Doppler Shift Characterization of Wideband Mobile Radio Channels Article

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Overview

abstract

• The prevailing approach for characterizing the Doppler shift (DS) of mobile radio channels assumes the transmission of an unmodulated carrier. This consideration is valid for the analysis of narrowband channels, but its pertinence is questionable in regards to the modeling of wideband channels. In this correspondence, we redefine the DS from a time-frequency analysis perspective that does not depend on the aforementioned assumption. We systematically demonstrate that the DS can be characterized by the instantaneous frequency of the channel transfer function. This generic definition makes evident a fundamental aspect of the DS that is seldom acknowledged, namely, the DS is a frequency-varying quantity. We show that the second-order statistics of wideband mobile radio channels are non-stationary due to the DS%27s frequency variations. In addition, we present numerical results of a case study showing that such non-stationarities can cause significant system performance degradations. © 1967-2012 IEEE.
• The prevailing approach for characterizing the Doppler shift (DS) of mobile radio channels assumes the transmission of an unmodulated carrier. This consideration is valid for the analysis of narrowband channels, but its pertinence is questionable in regards to the modeling of wideband channels. In this correspondence, we redefine the DS from a time-frequency analysis perspective that does not depend on the aforementioned assumption. We systematically demonstrate that the DS can be characterized by the instantaneous frequency of the channel transfer function. This generic definition makes evident a fundamental aspect of the DS that is seldom acknowledged, namely, the DS is a frequency-varying quantity. We show that the second-order statistics of wideband mobile radio channels are non-stationary due to the DS's frequency variations. In addition, we present numerical results of a case study showing that such non-stationarities can cause significant system performance degradations. © 1967-2012 IEEE.

authors

• Azurdia-Meza C.A.
• Gutiérrez C.A.
• MacIel Barboza F.M.
• Ortega N.M.
• Patzold M.

publication date

• 2019-01-01

funding provided via

• 11160517  Grant
• ELAC2015/T10-0761  Grant
• UCOL-PTC-267 2018–2019  Grant

published in

• IEEE Transactions on Vehicular Technology  Journal

Research

keywords

• Doppler shift; instantaneous frequency; non-stationary channels; propagation delay; radio communications Doppler effect; Radio communication; Channel transfer functions; Doppler shift characterization; Instantaneous frequency; Non-stationary channels; Propagation delays; Second order statistics; System performance degradation; Time frequency analysis; Radio transmission

Identity

Digital Object Identifier (DOI)

• 10.1109/TVT.2019.2945936

Additional Document Info

start page

• 12375

end page

• 12380

volume

• 68

issue

• 12