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Beacon-enabled TDMA Ultraviolet Communication Network System Design and Realization

Yuchen Pan, Fei Long, Ping Li, Haotian Shi, Jiazhao Shi, Hanlin Xiao, Chen Gong, Zhengyuan Xu

TL;DR

The paper tackles outdoor NLOS UV scattering communication by implementing a beacon-enabled TDMA network with a master-slave FPGA-based synchronization scheme. It models the UV link as a Poisson counting process and implements beacon transmission, time compensation, and slot transitions to achieve real-time operation. Experimental validation includes lab tests with four nodes and field tests over a 110 m by 90 m area, achieving up to 800 kbps throughput and demonstrating reliable frame delivery despite synchronization challenges and environmental factors. The work advances practical UV-based optical wireless networks suited for daytime operation and misalignment-tolerant links, with quantified synchronization error and guard-interval design to prevent collisions.

Abstract

Nonline of sight (NLOS) ultraviolet (UV) scattering communication can serve as a good candidate for outdoor optical wireless communication (OWC) in the cases of non-perfect transmitter-receiver alignment and radio silence. We design and demonstrate a NLOS UV scattering communication network system in this paper, where a beacon-enabled time division multiple access (TDMA) scheme is adopted. In our system, LED and PMT are employed for transmitter and receiver devices, repectivey. Furthermore, we design algorithms for beacon transmission, beacon reception, time compensation, and time slot transition for hardware realization in field-programmable gate array (FPGA) board based on master-slave structure, where master node periodically transmits beacon signals to slave nodes. Experimental results are provided to evaluate the time synchronization error and specify the system key parameters for real-time implementation. We perform field tests for real-time communication network with the transmission range over 110 multiplied by 90 square meters, where the system throughput reaches 800kbps.

Beacon-enabled TDMA Ultraviolet Communication Network System Design and Realization

TL;DR

The paper tackles outdoor NLOS UV scattering communication by implementing a beacon-enabled TDMA network with a master-slave FPGA-based synchronization scheme. It models the UV link as a Poisson counting process and implements beacon transmission, time compensation, and slot transitions to achieve real-time operation. Experimental validation includes lab tests with four nodes and field tests over a 110 m by 90 m area, achieving up to 800 kbps throughput and demonstrating reliable frame delivery despite synchronization challenges and environmental factors. The work advances practical UV-based optical wireless networks suited for daytime operation and misalignment-tolerant links, with quantified synchronization error and guard-interval design to prevent collisions.

Abstract

Nonline of sight (NLOS) ultraviolet (UV) scattering communication can serve as a good candidate for outdoor optical wireless communication (OWC) in the cases of non-perfect transmitter-receiver alignment and radio silence. We design and demonstrate a NLOS UV scattering communication network system in this paper, where a beacon-enabled time division multiple access (TDMA) scheme is adopted. In our system, LED and PMT are employed for transmitter and receiver devices, repectivey. Furthermore, we design algorithms for beacon transmission, beacon reception, time compensation, and time slot transition for hardware realization in field-programmable gate array (FPGA) board based on master-slave structure, where master node periodically transmits beacon signals to slave nodes. Experimental results are provided to evaluate the time synchronization error and specify the system key parameters for real-time implementation. We perform field tests for real-time communication network with the transmission range over 110 multiplied by 90 square meters, where the system throughput reaches 800kbps.
Paper Structure (16 sections, 8 equations, 17 figures, 2 tables)

This paper contains 16 sections, 8 equations, 17 figures, 2 tables.

Table of Contents

  1. Introduction
  2. Signal Characterization and System Block Diagram
  3. Signal Characterization of UV Communication
  4. Wireless Communication Network System Block Diagram
  5. Digital Processing in Hardware Realization
  6. Beacon Transmission
  7. Time Compensation and Time Slot Transition
  8. Time Delay Analysis
  9. Time Compensation
  10. Time Slot Transition
  11. System Design with Experimental Results
  12. System Specification with Experimental Results
  13. Lab Test on the Communication Network Performance
  14. Transmitter-receiver Field of View (FOV) Test with Experimental Results
  15. Field Test over $110 \times 90 m^2$
  16. ...and 1 more sections

Figures (17)

  • Figure 1: Example of a network topology.
  • Figure 2: The block diagram of NLOS UV Network System.
  • Figure 3: The hardware realization blocks of the NLOS scattering communication network system.
  • Figure 4: Demonstration of three time delays.
  • Figure 5: State transition of the master node and the slave nodes.
  • ...and 12 more figures