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Simultaneous Excitation Systems for Ultrasonic Indoor Positioning
journal contribution
posted on 2020-01-01, 00:00 authored by Mohammad Omar Khyam, Md Noor-A- Rahim, Xinde Li, Aruna Jayasuriya, Apel MahmudApel Mahmud, Aman Maung Than OoAman Maung Than Oo, Shuzhi Sam GeThe ultrasonic technology is a tool for indoor positioning systems (IPSs) and has been extensively used in many applications. In ultrasonic IPSs (UIPSs), the use of a chirp signal (in which the frequency varies with time) is widespread due to its capability to obtain high-range resolution through its time-frequency characteristic. It also provides an opportunity to design effective waveform diversity which has always been the key to mitigating multiple-access interference (MAI) in multi-user UIPSs. To explore this, we analyze the chirp signal from the signal design perspective, with the goal of developing a precise and efficient UIPS for multi-user environments. To achieve this, three waveform diversity design schemes are proposed in which all the benefits of the classical chirp, such as high-range resolution, are retained while all the transmitters can transmit chirp signals simultaneously. In each scheme, a linear chirp is divided into two linear sub-chirps with diverse durations and/or bandwidths. This process is optimized by selecting the concatenated sub-chirps that generate a waveform which has a high-range resolution and relatively low interference in the same scheme. Initially, the effectiveness of the proposed schemes is evaluated for five simultaneous excitation signals using several metrics and experimental results are then presented for the ultrasonic indoor positioning.
History
Journal
IEEE Sensors JournalVolume
20Issue
22Pagination
13716 - 13725Publisher
IEEELocation
Piscataway, N.J.Publisher DOI
ISSN
1530-437XeISSN
1558-1748Language
engPublication classification
C1 Refereed article in a scholarly journalUsage metrics
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Categories
Keywords
Chirpmultiple-access interderenceultrasonic indoor positioningwaveform designScience & TechnologyTechnologyPhysical SciencesEngineering, Electrical & ElectronicInstruments & InstrumentationPhysics, AppliedEngineeringPhysicsAcousticsCorrelationBandwidthTime-frequency analysisOptical transmittersmultiple-access interferenceDEVICES