Measurement-based Wideband Radio Channel Characterization in an Underground Parking Lot

This paper reports the wideband radio channel measurement and characterization in an underground parking lot at frequency band from 4.9 GHz to 5.9 GHz. Single-input single-output and virtual single-input multiple-output channels are measured point-to-point by the Vector Network Analyzer based system. The measurements include both obstructed line-of-sight and non-line-of-sight scenarios, include influences of not only vehicles but also pillars which are commonly seen in underground parking. The radio channel modeling parameters, including path loss, delay spread, coherence bandwidth, power delay profile, reverberation time and power angular delay profile are summarized and analyzed. It is interesting to observe that due to the existence of objects like vehicles, pillars, and ceiling, the radio channels measured in underground parking presents rich spatial diversity even within a small area less than 50 m
²
.