In this paper, a ray-tracing technique taking into consideration the effects of user-body shadowing is investigated. With the rapid growth in the applicability of mobile devices, accurate received signal predictions are increasingly important. The user's body especially has a great impact on the received signals, because it is nearly always located close to the mobile device. We consider two deterministic shadowing models based on anechoic chamber measurements and an existing diffraction theory. The both models are established as the power loss on a single propagation path depending on the user's postures and relative positions. A combined method of the user-shadowing models and multipath channel profiles obtained by ray tracing is then introduced and the results are validated by a comparison with in-building measurements.