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Modified Gold Sequence for Positioning Enhancement in NB-IoT

Tian, Guoda LU ; Odetalla, Hatem ; Priyanto, Basuki E. ; Hu, Sha LU and Tufvesson, Fredrik LU (2019) 2019 IEEE Wireless Communications and Networking Conference, WCNC 2019 In IEEE Wireless Communications and Networking Conference, WCNC 2019-April.
Abstract

Positioning is an essential feature in Narrow-Band Internet-of-Things (NB-IoT) systems. Observed Time Difference of Arrival is one of the supported positioning techniques for NB-IoT. It utilizes the downlink NB positioning reference signal (NPRS) generated based on a length-31 Gold sequence. Although a Gold sequence has good auto-correlation and cross-correlation properties, the correlation properties of NPRS in NB-IoT are still sub-optimal. The reason is mainly due to two facts: the number of NPRS symbols in each subframe is limited, and the featured sampling-rate is low. In this paper, we propose to modify the NPRS generation by exploiting the cross-correlation function of the NPRS. That is, for each orthogonal frequency division... (More)

Positioning is an essential feature in Narrow-Band Internet-of-Things (NB-IoT) systems. Observed Time Difference of Arrival is one of the supported positioning techniques for NB-IoT. It utilizes the downlink NB positioning reference signal (NPRS) generated based on a length-31 Gold sequence. Although a Gold sequence has good auto-correlation and cross-correlation properties, the correlation properties of NPRS in NB-IoT are still sub-optimal. The reason is mainly due to two facts: the number of NPRS symbols in each subframe is limited, and the featured sampling-rate is low. In this paper, we propose to modify the NPRS generation by exploiting the cross-correlation function of the NPRS. That is, for each orthogonal frequency division multiplexing (OFDM) symbol we generate the first NPRS symbol as specified in the current standard, i.e., a Gold sequence; while the second OFDM symbol is set to the additive inverse of the first one. Our simulation results show that the proposed NPRS sequence results in improving the correlation properties, particularly with respect to the cross-correlation property. Furthermore, 15% -30% positioning-accuracy improvements can be attained with the proposed method, compared to the legacy one under both Additive White Gaussian Noise and Extended-Pedestrian-A channels. The proposed NPRS sequence can also be applied to other similar systems, such as long-term-evolution (LTE).

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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
2019 IEEE Wireless Communications and Networking Conference, WCNC 2019
series title
IEEE Wireless Communications and Networking Conference, WCNC
volume
2019-April
article number
8886076
publisher
Institute of Electrical and Electronics Engineers Inc.
conference name
2019 IEEE Wireless Communications and Networking Conference, WCNC 2019
conference location
Marrakesh, Morocco
conference dates
2019-04-15 - 2019-04-19
external identifiers
  • scopus:85074791493
ISSN
1525-3511
ISBN
9781538676462
DOI
10.1109/WCNC.2019.8886076
language
English
LU publication?
yes
id
84123a9f-fe32-47b2-ae3b-791037129436
date added to LUP
2019-12-02 14:04:22
date last changed
2020-01-13 02:33:43
@inproceedings{84123a9f-fe32-47b2-ae3b-791037129436,
  abstract     = {<p>Positioning is an essential feature in Narrow-Band Internet-of-Things (NB-IoT) systems. Observed Time Difference of Arrival is one of the supported positioning techniques for NB-IoT. It utilizes the downlink NB positioning reference signal (NPRS) generated based on a length-31 Gold sequence. Although a Gold sequence has good auto-correlation and cross-correlation properties, the correlation properties of NPRS in NB-IoT are still sub-optimal. The reason is mainly due to two facts: the number of NPRS symbols in each subframe is limited, and the featured sampling-rate is low. In this paper, we propose to modify the NPRS generation by exploiting the cross-correlation function of the NPRS. That is, for each orthogonal frequency division multiplexing (OFDM) symbol we generate the first NPRS symbol as specified in the current standard, i.e., a Gold sequence; while the second OFDM symbol is set to the additive inverse of the first one. Our simulation results show that the proposed NPRS sequence results in improving the correlation properties, particularly with respect to the cross-correlation property. Furthermore, 15% -30% positioning-accuracy improvements can be attained with the proposed method, compared to the legacy one under both Additive White Gaussian Noise and Extended-Pedestrian-A channels. The proposed NPRS sequence can also be applied to other similar systems, such as long-term-evolution (LTE).</p>},
  author       = {Tian, Guoda and Odetalla, Hatem and Priyanto, Basuki E. and Hu, Sha and Tufvesson, Fredrik},
  booktitle    = {2019 IEEE Wireless Communications and Networking Conference, WCNC 2019},
  isbn         = {9781538676462},
  issn         = {1525-3511},
  language     = {eng},
  month        = {04},
  publisher    = {Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Wireless Communications and Networking Conference, WCNC},
  title        = {Modified Gold Sequence for Positioning Enhancement in NB-IoT},
  url          = {http://dx.doi.org/10.1109/WCNC.2019.8886076},
  doi          = {10.1109/WCNC.2019.8886076},
  volume       = {2019-April},
  year         = {2019},
}