28-GHz indoor channel measurements and analysis of propagation characteristics

In this paper, we present an indoor channel measurement system at 28 GHz and analysis result of propagation characteristics. The measurement system consists of a vector network analyzer (VNA) and a pair of 26 dBi horn antennas. It makes reliable wireless links with a maximum distance up to 30 meters. Measurement campaign was conducted in Beijing with three different indoor scenarios including office, corridor and hall. Power delay profiles (PDPs) are derived from raw data measured in four transmitter locations and 101 receiver locations. On this basis, three types of propagation characteristics including path loss, root mean square (RMS) delay spread and power angular profiles (PAPs) are analyzed. The results show that indoor environments can enhance received signal power in LOS case. However, in NLOS condition penetration loss caused by wall and door may bring considerable attenuation, which implies that smaller cells will play an important role on increasing the probabilities of LOS links for the future communication systems. Multipath components (MPCs) can be detected in several directions although using high-directional antennas.