arXiv:2610.36792v1 Announce Type: new Abstract: This paper investigates static multipath suppression in a time-varying radio channel at 28 GHz using wideband measurements conducted in a dynamic road environment. Two temporal differencing filters and three Doppler-domain notch filtering configurations are compared in terms of their effects on power delay profiles (PDPs) and root mean square (RMS) delay spread. The results demonstrate that all investigated methods effectively suppress stationary multipath components, improving the visibility of vehicle-related reflections. However, differences in filter frequency responses influence the relative powers of dynamic multipath components and the resulting RMS delay spread distributions. The findings highlight the importance of static multipath suppression and filter selection in characterizing time-varying propagation channels.