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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 a pair of direct sequence UWB transmitter and a correlation receiver is used. We collected data under extremely heterogeneous propagation conditions. LOS measurements are carried out along the corridor and in the office environment, while a total of 10 /spl times/ 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 …