TY - GEN
T1 - Energy-efficient Modulation for Visible Light SCMA System with Signal-dependent Noise
AU - Hu, Shuping
AU - Gao, Qian
AU - Gong, Chen
AU - Xu, Zhengyuan
AU - Boluda-Ruiz, Ruben
AU - Qaraqe, Khalid
N1 - Publisher Copyright:
© 2018 IEEE.
PY - 2018/9/24
Y1 - 2018/9/24
N2 - In this paper, we investigate the problem of constellation design for a multi-user visible light communication (VLC) system based on sparse code multiple access (SCMA). The design goal is to maximize energy efficiency of the system and at the same time guarantee the lighting constraints, such that the benefit of SCMA to support massive connectivity is fully exploited. With signal-dependent noise (SDN) considered, we conclude that the conventional minimum Euclidean distance (MED) based criterion is far from optimal, based on which we introduce the rotated MED (R-MED) as the optimization objective to mitigate the constellation shape distortion caused by the SDN. A non-convex optimization is establish accordingly, which is relaxed to a convex problem by iterative linearization. Simulation results show that our design leads to non-trivial performance gain over the MED-based designs for systems where power of the SDN is non-negligible.
AB - In this paper, we investigate the problem of constellation design for a multi-user visible light communication (VLC) system based on sparse code multiple access (SCMA). The design goal is to maximize energy efficiency of the system and at the same time guarantee the lighting constraints, such that the benefit of SCMA to support massive connectivity is fully exploited. With signal-dependent noise (SDN) considered, we conclude that the conventional minimum Euclidean distance (MED) based criterion is far from optimal, based on which we introduce the rotated MED (R-MED) as the optimization objective to mitigate the constellation shape distortion caused by the SDN. A non-convex optimization is establish accordingly, which is relaxed to a convex problem by iterative linearization. Simulation results show that our design leads to non-trivial performance gain over the MED-based designs for systems where power of the SDN is non-negligible.
KW - Constellation design
KW - rotated MED
KW - SCMA
KW - signal-dependent noise
KW - visible light communication
UR - http://www.scopus.com/inward/record.url?scp=85055466826&partnerID=8YFLogxK
U2 - 10.1109/CSNDSP.2018.8471873
DO - 10.1109/CSNDSP.2018.8471873
M3 - Conference contribution
AN - SCOPUS:85055466826
T3 - 2018 11th International Symposium on Communication Systems, Networks and Digital Signal Processing, CSNDSP 2018
BT - 2018 11th International Symposium on Communication Systems, Networks and Digital Signal Processing, CSNDSP 2018
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 11th International Symposium on Communication Systems, Networks and Digital Signal Processing, CSNDSP 2018
Y2 - 18 July 2018 through 20 July 2018
ER -