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Millimeter-Wave Radio Channels vs. Synthetic Beamwidth.

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Narrow beams in millimeter-wave (mmWave) 5G systems significantly reduce multipath components and delay dispersion. Optimized beam orientation can decrease path loss by over 20 dB, enhancing channel performance.

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Area of Science:

  • Wireless communication
  • Electromagnetics
  • Signal processing

Background:

  • Millimeter-wave (mmWave) bands and 5G systems necessitate high-gain, narrow-beam antennas to overcome high path loss.
  • The mmWave radio channel's characteristics are heavily influenced by the beamwidth, orientation, and shape of narrow beams, as multipath components can be excluded.

Purpose of the Study:

  • To propose a procedure for measuring and modeling mmWave radio channels based on synthetic beamwidth.
  • To analyze the impact of narrow beams on channel characteristics like multipath components and delay dispersion.
  • To investigate the effect of beam-center orientation on path loss.

Main Methods:

  • Experimental data collection at 60 GHz in an indoor hallway/lobby environment.
  • Development of a procedure to measure and model radio channels against varying synthetic beamwidths.
  • Analysis of channel parameters including the number of multipath components, delay dispersion, and path loss.

Main Results:

  • Narrow beams significantly reduce the number of multipath components and delay dispersion in the mmWave channel.
  • Optimized beam-center orientation can lead to a path loss reduction exceeding 20 dB.
  • Channel characteristics are demonstrably dependent on beamwidth and orientation.

Conclusions:

  • The study validates the effectiveness of narrow beams in improving mmWave channel performance for 5G.
  • Findings provide crucial insights for 5G mmWave system design, including frequency reuse, antenna and receiver design, equalization, and link budget optimization.
  • The proposed measurement and modeling procedure offers a valuable tool for future mmWave channel characterization.