NDLI: Design of new codes for reducing interference between GNSS-Like signals transmitted indoors

Content Provider	IEEE Xplore Digital Library
Author	Selmi, I. Vervisch-Picois, A. Samama, N.
Copyright Year	2013
Description	Author affiliation: Inst. Mines-Telecom, Telecom SudParis, Evry, France (Selmi, I.; Vervisch-Picois, A.; Samama, N.)
Abstract	In order to extend the GNSS coverage to indoor environments, several systems have been proposed for indoor positioning. Among them, those using local GNSS-like signal transmitters are of specific interest since they could allow a single device, the GNSS receiver, to achieve the continuity of the positioning service from outdoors to indoors. Since these local antennas broadcast GNSS signals similar to those broadcasted by the satellites, the indoor signals may interfere with the outdoor ones. Thus, it increases the noise level at the outdoor receiver's end and the error on the computed positions. In this paper, we propose new codes that aim to reduce this interference for both the GPS and the GLONASS signals (considering one could evenly consider the two constellations). Then the new proposed codes and modulations are described and the interference levels estimated in a simulated environment (typical of a museum or a conference centre). The basic underlying idea is that if the interference level is significantly decreased, then the maximum allowed transmitted power level (due to US and European regulations for instance) could potentially be increased. Then, the number or required transmitters could be decreased for the same coverage. The performance of the new proposed codes is tested in the case of the repealite based indoor positioning system, already described in the literature. In comparison with existing codes (PRN 33 to 36 for GPS Gold codes and specific m-sequence for GLONASS), the new so-called IMBOC codes (IMBOC stands for Indoor Modified Binary Offset Carrier) allow a reduction of the interference levels of typically 15dB outdoors. Spectrum considerations are also detailed, as it should be.
Sponsorship	IEEE
Starting Page	1
Ending Page	9
File Size	1810512
Page Count	9
File Format	PDF
ISBN	9781479940431
DOI	10.1109/IPIN.2013.6817850
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-10-28
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gold Correlation Frequency modulation M-sequences Repealites Interference Standards Global Positioning System Continuity of positioning Indoor positioning Gold codes Pseudolites New codes
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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