Measurement-Based Characterization of 39 GHz Millimeter-Wave Dual-Polarized Channel Under Foliage Loss Impact

Yejian Lv,Chao Zhang,Xuefeng Yin,Haowen Wang

doi:10.1109/access.2019.2945042

Abstract

This paper presents a measurement-based analysis of wideband 39 GHz millimeter wave (mm-wave) dual-polarized propagation channel under the impact of foliage presence between a transmitter (Tx) and a receiver (Rx). The measurements were conducted in a rich-vegetation area, and the so-called direction-scan-sounding (DSS) method which rotates a horn antenna in angular domains was applied, aiming at investigating the direction-of-arrival (DoA)-dependent characteristics of polarimetric channels. Four Tx-to-Rx polarization configurations were considered, including co-polarization scenarios with vertical Tx-polarization to vertical Rx-polarization (VV) and horizontal to horizontal (HH), as well as cross-polarization with vertical to horizontal (VH) and horizontal to vertical (HV), which allow scrutinizing the differences in delay-direction dispersion for usually-encountered scenarios. A foliage loss model for various vegetation depths in VV polarization configuration, was also presented in this paper. The results show that the foliage-loss DoA spectra for VH and HV are similar, while the spectra exhibit less penetration loss in most directions for VV than for the HH. Furthermore, the presence of vegetation between the Tx and the Rx leads to larger dispersion in delay compared to the clear line-of-sight (LoS) scenario, particularly for vertical polarization in the Tx side, and additionally, the foliage presence also results in evident DoA dispersion, specially in the HV scenario. Selectivity in directions caused by foliage is more significant in vertically-polarized Tx scenarios than in the horizontally-polarized Tx scenarios. A statistical model is established summarizing these comparison details.

Highlights

With the exponentially increasing interests on the fifthgeneration (5G) communication, the characteristics of millimeter-wave propagation channel drew tremendous attention world-widely
PARAMETER DEFINITIONS In this paper, we focus on characterising the polarimetric channel from four aspects, i.e., foliage loss, delay spread, angular spread, and direction-dependent XPD spectra
EXPERIMENTAL RESULTS polarimetric channel characteristics in the foliage NLoS scenario are analyzed from the perspectives of calculated the parameters, including the foliage loss, delay spread, angular spread and direction dependent XPD characteristics

Summary

INTRODUCTION

With the exponentially increasing interests on the fifthgeneration (5G) communication, the characteristics of millimeter-wave (mm-wave) propagation channel drew tremendous attention world-widely. The power azimuth-elevation spectra of the polarimetric channels are reported, together with the characteristics of the foliage loss, delay spread, angular spread and polarization parameters. The PDXS overlapped with the environments in the real measurement scenario allow to investigate the relationship between XPD at specific direction and the foliage presence status, such as density and blockage level These spectra can be used to compare the amplitude of vertical and horizontal PDXS. Step II, the determined thresholds are applied to extract the dominant portions of the clusters that are larger than the threshold in two PDXSs. Step III, with the information of physical scatterers in the real measurement environments, the distinctions between the two PDXS at specific directions are studied and their relationships with the exact objects in the foliage are analyzed

EXPERIMENTAL RESULTS

MODEL SUMMARY AND COMPARISON TO EXISTING COUNTERPART

CONCLUSION