Estimation of propagation-path visibility for indoor wireless LAN systems under shadowing condition by human bodies

Millimeter-wave application systems such as indoor communication systems need direct connection between the base stations and terminals. Because human bodies may block the propagation-paths in the 60 GHz band in indoor environments, we have estimated the propagation-path visibility in office environments in which there is shadowing by human bodies. Although a lot of base stations or very tall terminals are needed to avoid shadowing by human bodies perfectly without base station diversity, diversity switching between only two base stations provides 98% propagation-path visibility.