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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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Updated: Jun 23, 2025

Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
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RIS-Assisted D2D Communication over Nakagami-m Fading with RSMA.

Yunhao Ding1, Linfei Chen2,3, Peishun Yan1

  • 1School of Information Science and Technology, Nantong University, Nantong 226019, China.

Sensors (Basel, Switzerland)
|June 19, 2024
PubMed
Summary

This study enhances reconfigurable intelligent surface (RIS)-assisted device-to-device (D2D) communication reliability using rate-splitting multiple access (RSMA). The proposed system achieves a higher achievable ergodic rate, outperforming existing methods.

Keywords:
Nakagami-m fading channelsachievable ergodic ratemaximum ratio combination (MRC)rate-splitting multiple access (RSMA)reconfigurable intelligent surface (RIS)

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Area of Science:

  • Wireless Communication Systems
  • Signal Processing
  • Information Theory

Background:

  • Device-to-device (D2D) communication offers direct device interaction, enhancing spectral efficiency.
  • Reconfigurable intelligent surfaces (RIS) can intelligently control wireless propagation environments.
  • Nakagami-m fading channels represent a versatile model for wireless channel conditions.

Purpose of the Study:

  • To investigate the performance of RIS-assisted D2D communication systems over Nakagami-m fading channels.
  • To enhance the reliability and achievable ergodic rate of RIS-assisted D2D systems.
  • To apply rate-splitting multiple access (RSMA) for improved system performance.

Main Methods:

  • Utilized rate-splitting multiple access (RSMA) to manage common and private symbols.
  • Analyzed achievable ergodic rates for both RIS and D2D links.
  • Employed maximum ratio combination (MRC) for joint symbol decoding at the destination.

Main Results:

  • Derived a closed-form expression for the achievable ergodic rate.
  • Investigated the impact of power allocation and the number of RIS elements.
  • Demonstrated a close match between analytical and simulation results.

Conclusions:

  • The proposed RIS-assisted D2D system with RSMA significantly improves achievable ergodic rates.
  • System performance is sensitive to power allocation and the number of reflective elements.
  • The approach shows superiority over existing communication system designs.