Delay and Doppler Spreads of Non-Stationary Vehicular Channels for Safety Relevant Scenarios

Laura Bernado, Thomas Zemen, Fredrik Tufvesson, Andreas Molisch, Christoph Mecklenbraäuker

Research output: Contribution to journalArticlepeer-review

119 Citations (SciVal)

Abstract

Abstract in Undetermined
Vehicular communication channels are characterized by a nonstationary time-frequency-selective fading process due to rapid changes in the environment. The nonstationary fading process can be characterized by assuming local stationarity for a region with finite extent in time and frequency. For this finite region, the wide-sense stationarity and uncorrelated scattering assumption approximately holds, and we are able to calculate a time-frequency-dependent local scattering function (LSF). In this paper, we estimate the LSF from a large set of measurements collected in the DRIVEWAY'09 measurement campaign, which focuses on scenarios for intelligent transportation systems (ITSs). We then obtain the time-frequency-varying power delay profile (PDP) and the time-frequency-varying Doppler power spectral density (DSD) from the LSF. Based on the PDP and the DSD, we analyze the time-frequency-varying root-mean-square (RMS) delay spread and the RMS Doppler spread. We show that the distribution of these channel parameters follows a bimodal Gaussian mixture distribution. High RMS delay spread values are observed in situations with rich scattering, whereas high RMS Doppler spreads are obtained in drive-by scenarios.
Original languageEnglish
Pages (from-to)82-93
JournalIEEE Transactions on Vehicular Technology
Volume63
Issue number1
DOIs
Publication statusPublished - 2014

Subject classification (UKÄ)

  • Electrical Engineering, Electronic Engineering, Information Engineering

Keywords

  • Channel characterization
  • RMS Doppler spread
  • RMS delay spread
  • channel measurements
  • non-WSSUS
  • vehicle-to-vehicle
  • vehicular communications

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