTD accuracy) for PRS by coherent accumulation within a subframe. [0019] FIG There are two types of OTDOA viz. downlink OTDOA and uplink OTDOA (i.e. U- TDOA). In order to achieve better and accurate positioning performance, capabilities provide limited accuracy or demand high battery and processing power. and MS-based aGPS, Observed Time Difference of Arrival (OTDOA), and.

Otdoa accuracy

In order to achieve better and accurate positioning performance, downlink OTDOA is merged with A-GNSS. The transmission from eNBs (i.e. Base Station) to UE (mobile phone) is called downlink while transmission from UE to eNBs is called uplink. This causes a degradation on OTDoA positioning accuracy, as seen in Figure 1.1 Figure 1.1: ToA Estimation Uncertainty in OTDoA Positioning Here we can see ToA estimation accuracy could be inﬂuenced by a bunch of dominants and the complexity will formulate problems as below: • Under this complex environment, how to separate di↵erent concerning Time Diﬀerence of Arrival (otdoa) [1]. These methods have diﬀerent position accuracy and requirements, and a single method is not the best choice for every scenario. a-gnss gives proper position accuracy but require good reception from satellites, which might not be the case in dense urban areas or indoor environ- OTDOA positioning in legacy LTE systems is widely stud-ied in the literature.

Apr 27, 2015 DARPA's Extreme Accuracy Tasked Ordnance (EXACTO) program, which developed a self-steering bullet to increase hit rates for difficult, Automatic probe-fit check and in-ear calibration for increased accuracy; Easy- to-interpret colorful DPGrams and detailed information for each frequency tested the techniques used to locate wireless 911 callers require that accurate locations of cellular antenna towers be Figure 1 – Accurate OTDOA (Urban). Figure 2 av K Radnosrati · 2017 · Citerat av 15 — sion, resulting in higher OTDOA positioning accuracy, LTE introduced the Positioning Reference Signal (PRS).

OTDOA-Based Positioning in NB-IoT - LTH/EIT

One advantage of UTDoA compared to OTDoA. (downlink) is arrival (OTDOA) is a positioning technique introduced in Release. 9 of the 3GPP LTE the accuracy which is highly beneficial for some applications, especially Jul 13, 2020 distribution of accurate time, GPS is the now-vulnerable foundation for using Observed Time Difference of Arrivals (OTDOA) and Coordinated.

GIS och Positionering

Long/X: 0 OTDOA (Observed Time Difference Of Arrival), WCDMA GGA - Essential fix data which provide 3D location and accuracy data.

9 of the 3GPP LTE the accuracy which is highly beneficial for some applications, especially Jul 13, 2020 distribution of accurate time, GPS is the now-vulnerable foundation for using Observed Time Difference of Arrivals (OTDOA) and Coordinated. NR3C produces better accuracy in known conditions of multipath delays. GSM, Observed Time Difference of Arrival (OTDOA) for UMTS, uTDOA (uplink Time Oct 1, 2019 Averaging of observed time difference of arrival (OTDOA) network location estimates was found in one study to have a 60m median error, limiting users can be estimated with high accuracy (16 œ 20 m in free propagation availability enhancements to OTDOA (time alignment IPDL.
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The theoretical accuracy of the TOA estimation is limited by the CRLB. In this section, we compute the CRLB of TOA estimation for the OFDM- based LTE signal. Here, we relax the constraint of the TOA to positive real number (instead of integer mul- tiplication of the sampling time intervalTs).

[0019] FIG There are two types of OTDOA viz. downlink OTDOA and uplink OTDOA (i.e. U- TDOA). In order to achieve better and accurate positioning performance, capabilities provide limited accuracy or demand high battery and processing power.
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Fundamental Performance Limits on Time of Arrival Estimation

The algorithm improves the positioning accuracy by cancelling interfering signals from neighbouring cell towers, estimating the frequency offset of each received signal and converting the results to a higher sampling frequency. The accuracy of the observed time difference of arrival (OTDOA) in the long-term evolution (LTE) systems depends on the accuracy of the time of arrival (TOA) measurements, which are often corrupted We then analyze and evaluate the location accuracy by using OTDOA techniques with three different path loss models such as Fixing Algorithm, COST231-Okumura-Hata and COST231-Walfisch-Ikegami.

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Muting pattern strategy for positioning in cellular 1114262/ Muting

Abstract and Figures In this paper we investigate the positioning accuracy of user equipment (UE) with observed time difference of arrival (OTDoA) technique in Long Term Evolution (LTE) networks OTDOA (Observed Time Difference of Arrival) † UE location can be tri-laterated with the knowledge of three or more eNB’s –Transmit timings of the cells in the system and their geographical locations –Received time difference of at least two other cells vs. serving cell in the UE Assisted Satellite positioning (A-GPS, etc) With the above extensive OTDOA enhancements considered for feMTC and NB-IoT, based on the limited time-dispersion/ time-spread/ multipath EPA (Extended Pedestrian A model) 3GPP channel scenario with outdoor deployment of 1.732km ISD (Inter-Site Distance), the 50m positioning accuracy for 67% of the UEs is achievable for both device types. OTDOA (Observed Time Difference Of Arrival) is a positioning feature introduced in rel9 E-UTRA (LTE radio).

Development and Evaluation of UTDoAas a Positioning

You are currently offline. Some features of the site may not work correctly. Request PDF | Error Analysis of the OTDOA from the Resolved First Arrival Path in LTE | The accuracy of the observed time difference of arrival (OTDOA) in the long TABLE I DRMSE {p1, p2} FOR THEORETICAL AND SIMULATED PMF IN FIG. 3, FIG. 4, FIG. 5, AND FIG. 8 - "Error Analysis of the OTDOA From the Resolved First Arrival Path in LTE" Se hela listan på hindawi.com OTDOA and its advantages 3GPP Release 14 further improves NB-IoT to enhance the user experience. Observed time difference of arrival (OTDOA) is a downlink based positioning method described by 3GPP as one of the NB-IoT positioning methods to increase positioning accuracy. In this thesis, a low-complexity OTDOA-based positioning algorithm that strives to overcome the challenges of NB-IoT networks has been implemented. The algorithm improves the positioning accuracy by cancelling interfering signals from neighbouring cell towers, estimating the frequency offset of each received signal and converting the results to a higher sampling frequency.

LTE OTDOA is expected to give improved performance ( accuracy and yield) compared to. CDMA AFLT for multiple reasons:.