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Resonant Beam Communications: A New Design Paradigm and Challenges

Yuanming Tian, Dongxu Li, Chuan Huang, Qingwen Liu, Shengli Zhou

TL;DR

RBCom introduces a synchronization-based echo interference elimination scheme for resonant beam communications implemented on a point-to-point distributed laser cavity with retroreflectors. The transceiver design includes dual information-bearing pathways at the transmitter and two corresponding demodulation methods at the receiver within a frame-based structure that embeds synchronization sequences. Comparative analyses against VLC and FOC reveal RBCom delivers higher rates than VLC and better mobility than FOC, while safety and confidentiality are favorable; however, rate improvements over FOC and robust mobile operation remain open challenges. The paper outlines future directions for boosting transmission rate, enabling mobile and multi-user operation, and addressing practical implementation challenges, including device dynamics and frame synchronization across users.

Abstract

Resonant beam communications (RBCom), which adopt oscillating photons between two separate retroreflectors for information transmission, exhibit potential advantages over other types of wireless optical communications (WOC). However, echo interference generated by the modulated beam reflected from the receiver affects the transmission of the desired information. To tackle this challenge, a synchronization-based point-to-point RBCom system is proposed to eliminate the echo interference, and the design for the transmitter and receiver is discussed. Subsequently, the performance of the proposed RBCom is evaluated and compared with that of visible light communications (VLC) and free space optical communications (FOC). Finally, future research directions are outlined and several implementation challenges of RBCom systems are highlighted.

Resonant Beam Communications: A New Design Paradigm and Challenges

TL;DR

RBCom introduces a synchronization-based echo interference elimination scheme for resonant beam communications implemented on a point-to-point distributed laser cavity with retroreflectors. The transceiver design includes dual information-bearing pathways at the transmitter and two corresponding demodulation methods at the receiver within a frame-based structure that embeds synchronization sequences. Comparative analyses against VLC and FOC reveal RBCom delivers higher rates than VLC and better mobility than FOC, while safety and confidentiality are favorable; however, rate improvements over FOC and robust mobile operation remain open challenges. The paper outlines future directions for boosting transmission rate, enabling mobile and multi-user operation, and addressing practical implementation challenges, including device dynamics and frame synchronization across users.

Abstract

Resonant beam communications (RBCom), which adopt oscillating photons between two separate retroreflectors for information transmission, exhibit potential advantages over other types of wireless optical communications (WOC). However, echo interference generated by the modulated beam reflected from the receiver affects the transmission of the desired information. To tackle this challenge, a synchronization-based point-to-point RBCom system is proposed to eliminate the echo interference, and the design for the transmitter and receiver is discussed. Subsequently, the performance of the proposed RBCom is evaluated and compared with that of visible light communications (VLC) and free space optical communications (FOC). Finally, future research directions are outlined and several implementation challenges of RBCom systems are highlighted.
Paper Structure (21 sections, 7 equations, 5 figures, 1 table)

This paper contains 21 sections, 7 equations, 5 figures, 1 table.

Table of Contents

  1. Introduction
  2. A New Design Paradigm
  3. Resonant Beam Creation
  4. Transmitter Design
  5. Direct Modulation Scheme
  6. Adaptive Modulation Scheme
  7. Receiver Design
  8. Direct Modulation Scheme
  9. Adaptive Modulation Scheme
  10. Discussion
  11. Comparisons
  12. Transmission Rate
  13. Mobility
  14. Two-way Communication
  15. Safety
  16. ...and 6 more sections

Figures (5)

  • Figure 1: Proposed framework of point-to-point RBCom system.
  • Figure 2: Direct modulation echo interference elimination at the transmitter and receiver.
  • Figure 3: Comparisons of transmission rates of different WOC technologies.
  • Figure 4: Number of reflection rounds vs. direction angle under different speeds.
  • Figure 5: Basic framework of omnidirectional multiple access RBCom system.