Modelling of MIMO vehicle-to-vehicle fading channels in T-junction scattering environments

In this paper, a new wideband multiple-input multiple-output (MIMO) fading channel model for vehicle-to-vehicle (V2V) communications is proposed. The MIMO V2V channel model, called for brevity T-model, captures the propagation effects that occur if vehicles move towards a junction with a side road and corner buildings. The starting point for the derivation of the T-model is a new geometric T-junction scattering model, where both single- and double-bounce scattering mechanisms are assumed. Our geometry-based channel model takes into account the exact relationship between the angle-of-arrival (AOA) and the angle-of-departure (AOD). The statistical properties of the T-model are studied under the assumption of non-isotropic scattering. An analytical solution is provided for the space-time-frequency cross-correlation function (STF-CCF) from which several other important characteristic quantities like the temporal autocorrelation function (ACF) can directly be obtained. The achieved theoretical results are illustrated for a typical T-junction propagation scenario. This research work provides designers of MIMO V2V communication systems an important tool in form of a wideband spatial channel model enabling the performance analysis of new high data rate transmission schemes under propagation conditions occurring at T-junctions.