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

TL;DR

This study characterizes vehicle-to-vehicle millimeter-wave channels at 60 and 80 GHz, revealing differences in delay spread and multipath components crucial for designing future vehicular communication systems.

Contribution

It provides the first detailed measurement-based comparison of V2V MMW channel characteristics at 60 and 80 GHz frequencies.

Findings

Higher RMS delay spread at 60GHz with Gaussian distribution.

Fewer resolvable multipath components at 80GHz.

Significant frequency-dependent propagation differences observed.

Abstract

This paper presents results from a vehicle-to-vehicle channel measurement campaign conducted in the millimeter-wave (MMW) frequency bands at center frequencies of 60GHz and 80GHz, each with a bandwidth of 2GHz. 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 60GHz, the RMS delay spread is well approximated by a Gaussian distribution with a higher median value, while at 80GHz 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 60\,GHz compared to 80GHz, highlighting the impact of antenna beamwidth and frequency-dependent propagation mechanisms.