Amplitude Distributions of Measured 21.5 GHz Indoor Channels for a Handheld Array

This work investigates 21.5 GHz channel amplitude distributions for a smartphone-like mockup device used in an indoor corridor environment. Channels between an access point (AP) and the mockup were measured for different scenarios and with different users holding the mockup. In addition the mockup was measured without any user nearby in the same conditions. This allows the study of amplitude cumulative distribution functions (CDFs) both when a user is present close to the antennas of the mockup, as well as when no interaction happens. Large variations in the CDF were found both for line of sight (LOS) and non-line of sight (NLOS) scenarios. The presence of a user generally reduced the 1st percentile of the fading amplitude by 2.9 dB and 4.9 dB in median, respectively, for vertical and horizontal polarization at the AP.