In this contribution, a recently conducted measurement campaign for indoor millimeter-wave (mm-wave) propagation channels is introduced. A vector network analyzer (VNA)-based channel sounder was exploited to record the channel characteristics at the frequency band from 28-30 GHz. A virtual uniform circular array (UCA) with a radius of 0.25 m was formed using a rotator with 360 steps. Moreover, by taking advantage of fiber-optic technique applied in the channel sounder, measurements at 50 positions were performed from an indoor hall to an indoor corridor along a long pre-defined route. A low-complexity high-resolution propagation estimation (HRPE) algorithm is exploited to estimate the propagation parameters of multipath components (MPCs). Based on the HRPE estimation results, a novel clustering identification and tracking algorithm is proposed to trace clusters. Composite channel characteristics, cluster-level characteristics and dynamic (or birth-death) behaviours of the clusters are investigated, which constitute a dynamic model for the indoor mm-wave channel.

This paper presents a measurement-based analysis of 39 GHz millimeter wave (mm-wave) radio propagation through vegetation using an ultra-wideband (UWB) channel sounder. The measurement campaign was conducted in a suburban area on campus of Tongji University, Shanghai, China. Two different kinds of measurements were performed to investigate the foliage influence on the characteristics of radio propagation in the mm-wave bands. A direction-scan sounding (DSS) approach was used in the measurements aiming to explore the vegetation attenuation as well as dispersive characteristics of the propagation channel. Approximately 6.7 to 8.7 dB single-tree attenuation and 1.86 to 2.23 dB/m vegetation attenuation were observed at the so-called boresight aligned direction (BAD) of a transmitter (Tx) and a receiver (Rx). The presence of vegetation leads to dispersion in delay and angular domains. Both delay spread and azimuth of arrival spread were proportional to the number of trees existing between the Tx and the Rx. Measurements with the purpose of investigating the relationship between the foliage loss and Tx/Rx distances away from trees were also conducted.