28 GHz mmWave Channel Measurements and Modeling in a Library Environment

TL;DR

This study conducts 28 GHz millimeter-wave channel measurements in a library environment, developing models for power angular-delay profiles and path loss, crucial for 5G indoor system design.

Contribution

It provides detailed measurement-based models for indoor mmWave channels in library settings, including LOS and NLOS scenarios with multi-floor considerations.

Findings

Path loss models fit empirical data well

LOS path loss exponent close to free space

Measurements cover distances from 10 m to 50 m

Abstract

To fully exploit the millimeter-wave bands for the fifth generation cellular systems, an accurate understanding of the channel propagation characteristics is required, and hence extensive measurement campaigns in different environments are needed. In this paper, we use a rotated directional antenna-based channel sounder for measurements at 28 GHz in large indoor environments at a library setting. We present models for power angular-delay profile and large-scale path loss based on the measurements over distances ranging from 10 m to 50 m. In total, nineteen different line-of-sight (LOS) and non-line-of-sight (NLOS) scenarios are considered, including the cases where the transmitter and the receiver are placed on different floors. Results show that the close-in free space reference distance and the floating intercept path loss models both perform well in fitting the empirical data. The path loss exponent obtained for the LOS scenarios is found to be very close to that of the free space path loss model.