Abstract

In this paper, we investigate physical-layer security for the indoor single-input single-output (SISO) DC-biased optical orthogonal frequency division multiplexing (DCO-OFDM) visible light communication (VLC) wiretap systems. To increase system security, we propose a precoding scheme using time-domain artificial noise (AN) to exploit the degrees of freedom (DOFs) provided by the cyclic prefix (CP) of OFDM. We further propose a convex optimization method to restrict the increase of peak to average power ratio (PAPR) introduced by AN precoding and then maximize the secrecy rates. Numerical results suggest that the proposed scheme can significantly boost the secrecy performance and alleviate the impact of PAPR increment.

Time domain reshuffling for OFDM based indoor visible light communication systems

Xiaodi You, Jian Chen, Changyuan Yu, and Huanhuan Zheng
Opt. Express 25(10) 11606-11621 (2017)

PAPR reduction based on tone reservation scheme for DCO-OFDM indoor visible light communications

Jurong Bai, Yong Li, Yang Yi, Wei Cheng, and Huimin Du
Opt. Express 25(20) 24630-24638 (2017)

Resource-efficient channel estimation for DCO-OFDM based VLC systems

Zichen Yu, Nuo Huang, Xu Li, Wei Wang, and Chen Gong
Opt. Express 31(17) 27345-27364 (2023)

BICM-ID scheme for clipped DCO-OFDM in visible light communications

Jiandong Tan, Zhaocheng Wang, Qi Wang, and Linglong Dai
Opt. Express 24(5) 4573-4581 (2016)

Improved TKM-TR methods for PAPR reduction of DCO-OFDM visible light communications

Yongqiang Hei, Jiao Liu, Huaxi Gu, Wentao Li, Xiaochuan Xu, and Ray T. Chen
Opt. Express 25(20) 24448-24458 (2017)