Modeling of non-WSSUS double-Rayleigh fading channels for vehicular communications
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This paper deals with the modeling of nonstationary time-frequency (TF) dispersive multipath fading channels for vehicle-tovehicle (V2V) communication systems. As a main contribution, the paper presents a novel geometry-based statistical channel model that facilitates the analysis of the nonstationarities of V2V fading channels arising at a small-scale level due to the timevarying nature of the propagation delays. This new geometrical channel model has been formulated following the principles of plane wave propagation (PWP) and assuming that the transmitted signal reaches the receiver antenna through double interactions with multiple interfering objects (IOs) randomly located in the propagation area. As a consequence of such interactions, the first-order statistics of the channel model’s envelope are shown to follow a worse-than-Rayleigh distribution; specifically, they follow a double-Rayleigh distribution. General expressions are derived for the envelope and phase distributions, four-dimensional (4D) TF correlation function (TF-CF), and TF-dependent delay and Doppler profiles of the proposed channel model. Such expressions are valid regardless of the underlying geometry of the propagation area. Furthermore, a closed-form solution of the 4D TF-CF is presented for the particular case of the geometrical two-ring scatteringmodel.The obtained results provide new theoretical insights into the correlation and spectral properties of small-scale nonstationary V2V double-Rayleigh fading channels. © 2017 Carlos A. Gutiérrez et al.
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Communication channels (information theory); Fading channels; Geometry; Multipath fading; Osmium compounds; Receiving antennas; Signal receivers; Wave propagation; Closed form solutions; Correlation function; First-order statistics; Plane wave propagation; Rayleigh distributions; Spectral properties; Statistical channel model; Vehicular communications; Rayleigh fading
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