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CSI acquisition in RIS-assisted mobile communication systems.

Yu Han1, Wankai Tang1, Xiao Li1

  • 1National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China.

National Science Review
|July 17, 2023
PubMed
Summary
This summary is machine-generated.

Reconfigurable intelligent surfaces (RIS) offer low-cost mobile communication but face challenges in channel state information (CSI) acquisition. This review overviews existing solutions for efficient CSI acquisition in RIS-assisted systems.

Keywords:
RISchannel estimationhybrid RISimplicit CSI

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Area of Science:

  • Wireless communication systems
  • Electromagnetic wave manipulation
  • Signal processing

Background:

  • Reconfigurable intelligent surfaces (RIS) provide low-cost solutions for mobile communication.
  • Effective channel state information (CSI) acquisition is crucial for optimal RIS performance.
  • Low-cost RIS hardware presents unique challenges for CSI estimation.

Purpose of the Study:

  • To provide a comprehensive overview of existing research on CSI acquisition for RIS-assisted mobile communication.
  • To categorize and analyze different approaches to CSI acquisition in RIS systems.
  • To highlight challenges and future research directions in this domain.

Main Methods:

  • Literature review of recent advancements in RIS-assisted communication.
  • Categorization of CSI acquisition techniques based on architectural and mathematical solutions.
  • Analysis of the trade-offs between different CSI acquisition methods.

Main Results:

  • Identified key architectural improvements for CSI acquisition.
  • Summarized various mathematical algorithms and frameworks for CSI estimation.
  • Highlighted the importance of efficient training and feedback mechanisms.

Conclusions:

  • CSI acquisition remains a critical bottleneck for RIS-based systems.
  • Continued research is needed to develop robust and efficient CSI acquisition techniques.
  • Future work should focus on practical implementation and performance optimization.