TY - GEN
T1 - Bias allocation and precoding for tricolor visible light communications with signal-dependent noise
AU - Gaol, Qian
AU - Ekin, Sabit
AU - Qaraqe, Khalid
AU - Serpedin, Erchin
N1 - Publisher Copyright:
© 2019 IEEE.
PY - 2019/11
Y1 - 2019/11
N2 - Wavelength-domain multiplexing enables near parallel transmission for visible light communications (VLC). In this paper, we investigate an optimal bias allocation problem for the tri-color VLC channel when there is no color cross-talk (CoC), and propose a joint precoding and bias allocation algorithm when CoC exists. The optimization problems are formulated considering both lighting and communication requirements. The color constraint is depicted using the MacAdam ellipses on the chromaticity diagram, as an effective relaxation from a fixed point restriction. Also, for practical concerns, the addressed system is affected by signal-dependent noise (SDN). The bias allocation problem under SDN and related constraints is shown to be non-convex, thus a convex-concave procedure is utilized in this paper for convexification. The joint design problem is also non-convex, and an iterative optimization procedure is adopted, where the decoder is of Wiener filter form. Simulation results are given to show the impacts of SDN, CoC, and steps of MacAdam ellipses on system performance.
AB - Wavelength-domain multiplexing enables near parallel transmission for visible light communications (VLC). In this paper, we investigate an optimal bias allocation problem for the tri-color VLC channel when there is no color cross-talk (CoC), and propose a joint precoding and bias allocation algorithm when CoC exists. The optimization problems are formulated considering both lighting and communication requirements. The color constraint is depicted using the MacAdam ellipses on the chromaticity diagram, as an effective relaxation from a fixed point restriction. Also, for practical concerns, the addressed system is affected by signal-dependent noise (SDN). The bias allocation problem under SDN and related constraints is shown to be non-convex, thus a convex-concave procedure is utilized in this paper for convexification. The joint design problem is also non-convex, and an iterative optimization procedure is adopted, where the decoder is of Wiener filter form. Simulation results are given to show the impacts of SDN, CoC, and steps of MacAdam ellipses on system performance.
UR - http://www.scopus.com/inward/record.url?scp=85082973149&partnerID=8YFLogxK
U2 - 10.1109/APCC47188.2019.9026507
DO - 10.1109/APCC47188.2019.9026507
M3 - Conference contribution
AN - SCOPUS:85082973149
T3 - Proceedings of 2019 25th Asia-Pacific Conference on Communications, APCC 2019
SP - 61
EP - 66
BT - Proceedings of 2019 25th Asia-Pacific Conference on Communications, APCC 2019
A2 - Bao, Vo Nguyen Quoc
A2 - Thanh, Tran Thien
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 25th Asia-Pacific Conference on Communications, APCC 2019
Y2 - 6 November 2019 through 8 November 2019
ER -