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Enabling Spectrum Coexistence of 5G mmWave and Passive Weather Sensing

By Despoina Kosmopoulou, John Allen Manego, and Mark Moroney

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This Week’s Progress

  • We got a new colleague! (Yay!)
  • Reviewed the literature to clarify the tools and scope of our experiment
  • Started doing tutorials for some of the key tools for our experiment: GNURadio and PAAM (Phased Array Antenna Module)

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Experiment Overview

  • 5G communication band will impact sensing on adjacent satellite weather bands
  • Create a pipeline to measure how much spectral leakage to other channels
  • Radio Frequency Interference(RFI) can have forecasting errors of up to 10 mm in precipitation or a mean absolute error of 12.5%

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Why does this matter?

  • Weather sensing uses the 23.8 GHz band because it is ideal for sensing water vapor, which has a resonance frequency of 22.235 GHz
  • Note the proximity of the n258 band to the 23.8 GHz weather sensing band

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Why does this matter (part 2)

This graphic represents the magnitude response of two different filters on a 5G base station, used to illustrate the power leakage phenomenon and the associated challenges

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Tools: PAAM - (Phased Array Antenna Module)

  • Creates a single high-gain directional beam by using an array of transmitters or receivers
  • This is used to transmit the 5G Signal
  • Followed the Tutorials

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Tools: GNURadio

  • Software Development tool kit used for signal processing block for SDR (software defined radio)
  • Creates flow diagrams to model phenomena in software
  • Followed the Tutorials

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GNURadio OFDM Tutorial

  • Connected to sb2.orbit-lab.org: 2 host nodes (node1-1, node1-2) and 2 USRP X310s
  • Used GUI with ssh in Windows (installed and ran Mobax) and Linux (X11-forwarding)
  • Setup: node1-1: transmitter of OFDM signal, node1-2: receiver

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GNURadio OFDM Tutorial: Results and Concepts

  • Displayed the FT (magnitude) of the signal received and changed some parameters to get familiar with GNURadio

Key ideas revisited:

  • Sampling Theorem and IQ sampling
  • Noise Floor
  • OFDM

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Goals for next week

  • Explore ways to develop and perform experiments free of the bottlenecks of the reservation system
  • Debugging issues found in the tutorials for GNURadio and PAAM
  • Gain further understanding of the PAAM ecosystem
  • Work on experiments regarding sinusoids