Beacon-enabled TDMA Ultraviolet Communication Network System Design and Realization

TL;DR

This paper presents a novel NLOS ultraviolet scattering communication network using beacon-enabled TDMA, demonstrating real-time operation with over 110 meters range and 800 kbps throughput, suitable for outdoor optical wireless communication.

Contribution

It introduces a beacon-enabled TDMA scheme for NLOS UV communication, with algorithms and FPGA implementation for real-time outdoor optical wireless networks.

Findings

Achieved over 110 meters transmission range.

System throughput reached 800 kbps.

Demonstrated effective time synchronization and real-time communication.

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.