Dual-Band MmWave Measurements of Human Body Scattering and Blockage Effects Using Distributed Beamforming for ISAC Applications

Millimeter-wave (mmWave) systems are designed for shorter transmission distances and with directive beams. Their performance is easily harmed by the presence of human blockers. Although the impact of a single human body blocking direct path between mmWave transmitter and receiver has been investigated in literature, the effect of multiple humans, as not only blockers but also reflectors/scatterers, is lacking. It is also crucial to study human scattering and blockage effects altogether in distributed multi-input multi-output (MIMO) setups exploiting mono-/bi-/multi-static links. We present our distributed multi-static double-directional measurements using a 24/60 GHz dual-band channel sounder with commercial phased arrays. We've performed novel quasi-static measurements with the presence of up to 3 persons standing at diverse locations with various facing directions. The measurement setup also incorporated four distributed depth-cameras to capture ground truth positions/geometry of the humans. The angular-delay domain power spectra of the distributed links at the concurrent dual bands are visualized and insights are given.