人工噪声辅助可见光通信保密速率最大化研究

Artificial Noise-Aided Secrecy Rate Maximum of Visible Light Communication

针对均带有多个光敏二极管的窃听者情况,探讨了提高多输入单输出多窃听者(MISOME)可见光通信(VLC)信道的保密性能。设计出一种最佳的人工噪声(AN)辅助传输策略,使得该系统能够在总功率限制和峰值幅度限制的条件下达到保密速率最大。由于该保密速率最大化(SRM)问题的目标函数是非凸函数且难以求解,因此将其转化为一系列单变量的半正定规划(SDP)问题。通过一维搜索方法,SRM问题的最优解可以通过求出一系列SDP问题的最优解来获得。通过仿真结果验证,在总功率为40 dBm时,本文提出的AN辅助方法相较其他方法提升了10%以上的保密性能。

This paper investigated the secure performance of a multiple-input multiple-output visible light communication(VLC)system in the presence of multiple eavesdroppers equipped with multiple photodiodes.An optimal artificial noise(AN)-aided transmission strategy was proposed to maximize the secrecy rate of the VLC system under both the total power and peak amplitude constraints.Since the secrecy rate maximum(SRM)problem was non-convex and hard to solve,it was transformed into a series of single variable semidefinite programming(SDP)problems.Using one-dimensional search,the optimal solution of the SRM problem was obtained by solving a series of SDP problems.The simulation results verify that the performance of the proposed AN-aided method is better than other methods by over 10% at the total power of 40 dBm.