Vehicle-To-Vehicle Channels: Are We Done Yet?

In this paper, we review the state of the field on measurements, models, and analysis for the vehicle-to-vehicle (V2V) channel. We first provide a survey of existing work on V2V models, including analytical and empirical models, and note main features and findings. Remaining work to be done in V2V modeling is then described, beginning with the logical next steps, then addressing less obvious areas of V2V channel research. We also provide some new results on statistically non-stationary models, specifically in terms of non-stationary Markov chains for modeling multipath component persistence. We show that in terms of delay dispersion measures, stationary 2^nd-order Markov models perform as well as non-stationary models. The paper concludes with a summary.