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Ultra-Wideband Double-Directional Channel Measurements and Statistical Modeling in Urban Microcellular Environments for the Upper-Midband/FR3

Naveed A. Abbasi, Kelvin Arana, Siddhant Singh, Atulya Bist, Vikram Vasudevan, Tathagat Pal, Jorge Gomez-Ponce, Young-Han Nam, Charlie Zhang, Andreas F. Molisch

TL;DR

This work conducts the first outdoor UWB double-directional measurements in the FR3 (6–14 GHz) for urban microcells, using an 8 GHz bandwidth system to capture over 25,000 directional PDPs across 60–400 m links. It provides comprehensive statistical modeling of path loss, shadowing, RMS delay spread, and angular spread as functions of distance and frequency, and demonstrates notable differences between omni- and beamformed (Max-Dir) measurements due to directional filtering and vegetation attenuation. Key findings include strong LoS dominance in PDPs, vegetation-induced attenuation in OLoS cases, weak distance dependence of RMSDS, and modest frequency effects on angular spread, with substantial cluster structures in the APS. These results inform FR3 spectrum planning, channel modeling, and the design of next-generation systems, while underscoring the need for broader outdoor FR3 measurement campaigns with more spatial sampling and advanced time-domain sounders.

Abstract

The upper midband, designated as Frequency Range 3 (FR3), is increasingly critical for the next-generation of wireless networks. Channel propagation measurements and their statistical analysis are essential first steps towards this direction. This paper presents a comprehensive ultra-wideband (UWB) double-directional channel measurement campaign in a large portion of FR3 (6-14 GHz) for urban microcellular environments. We analyze over 25,000 directional power delay profiles and providing key insights into line-of-sight (LoS) and obstructed line-of-sight (OLoS) conditions. This is followed by statistical modeling of path loss, shadowing, delay spread and angular spread. As the first UWB double-directional measurement campaign in this frequency range, this work offers critical insights for spectrum allocation, channel modeling, and the design of advanced communication systems, paving the way for further exploration of FR3.

Ultra-Wideband Double-Directional Channel Measurements and Statistical Modeling in Urban Microcellular Environments for the Upper-Midband/FR3

TL;DR

This work conducts the first outdoor UWB double-directional measurements in the FR3 (6–14 GHz) for urban microcells, using an 8 GHz bandwidth system to capture over 25,000 directional PDPs across 60–400 m links. It provides comprehensive statistical modeling of path loss, shadowing, RMS delay spread, and angular spread as functions of distance and frequency, and demonstrates notable differences between omni- and beamformed (Max-Dir) measurements due to directional filtering and vegetation attenuation. Key findings include strong LoS dominance in PDPs, vegetation-induced attenuation in OLoS cases, weak distance dependence of RMSDS, and modest frequency effects on angular spread, with substantial cluster structures in the APS. These results inform FR3 spectrum planning, channel modeling, and the design of next-generation systems, while underscoring the need for broader outdoor FR3 measurement campaigns with more spatial sampling and advanced time-domain sounders.

Abstract

The upper midband, designated as Frequency Range 3 (FR3), is increasingly critical for the next-generation of wireless networks. Channel propagation measurements and their statistical analysis are essential first steps towards this direction. This paper presents a comprehensive ultra-wideband (UWB) double-directional channel measurement campaign in a large portion of FR3 (6-14 GHz) for urban microcellular environments. We analyze over 25,000 directional power delay profiles and providing key insights into line-of-sight (LoS) and obstructed line-of-sight (OLoS) conditions. This is followed by statistical modeling of path loss, shadowing, delay spread and angular spread. As the first UWB double-directional measurement campaign in this frequency range, this work offers critical insights for spectrum allocation, channel modeling, and the design of advanced communication systems, paving the way for further exploration of FR3.
Paper Structure (21 sections, 12 equations, 12 figures, 15 tables)

This paper contains 21 sections, 12 equations, 12 figures, 15 tables.

Table of Contents

  1. Introduction
  2. Motivation
  3. Previous results
  4. Contribution
  5. Organization of paper
  6. Measurement equipment and site
  7. Testbed description
  8. Measurement scenario
  9. Parameters and processing
  10. Data Processing
  11. Parameter Computation
  12. Path Loss and Shadowing
  13. Delay Spread
  14. Angular Spread
  15. Measurement results
  16. ...and 6 more sections

Figures (12)

  • Figure 1: RFoF-based Midband channel measurement setup.
  • Figure 2: Measurement scenario.
  • Figure 3: Elevation pattern for the original horn and modified omni at 6.5GHz.
  • Figure 4: PDP for two sample measurement cases. The symbols (crosses, circles) only serve to distinguish the Max-Dir and omni cases, and do not signify multipath components.
  • Figure 5: Measurement scenario for Rx5.
  • ...and 7 more figures