A multi-wall path loss model for UWB indoor propagation

The paper presents a propagation experiment performed in a modern office/laboratory building to investigate the UWB indoor channel behavior over the band 3.6 − 6 GHz. We accomplished measurements employing a correlative channel sounding technique. PN-sequence modulation is applied to a train of 0.4ns pulses and the pair of a direct sequence UWB transmitter and a correlation receiver is used. We collected data under extremely heterogeneous propagation conditions. LOS measurements are carried out along of the corridor and in office environment, while a total of 10×118 measurements are collected in NLOS scenarios, within office rooms, for a coverage range up to about 18 m. We describe the exploited measurement technique as well as the data processing approach. Finally, a multi-wall path loss model is recommended, instead of the classical single-slope model, to fairly evaluate the power decay with the link distance, separately taking into account the losses due to architectural obstacles intercepted by the direct paths of the propagating signals.