A wideband car-to-car channel model based on a geometrical semicircular tunnel scattering model

In this paper, we present a wideband single-input single-output (SISO) car-to-car (C2C) channel model based on a geometrical semicircular tunnel (SCT) scattering model. Starting from the geometrical scattering model, a reference channel model is derived under the assumption of single-bounce scattering in line-of-sight (LOS) and non-LOS (NLOS) propagation environments. In the proposed channel model, it is assumed that an infinite number of scatterers are uniformly distributed on the tunnel wall. Starting from the geometrical scattering model, the time-variant transfer function (TVTF) is derived and its correlation properties are studied. Expressions are presented for the two-dimensional (2D) time-frequency correlation function (TFCF), the temporal autocorrelation function (ACF), and the frequency correlation function (FCF). Owing to the semicircular geometry, we reduced the originally threefold integrals to double integrals in computations of the correlation functions, which are easy to solve numerically. From the TVTF characterizing the reference model, an efficient sum-of-cisoids (SOC) channel simulator is derived. Numerical results show that both the temporal ACF and the FCF of the SOC channel simulator match very well with those of the reference model.