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    Generic stochastic modeling of vehicle-to-vehicle wireless channels

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    Authors
    Karadimas, Petros
    Matolak, David
    Affiliation
    University of Bedfordshire
    University of South Carolina
    Issue Date
    2014-08
    Subjects
    fading channels
    stochastic channel modeling
    vehicle-to-vehicle (V–V) communications
    wide sense stationary uncorrelated scattering (WSSUS) channels
    
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    Abstract
    We present a generic statistical characterization of the vehicle-to-vehicle (V–V) wireless channel by adopting a stochastic modeling approach. Our approach is based on the doubly underspread (DU) property of non-wide sense stationary uncorrelated scattering (non-WSSUS) wireless channels, with V–V channels pertaining to this category. DU channels exhibit explicit frequency and time intervals over which they are approximated as WSSUS. We call these intervals restricted time interval (RTI) and restricted bandwidth (RBW), and variations taking place inside them are characterized as small scale variations. Large scale variations take place outside RTI and RBW. In this paper, we focus on small scale variations, thus, our modeling finds its applicability within RTI and RBW. As practical V–V channels exhibit rapid temporal fluctuations due to the inherent mobility of transmitter (Tx), receiver (Rx) and surrounding scatterers (e.g., other vehicles), we analyze the relevant second order statistics characterizing temporal variability, namely, the a) temporal correlation function (CF) (or autocorrelation function (ACF)), b) power spectral density (PSD) (or Doppler spectrum), c) level crossing rate (LCR) and d) average fade duration (AFD). Our analysis considers three-dimensional (3-D) scattering at the Tx and Rx together with random scatterers' mobility. Illustrative examples demonstrate the usefulness and flexibility of our analysis, which is further validated by fitting the theoretical LCR to an empirical, obtained at a US interstate highway. We show that significant Doppler frequencies can arise due to scatterers' mobility exceeding the respective maximum and minimum values when considering only Tx and Rx mobility. Also scatterers' mobility causes more rapid temporal variations when it becomes more intense. The latter is also true when 3-D scattering at the Tx and/or Rx spreads over a greater range of angular sectors and becomes less directional.
    Citation
    Karadimas, P., Matolak, D., (2014) "Generic stochastic modeling of vehicle-to-vehicle wireless channels" Vehicular Communications, 1 (4) pp. 153-167.
    Publisher
    Elsevier
    Journal
    Vehicular Communications
    URI
    http://hdl.handle.net/10547/336109
    DOI
    10.1016/j.vehcom.2014.08.001
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S2214209614000400
    Type
    Article
    Language
    en
    ISSN
    2214-2096
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.vehcom.2014.08.001
    Scopus Count
    Collections
    Centre for Wireless Research (CWR)

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