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Multipath Effects in Millimetre-Wave Wireless Communication using Orbital Angular Momentum Multiplexing.

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Orbital angular momentum (OAM) multiplexing in millimeter-wave communication can increase capacity. However, higher OAM modes experience significant crosstalk due to multipath effects and beam divergence, impacting system performance.

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Area of Science:

  • Wireless Communication
  • Electromagnetic Wave Propagation
  • Optical Physics

Background:

  • Orbital angular momentum (OAM) beams offer enhanced capacity and spectral efficiency in free-space communication via mode division multiplexing.
  • Conventional wireless links suffer performance degradation from multipath effects caused by beam spreading and reflections.

Purpose of the Study:

  • To analyze and measure multipath effects in a 28 GHz millimeter-wave communication link utilizing OAM multiplexing.
  • To investigate the impact of OAM mode number on intra- and inter-channel crosstalk.

Main Methods:

  • Analysis of multipath effects, including specular reflection from parallel planes.
  • Simulations and experimental measurements of crosstalk in OAM multiplexed millimeter-wave links.
  • Evaluation of OAM beam divergence and receiver filtering effects.

Main Results:

  • Both simulations and experiments demonstrate that higher OAM mode numbers (ℓ) lead to increased intra-channel crosstalk.
  • Higher OAM modes also exhibit stronger inter-channel crosstalk with other OAM channels.
  • Multipath-induced crosstalk is primarily caused by specular reflection parallel to the propagation path.

Conclusions:

  • The observed increase in crosstalk for higher OAM modes is attributed to OAM beam divergence properties.
  • Receiver filtering, related to the spiral wavefront of OAM beams, also contributes to the crosstalk phenomenon.
  • Understanding these multipath effects is crucial for optimizing OAM-based communication systems.