mmSplicer: Toward Experimental Multiband Channel Splicing at mmWave Frequencies

Joint communication and sensing (JCAS) and wireless sensing in general are gaining ever more attention in the research community. In general, wide-band sensing is required for high accuracy of the obtained distance measurements. However, wide-band sensing requires comparably expensive hardware (in terms of invest as well as energy consumption). As a solution, channel splicing has been developed for wide-band sensing using multiple narrow-band measurements. Despite many theoretical concepts, channel splicing at mmWave frequencies is still widely unexplored. In this paper, we present mmSplicer, which extends a splicing algorithm from the literature. We implemented mmSplicer in an SDR-based testbed for channel splicing at mmWave frequencies. First validation results show very high accuracy of the channel impulse response (CIR) in time domain.