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dc.contributor.authorHicheri, Rym
dc.contributor.authorAbdelgawwad, Ahmed
dc.contributor.authorPätzold, Matthias Uwe
dc.identifier.citationHicheri, R. Abdelgawwad, A. Pätzold, M. U. (2021). A non-stationary relay-based 3D MIMO channel model with time-variant path gains for human activity recognition in indoor environments. Annales des télécommunications, 76, 827-837.en_US
dc.description.abstractExtensive research showed that the physiological response of human tissue to exposure to low-frequency electromagnetic fields is the induction of an electric current in the body segments. As a result, each segment of the human body behaves as a relay, which retransmits the radio-frequency (RF) signal. To investigate the impact of this phenomenon on the Doppler characteristics of the received RF signal, we introduce a new three-dimensional (3D) non-stationary channel model to describe the propagation phenomenon taking place in an indoor environment. Here, the indoor space is equipped with a multiple-input multiple-output (MIMO) system. A single person is moving in the indoor space and is modelled by a cluster of synchronized moving point scatterers, which behave as relays. We derive the time-variant (TV) channel transfer function (CTF) with TV path gains and TV path delays. The expression of the TV path gains is obtained from the instantaneous total received power at the receiver side. This TV total received power is expressed as the product of the TV power of the RF signal initially transmitted and received by a body segment and the TV received power of the redirected signal. These TV powers are determined according the free-space path-loss model. Also, a closed-form approximate solution to the spectrogram of the TVCTF is derived. Here, we analyse the effect of the motion of the person and the validity of the relay assumption on the spectrogram, the TV mean Doppler shift (MDS), and the TV Doppler shift (DS) of the TVCTF. Simulation results are presented to illustrate the proposed channel model.en_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titleA non-stationary relay-based 3D MIMO channel model with time-variant path gains for human activity recognition in indoor environmentsen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.rights.holder2021 The Author(s)en_US
dc.subject.nsiVDP::Matematikk og Naturvitenskap: 400::Informasjons- og kommunikasjonsvitenskap: 420en_US
dc.source.journalAnnales des télécommunicationsen_US
dc.relation.projectNorges forskningsråd: 261895en_US
dc.relation.projectNorges forskningsråd: 300638en_US

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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal