Vehicle-to-Vehicle Millimeter-Wave Channel Characterization at 60 and 80 GHz

This paper presents results from a vehicle-to-vehicle channel measurement campaign conducted in the millimeter-wave (MMW) frequency bands at center frequencies of 60 GHz and 80 GHz, each with a bandwidth of 2 GHz. The measurements were performed in a dynamic oncoming-vehicle scenario using a time-domain channel sounder with high-resolution data acquisition. Power delay profiles were extracted to study the temporal evolution of multipath components, and the root mean square (RMS) delay spread was analyzed to characterize the temporal dispersion of the channel. The results demonstrate differences between the two frequency bands. At 60 GHz, the RMS delay spread is well approximated by a Gaussian distribution with a higher median value, while at 80 GHz it follows a lognormal distribution with a lower median. Furthermore, the number of resolvable multipath components was found to be nearly twice as high at 60GHz compared to 80 GHz, highlighting the impact of antenna beamwidth and frequency-dependent propagation mechanisms.