**6. Conclusion**

In the near future, more RT and SCM tools will be developed as the demand and applications of various wireless systems relying on these channel modeling tools constantly grow for the advancement of wireless communications. This chapter provided a case study for the evaluation of the SISO and MIMO channel capacity using the Two-Ray model for validation purpose, studies of the MIMO channel capacity evaluation using RT and SCM tools for indoor and outdoor environments, and a performance evaluation of RT and SCM tools for a V2X communication scenario. In spite of the assumptions made in the RT approach, especially for the V2X applications, there are only minor differences in the MIMO channel capacity between RT and SCM. The SCM is capable of characterizing stationary and nonstationary dynamic V2X communication systems operating at different velocities since it considers the temporal and spatial domains while the deterministic model is capable of representing realistic object geometries. However, in the RT approach, the vehicles' models can only be included at discrete positions and the simulations have to be performed at each location. RT tools, however, yield more accurate results for link-level simulations of static networks as it can model objects such as buildings, road obstacles, traffic signs, etc. and achieve channel information characterizing precise channel effects such as path loss, shadowing and multipath fading. While SCM tools also model these channel effects, its adaptation for temporal behavior and non-stationary channel models makes it more suitable for link- and system-level simulations analyzing data transmission and communications at the bit level.
