Abstract
In
this work, a resource management algorithm is proposed for an indoor
visible light communication (VLC) access network using an orthogonal
frequency division multiple access (OFDMA) scheme. With OFDMA,
adaptive modulation is adopted to improve the frequency spectrum
efficiency of this VLC system. Specifically, the long-term
time-averaged optimization problem is transformed into a series of
single timeslot online problems via a Lyapunov optimization technique.
Then, each user is provided with a separate queue to maintain the
random arrival data by a VLC access point, and a subcarrier allocation
solution is subsequently presented to maximize the transmission rate.
Numerical simulation shows that compared with the best channel state
information (BC) algorithm and round robin (RR) algorithm, the
proposed algorithm can not only ensure the transmission rate but also
greatly improve system stability. In particular, for mean arrival rate
B
=
7
K
b
i
t
s
/
t
i
m
e
s
l
o
t
, the system stability by the proposed
algorithm improves by about 53.36% and 61.36% in comparison with BC
and RR algorithms, respectively. This work will benefit the design and
development of indoor OFDMA VLC systems.
Funder
National Natural Science Foundation of China
Key Research and Development Projects of Shaanxi Province
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering