  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.
